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Mountain Slope Coal Co.
(Mowry & Wilson Coal Co.)
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YearOperation NameNumberTypeOpeningDistrictCityCountyCompany NameRailroad Shipments (tons)Railroad to MineTruck Shipments (tons)Total Production (tons)Days WorkedEmployeesNotes
1905 Mowry CollieryDrift (2)2 LackawannaMowry & Wilson Coal Co.005,62319323 
1949 Mountain Slope MineSlope5Ransom Twp.LackawannaMountain Slope Coal Co.6,0456178,65819817Run 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 MineSlope5Ransom Twp.LackawannaMountain Slope Coal Co.10,97258212,14822416Coal prepared at Waddell and Supreme breakers.
1951 Mountain Slope MineSlope5Ransom Twp.LackawannaMountain Slope Coal Co.5,5841,3948,75415920Coal prepared at Pompey, Waddell, Ace, Mt. Alden, Morgan, Russell and Capone breakers.
1952 Mountain Slope MineSlope5Ransom Twp.LackawannaMountain Slope Coal Co.3,1623,5168,68017918Coal prepared at Ace, Morgan and Russell breakers.
1953 Mountain Slope MineSlope5Ransom Twp.LackawannaMountain Slope Coal Co.8094,4487,39021019 
1954 Mountain Slope MineSlope5Ransom Twp.LackawannaMountain Slope Coal Co.1,3122,1385,16623418Also labeled as (Keating's) in report. Coal prepared at multiple breakers.
1955 Mountain Slope Mine5Ransom Twp.LackawannaMountain Slope Coal Co.3,5811,9918,46624517Also labeled as (Keating's) in report. Coal prepared at Morgan, Ace and Simpson breakers.
1956 Mountain Slope Mine5Ransom Twp.LackawannaMountain Slope Coal Co.3,4671,8607,66425714Coal prepared at Morgan, Ace DeAngelis and Northwest breakers.
1957 Mountain Slope Mine5Ransom Twp.LackawannaMountain Slope Coal Co.5,8126,28314,25024814Coal prepared at Northwest and Ace breakers.
1958 Mountain Slope Mine5Ransom Twp.LackawannaMountain Slope Coal Co.5,1411,88811,40118814Called Sibley Mountain Slope. Coal prepared at Ace and Northwest breakers.
1959 Mountain Mine7 LuzerneMountain Slope Coal Co.001,2531254Mine employing less than five persons.
1959 Sibley Mountain Slope Mine5Ransom Twp.LackawannaMountain Slope Coal Co.4,7191,64711,36114015 Coal prepared at Ace and Northwest breakers.
1960 MountainNo. 1MineSlope7 LuzerneMountain Slope Coal Co.0Truck 11,2201,234575Coal prepared at Glen Lyon Breaker.
1960 Mountain Mine7 LuzerneMountain Slope Coal Co.00000Mine employing less than five persons.
1960 Sibley Mountain Slope Mine5Ransom Twp.LackawannaMountain Slope Coal Co.5,3174,47212,36020815Coal prepared at multiple breakers.
1961 MountainNo. 1Mine7 LuzerneMountain Slope Coal Co.483120804875Mining discontinued during September 1961. Coal prepared at Bel Air Breaker.
1961 Sibley Mountain Slope Mine2Ransom Twp.LackawannaMountain Slope Coal Co.6,273Truck 13,93014,24424716Coal prepared at Ace, Raymond and Bel Air breakers.
1962 Mountain Mine11 LuzerneMountain Slope Coal Co.00000Mining discontinued during September 1961. Coal prepared at Bel Air Breaker.
1962 Sibley Mountain Slope Mine2Ransom Twp.LackawannaMountain Slope Coal Co.8581,6457,15210517Coal prepared at Ace, Raymond and Bel Air breakers.
1963 Sibley Mountain Slope Mine3Ransom Twp.LackawannaMountain Slope Coal Co.5,9874,59212,82522914Coal prepared at Bel Air, Harry E. and Dicksville breakers.
1964 Sibley Mountain Slope Mine3Ransom Twp.LackawannaMountain Slope Coal Co.0Truck 17,7027,70223116Coal prepared at Bel Air Breaker.
1965 Sibley Colliery10Old ForgeLackawannaMountain Slope Coal Co.413205341816Abandoned during 1965. Coal prepared at Bel Air Breaker.

Note 1: Added, does not appear in the mine inspection report.

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