| 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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| 1938 | Prohaska | | Mine | | 12 | Plymouth 1 | Luzerne | Robert Prohaska | 0 | | 0 | 2,224 | 123 | 6 | Lessee, part of Lance Colliery. Coal shipped run of mine to Kingston No. 4 Breaker. | | 1939 | Prohaska | | Mine | | 12 | Plymouth 1 | Luzerne | Robert Prohaska | 0 | | 0 | 156 | 17 | 5 | Lessee, part of Lance Colliery. Coal shipped run of mine to Kingston No. 2 Breaker. |
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