The Hed prospect is on the south side of the Similkameen River, about 5.3 kilometres west of Hedley.
The deposit is underlain by rocks from the Whistle Creek Formation, which is divisible into three stratigraphic sequences, with the oldest being well-bedded massive tuffs of andesitic to basaltic composition. Higher in the unit, ash tuffs with minor lapilli tuffs and volcanic breccias predominate.
A carbonate-quartz breccia vein cuts argillite, tuff and chert in the lower Whistle Creek Formation. Fine-grained to coarse porphyritic diorite dykes of the Hedley Intrusive suite crosscut the strata and locally contain disseminated pyrite and arsenopyrite. The vein strikes 158 degrees, dips vertically and is up to 15 metres wide (core length). Diamond drilling has traced the vein over a strike length of 55 metres. The vein is comprised of graphitic argillite clasts in a matrix of carbonate and quartz.
The breccia commonly contains 1 to 5 per cent disseminated pyrite, with occasional massive pyrite sections up to 15 centimetres in width. Minor black sphalerite occurs in areas with 3 to 20 per cent coarse pyrite. Gold values encountered in drilling varied up to 3.4 grams per tonne over 0.6 metre (Assessment Report 6060, page 17, hole 1-76, 16.8 to 17.4 metres). A grab sample of leached gossan developed over the vein assayed 70.15 grams per tonne gold (Assessment Report 6060, page 17).
The deposit was discovered by Canadian Occidental Petroleum Ltd. in 1976. The company completed soil and geological surveys, and drilled three holes totalling 244 metres.