PublicRecordCenter.comMine Map Alert, a public service
Public alert, October 2026

Is an old mine under your street?

41,352 old mine sites and mapped mine openings from two federal files, placed inside the limits of 6,284 American towns and 3,048 counties, with the office in every state that holds the mine maps. Free, no login, every source official.

Please read: Everything here can be wrong. This is information, not a guarantee: the two federal files can be wrong, incomplete or out of date, the boundaries and the geocoder can be wrong, a point is a location and not a property line, and nothing on this page says that a mine is or is not under any particular property. Do not buy, sell, move, or make any decision about a home or about your safety on this alone. Ask the state mine map office named here for the maps, and have a qualified engineer look at the ground.

Photo: James St. John, CC BY 2.0, via Wikimedia Commons
666,422old mine sites and mapped mine features inside counties
97,333shafts, adits and tunnels mapped from the historical sheets
6,284towns and cities with workings inside their own limits
51states and DC with the office that holds the mine maps named
The map

Every county, on one map

Each circle is one county, sized and coloured by how many records the two federal files hold there: worked out or abandoned mine sites from the USGS mineral file, and shafts, adits, pits and mines from the historical topographic sheets. Click a circle to open that county page.

Open the national map
The method

How to find out whether a working is under a property

A mine point in the federal file is a location, not a property line. The record that answers the question is the mine map: the survey the operator filed, showing the rooms, the shafts and the pillars. Those maps sit with the state mining agency and, for coal, with the federal repository.

  1. Start with the state mine map office below. Several states publish an online viewer keyed to a county, a quadrangle or an address.
  2. Ask the state abandoned mine land programme about subsidence, an open shaft or a mine fire. Reporting one is free and the programme is funded to deal with it.
  3. For coal, request the maps from the OSMRE National Mine Map Repository, which holds the filed underground mine maps for the whole country.
  4. Where the state runs mine subsidence insurance, a standard homeowner policy does not cover the damage and that programme is the only cover.
Town by town

The towns with the most old workings inside their own limits

Both federal files carry a position for each record. Crossed with the Census town boundaries, 41,352 old mine sites and mapped mine features fall inside the limits of a town or city, and 666,422 inside a county. These are the sixty towns with the most, each one linking its own records page, drawn inside its own boundary.

