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County | No. of Underground Mine Operators | No. of Underground Mines | No. of Underground Mine Employees | Hours Worked at Underground Mines | No. of Tons Produced at Underground Mines |
Columbia | 1 | 1 | 47 | 102,186 | 141,161 |
Dauphin | 1 | 1 | 4 | 6,328 | 4,667 |
Northumberland | 2 | 2 | 9 | 14,110 | 7,268 |
Schuylkill | 8 | 8 | 50 | 78,808 | 82,803 |
REGION TOTALS | 12* | 12 | 110 | 201,432 | 235,899 |
*Because some companies may operate in more than one county, this figure may not equal the sum of the individual county totals.