The Ground Hog underground mine consists of several levels connected by raises and winzes, plus stoped areas where larger veins and kidneys or pods of granite were mined. The mine was developed with four main levels, in descending sequence these are the: Smith, Dubie, Hoy and Antelope. In addition, there are small open cuts referred to as the Ground Hog surface pit and Ground Hog East pit. More recent entries were developed northwest of the Ground Hog complex and are called the Sage and Badger adits.

A total of more than 2,350 tons (2,130 tonnes) of graphite was mined and sold from the workings from 1902 to 1948, mostly during WW-I and WW-II as the demand for steel rose and supply from Ceylon was cut off to the U.S. The adits and tunnels total in excess of 3,500 feet (1,070 m). This gives a calculated ore grade of more than 15% Cg.

Inspection of the USGS mine maps reveal the width and depth of the graphite occurrence within the Ground Hog mine complex. True-width of the ore body where the graphite was exposed by tunneling is estimated to be 164 ft (50 m) and has been found and mined to a depth of 330 ft (100 m).

As shown on the Land page, in addition to the previously-mined occurrences of graphite at the Ground Hog mine complex located at the south-western portion of the property, graphite was also mined at the Bird's Nest adits located in the south-central part of the property. Flake and vein graphite has also been observed at surface at the south-eastern portion of the property. When all observed occurrences of graphite are combined, the deposit is potentially nearly 2 miles (3 km) in length.