Joplin, Missouri: old mine sites and mapped mine features inside the town limitsJoplin, Missouri593 old mine sites and 283 mapped features inside the limitsMojave, California: old mine sites and mapped mine features inside the town limitsMojave, California39 old mine sites and 645 mapped features inside the limitsBouse, Arizona: old mine sites and mapped mine features inside the town limitsBouse, Arizona64 old mine sites and 335 mapped features inside the limitsTonopah, Nevada: old mine sites and mapped mine features inside the town limitsTonopah, Nevada44 old mine sites and 322 mapped features inside the limitsRosamond, California: old mine sites and mapped mine features inside the town limitsRosamond, California21 old mine sites and 272 mapped features inside the limitsFernley, Nevada: old mine sites and mapped mine features inside the town limitsFernley, Nevada12 old mine sites and 275 mapped features inside the limitsBlack Hawk, Colorado: old mine sites and mapped mine features inside the town limitsBlack Hawk, Colorado18 old mine sites and 259 mapped features inside the limitsIron River, Michigan: old mine sites and mapped mine features inside the town limitsIron River, Michigan220 old mine sites and 23 mapped features inside the limitsLas Vegas, Nevada: old mine sites and mapped mine features inside the town limitsLas Vegas, Nevada1 old mine sites and 235 mapped features inside the limitsHenderson, Nevada: old mine sites and mapped mine features inside the town limitsHenderson, Nevada13 old mine sites and 223 mapped features inside the limitsBenton, California: old mine sites and mapped mine features inside the town limitsBenton, California23 old mine sites and 212 mapped features inside the limitsCasa Grande, Arizona: old mine sites and mapped mine features inside the town limitsCasa Grande, Arizona13 old mine sites and 219 mapped features inside the limitsHibbing, Minnesota: old mine sites and mapped mine features inside the town limitsHibbing, Minnesota169 old mine sites and 60 mapped features inside the limitsGranby, Missouri: old mine sites and mapped mine features inside the town limitsGranby, Missouri218 old mine sites and 0 mapped features inside the limitsYerington, Nevada: old mine sites and mapped mine features inside the town limitsYerington, Nevada11 old mine sites and 187 mapped features inside the limitsPhoenix, Arizona: old mine sites and mapped mine features inside the town limitsPhoenix, Arizona56 old mine sites and 138 mapped features inside the limitsEster, Alaska: old mine sites and mapped mine features inside the town limitsEster, Alaska119 old mine sites and 69 mapped features inside the limitsSan Antonio, Texas: old mine sites and mapped mine features inside the town limitsSan Antonio, Texas4 old mine sites and 176 mapped features inside the limitsAmargosa Valley, Nevada: old mine sites and mapped mine features inside the town limitsAmargosa Valley, Nevada2 old mine sites and 175 mapped features inside the limitsClancy, Montana: old mine sites and mapped mine features inside the town limitsClancy, Montana50 old mine sites and 125 mapped features inside the limitsAlta, Utah: old mine sites and mapped mine features inside the town limitsAlta, Utah30 old mine sites and 137 mapped features inside the limitsJohannesburg, California: old mine sites and mapped mine features inside the town limitsJohannesburg, California23 old mine sites and 143 mapped features inside the limitsTucson, Arizona: old mine sites and mapped mine features inside the town limitsTucson, Arizona26 old mine sites and 128 mapped features inside the limitsIdaho Springs, Colorado: old mine sites and mapped mine features inside the town limitsIdaho Springs, Colorado121 old mine sites and 31 mapped features inside the limitsGrass Valley, California: old mine sites and mapped mine features inside the town limitsGrass Valley, California138 old mine sites and 10 mapped features inside the limitsAurora, Missouri: old mine sites and mapped mine features inside the town limitsAurora, Missouri145 old mine sites and 0 mapped features inside the limitsPikeville, Kentucky: old mine sites and mapped mine features inside the town limitsPikeville, Kentucky0 old mine sites and 142 mapped features inside the limitsAjo, Arizona: old mine sites and mapped mine features inside the town limitsAjo, Arizona9 old mine sites and 117 mapped features inside the limitsKnoxville, Tennessee: old mine sites and mapped mine features inside the town limitsKnoxville, Tennessee68 old mine sites and 54 mapped features inside the limitsLake Isabella, California: old mine sites and mapped mine features inside the town limitsLake Isabella, California20 old mine sites and 100 mapped features inside the limitsSan Jose, California: old mine sites and mapped mine features inside the town limitsSan Jose, California46 old mine sites and 73 mapped features inside the limitsBuckeye, Arizona: old mine sites and mapped mine features inside the town limitsBuckeye, Arizona21 old mine sites and 95 mapped features inside the limitsArivaca, Arizona: old mine sites and mapped mine features inside the town limitsArivaca, Arizona69 old mine sites and 46 mapped features inside the limitsValdez, Alaska: old mine sites and mapped mine features inside the town limitsValdez, Alaska88 old mine sites and 25 mapped features inside the limitsSearchlight, Nevada: old mine sites and mapped mine features inside the town limitsSearchlight, Nevada13 old mine sites and 98 mapped features inside the limitsReno, Nevada: old mine sites and mapped mine features inside the town limitsReno, Nevada21 old mine sites and 89 mapped features inside the limitsHanover, New Mexico: old mine sites and mapped mine features inside the town limitsHanover, New Mexico6 old mine sites and 95 mapped features inside the limitsWillow, Alaska: old mine sites and mapped mine features inside the town limitsWillow, Alaska70 old mine sites and 30 mapped features inside the limitsMeadview, Arizona: old mine sites and mapped mine features inside the town limitsMeadview, Arizona10 old mine sites and 90 mapped features inside the limitsWaco, Texas: old mine sites and mapped mine features inside the town limitsWaco, Texas2 old mine sites and 95 mapped features inside the limitsDuenweg, Missouri: old mine sites and mapped mine features inside the town limitsDuenweg, Missouri65 old mine sites and 32 mapped features inside the limitsAlbuquerque, New Mexico: old mine sites and mapped mine features inside the town limitsAlbuquerque, New Mexico3 old mine sites and 94 mapped features inside the limitsCave Creek, Arizona: old mine sites and mapped mine features inside the town limitsCave Creek, Arizona17 old mine sites and 78 mapped features inside the limitsBeatty, Nevada: old mine sites and mapped mine features inside the town limitsBeatty, Nevada14 old mine sites and 77 mapped features inside the limitsJulian, California: old mine sites and mapped mine features inside the town limitsJulian, California36 old mine sites and 54 mapped features inside the limitsGroveland, California: old mine sites and mapped mine features inside the town limitsGroveland, California49 old mine sites and 41 mapped features inside the limitsRail Road Flat, California: old mine sites and mapped mine features inside the town limitsRail Road Flat, California74 old mine sites and 14 mapped features inside the limitsPeoria, Arizona: old mine sites and mapped mine features inside the town limitsPeoria, Arizona23 old mine sites and 60 mapped features inside the limitsBirmingham, Alabama: old mine sites and mapped mine features inside the town limitsBirmingham, Alabama32 old mine sites and 51 mapped features inside the limitsGeorgetown, California: old mine sites and mapped mine features inside the town limitsGeorgetown, California73 old mine sites and 9 mapped features inside the limitsCoalfield, Tennessee: old mine sites and mapped mine features inside the town limitsCoalfield, Tennessee0 old mine sites and 82 mapped features inside the limitsCarterville, Missouri: old mine sites and mapped mine features inside the town limitsCarterville, Missouri73 old mine sites and 9 mapped features inside the limitsEly, Nevada: old mine sites and mapped mine features inside the town limitsEly, Nevada4 old mine sites and 77 mapped features inside the limitsDayton, Nevada: old mine sites and mapped mine features inside the town limitsDayton, Nevada13 old mine sites and 68 mapped features inside the limitsNashwauk, Minnesota: old mine sites and mapped mine features inside the town limitsNashwauk, Minnesota61 old mine sites and 19 mapped features inside the limitsMemphis, Tennessee: old mine sites and mapped mine features inside the town limitsMemphis, Tennessee28 old mine sites and 51 mapped features inside the limitsCrystal Falls, Michigan: old mine sites and mapped mine features inside the town limitsCrystal Falls, Michigan75 old mine sites and 4 mapped features inside the limitsCartersville, Georgia: old mine sites and mapped mine features inside the town limitsCartersville, Georgia78 old mine sites and 1 mapped features inside the limitsIrwindale, California: old mine sites and mapped mine features inside the town limitsIrwindale, California42 old mine sites and 34 mapped features inside the limitsPortland, Oregon: old mine sites and mapped mine features inside the town limitsPortland, Oregon61 old mine sites and 14 mapped features inside the limits

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In pictures

What it looks like when the ground gives way

Every photograph here is a federal public domain work or a file its author released for reuse, and each caption links the page that says so. The two mine maps are scans from the National Archives: the record that shows what runs under a parcel, and the reason the state offices above matter.

