The HCM 1 occurrence is located near a small creek bed on the northern slopes of Mount Donaldson at elevation of 1425 metres. The Howe Copper occurrence is located approximately 300 metres to the south.

The area is predominantly underlain by biotite and hornblende-biotite granite of the Jurassic to Cretaceous Coast Plutonic Complex. Intruding these, and incorporating blocks of the biotite granite, is a sugary textured, fine to medium-grained, vuggy muscovite granite. Drusy quartz crystals often line the vugs. The muscovite granite has a potassium-argon age date of 83 million years (Late Cretaceous, (Geological Survey of Canada Open File 611). Locally, several linear outcrops occur, comprised of bedded lapilli tuff or tuffaceous rock striking northeast with moderate dips northwest.

Locally, a quartz vein zone hosts chalcopyrite and minor molybdenite mineralization. In 2006, a 0.5 metre grab sample (HC-JL-07) assayed 25 grams per tonne silver, 10.7 per cent copper and 0.064 per cent molybdenum (Assessment Report 29487).

The area has been explored in conjunction with the nearby Howe Copper (MINFILE 092GNW005) occurrence since its discovery in 1874 by Howe Sound Mining Company. In 1965, Bralorne Resources completed a program geological mapping, trenching, stripping and geochemical sampling on the area as the Zel Group. In 1967, Grasset Lake Mining completed approximately 750 metres of diamond drilling. No information regarding drilling results was reported. In 1972, Athena Mines completed a 72.0 line-kilometre airborne geophysical survey on the area as the Karen 1-16 claims. In 1980 and 1983, Seatac Resources completed programs of geological mapping, rock sampling and a 6 line-kilometre combined ground magnetic and electromagnetic survey on the area as the Anthony 1-8 claims. In 1988 and 1990, programs of prospecting, geological mapping and rock sampling were completed on the area as the CU 1-4 claims. In 2004, the area was prospected by Laird Exploration as the HC 1-4 claims for valuable quartz crystal specimens. In 2006, Copper Road Resources prospected the area.