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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1923 | Clifford | | Washery | | 8 | | Luzerne | Clifford Coal Co. | 16,742 | Erie | 0 | 17,516 | 61 | 41 | |
1924 | Clifford | | Washery | | 8 | | Luzerne | Clifford Coal Co. | 34,207 | Erie | 0 | 34,207 | 208 | 22 | |
1925 | Clifford | | Washery | | 8 | | Luzerne | Clifford Coal Co. | 28,950 | Erie | 9,320 | 29,909 | 170 | 65 | |
1926 | Clifford | | Washery | | 8 | | Luzerne | Clifford Coal Co. | 65,602 | Erie | 0 | 69,602 | 222 | 116 | |
1927 | Clifford | | Washery | | 7 | | Luzerne | Clifford Coal Co. | 21,094 | Erie | 0 | 21,586 | 250 | 157 | |
1928 | Clifford | | Stripping | | 7 | | Luzerne | Clifford Coal Co. | 11,000 | Erie | 0 | 11,870 | 290 | 16 | Coal prepared by Kingston Coal Co. |
1928 | Clifford | | Washery | | 7 | | Luzerne | Clifford Coal Co. | 27,429 | Erie | 0 | 31,215 | 200 | 35 | Coal prepared from refuse of No. 9 and Underwood Collieries, Pennsylvania Coal Co. |
1929 | M&M | | Washery | | 7 | | Luzerne | M. & M. Coal Co. | 54,000 | Erie | 0 | 54,000 | 235 | 38 | |
1930 | Clifford | | Washery | | 7 | | Luzerne | M. & M. Coal Co. | 78,071 | Erie | 0 | 81,887 | 242 | 36 | |
1931 | M&M | | Washery | | 7 | | Luzerne | Clover Coal Co. | 22,843 | | 0 | 26,568 | 184 | 55 | |
1932 | M&M | | Washery | | 7 | | Luzerne | Clover Coal Co. | 69,525 | | 0 | 70,075 | 296 | 40 | Coal reclaimed from banks. |
1933 | M&M | | Washery | | 7 | | Luzerne | Clover Coal Co. | 10,300 | | 0 | 10,650 | 71 | | Coal reclaimed from banks. |
1933 | M&M | | Washery | | 7 | | Luzerne | Harrison Coal Co. | 35,539 | | 3,845 | 39,784 | 139 | 28 | Formerly Clover Coal Co. |
1934 | Clifford | | Washery | | 7 | | Luzerne | Harrison Coal Co. | 68,538 | | 3,722 | 72,770 | 309 | 37 | |
1935 | Clifford | | Washery | | 7 | | Luzerne | Harrison Coal Co. | 84,597 | | 0 | 85,757 | 290 | 24 | |