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County | No. of Underground Mine Operators | No. of Underground Mines | No. of Underground Mine Employees | No. of Hours Worked at Underground Mines | No. of Tons Produced at Underground Mines |
Columbia | 1 | 1 | 44 | 93,826 | 172,261 |
Dauphin | 3 | 4 | 6 | 5,340 | 2,134 |
Northumberland | 5 | 5 | 22 | 29,078 | 18,314 |
Schuylkill | 17 | 17 | 67 | 102,284 | 115,755 |
REGION TOTALS | 26* | 27 | 139 | 230,528 | 308,464 |