Coal production
0reported short tons
ACTIVE / CONTROLLER PORTFOLIO
Membership and operating status are from the latest MSHA Mines snapshot. Open a mine for its ownership history.
MINE PORTFOLIO
2025-01-01 – 2026-10-13. Active records; production reporting is not required.
Material, method and type filters apply to this table. The portfolio’s status applies to the entire page. GEM fields describe their own release, not the selected MSHA year.
| Mine | Location / type | Coal · short tons | Hours worked | Violations | Accident records | On-site inspection hours |
|---|---|---|---|---|---|---|
| 115 Quarry3100095 · Active6/8 quarters reported | Wilkes, NCSurface · MSHA: Crushed, Broken Granite | 0 | 38,343 | 0 | 0 | 49.5 |
| 1604 Quarry4101241 · Active6/8 quarters reported | Bexar, TXSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 207,151 | 4 | 2 | 75.0 |
| Abilene Black Lease Quarry4103489 · Active6/8 quarters reported | Taylor, TXSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 65,807 | 4 | 0 | 26.3 |
| Adairsville Quarry0901026 · Active6/8 quarters reported | Bartow, GASurface · MSHA: Crushed, Broken Limestone NEC | 0 | 100,128 | 1 | 0 | 44.5 |
| Adamsville0103508 · Active6/8 quarters reported | Jefferson, ALSurface · MSHA: Crushed, Broken Stone NEC | 0 | 34,228 | 0 | 1 | 23.5 |
| ANDERSON QUARRY3800340 · Active6/8 quarters reported | Anderson, SCSurface · MSHA: Crushed, Broken Granite | 0 | 34,560 | 0 | 1 | 43.8 |
| Aragon0901214 · Active6/8 quarters reported | Polk, GASurface · MSHA: Lime | 0 | 61,423 | 1 | 1 | 42.5 |
| Astatula Sand Plant0800300 · Active6/8 quarters reported | Lake, FLSurface · MSHA: Sand, Common | 0 | 55,136 | 0 | 1 | 26.3 |
| Athens Quarry4000125 · Active6/8 quarters reported | Mcminn, TNSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 41,382 | 2 | 1 | 57.3 |
| Augusta Plant4402337 · Active6/8 quarters reported | Augusta, VASurface · MSHA: Crushed, Broken Limestone NEC | 0 | 45,824 | 1 | 1 | 43.0 |
| Augusta Quarry0900907 · Active6/8 quarters reported | Columbia, GASurface · MSHA: Crushed, Broken Granite | 0 | 114,691 | 3 | 1 | 71.3 |
| Austin Quarry0405954 · Active6/8 quarters reported | Madera, CASurface · MSHA: Crushed, Broken Stone NEC | 0 | 95,619 | 1 | 0 | 35.5 |
| Azusa Rock0404674 · Active6/8 quarters reported | Los Angeles, CASurface · MSHA: Crushed, Broken Stone NEC | 0 | 62,209 | 2 | 1 | 51.3 |
| Barbers Corner Quarry1101102 · Active6/8 quarters reported | Will, ILSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 52,541 | 6 | 1 | 60.5 |
| Barin Quarry0900072 · Active6/8 quarters reported | Muscogee, GASurface · MSHA: Crushed, Broken Granite | 0 | 136,237 | 6 | 3 | 73.5 |
| Bartlett Underground Quarry1103115 · Active6/8 quarters reported | Cook, ILUnderground · MSHA: Crushed, Broken Limestone NEC | 0 | 118,190 | 11 | 0 | 244.5 |
| Bartow Quarry0901079 · Active6/8 quarters reported | Bartow, GASurface · MSHA: Crushed, Broken Granite | 0 | 88,645 | 0 | 0 | 65.5 |
| Benton County Quarry4000098 · Active6/8 quarters reported | Benton, TNSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 105,405 | 1 | 0 | 35.5 |
