The Boulder area is underlain by rock of the Devonian Stikine Assemblage consisting of bedded limestone and mafic volcanics intruded by small mafic sills and dikes.

The bedrock geology in the Boulder area was mapped and 12 rock samples were taken as part of the 2007 program of Roca Mines. The local geology consists of bedded limestone and mafic volcanics intruded by narrow mafic sills and dykes. The mineralization is confined to the limestone and is characterized by thin, conformable, ankerite-altered horizon and associated dilatational quart-carbonate veins. The mineralized horizon is shallow dipping and was traced for over 100 metre.

Sample 672006 (taken in 2007) consisted of ankerite altered limestone containing 3 to 4 per cent disseminated pyrite, chalcopyrite, galena and sphalerite. This sample assayed 13.2 grams per tonne gold, 8.6 grams per tonne silver, greater than 10,000 parts per million lead (greater than 1 per cent), 0.31 per cent copper and 0.17 per cent zinc (Assessment Report 29475).

In 2019, Sassy Resources Corp. completed a program of prospecting, geological mapping and geochemical sampling on the area as part of the Foremore property. Four select grab samples (B0020951 through B0020954) yielded from 2.77 to 35.9 grams per tonne gold, 5.2 to 14.4 grams per tonne silver, 0.30 to 1.29 per cent copper, 0.05 to 4.31 per cent zinc and 2.13 to 9.08 per cent lead (Sassy Resources Corporation [2019-12-31]: Amended Independent Technical Report - Foremore Au-Ag-Cu-Zn-Pb Property, British Columbia).

See Foremore (104G 148) for details on the Foremore property and SG (104G 181) for more recent work history details of the Foremore property.