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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 | 46 | 105,351 | 133,207 |
Dauphin | 2 | 2 | 4 | 1,138 | 253 |
Northumberland | 2 | 3 | 30 | 17,312 | 11,482 |
Schuylkill | 11 | 11 | 48 | 82,842 | 44,957 |
REGION TOTALS | 15* | 17 | 128 | 206,643 | 189,899 |
**Because some companies operate in more than one county, this figure does not equal the sum of the individual county totals.