| Year | Operation Name | Number | Type | Opening | District | City | County | Company Name | Railroad Shipments (tons) | Railroad to Mine | Truck Shipments (tons) | Total Production (tons) | Days Worked | Employees | Notes |
|---|
| 1903 | Clarence | | Colliery | Slope | 5 | | Luzerne | Clarence Coal Co. | 28,500 | E&WV | 0 | 28,630 | 150 | 190 | |
| 1904 | Clarence | | Colliery | No. 1 Slope / No. 2 Slope | 5 | | Luzerne | Clarence Coal Co. | 65,514 | Erie | 0 | 72,162 | 233 | 246 | |
| 1905 | Clarence | | Colliery | No. 1 Slope / No. 2 Slope | 5 | | Luzerne | Clarence Coal Co. | 67,308 | Erie | 0 | 73,822 | 234 | 245 | |
| 1906 | Clarence | | Colliery | No. 1 Slope / No. 2 Slope | 6 | | Luzerne | Clarence Coal Co. | 18,787 | | 0 | 21,278 | 59 | | Sold to Hillside Coal & Iron Co. in April |
| 1906 | Clarence | | Colliery | No. 1 Slope / No. 2 Slope | 6 | | Luzerne | Hillside Coal & Iron Co. | 28,950 | NYS&W | 0 | 32,618 | 126 | 203 | |
| 1907 | Clarence | | Colliery | No. 1 Slope / No. 2 Slope | 6 | | Luzerne | Hillside Coal & Iron Co. | 28,487 | CNJ | 0 | 34,630 | 158 | 215 | |
| 1908 | Clarence | | Colliery | No. 1 Slope (Idle) / No. 2 Slope (Idle) | 6 | | Luzerne | Hillside Coal & Iron Co. | 11,560 | CNJ | 0 | 15,352 | 75 | | |