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 |
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1887 | Clifford | | Colliery | Shaft | 1 | Clifford Twp. | Susquehanna | Hillside Coal & Iron Co. | 0 | | 0 | 0 | | 27 | Sinking shaft. | 1888 | Clifford | | Colliery | Shaft / Slope | 1 | Forest City | Susquehanna | Hillside Coal & Iron Co. | 0 | | 0 | 2,328 | | 159 | | 1889 | Clifford | | Colliery | Shaft / Slope | 1 | Forest City | Susquehanna | Hillside Coal & Iron Co. | 58,201 | | 0 | 69,964 | 209 | 137 | | 1890 | Clifford | | Colliery | Shaft / Slope | 1 | Forest City | Susquehanna | Hillside Coal & Iron Co. | 96,228 | | 0 | 105,186 | 207 | 233 | | 1891 | Clifford | | Colliery | Shaft / Slope | 2 | Forest City | Susquehanna | Hillside Coal & Iron Co. | 125,513 | | 0 | 137,218 | 208 | 257 | | 1892 | Clifford | | Colliery | Shaft 1 | 1 | Forest City | Susquehanna | Hillside Coal & Iron Co. | 206,097 | | 0 | 218,167 | 216 | 393 | | 1893 | Clifford | | Colliery | Shaft 1 | 1 | Forest City | Susquehanna | Hillside Coal & Iron Co. | 221,014 | | 0 | 156,228 | 199 | 402 | | 1894 | Clifford | | Colliery | Shaft 1 | 1 | Forest City | Susquehanna | Hillside Coal & Iron Co. | 239,783 | | 0 | 149,511 | 168 | 402 | Of the number of tons shipped from Clifford, 93,435 tons were mined at Forest City | 1895 | Clifford | | Colliery | Shaft 1 | 1 | Forest City | Susquehanna | Hillside Coal & Iron Co. | 221,228 | | 0 | 143,489 | 161 | 427 | | 1896 | Clifford | | Colliery | Shaft 1 | 1 | Forest City | Susquehanna | Hillside Coal & Iron Co. | 234,669 | | 0 | 146,310 | 143 | 424 | | 1897 | Clifford | | Colliery | Shaft 1 | 1 | Forest City | Susquehanna | Hillside Coal & Iron Co. | 214,810 | | 0 | 141,680 | 133 | 448 | | 1898 | Clifford | | Colliery | Shaft 1 | 1 | Forest City | Susquehanna | Hillside Coal & Iron Co. | 215,332 | New York, Lake Erie and Western Railroad | 0 | 129,707 | 124 | 429 | | 1899 | Clifford | | Colliery | Shaft 1 | 1 | Forest City | Susquehanna | Hillside Coal & Iron Co. | 327,278 | Erie | 0 | 184,235 | 175 | 422 | | 1900 | Clifford | | Colliery | Shaft 1 | 1 | Forest City | Susquehanna | Hillside Coal & Iron Co. | 370,902 | Erie | 0 | 175,261 | 180 | 421 | | 1901 | Clifford | | Colliery | Shaft 1 | 1 | Forest City | Susquehanna | Hillside Coal & Iron Co. | 292,038 | Erie | 0 | 171,462 | 163 | 470 | | 1902 | Clifford | | Colliery | Shaft 1 | 1 | Forest City 1 | Susquehanna | Hillside Coal & Iron Co. | 169,096 | Erie | 0 | 105,390 | 110 | 470 | | 1903 | Clifford | | Colliery | Shaft | 1 | Forest City 1 | Susquehanna | Hillside Coal & Iron Co. | 189,687 | Erie | 0 | 203,323 | 228 | 446 | | 1904 | Clifford | | Colliery | Shaft | 1 | Forest City 1 | Susquehanna | Hillside Coal & Iron Co. | 291,549 | Erie | 0 | 306,647 | 210 | 451 | | 1905 | Clifford | | Colliery | Shaft | 1 | Forest City 1 | Susquehanna | Hillside Coal & Iron Co. | 259,139 | Erie | 0 | 166,865 | 207 | 408 | | 1906 | Clifford | | Colliery | Shaft | 1 | Forest City 1 | Susquehanna | Hillside Coal & Iron Co. | 214,350 | Erie | 0 | 229,821 | 205 | 506 | | 1907 | Clifford | | Colliery | Shaft | 1 | Forest City 1 | Susquehanna | Hillside Coal & Iron Co. | 253,877 | Erie | 0 | 269,455 | 236 | 496 | | 1908 | Clifford | | Colliery | Shaft | 1 | Forest City 1 | Susquehanna | Hillside Coal & Iron Co. | 290,999 | Erie | 0 | 320,536 | 212 | 518 | |
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