Route 61 near Centralia buckled and cracked by the underground coal fire, seen in fall 2000 with geology students for scale.
Route 61 near Centralia buckled and cracked by the underground coal fire, seen in fall 2000 with geology students for scale. (Centralia, Pennsylvania, 2000)Photo: James St. John, CC BY 2.0, via Wikimedia Commons
The ground burning at the surface over the Centralia underground coal fire.
The ground burning at the surface over the Centralia underground coal fire. (Centralia, Pennsylvania)Photo: James St. John, CC BY 2.0, via Wikimedia Commons
The cave-in and sinkhole beside the mine buildings at the Treadwell Mine on Douglas Island, Alaska, after the workings flooded in 1917.
The cave-in and sinkhole beside the mine buildings at the Treadwell Mine on Douglas Island, Alaska, after the workings flooded in 1917. (Douglas Island, Alaska, 1917)Photo: University of Washington Libraries, Alaska, Western Canada and United States Collection, public domain
First level workings of the Chickaloon coal mine in Alaska, a scanned underground mine map held by the National Archives.
First level workings of the Chickaloon coal mine in Alaska, a scanned underground mine map held by the National Archives. (Chickaloon, Alaska, 1916 to 1922)Map: National Archives and Records Administration, identifier 60030978, public domain
An abandoned anthracite mine near Scranton, Pennsylvania, with prop timbers holding up the roof, from a stereoscopic view published between about 1870 and 1915.
An abandoned anthracite mine near Scranton, Pennsylvania, with prop timbers holding up the roof, from a stereoscopic view published between about 1870 and 1915. (Scranton, Pennsylvania)Image: New York Public Library, Robert N. Dennis collection of stereoscopic views, public domain
An abandoned coal mine in Garrett County, Maryland, photographed by Theodor Jung for the Resettlement Administration in September 1935.
An abandoned coal mine in Garrett County, Maryland, photographed by Theodor Jung for the Resettlement Administration in September 1935. (Garrett County, Maryland, 1935)Library of Congress, Prints and Photographs Division, FSA/OWI Black-and-White Negatives, photo by Theodor Jung
An abandoned mine shaft in the Alabama Hills, California, near the contact of the Alabama Hills Granite with metamorphic wall rock.
An abandoned mine shaft in the Alabama Hills, California, near the contact of the Alabama Hills Granite with metamorphic wall rock. (Alabama Hills, California)Credit: U.S. Geological Survey
An open mine shaft half covered by wooden boards in Joshua Tree National Park, the kind that may drop straight down a hundred feet or more.
An open mine shaft half covered by wooden boards in Joshua Tree National Park, the kind that may drop straight down a hundred feet or more. (Joshua Tree National Park, California)NPS / Stacy Manson
Steam and smoke rising from the ground in Centralia in December 2006.
Steam and smoke rising from the ground in Centralia in December 2006. (Centralia, Pennsylvania, 2006)Photo: Scott Drzyzga, CC BY 2.0, via Wikimedia Commons
Aerial view of a grate installed over the top of an abandoned mine shaft in Nevada.
Aerial view of a grate installed over the top of an abandoned mine shaft in Nevada. (Nevada, 2014)Photo: Bureau of Land Management Nevada, public domain
The Bailey Day abandoned mine site in Nevada before treatment.
The Bailey Day abandoned mine site in Nevada before treatment. (Nevada, 2014)Photo: Bureau of Land Management Nevada, public domain
The Bailey Day abandoned mine site in Nevada after earthworks, with the ground reseeded in November 2014.
The Bailey Day abandoned mine site in Nevada after earthworks, with the ground reseeded in November 2014. (Nevada, 2014)Photo: Bureau of Land Management Nevada, public domain
Heavy earthmoving equipment during reclamation of the abandoned Horse Creek coal mine near Pinckneyville, Illinois, with a bulldozer in the foreground and dump trucks working in the excavation behind it.
Heavy earthmoving equipment during reclamation of the abandoned Horse Creek coal mine near Pinckneyville, Illinois, with a bulldozer in the foreground and dump trucks working in the excavation behind it. (Pinckneyville, Illinois, 2005)Photo: Tami Heilemann, U.S. Department of the Interior, via the National Archives, public domain
A small part of the Centralia mine fire as it appeared after being exposed during an excavation in 1969.
A small part of the Centralia mine fire as it appeared after being exposed during an excavation in 1969. (Centralia, Pennsylvania, 1969)Photo: U.S. Bureau of Mines, public domain
The Eska Creek coal mine leasing unit number 7 in Alaska, a scanned Alaskan Engineering Commission mine map held by the National Archives.
The Eska Creek coal mine leasing unit number 7 in Alaska, a scanned Alaskan Engineering Commission mine map held by the National Archives. (Eska Creek, Alaska, 1916 to 1922)Map: National Archives and Records Administration, identifier 60089625, public domain
NASA ASTER satellite image of the Centralia area acquired August 24, 2003, with open pit coal mines dotting the landscape for miles around.
NASA ASTER satellite image of the Centralia area acquired August 24, 2003, with open pit coal mines dotting the landscape for miles around. (Centralia, Pennsylvania, 2003)Image: NASA/METI/AIST/Japan Space Systems and the U.S./Japan ASTER Science Team, public domain
Cracked and heaved pavement of Route 61 near Centralia over the underground coal fire in summer 2006.
Cracked and heaved pavement of Route 61 near Centralia over the underground coal fire in summer 2006. (Centralia, Pennsylvania, 2006)Photo: James St. John, CC BY 2.0, via Wikimedia Commons
A gas vent where fumes from the Centralia underground coal fire reach the surface.
A gas vent where fumes from the Centralia underground coal fire reach the surface. (Centralia, Pennsylvania)Photo: James St. John, CC BY 2.0, via Wikimedia Commons
The interception trench dug to stop the Centralia underground coal fire, which failed to contain it, seen in summer 2006.
The interception trench dug to stop the Centralia underground coal fire, which failed to contain it, seen in summer 2006. (Centralia, Pennsylvania, 2006)Photo: James St. John, CC BY 2.0, via Wikimedia Commons
The Pennsylvania DEP warning sign at the start of Route 61 in Centralia: underground mine fire, dangerous gases, ground prone to sudden collapse.
The Pennsylvania DEP warning sign at the start of Route 61 in Centralia: underground mine fire, dangerous gases, ground prone to sudden collapse. (Centralia, Pennsylvania, 2006)Photo: JohnDS, released to the public domain, via Wikimedia Commons
A cupola gate installed over an abandoned mine at the Gum Tree Site in Kern County, California, on land managed by the BLM Ridgecrest Field Office.
A cupola gate installed over an abandoned mine at the Gum Tree Site in Kern County, California, on land managed by the BLM Ridgecrest Field Office. (Kern County, California, 2016)Photo: Bureau of Land Management, public domain
An abandoned mine opening in Wyoming inventoried by the BLM and Bat Conservation International.
An abandoned mine opening in Wyoming inventoried by the BLM and Bat Conservation International. (Wyoming, 2018)Photo: Bureau of Land Management, public domain
A bat gate across the entrance to the Greeley Mine in Vermont.
A bat gate across the entrance to the Greeley Mine in Vermont. (Vermont, 2009)Photo: Marvin Moriarty, U.S. Fish and Wildlife Service, public domain
The Sunset uranium mine in Wyoming during reclamation of its highwalls, pits, open shafts and spoil piles.
The Sunset uranium mine in Wyoming during reclamation of its highwalls, pits, open shafts and spoil piles. (Wyoming, 2003)Photo: U.S. Department of the Interior, public domain
An open abandoned mine shaft at Phantom Falls.
An open abandoned mine shaft at Phantom Falls.Photo: Podruznik, released to the public domain, via Wikimedia Commons
An exposed shaft and mine dump at an abandoned mine outside Boulder, Montana.
An exposed shaft and mine dump at an abandoned mine outside Boulder, Montana. (Boulder, Montana)Credit: U.S. Geological Survey
An abandoned mine shaft in the Mojave Basin and Range Ecoregion of Nevada, photographed in August 2002.
An abandoned mine shaft in the Mojave Basin and Range Ecoregion of Nevada, photographed in August 2002. (Nevada, 2002)Credit: U.S. Geological Survey
Abandoned tunnels in bedrock at the Elizabeth Mine in Strafford, Vermont, a copper mine abandoned in 1957 and placed on the Superfund National Priority List in 2001.
Abandoned tunnels in bedrock at the Elizabeth Mine in Strafford, Vermont, a copper mine abandoned in 1957 and placed on the Superfund National Priority List in 2001. (Strafford, Vermont)Credit: U.S. Geological Survey
An abandoned mine site on Galena Creek in the Barker mining district of central Montana, a source of toxic metals in the stream below.
An abandoned mine site on Galena Creek in the Barker mining district of central Montana, a source of toxic metals in the stream below. (Barker mining district, Montana)Credit: U.S. Geological Survey
A mine opening in Joshua Tree National Park sealed with a custom wildlife gate that lets bats, tortoises and other wildlife pass.
A mine opening in Joshua Tree National Park sealed with a custom wildlife gate that lets bats, tortoises and other wildlife pass. (Joshua Tree National Park, California)NPS / Stacy Manson
Wire fencing and a warning sign closing an abandoned mine site in Saguaro National Park, Arizona.
Wire fencing and a warning sign closing an abandoned mine site in Saguaro National Park, Arizona. (Saguaro National Park, Arizona)NPS photo