| Bessemer Quarry0103055 · Active6/8 quarters reported | Jefferson, ALSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 23,644 | 0 | 1 | 29.3 |
| Black Rock Quarry0300062 · Active6/8 quarters reported | Lawrence, ARSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 43,711 | 2 | 0 | 35.0 |
| BLACKSBURG QUARRY3800536 · Active6/8 quarters reported | Cherokee, SCSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 37,025 | 0 | 0 | 61.5 |
| BLAIR QUARRY3800010 · Active6/8 quarters reported | Fairfield, SCSurface · MSHA: Crushed, Broken Granite | 0 | 37,147 | 0 | 0 | 44.0 |
| BLAIRSVILLE QUARRY0900445 · Active6/8 quarters reported | Union, GASurface · MSHA: Crushed, Broken Granite | 0 | 65,331 | 0 | 1 | 55.8 |
| Bolingbrook Underground1103149 · Active6/8 quarters reported | Will, ILUnderground · MSHA: Crushed, Broken Limestone NEC | 0 | 11,977 | 0 | 0 | 26.5 |
| Boone Quarry3100368 · Active6/8 quarters reported | Watauga, NCSurface · MSHA: Crushed, Broken Granite | 0 | 80,537 | 6 | 0 | 82.0 |
| Briggs Plant4101072 · Active6/8 quarters reported | Victoria, TXSurface · MSHA: Construction Sand and Gravel | 0 | 309,918 | 13 | 2 | 79.3 |
| Bristol Quarry4002872 · Active6/8 quarters reported | Sullivan, TNSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 35,965 | 0 | 0 | 58.0 |
| Brooksville Quarry0103154 · Active6/8 quarters reported | Blount, ALSurface · MSHA: Crushed, Broken Sandstone | 0 | 55,090 | 0 | 0 | 36.5 |
| Brownwood Quarry4100083 · Active6/8 quarters reported | Brown, TXSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 186,134 | 12 | 1 | 46.3 |
| Cabarrus Quarry3101357 · Active6/8 quarters reported | Cabarrus, NCSurface · MSHA: Crushed, Broken Granite | 0 | 101,124 | 0 | 0 | 64.8 |
| Calcium Plant0801264 · Active6/8 quarters reported | Hernando, FLSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 39,943 | 2 | 1 | 34.0 |
| Calera Quarry0100050 · Active6/8 quarters reported | Shelby, ALSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 278,231 | 12 | 3 | 59.0 |
| Central Quarry1500016 · Active6/8 quarters reported | Fayette, KYUnderground · MSHA: Crushed, Broken Limestone NEC | 0 | 96,676 | 2 | 0 | 264.8 |
| Charleston Ship Yard3800754 · Active6/8 quarters reported | Charleston, SCFacility · MSHA: Crushed, Broken Granite | 0 | 38,247 | 0 | 0 | 27.5 |
| Chattanooga Quarry4000107 · Active6/8 quarters reported | Hamilton, TNSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 139,409 | 5 | 0 | 107.0 |
| Cherokee Quarry0100036 · Active6/8 quarters reported | Colbert, ALSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 113,446 | 1 | 1 | 49.3 |
| CHEROKEE QUARRY0901112 · Active6/8 quarters reported | Cherokee, GASurface · MSHA: Crushed, Broken Granite | 0 | 73,812 | 2 | 0 | 57.5 |
| Chico Quarry4104646 · Active6/8 quarters reported | Wise, TXSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 91,110 | 3 | 1 | 44.5 |
| CHILDERSBURG QUARRY0100037 · Active6/8 quarters reported | Talladega, ALSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 30,022 | 0 | 0 | 50.5 |
| Chula Vista Quarry0404080 · Active6/8 quarters reported | San Diego, CASurface · MSHA: Construction Sand and Gravel | 0 | 138,215 | 6 | 0 | 55.0 |
