The Girard Mammoth Colliery was located north of Girardville on the Raven Run Creek.
The
colliery was opened by a drift driven east on the north dip skidmore vein by
John and Frank Donaldson in 1856. They mined the drift to 1864 when a company
was formed by Messrs. Donaldson, Shoener, Tyler and Amrod who developed and
operated the colliery under the name of the Girard Mammoth Coal Company.
In 1865 they drove a water level tunnel 725 ft. north to the south dip skidmore vein and drove gangways eastward 1500 ft. and westward 3000 ft. by 1869. In 1867 a second tunnel was driven 2000 ft. west of the water level tunnel from the skidmore vein to the mammoth vein intersecting a number of small veins.
The first coal shipped by the new company was 4057 tons in 1866.
In 1871 they sunk a slope 400 ft. on the south dip skidmore vein.
The Mammoth Vein Coal Co. continued operating the colliery until 1879 when it was purchased by the Philadelphia & Reading Coal & Iron Co. (P&R C&I Co.) who, in 1882, sunk a new slope 480 ft. on the south dip buck mountain vein and erected new hoisting machinery and boilers to operate it.
In 1895 the water in the old abandoned cuyler colliery workings was pumped out in connection with their other slopes. The P&R C&I Co. continued operating to 1906 when the James Brothers came in possession and operated to 1908 when succeeded by Cockel, Christ and Company. They made many improvements and built a large new breaker that was destroyed by fire in 1912, but the company rebuilt the same year. They continued operating the colliery to 1918 when the Raven Run Coal Company (Wentz and Company) leased the colliery and operated it under the name of the Raven Run Colliery to 1923 when they were succeeded by the Hazle Brooke Coal Company.
The total shipments of coal from Girard Mammoth Colliery were 5,951,349 tons as of 1928.