Clifford
(M&M)
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YearOperation NameNumberTypeOpeningDistrictCityCountyCompany NameRailroad Shipments (tons)Railroad to MineTruck Shipments (tons)Total Production (tons)Days WorkedEmployeesNotes
1923Clifford Washery8 LuzerneClifford Coal Co.16,742Erie017,5166141 
1924Clifford Washery8 LuzerneClifford Coal Co.34,207Erie034,20720822 
1925Clifford Washery8 LuzerneClifford Coal Co.28,950Erie9,32029,90917065 
1926Clifford Washery8 LuzerneClifford Coal Co.65,602Erie069,602222116 
1927Clifford Washery7 LuzerneClifford Coal Co.21,094Erie021,586250157 
1928Clifford Stripping7 LuzerneClifford Coal Co.11,000Erie011,87029016Coal prepared by Kingston Coal Co.
1928Clifford Washery7 LuzerneClifford Coal Co.27,429Erie031,21520035Coal prepared from refuse of No. 9 and Underwood Collieries, Pennsylvania Coal Co.
1929M&M Washery7 LuzerneM. & M. Coal Co.54,000Erie054,00023538 
1930Clifford Washery7 LuzerneM. & M. Coal Co.78,071Erie081,88724236 
1931M&M Washery7 LuzerneClover Coal Co.22,843026,56818455 
1932M&M Washery7 LuzerneClover Coal Co.69,525070,07529640Coal reclaimed from banks.
1933M&M Washery7 LuzerneClover Coal Co.10,300010,65071 Coal reclaimed from banks.
1933M&M Washery7 LuzerneHarrison Coal Co.35,5393,84539,78413928Formerly Clover Coal Co.
1934Clifford Washery7 LuzerneHarrison Coal Co.68,5383,72272,77030937 
1935Clifford Washery7 LuzerneHarrison Coal Co.84,597085,75729024