High level quartz phyric, felsitic intrusive rocks of the Paleocene to Eocene Sloko-Hyder Plutonic Suite intrudes granites of the same plutonic suite (an earlier phase). A northwest trending contact separates the stock from rhyolite, dacite, trachyte and pyroclastic to the east. A northwest trending contact separates the 3 kilometre wide quartz-feldspar porphyry Sloko Hyder stock from rhyolite, dacite, trachyte and pyroclastic rock of the Early Eocene Sloko Group, to the east.

The rhyolite is strongly brecciated and contains disseminated and fracture filled pyrite. The porphyry also contains pyrite. Minor occurrences of chalcopyrite and malachite are reported in the porphyry. Within the rhyolite, a 10 centimetre wide chalcedonic, brecciated quartz vein with minor limonite and manganese oxide stain assayed 4.2 grams per tonne silver and 0.78 grams per tonne gold (Assessment Report 14365).

Souther (1971) in (Geological Survey of Canada Memoir 362) indicates a copper occurrence in the Whiting Lake area.

The Tess 1-32 claims were staked for NRD Mining Ltd. in 1972. Work during 1973 included a geochemical soil survey (190 samples) on the westerly claims, and 35 rock samples collected from irregularly spaced sites on the easterly claims. No significant copper mineralization was located.

In 1984, Noranda Exploration Company staked the ground. Limited rock, soil and silt sampling was done. Anomolous gold values (to 780 ppb Au) were obtained from limonite stained quartz veins and zones of silicification (Assessment Report 14365). Further work was recommended but none is reported.

In 1989, Equity Silver Mines Ltd. conducted an exploration program consisting of geological mapping, sampling and reconnaissance geochemistry. The most striking feature of the claim area is the 1 km wide band of gossanous alteration. This zone locally occurs within the Sloko volcaniclastics but trends north - northeast to beyond this lithology. From the air the zone can be seen to dip 25 degrees east. Within the zone argillic to advanced argillic alteration consists of varying combinations of sericitization, silicification, kaolinization and pyritization. No anomolous values were obtained from the samples except for highly elevated phosphorous

Within the rhyolite, a 10 centimetre wide chalcedonic, brecciated quartz vein with minor limonite and manganese oxide stain assayed 4.2 grams per tonne silver and 0.78 grams per tonne gold (Assessment Report 14366).