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Safety

If the ground opens: who to call, and when it is 911

A hole that opens over an old working is a mine subsidence. What to do depends on whether anyone is in danger right now.

Call 911 first when any of this is true

  • A person, a child or an animal has fallen in, or could fall in before help arrives.
  • A hole has opened in a road, a pavement, a school yard or anywhere the public walks or drives.
  • A building is moving, cracking fast, or its gas or water line has broken.
  • You smell gas, or smoke or steam is coming out of the ground, which can mean a mine fire underneath.
  • Anyone has gone into an opening. Air in an old working can kill in a minute and rescue is for trained teams only.

Keep people and vehicles well back from the edge. Subsidence holes widen, and the ground around one is already undermined.

Not an emergency: call the state abandoned mine land programme

A new crack or dip in the ground, a shaft or an opening found on land, a hole that is fenced and stable, water or orange drainage coming out of an old working: these go to the state programme, which is funded by federal coal fees to deal with exactly this and does not charge the landowner for an emergency closure. Pennsylvania takes after hours reports on 800-541-2050 and runs district offices in Ebensburg and Wilkes-Barre. Wyoming tells people to telephone its abandoned mine land division on 1-800-510-0283 to learn whether a property sits over a mined area.

If your house is already damaged

Photograph everything with dates before anything is repaired, and write down when the movement started. A standard homeowner policy does not cover mine subsidence. Eight states run a separate programme, and in Ohio the cover is added to every homeowner policy for a dollar a year in twenty six counties, with the claim going through your own insurance agent. Where no programme exists, the state abandoned mine land office is still the body that records the subsidence.

On federal land

An open shaft or adit on Bureau of Land Management or Forest Service ground is reported to that office. Do not enter it and do not let a dog near the opening.

The state office to call

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State offices

The office that holds the mine maps, state by state

Every office below was opened from this server before it was listed, or confirmed in the search index where the host refuses us. Twenty four states publish a mine map collection or a viewer, twenty eight run an abandoned mine land programme, and eight run mine subsidence insurance. Where a state has none, it says so.

Alabama

Underground coal mine maps for Alabama are held by the Alabama Department of Labor's Mine Safety office in Birmingham, reached at (205) 944-1075. Subsidence, open shafts and other hazards from coal mining before 1977 are handled by the department's Abandoned Mine Land Reclamation program, which keeps the state inventory of priority sites. A homeowner with a question about a specific property calls the Mine Safety office and asks whether a mapped underground mine lies under the parcel.

The Geological Survey of Alabama coal page is a script application that gives this box no readable text, so it is not listed.

Alaska

Alaska's Abandoned Mine Lands program sits in the Department of Natural Resources Division of Mining, Land and Water and covers historic mines of any type. The Division of Geological and Geophysical Surveys publishes the state's mineral maps and data. Alaska publishes no mine map lookup for a single address, so a property question goes to the Division of Mining, Land and Water.

Arizona

The Arizona Geological Survey keeps the former Department of Mines and Mineral Resources archive of thousands of original mine files, photographs and maps, served through its mining data site. Open shafts and other abandoned mine hazards are reported to the Arizona State Mine Inspector, whose abandoned mines office inventories and secures them. A homeowner checks a property by searching the survey's mine files for the district and mine name and asks the State Mine Inspector about known openings nearby.

Arkansas

The Arkansas Division of Environmental Quality Coal Program in Fort Smith inspects coal mines and reclaims those abandoned before 1977 with federal funds. The Arkansas Geological Survey's mineral commodity web map shows mines and mine symbols from topographic maps for all 75 counties. Arkansas publishes no underground mine map viewer, so a property question goes to the Coal Program office.

California

The Department of Conservation's Abandoned Mine Lands Unit records tens of thousands of abandoned mines in all 58 counties, about two thirds of them on federal land. The department's map server carries the Division of Mine Reclamation mine status data and the California Geological Survey mineral land classification maps. California publishes no underground workings viewer for a street address, so a homeowner starts with the map server and the Abandoned Mine Lands Unit.

Colorado

The Division of Reclamation, Mining and Safety keeps the coal and mineral permit files and the Historical Mining Books in its electronic document system, with records of sites released before 2002 at the Colorado State Archives. Its Inactive Mine Reclamation Program answers subsidence emergencies at 1-800-44MINES or 303-866-3567, and its Mine Subsidence Protection Program pays for coal mine subsidence damage to Colorado homes. The Colorado Geological Survey's ground subsidence page covers the hazard over abandoned workings and lists its county studies.

Colorado's cover is a protection program run by DRMS, not an insurance policy sold by insurers.