| Clarksville Quarry4000090 · Active6/8 quarters reported | Montgomery, TNSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 133,935 | 3 | 0 | 168.8 |
| CLEAR CREEK QUARRY3102087 · Active6/8 quarters reported | Mecklenburg, NCSurface · MSHA: Crushed, Broken Stone NEC | 0 | 45,738 | 3 | 1 | 52.0 |
| Cleveland Quarry4000009 · Active6/8 quarters reported | Bradley, TNSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 77,189 | 1 | 0 | 80.5 |
| Coldwater Quarry0103135 · Active6/8 quarters reported | Calhoun, ALSurface · MSHA: Crushed, Broken Quartzite | 0 | 30,808 | 0 | 0 | 24.8 |
| Columbia Quarry4000020 · Active6/8 quarters reported | Maury, TNUnderground · MSHA: Crushed, Broken Limestone NEC | 0 | 60,621 | 1 | 1 | 71.8 |
| COLUMBIA QUARRY3800013 · Active6/8 quarters reported | Richland, SCSurface · MSHA: Crushed, Broken Granite | 0 | 172,043 | 8 | 0 | 113.3 |
| Cookeville Quarry4003068 · Active6/8 quarters reported | Putnam, TNSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 81,416 | 0 | 0 | 68.0 |
| Coram Materials Corp3000794 · Active6/8 quarters reported | Suffolk, NYSurface · MSHA: Construction Sand and Gravel | 0 | 56,759 | 3 | 1 | 41.8 |
| Corona Plant0405095 · Active6/8 quarters reported | Riverside, CASurface · MSHA: Construction Sand and Gravel | 0 | 123,552 | 2 | 0 | 57.8 |
| Cross Quarry3800770 · Active4/8 quarters reported | Orangeburg, SCSurface · MSHA: Crushed, Broken Granite | 0 | 7,126 | 1 | 0 | 45.0 |
| Dahlonega Quarry0901105 · Active6/8 quarters reported | Lumpkin, GASurface · MSHA: Crushed, Broken Granite | 0 | 61,255 | 0 | 0 | 53.5 |
| DALE PLANT4400108 · Active6/8 quarters reported | Chesterfield, VASurface · MSHA: Crushed, Broken Granite | 0 | 84,087 | 0 | 4 | 48.5 |
| DALTON QUARRY0900008 · Active6/8 quarters reported | Whitfield, GASurface · MSHA: Crushed, Broken Limestone NEC | 0 | 74,732 | 2 | 0 | 73.0 |
| Danley Quarry4000102 · Active6/8 quarters reported | Davidson, TNSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 115,589 | 2 | 3 | 50.3 |
| Dayton Quarry4002961 · Active6/8 quarters reported | Rhea, TNSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 26,766 | 2 | 0 | 48.5 |
| Diamond Sand Plant0801354 · Active6/8 quarters reported | Polk, FLSurface · MSHA: Sand, Common | 0 | 45,187 | 0 | 0 | 13.5 |
| Dickson Quarry4000173 · Active6/8 quarters reported | Dickson, TNSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 97,189 | 5 | 0 | 57.8 |
| DILLON ROAD PIT0404937 · Active6/8 quarters reported | Riverside, CASurface · MSHA: Construction Sand and Gravel | 0 | 27,363 | 8 | 0 | 35.5 |
| Dixie Lee Quarry4001427 · Active6/8 quarters reported | Knox, TNSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 94,132 | 0 | 1 | 62.5 |
| Dolcito Quarry0100009 · Active6/8 quarters reported | Jefferson, ALSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 74,399 | 18 | 0 | 57.5 |
| DREYFUS QUARRY3800258 · Active6/8 quarters reported | Richland, SCSurface · MSHA: Crushed, Broken Granite | 0 | 141,998 | 3 | 2 | 90.0 |
