| 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 |
|---|
| 1949 | Mountain Slope | | Mine | Slope | 5 | Ransom Twp. | Lackawanna | Mountain Slope Coal Co. | 6,045 | | 617 | 8,658 | 198 | 17 | Run by Joe Keating, operation was located just above the Old Forge-Ransom Twp line, 100 yds to the right of the St. Michaels Holy Cross Cemetery. Coal prepared at Morgan and Kinz breakers. |
| 1950 | Mountain Slope | | Mine | Slope | 5 | Ransom Twp. | Lackawanna | Mountain Slope Coal Co. | 10,972 | | 582 | 12,148 | 224 | 16 | Coal prepared at Waddell and Supreme breakers. |
| 1951 | Mountain Slope | | Mine | Slope | 5 | Ransom Twp. | Lackawanna | Mountain Slope Coal Co. | 5,584 | | 1,394 | 8,754 | 159 | 20 | Coal prepared at Pompey, Waddell, Ace, Mt. Alden, Morgan, Russell and Capone breakers. |
| 1952 | Mountain Slope | | Mine | Slope | 5 | Ransom Twp. | Lackawanna | Mountain Slope Coal Co. | 3,162 | | 3,516 | 8,680 | 179 | 18 | Coal prepared at Ace, Morgan and Russell breakers. |
| 1953 | Mountain Slope | | Mine | Slope | 5 | Ransom Twp. | Lackawanna | Mountain Slope Coal Co. | 809 | | 4,448 | 7,390 | 210 | 19 | |
| 1954 | Mountain Slope | | Mine | Slope | 5 | Ransom Twp. | Lackawanna | Mountain Slope Coal Co. | 1,312 | | 2,138 | 5,166 | 234 | 18 | Also labeled as (Keating's) in report. Coal prepared at multiple breakers. |
| 1955 | Mountain Slope | | Mine | | 5 | Ransom Twp. | Lackawanna | Mountain Slope Coal Co. | 3,581 | | 1,991 | 8,466 | 245 | 17 | Also labeled as (Keating's) in report. Coal prepared at Morgan, Ace and Simpson breakers. |
| 1956 | Mountain Slope | | Mine | | 5 | Ransom Twp. | Lackawanna | Mountain Slope Coal Co. | 3,467 | | 1,860 | 7,664 | 257 | 14 | Coal prepared at Morgan, Ace DeAngelis and Northwest breakers. |
| 1957 | Mountain Slope | | Mine | | 5 | Ransom Twp. | Lackawanna | Mountain Slope Coal Co. | 5,812 | | 6,283 | 14,250 | 248 | 14 | Coal prepared at Northwest and Ace breakers. |
| 1958 | Mountain Slope | | Mine | | 5 | Ransom Twp. | Lackawanna | Mountain Slope Coal Co. | 5,141 | | 1,888 | 11,401 | 188 | 14 | Called Sibley Mountain Slope. Coal prepared at Ace and Northwest breakers. |
| 1959 | Sibley Mountain Slope | | Mine | | 5 | Ransom Twp. | Lackawanna | Mountain Slope Coal Co. | 4,719 | | 1,647 | 11,361 | 140 | 15 | Coal prepared at Ace and Northwest breakers. |
| 1960 | Sibley Mountain Slope | | Mine | | 5 | Ransom Twp. | Lackawanna | Mountain Slope Coal Co. | 5,317 | | 4,472 | 12,360 | 208 | 15 | Coal prepared at multiple breakers. |
| 1961 | Sibley Mountain Slope | | Mine | | 2 | Ransom Twp. | Lackawanna | Mountain Slope Coal Co. | 6,273 | Truck 1 | 3,930 | 14,244 | 247 | 16 | Coal prepared at Ace, Raymond and Bel Air breakers. |
| 1962 | Sibley Mountain Slope | | Mine | | 2 | Ransom Twp. | Lackawanna | Mountain Slope Coal Co. | 858 | | 1,645 | 7,152 | 105 | 17 | Coal prepared at Ace, Raymond and Bel Air breakers. |
| 1963 | Sibley Mountain Slope | | Mine | | 3 | Ransom Twp. | Lackawanna | Mountain Slope Coal Co. | 5,987 | | 4,592 | 12,825 | 229 | 14 | Coal prepared at Bel Air, Harry E. and Dicksville breakers. |
| 1964 | Sibley Mountain Slope | | Mine | | 3 | Ransom Twp. | Lackawanna | Mountain Slope Coal Co. | 0 | Truck 1 | 7,702 | 7,702 | 231 | 16 | Coal prepared at Bel Air Breaker. |
Note 1: Added, does not appear in the mine inspection report.