Connecticut

The Connecticut Geological Survey in DEEP keeps the Connecticut Bedrock Mining Sites Database, an inventory of active and historic bedrock mines and quarries with a web map. Connecticut has no abandoned mine land program and no coal workings. A property question starts with the mining sites database.

Delaware

Delaware has quarries and sand pits but no underground mines and no abandoned mine program. The Delaware Geological Survey is the state source for geology questions.

Delaware has no mines beyond quarries and sand pits and no abandoned mine program.

District of Columbia

The District of Columbia has no mines and no mine program. The federal National Mine Map Repository and the USGS mine feature data are the only records that touch the District.

No mines and no mine program.

This state publishes no mine map collection and no abandoned mine land programme of its own. The federal sources at the top of this page are the ones to use.

Florida

Florida's mines are surface phosphate, limestone, heavy mineral and peat operations regulated by the Department of Environmental Protection Mining and Mitigation Program. There are no underground mines, and ground collapse in Florida is karst sinkhole activity rather than mine subsidence.

Florida sinkholes are karst, not mine subsidence.

Georgia

Georgia's Environmental Protection Division Surface Mining Unit permits and bonds surface mines and publishes the list of permitted facilities. The old Georgia Geologic Survey mineral resource maps are posted by the division. Georgia publishes no abandoned mine inventory online.

Georgia publishes no abandoned mine inventory; the Dahlonega gold mines are not mapped by the state online.

Hawaii

Hawaii has quarries only and no abandoned mine program. No state page on abandoned mines exists.

No state page on abandoned mines exists; Hawaii has quarries only.

This state publishes no mine map collection and no abandoned mine land programme of its own. The federal sources at the top of this page are the ones to use.

Idaho

The Idaho Geological Survey's Mines and Prospects Database lists the state's mines and prospects with mine histories, inactive mines and mineral property files, shown on the survey's interactive map. The Idaho Department of Lands runs the Abandoned Mine Lands program under the 1994 Abandoned Mine Reclamation Act and refers location questions to its nearest supervisory area. A homeowner checks a property by searching the survey's database and map for mines near the parcel.

Illinois

The Illinois State Geological Survey's Coal Mines in Illinois Viewer (ILMINES) shows known underground and surface coal mines, underground industrial mines and an underground mine proximity area, built to tell a homeowner how close the workings are. The Illinois DNR Abandoned Mine Lands Reclamation Division in Springfield investigates subsidence, and its homeowner guide explains pit and sag subsidence over the more than 800,000 acres undermined for coal. Subsidence cover is bought through the homeowner's own insurer, which is backed by the Illinois Mine Subsidence Insurance Fund created by statute.

The Illinois Mine Subsidence Insurance Fund is a not for profit created by statute, not a state agency; the cover is bought through the homeowner insurer.

Indiana

The Indiana DNR Division of Reclamation's Coal Mine Information System map, built with the Indiana Geological Survey, shows every documented surface and underground coal mine in the state. Hazards from legacy mining are reported to the division at 812-665-2207 or AbandonedMinesRestoration@dnr.IN.gov. The Indiana Department of Insurance runs the Mine Subsidence Insurance Fund for 26 southwestern counties, with cover up to $500,000 per structure added to a property policy through the owner's agent.

The DNR subsidence insurance page (https://www.in.gov/dnr/reclamation/mine-subsidence/subsidence-insurance/) says the Division of Reclamation fills subsidence holes but does not pay for structural damage, which is what the fund is for.

Iowa

The Iowa DNR Iowa Coal Mines map shows known historic coal mine sites with an address search and links to the mine maps and mine records, which came from the Office of State Mine Inspectors (1884 to 1973) through the Iowa Geological Survey. Abandoned coal mine land is reclaimed by the Iowa Department of Agriculture and Land Stewardship Mines and Minerals Bureau, mostly in southeast Iowa. A homeowner types the address into the coal mines map to see any mine recorded near the parcel.

Coal was mined in Iowa from the 1840s to 1994.

Kansas

The Kansas Department of Health and Environment Abandoned Mine Land Program in the Surface Mining Unit handles coal mine hazards and runs an emergency program for sudden collapses. The Kansas Geological Survey keeps the archive of 150 years of coal mining, including underground mines to 700 feet in Cherokee and Crawford Counties, to help locate former mining areas when land changes use. A property question goes to the survey's coal section or the KDHE program.

Underground coal mining in Kansas was concentrated in Cherokee and Crawford Counties.

Kentucky

The Kentucky Mine Mapping Information System lets a person search mines and maps, view interactive maps and download final maps and maps from 2004 on, with older maps requested from EEC.KORA@ky.gov. The Division of Mine Safety's Mine Map Repository holds more than 175,000 paper coal mine maps and 183,000 mine records, viewed by appointment at (502) 782-6307. Mine hazards are reported to the Division of Abandoned Mine Lands, emergency line 1 (877) 495-9552, and residents of 37 counties can buy coal mine subsidence cover through the Kentucky Mine Subsidence Insurance Fund at the Department of Insurance.

Louisiana

Louisiana's underground mines are salt mines and the state publishes no abandoned mine inventory. The Louisiana Geological Survey at LSU is the statutory state survey.

Louisiana's underground mines are salt mines; no state abandoned mine inventory is published.

Maine

The Maine Geological Survey's Maine Mineral Resources database and interactive map list mineral occurrences, prospects, significant deposits and historical mines by town and commodity, with a CSV download. Maine has no abandoned mine land program. A property question starts with the survey's map.

Maryland

The Maryland Department of the Environment keeps an online repository of historic underground coal mines, built with Maryland Environmental Services, the State Archives and Frostburg State University and opened through its Deep Mine Mapping Application, with Ryan Streett at 410-537-3883 as the contact. The MDE Abandoned Mine Lands Division reclaims pre 1977 coal mine land in Allegany and Garrett Counties, the only coal counties in the state. A homeowner in western Maryland opens the Deep Mine Mapping Application and looks for workings under the parcel.

Maryland's coal mining is confined to Allegany and Garrett Counties.

Massachusetts

The Massachusetts Geological Survey at UMass Amherst publishes mineral resources pages and map databases but no abandoned mine inventory. Massachusetts has no abandoned mine land program.

No abandoned mine inventory is published; the survey's host does not answer this box, both urls are in the search index.

Michigan

EGLE's GeoWebFace map shows sites associated with permitted and historic mining along with wells, with links into the division's files. Michigan publishes no agency map of underground workings and has no coal abandoned mine land program. A homeowner in the iron and copper districts of the Upper Peninsula starts with GeoWebFace and the OSMRE National Mine Map Repository.

