The Comstock showing lies within the Barkerville Terrane of the Omineca Belt. The Barkerville Terrane is in thrust contact with Triassic Quesnellia Terrane rocks to the west and Hadrynian to Lower Paleozoic Cariboo Terrane rocks to the east.
The Barkerville Terrane in this region is underlain by the dominantly metasedimentary rocks of the Hadrynian to Lower Paleozoic Snowshoe Group. In this area the Snowshoe Group comprises limestone, phyllite and quartzite. These rocks have been regionally metamorphosed to greenschist facies.
The showing is underlain by sheared quartzite and conglomerate in which quartz veins up to 10 metres wide occur. The veins are sparsely mineralized with galena and pyrite. Low gold values are reported. There is also a small seam, a few centimetres wide, of galena and sphalerite.
In 1932, the Moonlight and Comstock groups consisted of a number of claims owned by T. Riley and associates, of Wells. At this time it was reported that a 15 metre long adit was driven on the mineralized vein. About 75 metres away, a 5.4 metre shaft was in in existence.
In 1947, showings on the Ewa group, recorded in the name of Q. C. Heppner, of Wells, lie about 2.8 kilometres north-west of the meadows on lower Little Mustang Creek and are on a small unnamed north-flowing tributary of Big Valley Creek. The ground was held formerly as the Tyee and Comstoek groups, which were prospected and worked in 1933.
In 1987, several samples were collected by Poschner Construction west of Mustang Mountain near the old Moonlight occurrence. Only one yielded appreciable gold or silver. This was sample Addit 2 which assayed 92.9 grams per tonne silver (Assessment Report 16755).
Refer to Tom Mountain (093H 077) for related historical information.