| 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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| 1919 | Robertson | | Washery | | 1 | | Lackawanna | Robertson Coal Co. | 132,597 | NYO&W | 0 | 133,030 | 184 | 83 | | | 1920 | Robertson | | Washery | | 1 | | Lackawanna | Robertson Coal Co. | 175,962 | NYO&W | 0 | 176,623 | 276 | 81 | | | 1921 | Robertson | | Washery | | 1 | | Lackawanna | Robertson Coal Co. | 37,761 | NYO&W | 0 | 37,877 | 103 | 80 | | | 1922 | Robertson | | Washery | | 1 | | Lackawanna | Robertson Coal Co. | 22,867 | NYO&W | 0 | 25,082 | 95 | 40 | |
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