GeoWebFace shows historic mining sites as points; no agency page with underground workings outlines was found, and the OSMRE National Mine Map Repository holds Michigan maps.

Minnesota

The Minnesota DNR Underground Mine Mapping Project is a GIS of the documented underground iron mine features on the Mesabi Range, built from more than 3,000 scanned mine maps gathered from the DNR, the Iron Range Research Center, the St. Louis County Inspector of Mines and the mining companies. Detailed questions go to the DNR Lands and Minerals office in Hibbing at 218-231-8484. Minnesota has no coal mining and no coal abandoned mine land program.

Minnesota has no coal AML program; its underground mines are iron mines on the Mesabi Range.

Mississippi

The MDEQ Office of Geology Mining and Reclamation Division regulates surface mines of sand, gravel, clay, bentonite, chalk and limestone, with a county by county mines viewer. The office states that there are no underground mines in Mississippi.

The state says it has no underground mines.

Missouri

The Missouri Geological Survey is the official Missouri Mine Map Repository under section 256.112 RSMo, with more than 2,000 underground mine maps, 1,193 of them scanned, listed by number and by township, range and section so a location can be searched, and reached at 573-368-2100. The DNR Land Reclamation Program runs the abandoned mine land program approved in 1982, and its Abandoned Mine Lands Viewer maps completed coal, lead and zinc reclamation projects. A homeowner finds the parcel's legal description, checks the repository's legal description list and downloads any map that covers it.

Montana

The Montana Bureau of Mines and Geology Mining Archives hold thousands of mining maps and files for Montana properties collected since 1919, with a database search, and the bureau keeps the inventory of abandoned and inactive mines made with the Forest Service and BLM. The Montana DEQ Abandoned Mine Lands program monitors and reclaims abandoned coal and hard rock mines and lists its project managers' phone numbers. A property question starts with the bureau's archive search.

Nebraska

Nebraska has no abandoned mine program. The Conservation and Survey Division of the University of Nebraska is the state survey and publishes the mineral resources pages.

Nevada

The Nevada Bureau of Mines and Geology Digital Library holds the mining district files, engineering files, exploration reports and mineral land assessments, browsable by county and mining district. Dangerous abandoned openings are reported to the Nevada Division of Minerals Abandoned Mine Lands program, Sean Derby, 775-684-7047, which ranks and secures them. A homeowner looks up the mining district in the bureau's library and asks the Division of Minerals about known hazards near the parcel.

New Hampshire

The New Hampshire Geological Survey in the Department of Environmental Services publishes the state's geology pages but no abandoned mine inventory. New Hampshire has no abandoned mine land program.

No abandoned mine inventory is published.

New Jersey

The New Jersey Geological and Water Survey runs the Mine Hazard and Resources Program for the abandoned iron mine openings of the Highlands and keeps the New Jersey Abandoned Mines Map Archive of historical mine maps. New Jersey has no coal abandoned mine land program. A homeowner in the Highlands checks the map archive for the mine nearest the parcel and asks the survey program about known openings.

New Mexico

The New Mexico Bureau of Geology's New Mexico Mines Database records mines, districts, deposits, occurrences and mills collected since 1927 and is used to identify hazardous mine openings. The EMNRD Mining and Minerals Division Abandoned Mine Land Program takes reports of dangerous mines and, for a mine on private land, a notarized Consent to Entry form so it can address the opening. A property question starts with the mines database and the program's FAQ.

New York

The NYS DEC Mined Land Reclamation Database holds records of more than 3,700 mines and 1,800 companies searchable by county, town and commodity, and the DEC's Mines and Wells map shows them. These cover permitted mines rather than historic underground workings, and New York has no coal abandoned mine land program.

New York has no coal AML program; the DEC database covers permitted mines, not historic underground workings.

North Carolina

The North Carolina Geological Survey publishes the state's geology and the DEQ Mining Program permits active mines. North Carolina publishes no abandoned mine inventory online.

No abandoned mine inventory is published online.

North Dakota

The North Dakota Public Service Commission runs the Abandoned Mine Lands program for hazards from abandoned surface and underground lignite mines and tells anyone building in a historic mining town to ask before building. The North Dakota Geological Survey publishes the state's coal maps at 24K and 100K scale. A homeowner asks the commission's AML program whether a parcel is undermined before building.

The PSC asks anyone building in a historic lignite mining town to ask the AML program first.

Ohio

The Ohio Mines Locator from the Ohio Department of Natural Resources shows thousands of mapped surface and underground coal and mineral mines by street address, with the abandoned underground mine polygons digitised from archival maps by county and a statewide shapefile download. The ODNR Division of Mineral Resources Management runs the abandoned mine land program and takes questions at minerals@dnr.ohio.gov. The Ohio Mine Subsidence Insurance Fund adds cover to every homeowner policy for $1 a year in 26 mandatory counties and for $5 a year by choice in 11 optional counties, with claims going to the homeowner's agent.

Coverage is automatic in the 26 mandatory counties (Athens, Belmont, Carroll, Columbiana, Coshocton, Gallia, Guernsey, Harrison, Hocking, Holmes, Jackson, Jefferson, Lawrence, Mahoning, Meigs, Monroe, Morgan, Muskingum, Noble, Perry, Scioto, Stark, Trumbull, Tuscarawas, Vinton, Washington) and optional in 11 more.

Oklahoma

The Oklahoma Department of Mines posts its historic underground mining maps county by county, with mine name, section, township and range and map date for Atoka, Coal, Craig, Haskell, Latimer, LeFlore, Okmulgee, Pittsburg, Rogers, Tulsa and other counties. The Oklahoma Conservation Commission Land Restoration program reclaims abandoned mined land and has a Report an Abandoned Mine form. A homeowner finds the parcel's section, township and range and checks the county list for a mine map that covers it.

Oregon

The Oregon Department of Geology and Mineral Industries scans its large format mine maps from the Portland and Grants Pass offices and serves them as PDFs, and its Mineral Information Layer for Oregon (MILO-4) maps mineral occurrences, prospects and mines with links to those maps and the historical county mining records. Oregon has no state abandoned mine land program page. A homeowner finds the mine in MILO and opens its linked map.

Oregon has no state abandoned mine land program page; abandoned mine hazards on federal land are a BLM and Forest Service matter.

