| 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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| 1936 | Dauphin | | Colliery | | 12 | | Luzerne | Dauphin Mining Co. | 2,887 | | 0 | 5,178 | 116 | 27 | | | 1937 | Dauphin | | Washery | | 12 | | Luzerne | Dauphin Mining Co. | 350 | | 0 | 3,900 | 38 | 8 | | | 1938 | Dauphin | | Washery | | 12 | | Luzerne | Dauphin Mining Co. | 1,760 | | 0 | 3,835 | 61 | 8 | |
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