| 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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| 1939 | Costango | | Mine | | 6 | Dunmore 1 | Lackawanna | Costango Coal Co. | 8,643 | | 0 | 8,643 | 47 | 31 | Part of mine operated by Harper Coal Co. | | 1940 | Costango | | Mine | | 6 | Dunmore 1 | Lackawanna | Costango Coal Co. | 3,513 | | 1,505 | 5,018 | 90 | 23 | Part of mine operated by Harper Coal Co. | | 1941 | Costango | | Mine | | 6 | Dunmore 1 | Lackawanna | Costango Coal Co. | 1,488 | | 0 | 2,126 | 65 | 6 | Part of mine operated by Harper Coal Co. |
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