Pennsylvania

The Pennsylvania DEP mine subsidence risk lookup at gis.dep.pa.gov/msiRisk takes a street address and shows whether the site falls in a gray Underground Mining Area, which means it is over or near a known mined area. The Pennsylvania Mine Map Atlas, hosted for DEP by Penn State, shows the scanned historic underground coal mine maps at a chosen location, each linked to its PHUMMIS inventory record. Open subsidence holes, shafts and portals are reported to the DEP Bureau of Abandoned Mine Reclamation district office in Ebensburg (814-472-1800) or Wilkes-Barre (570-826-2371), after hours 800-541-2050. DEP sells Mine Subsidence Insurance for damage from the collapse of abandoned underground coal and clay mines, with $150,000 of residential cover costing $41.25 a year.

DEP has an address lookup for mine subsidence risk at https://gis.dep.pa.gov/msiRisk/ : enter a street address and if the site falls in a gray Underground Mining Area it is over or near a known mined area (read live). PHUMMIS at https://www.ahs.dep.pa.gov/Phummis/ is linked from the DEP Act 54 maps page; its certificate chain cannot be verified from this box and the exact url is not in the search index.

Rhode Island

No Rhode Island state page on mines or abandoned mines was found. The state has no abandoned mine program.

No state page on mines or abandoned mines was found; Rhode Island has no active state geological survey site for this.

This state publishes no mine map collection and no abandoned mine land programme of its own. The federal sources at the top of this page are the ones to use.

South Carolina

The South Carolina Geological Survey in SCDNR publishes the state's mineral resources overview. South Carolina publishes no abandoned mine inventory and has no abandoned mine land program.

No abandoned mine inventory is published.

South Dakota

The South Dakota Department of Agriculture and Natural Resources Minerals and Mining Program regulates mining and publishes the state's mining history pages, with the South Dakota Geological Survey linked from them. South Dakota has no coal abandoned mine land program, and the old abandoned mine openings are in the Black Hills.

South Dakota has no coal AML program; its old abandoned mines are in the Black Hills and the old denr.sd.gov AML page no longer resolves.

Tennessee

The Tennessee Department of Environment and Conservation Division of Mineral and Geologic Resources holds the state geological survey, the Abandoned Mine Lands Program and the mining data and map viewers. A homeowner in the Cumberland Plateau coalfield starts with the division's map viewers and the AML program.

Tennessee's coal regulatory program was run by OSMRE until the state took it back; the state AML program is in TDEC.

Texas

The Railroad Commission of Texas Abandoned Mine Land Program reclaims pre 1977 mines and closes dangerous underground openings by backfilling, capping or gating, and its abandoned mine land data map shows the sites. Texas publishes no underground mine map viewer, so a property question goes to the commission's Surface Mining division.

Utah

The Utah Geological Survey publishes a digital database of abandoned coal mine maps with an interactive map, and its Utah Mineral Resources map shows mines, prospects and mine waste across the state. The Division of Oil, Gas and Mining Abandoned Mine Reclamation Program seals the openings of an estimated 10,000 abandoned mines and answers questions by email during office hours. A homeowner in the coal counties opens the abandoned coal mines map and looks for workings under the parcel.

Vermont

The Vermont Geological Survey publishes the state's mineral resources pages on granite, marble, slate and industrial minerals but no abandoned mine inventory. Vermont has no abandoned mine land program.

Vermont publishes no abandoned mine map; the Elizabeth copper mine is a federal Superfund site.

Virginia

Virginia Energy scans and catalogs the archived underground coal mine maps of the Southwest Virginia Coalfield into a searchable database and serves the active and abandoned underground mine extents as a map service. Its Abandoned Mine Land Program at 3405 Mountain Empire Road, Big Stone Gap, handles hazards from pre law mining and posts its project location maps and an AML web map. A homeowner in the coalfield asks the Big Stone Gap office whether the mine extents cover the parcel.

Washington

The Washington Geological Survey holds the state coal mine map collection, about 1,100 maps of about 230 mines organised by county in 65 zip files and catalogued in Open File Report 94-7, kept for mine subsidence hazard evaluation. Washington has no state abandoned mine land program page. A homeowner in a former coal town such as those in King, Pierce, Kittitas or Lewis County finds the mine in the catalog and downloads the county file.

Washington has no state abandoned mine land program page; the survey's coal mine maps are the record.

West Virginia

The West Virginia Geological and Economic Survey serves scanned mine maps through its Mine Information Database System, searched by county, quadrangle, coal bed, company, mine name, permit number or date, and its Coal Bed Mapping Project shows the mined area polygons by coal bed. The Office of Miners' Health, Safety and Training keeps the legal Mine Map Archives of final certified maps, required since the 1968 Hominy Falls disaster. Subsidence holes, portals and mine fires from pre 1977 coal mining are reported to the WV DEP Abandoned Mine Lands program, and mine subsidence cover is sold with a homeowner policy under the state program run by the Board of Risk and Insurance Management.

The Office of Miners Health Safety and Training keeps the legal Mine Map Archives (final certified maps required since the 1968 Hominy Falls disaster) at https://minesafety.wv.gov/historical-statistical-data/west-virginia-mine-map-archives/ (read live).

Wisconsin

The Wisconsin Geological and Natural History Survey publishes the state's lead, zinc and iron mining history and maps. Wisconsin has no coal abandoned mine land program, and the old lead and zinc workings lie in the southwest counties.

Wisconsin has no coal AML program; the old lead and zinc workings are in the southwest counties.

Wyoming

The Wyoming DEQ Abandoned Mine Land Division in Cheyenne takes reports of hazardous mine conditions at 307-777-6145 and asks landowners to call before building over historic underground mines. To learn whether a property is over or near a mined area the division says to ask the city engineer, the county planning office or the AML Division at 1-800-510-0283. The Wyoming Mine Subsidence Insurance Program run by the division covers homes and businesses at $2 per $1,000 of cover up to $275,000 per structure, and the Wyoming State Geological Survey publishes the mines and minerals GIS data.

No public mine map viewer was found; the AML Division at 1-800-510-0283 answers whether a property is over or near a mined area.

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State by state

Every state, mapped

One map per state: the outline from the Census Bureau and one dot per county, sized by what the two federal files record there. Each map opens the state page.

