The Overstall Northwest occurrence is located at an elevation of approximately 1930 metres on the north side of an east- to southeast-trending ridge, north of Menard Creek and approximately 14 kilometres southeast of the south end of Thorne Lake.

Regionally, the area is cut by a north-trending fault that separates andesitic rocks of the Upper Triassic Savage Mountain Formation (Takla Group) to the west from an undifferentiated package of Upper Triassic volcanics (Takla Group) to the east. Both volcanic packages are represented by aphanitic to porphyritic (feldspar) andesites. The undifferentiated volcanics are cut by a medium-grained gabbro with phenocrysts of plagioclase feldspar and pyroxene. The gabbro may be part of Upper Triassic ultramafic rocks that occur nearby.

The Savage Mountain volcanics are cut by northwest-trending pink porphyritic granodiorite dikes. These dikes contain hornblende and plagioclase phenocrysts in a matrix of quartz, plagioclase and orthoclase. Close to the faults, the matrix is chlorite altered. The dikes terminate against the north-trending fault. A 60-metre pyritic and propylitic envelope exists on either side of the fault. A serpentinite-altered zone is developed around the gabbro intrusion and is more pervasive near the fault. This serpentinization overlaps onto both sides of the fault and is fairly widespread near the mafic intrusion.

Locally, quartz±carbonate veins, up to 0.3 metre wide, with magnetite, pyrite, chalcopyrite, molybdenite and bornite cutting propylitically to weakly potassic-altered diorite and volcanics have been identified along an approximately 400 metre trend.

Work History

In 2021, Wedgemount Resources Corp. completed a program of geochemical (rock and soil) sampling and spectral analysis on the area as the regionally extensive Cookie property. Two grab samples (D704024 and D704025) from the occurrence assayed 3.02 and 14.80 per cent copper, 0.33 and 1.28 per cent molybdenite with up to 87.8 grams per tonne silver and 0.14 gram per tonne gold, whereas a grab sample (D704039) of a 0.1-metre-wide quartz-calcite-epidote vein with malachite staining from near a mountain peak, approximately 800 metres to the northwest, assayed 0.28 per cent copper, 4.3 grams per tonne silver and 0.45 gram per tonne gold (Assessment Report 40029).