| Durbin Plant0401734 · Active6/8 quarters reported | Los Angeles, CASurface · MSHA: Construction Sand and Gravel | 0 | 131,572 | 1 | 1 | 35.5 |
| East Forsyth3101919 · Active6/8 quarters reported | Forsyth, NCSurface · MSHA: Crushed, Broken Granite | 0 | 64,093 | 2 | 0 | 53.8 |
| Eastland Quarry4101923 · Active6/8 quarters reported | Eastland, TXSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 109,870 | 7 | 0 | 42.8 |
| Elkin3100092 · Active6/8 quarters reported | Surry, NCSurface · MSHA: Crushed, Broken Granite | 0 | 48,368 | 1 | 0 | 44.3 |
| ELLIJAY QUARRY0900927 · Active6/8 quarters reported | Gilmer, GASurface · MSHA: Crushed, Broken Granite | 0 | 59,878 | 3 | 0 | 78.0 |
| Enka3100084 · Active6/8 quarters reported | Buncombe, NCSurface · MSHA: Crushed, Broken Granite | 0 | 95,382 | 0 | 0 | 82.0 |
| Forest Park Quarry0900012 · Active6/8 quarters reported | Clayton, GASurface · MSHA: Crushed, Broken Granite | 0 | 142,615 | 5 | 6 | 43.3 |
| Fort Knox Quarry1500079 · Active6/8 quarters reported | Hardin, KYSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 45,887 | 1 | 1 | 99.0 |
| Fort Myers Mine0800991 · Active6/8 quarters reported | Lee, FLSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 385,572 | 7 | 6 | 83.3 |
| Fort Payne Quarry0100028 · Active6/8 quarters reported | De Kalb, ALSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 48,980 | 0 | 0 | 17.3 |
| Fort Pierce Mine0800899 · Active6/8 quarters reported | St Lucie, FLSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 26,751 | 4 | 0 | 16.0 |
| Franklin Quarry4000849 · Active6/8 quarters reported | Williamson, TNUnderground · MSHA: Crushed, Broken Limestone NEC | 0 | 133,682 | 0 | 2 | 120.0 |
| Frederick Quarry1800729 · Active6/8 quarters reported | Frederick, MDSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 118,036 | 2 | 1 | 68.0 |
| FRIENDSHIP QUARRY0900878 · Active6/8 quarters reported | Hall, GASurface · MSHA: Crushed, Broken Stone NEC | 0 | 149,472 | 5 | 3 | 82.5 |
| GLENCOE QUARRY0100047 · Active6/8 quarters reported | Etowah, ALSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 59,545 | 0 | 0 | 18.0 |
| Glen Gardner Quarry2800009 · Active6/8 quarters reported | Hunterdon, NJSurface · MSHA: Crushed, Broken Stone NEC | 0 | 45,108 | 9 | 1 | 49.3 |
| Goldhead Sand Plant0800263 · Active6/8 quarters reported | Clay, FLSurface · MSHA: Sand, Common | 0 | 23,705 | 0 | 0 | 14.3 |
| Gold Hill3100096 · Active6/8 quarters reported | Cabarrus, NCSurface · MSHA: Crushed, Broken Traprock | 0 | 68,975 | 2 | 0 | 71.8 |
| GRAHAM-VIRGINIA4404951 · Active6/8 quarters reported | Fairfax, VASurface · MSHA: Crushed, Broken Granite | 0 | 167,192 | 3 | 1 | 120.0 |
| Grandin Sand Plant0801082 · Active6/8 quarters reported | Putnam, FLSurface · MSHA: Sand, Common | 0 | 52,359 | 0 | 0 | 24.0 |
| Grand Rivers Quarry1500087 · Active6/8 quarters reported | Livingston, KYSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 520,244 | 71 | 1 | 409.0 |
| GRAY COURT QUARRY3800068 · Active6/8 quarters reported | Laurens, SCSurface · MSHA: Crushed, Broken Granite | 0 | 77,551 | 3 | 0 | 74.0 |
| Grayson Quarry0900594 · Active6/8 quarters reported | Gwinnett, GASurface · MSHA: Crushed, Broken Granite | 0 | 47,025 | 1 | 0 | 45.8 |
