The Riverside showings are underlain by chert breccia of the Devonian to Permian Harper Ranch Group. The breccia is grey-green and composed of fragments of argillite, chert and quartzite in a siliceous matrix. The fragments are usually 5 to 50 millimetres in diameter, although larger fragments are occasionally found. A large shear zone cuts across the property and consists of rusty, sheared material and is at least 240 metres long and 50 metres wide. Other rock types in the vicinity of the showings include Harper Ranch group argillite, quartzite and limestone.
Quartz veins and stringers occur within the shear zone and are mineralized with pyrite and minor amounts of chalcopyrite, galena, tetrahedrite, malachite and azurite. Generally the veins are discontinuous and strike easterly with moderate dips (33-55 degrees) to the south. In several places the quartz veins form a stockwork. Wallrock is usually silicified. The quartz vein and stringer stockwork zones are up to 2 metres wide with individual veins up to 1 metre wide. In 1981, a chip sample across 1.6 metres of quartz vein stockwork in a roadcut yielded 2.8 grams per tonne gold and 27.0 grams per tonne silver (Assessment Report 9558).
Previous work includes numerous opencuts, pits, trenches, a 13.7-metre shaft and 45.7-metre adit.
In 1913, the Kamloops Goldfields claim group was owned by the Gold Security Company of Kamloops and a shaft sunk and adit driven. The Riverside claim, owned by E.T. Batchelor, is a restaking of a part of the Kamloops Goldfields claim group. In 1936, it was prospected by D.B. Sterritt and associates, of Kamloops, and about 2.7 tonnes of ore averaging 17.1 grams per tonne was shipped to the Trail smelter. The property was worked under lease by G.F. Dickson of Kamloops during the winter of 1940-41, and about two carloads of ore were sorted and shipped. It is understood that this assayed 12.6 grams per tonne gold and 102.8 grams per tonne silver (Geological Survey of Canada Memoir 249). In 1975, geological mapping was conducted on the Mac claim on behalf of McLeod Copper Limited. In 1978-79, a reconnaissance soil (55) geochemical survey and eight percussion-drill holes totalling 309.4 metres were completed over part of the Mac claim on behalf of West Provident Resources Ltd. In 1980-81, geological mapping was conducted on the Mac claim on behalf of J. Kruzick. In 1990, 44 kilometres of grid was established and 30.2 kilometres of VLF-EM and magnetometer surveys were completed on the Harp claims on behalf of Brera Holdings.
