The region is underlain by (?)Hadrynian to Paleozoic Snowshoe Group rocks, which occur within the Barkerville Terrane of south-central British Columbia. These metasedimentary rocks consist primarily of marble, quartzite and phyllite which in the area of the Pittman showing comprise the Downey succession (informal name). Metamorphism of the region varies from chlorite grade to sillimanite and higher. The lode gold deposits of the region occur in rocks metamorphosed no higher than greenschist facies.

The showing is underlain by limestone in which replacement veins, probably structurally controlled, containing galena, sphalerite and pyrite occur. A grab sample containing abundant galena and sphalerite assayed 34.9 per cent zinc, 4.9 per cent lead and 37.69 grams per tonne silver (Minister of Mines Annual Report 1947, page A115).

In 1996, exploration on the Nugget Mountain mineral property comprised geological mapping of about 3 square kilometres across the western portion of the property. A total of 129 soil samples and 49 rock samples were collected. The Pittman showing is located within a 1 kilometre radius of several showings (Gisco (093A 052), Zone (093A 055)) that were explored along Antler Creek in the 1930s and 1940s, near the mouths of Nugget Gulch and Victorian Creek. In 1987, Rise Resources Inc. completed 419 kilometres of helicopter-borne magnetic and VLF-EM survey over their block of claims which covered the Pittman showing. In 2005, a total of 43 samples (9 soil, 1 moss mat silt and 33 rock) were taken on the Nugget Mountain project claims, which covers the showing, on behalf of claim owners R.J. Menard and G.J. Newell.