| Greeneville Quarry4000068 · Active6/8 quarters reported | Greene, TNSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 46,378 | 3 | 1 | 87.0 |
| GREENWOOD QUARRY3800012 · Active6/8 quarters reported | Greenwood, SCSurface · MSHA: Crushed, Broken Granite | 0 | 55,848 | 1 | 1 | 85.0 |
| Greystone3100094 · Active6/8 quarters reported | Vance, NCSurface · MSHA: Crushed, Broken Granite | 0 | 74,296 | 1 | 0 | 63.8 |
| Greystone Sand & Gravel4000806 · Active6/8 quarters reported | Greene, TNSurface · MSHA: Construction Sand and Gravel | 0 | 78,411 | 2 | 0 | 104.3 |
| GRIFFIN QUARRY0900488 · Active6/8 quarters reported | Spalding, GASurface · MSHA: Crushed, Broken Granite | 0 | 105,986 | 3 | 2 | 48.5 |
| Guntersville Quarry0102523 · Active6/8 quarters reported | Marshall, ALSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 30,034 | 0 | 1 | 33.8 |
| Hamburg Quarry2800011 · Active6/8 quarters reported | Sussex, NJSurface · MSHA: Crushed, Broken Stone NEC | 0 | 106,793 | 15 | 1 | 94.3 |
| HANOVER QUARRY3600015 · Active6/8 quarters reported | Adams, PASurface · MSHA: Crushed, Broken Limestone NEC | 0 | 202,362 | 6 | 2 | 97.5 |
| HAVRE DE GRACE QUARRY1800657 · Active6/8 quarters reported | Harford, MDSurface · MSHA: Crushed, Broken Traprock | 0 | 313,855 | 9 | 6 | 91.0 |
| HELENA QUARRY0100526 · Active6/8 quarters reported | Shelby, ALSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 57,250 | 1 | 2 | 28.0 |
| Helotes Quarry4102976 · Active6/8 quarters reported | Bexar, TXSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 136,595 | 9 | 1 | 67.0 |
| Hendersonville3100091 · Active6/8 quarters reported | Henderson, NCSurface · MSHA: Crushed, Broken Granite | 0 | 83,892 | 3 | 0 | 87.0 |
| Hermitage Quarry4000103 · Active6/8 quarters reported | Davidson, TNSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 77,798 | 1 | 2 | 57.8 |
| Houston Sales Yard4103646 · Active6/8 quarters reported | Harris, TXFacility · MSHA: Crushed, Broken Stone NEC | 0 | 25,601 | 2 | 0 | 26.0 |
| Huebner Road Quarry4100047 · Active6/8 quarters reported | Bexar, TXSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 50,581 | 1 | 0 | 35.8 |
| HUNTSVILLE NORTH QUARRY0100021 · Active6/8 quarters reported | Madison, ALSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 147,450 | 5 | 0 | 34.8 |
Production and hours sum available quarterly reports. — means unavailable; zero safety records means none in the selected imported period. Ownership reflects the current MSHA record.
LOCATION
228 of 228 mines with usable MSHA coordinates. Select a marker to open a mine.
2025 Q1 – 2026 Q4
Database snapshot · 2026-10-13. All 228 mines listed under this controller were checked; 228 have reports in the available quarters. Totals use current ownership.
reported short tons
reported employee hours
production ÷ hours worked
Missing values appear as —. Totals use available reports. Tons per hour requires production and hours for the same quarters and a nonzero hours total. * Striped bars mark partial mine coverage or an incomplete quarter. See the table for coverage.
