| 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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| 1955 | Four-M | | Mine | | 2 | Peckville 2 | Lackawanna | Four-M Coal Co. | 0 | | 0 | 2,418 | 195 | 4 | Mine employing less than five persons. | | 1956 | Four-M | | Mine | | 2 | | Lackawanna | Four-M Coal Co. | 1,020 | | 1,646 | 4,186 | 231 | 9 | Discontinued operation in May 1956. Coal prepared at Ace Breaker. |
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