Alabama: counties with old mine sites or mapped mine featuresAlabama6,904 records in 66 countiesAlaska: counties with old mine sites or mapped mine featuresAlaska13,457 records in 29 countiesArizona: counties with old mine sites or mapped mine featuresArizona42,133 records in 15 countiesArkansas: counties with old mine sites or mapped mine featuresArkansas5,635 records in 75 countiesCalifornia: counties with old mine sites or mapped mine featuresCalifornia76,504 records in 58 countiesColorado: counties with old mine sites or mapped mine featuresColorado48,592 records in 64 countiesConnecticut: counties with old mine sites or mapped mine featuresConnecticut0 records in 0 countiesDelaware: counties with old mine sites or mapped mine featuresDelaware257 records in 3 countiesFlorida: counties with old mine sites or mapped mine featuresFlorida2,943 records in 65 countiesGeorgia: counties with old mine sites or mapped mine featuresGeorgia3,752 records in 154 countiesHawaii: counties with old mine sites or mapped mine featuresHawaii318 records in 4 countiesIdaho: counties with old mine sites or mapped mine featuresIdaho20,681 records in 44 countiesIllinois: counties with old mine sites or mapped mine featuresIllinois5,279 records in 101 countiesIndiana: counties with old mine sites or mapped mine featuresIndiana2,737 records in 91 countiesIowa: counties with old mine sites or mapped mine featuresIowa5,908 records in 99 countiesKansas: counties with old mine sites or mapped mine featuresKansas4,833 records in 105 countiesKentucky: counties with old mine sites or mapped mine featuresKentucky12,717 records in 116 countiesLouisiana: counties with old mine sites or mapped mine featuresLouisiana1,886 records in 58 countiesMaine: counties with old mine sites or mapped mine featuresMaine5,595 records in 16 countiesMaryland: counties with old mine sites or mapped mine featuresMaryland1,817 records in 22 countiesMassachusetts: counties with old mine sites or mapped mine featuresMassachusetts2,809 records in 14 countiesMichigan: counties with old mine sites or mapped mine featuresMichigan11,428 records in 83 countiesMinnesota: counties with old mine sites or mapped mine featuresMinnesota11,324 records in 87 countiesMississippi: counties with old mine sites or mapped mine featuresMississippi4,657 records in 81 countiesMissouri: counties with old mine sites or mapped mine featuresMissouri16,678 records in 109 countiesMontana: counties with old mine sites or mapped mine featuresMontana26,767 records in 56 countiesNebraska: counties with old mine sites or mapped mine featuresNebraska1,762 records in 83 countiesNevada: counties with old mine sites or mapped mine featuresNevada112,894 records in 16 countiesNew Hampshire: counties with old mine sites or mapped mine featuresNew Hampshire2,520 records in 10 countiesNew Jersey: counties with old mine sites or mapped mine featuresNew Jersey2,701 records in 21 countiesNew Mexico: counties with old mine sites or mapped mine featuresNew Mexico20,662 records in 32 countiesNew York: counties with old mine sites or mapped mine featuresNew York7,479 records in 60 countiesNorth Carolina: counties with old mine sites or mapped mine featuresNorth Carolina6,198 records in 100 countiesNorth Dakota: counties with old mine sites or mapped mine featuresNorth Dakota4,417 records in 53 countiesOhio: counties with old mine sites or mapped mine featuresOhio4,236 records in 88 countiesOklahoma: counties with old mine sites or mapped mine featuresOklahoma7,961 records in 77 countiesOregon: counties with old mine sites or mapped mine featuresOregon25,370 records in 36 countiesPennsylvania: counties with old mine sites or mapped mine featuresPennsylvania9,046 records in 67 countiesRhode Island: counties with old mine sites or mapped mine featuresRhode Island271 records in 5 countiesSouth Carolina: counties with old mine sites or mapped mine featuresSouth Carolina1,735 records in 46 countiesSouth Dakota: counties with old mine sites or mapped mine featuresSouth Dakota5,928 records in 66 countiesTennessee: counties with old mine sites or mapped mine featuresTennessee8,106 records in 94 countiesTexas: counties with old mine sites or mapped mine featuresTexas23,969 records in 254 countiesUtah: counties with old mine sites or mapped mine featuresUtah26,891 records in 29 countiesVermont: counties with old mine sites or mapped mine featuresVermont1,732 records in 14 countiesVirginia: counties with old mine sites or mapped mine featuresVirginia8,916 records in 94 countiesWashington: counties with old mine sites or mapped mine featuresWashington18,639 records in 39 countiesWest Virginia: counties with old mine sites or mapped mine featuresWest Virginia4,448 records in 54 countiesWisconsin: counties with old mine sites or mapped mine featuresWisconsin14,068 records in 72 countiesWyoming: counties with old mine sites or mapped mine featuresWyoming10,862 records in 23 counties

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The experts

Who actually knows this subject

Below the state offices sits the research layer: the federal mining research laboratories, the university departments that study ground control and subsidence, and the national bodies abroad that run the programmes the United States does not. Every page was opened before it was listed. A person is named only where that body names them in the role on its own page, and the page is linked, because names go stale and the office does not.

Federal and national, United States
Universities and state surveys inside them
Outside the United States: the countries with an address level service

The United Kingdom is the model: a government address check and a mining report that lists every mine entry within 20 metres of a property boundary, a 24 hour hazard line, a damage claim route and a public map. New South Wales runs the nearest equivalent in Australia.

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The data

Where these numbers come from

Two federal files are read. The USGS Mineral Resources Data System is the file of named mines, prospects and mineral occurrences, 304,632 records, 274,114 with a position; a site counts as old here when that file calls it a past producer, a prospect or an occurrence rather than a producing mine. That file holds almost no coal: 157 coal records in the whole country and none at all in Pennsylvania, West Virginia or Illinois, so on its own it would show Scranton with one sand pit. The USGS topographic mine features file fills that gap: 466,747 shafts, adits, mine entrances, pits and quarries digitised from the historical topographic sheets, each one carrying the sheet name and the year it was surveyed, 97,226 of them underground openings. The town and county boundaries come from the Census Bureau TIGER files, and every point was placed by its own coordinates.

Neither file is the mine map. A topographic sheet shows the opening on the surface, not the rooms under it, and the mineral file shows a deposit, not a parcel line. The state offices above hold the maps.

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For newsrooms

The finding, the method, its limits and the data, on one page you can quote and check.

Read the public alert page