| Quarter | Coal (short tons) | Hours worked | Tons / hour | Avg. employees | Coverage |
|---|---|---|---|---|---|
| 2025 Q1 | 0 | 3,246,943 | 0.00 | 6,027 | 227/228 mines reporting |
| 2025 Q2 | 0 | 3,513,839 | 0.00 | 6,130 | 227/228 mines reporting |
| 2025 Q3 | 0 | 3,602,026 | 0.00 | 6,128 | 228/228 mines reporting |
| 2025 Q4 | 0 | 3,366,681 | 0.00 | 6,091 | 228/228 mines reporting |
| 2026 Q1 | 0 | 3,371,438 | 0.00 | 6,171 | 228/228 mines reporting |
| 2026 Q2 | 0 | 3,582,378 | 0.00 | 6,226 | 228/228 mines reporting |
| 2026 Q3 | — | — | — | — | No report |
| 2026 Q4 | — | — | — | — | No report |
2025-01-01 – 2026-10-13
95 significant & substantial (S&S)
0 records classified as fatality
670 of 723 violations with amounts
1,098 inspections · 1,098 with hours
Counts are published records, including contractor records. * The quarter was incomplete at the snapshot date; recent counts may rise as reports arrive. — means no reported amount or hours. Portfolio totals use current membership.
| Quarter | Violations | S&S | Proposed USD | Accident records | Fatality records | Inspections | On-site hours |
|---|---|---|---|---|---|---|---|
| 2025-Q1 | 98 | 16 | 31,883.00 | 20 | 0 | 145 | 1,874.8 |
| 2025-Q2 | 112 | 11 | 43,058.00 | 34 | 0 | 154 | 1,974.5 |
| 2025-Q3 | 137 | 25 | 36,979.00 | 25 | 0 | 177 | 2,038.3 |
| 2025-Q4 | 100 | 8 | 20,890.00 | 19 | 0 | 129 | 1,997.5 |
| 2026-Q1 | 81 | 9 | 23,765.00 | 28 | 0 | 174 | 2,134.8 |
| 2026-Q2 | 86 | 9 | 25,226.00 | 21 | 0 | 157 | 2,043.5 |
| 2026-Q3 | 100 | 16 | 11,820.00 | 16 | 0 | 148 | 1,787.0 |
| 2026-Q4 * | 9 | 1 | — | 0 | 0 | 14 | 74.3 |
All violations issued in the selected period. Counts combine subsections.
Impoundment Spot Inspection · 0.0 on-site hours
Regular Safety and Health Inspection · 0.0 on-site hours
56.14207
56.14100(b)
56.12028
Regular Safety and Health Inspection · 14.5 on-site hours
Regular Safety and Health Inspection · 0.0 on-site hours
Regular Safety and Health Inspection · 9.3 on-site hours
56.4101
47.41(a)
56.4201(a)(1)
56.14109(b)(2)
Regular Safety and Health Inspection · 0.0 on-site hours
Regular Safety and Health Inspection · 0.0 on-site hours
Regular Safety and Health Inspection · 0.0 on-site hours
Regular Safety and Health Inspection · 22.5 on-site hours
56.4201(a)(2)
Regular Safety and Health Inspection · 6.5 on-site hours
Spot Inspection · 0.0 on-site hours
56.14130(g) · S&S
Regular Safety and Health Inspection · 4.0 on-site hours
Regular Safety and Health Inspection · 11.5 on-site hours
Regular Safety and Health Inspection · 6.0 on-site hours
Spot Inspection · 11.0 on-site hours
Spot Inspection · 0.0 on-site hours
MSHA Violations (issue date), Accidents (accident date), and Inspections (begin date). Snapshot 2026-10-13.
Counts describe published rows, including contractor records; accident records are not distinct incidents or numbers of people injured.
Zero means no matching records in the imported sources, not proof of no events. Historical coverage differs by source; absence before a source begins reporting is not a zero incident rate. Invalid or absent dates and records after the snapshot are excluded.
S&S means SIG_SUB=Y. Fatality records use DEGREE_INJURY_CD=01. Proposed penalties are not final assessed or paid amounts; missing dollar values are omitted.
Inspection hours are SUM_TOTAL_ON_SITE_HOURS attributed to the inspection start date, without supervisor/trainee hours. Missing hours are omitted; a started inspection may still be open.
Portfolio totals use current mine membership, including events before the current owner or operator's tenure.
CFR headings link to the current Title 30 index; they are not historical legal determinations.
SELECTED PORTFOLIO
Relationships reflect the selected mine status and current MSHA controller/operator fields.