The Tom MacKay occurrence is located at an elevation of approximately 1150 metres on a northeast-facing slope, approximately 2.4 kilometres east of Tom MacKay Lake.

The area is underlain by andesitic volcanic rocks of the Lower Jurassic Hazelton Group and sedimentary rocks of the Middle to Upper Jurassic Bowser Lake Group. The Hazelton Group strata has been locally intruded by feldspar porphyritic rocks of Lower Jurassic Eskay porphyry.

Locally, a felsite (Eskay Rhyolite) hosts gold and silver values.

Work History

The area has been explored in conjunction with the nearby Eskay Creek (MINFILE 104B 008) mine and a completed regional exploration history can be found there. A historical adit, referred to as the MacKay adit, is reported in the area.

In 2019, Skeena Resources completed a minor prospecting and sampling program and two diamond drill holes on the area as part of the Eskay Creek project. Five samples (409405, 409327, 409362, 409303 and 409660) of rhyolite yielded values from 2.4 to 13.5 grams per tonne gold and 15 to 404 grams per tonne silver (SRK Consulting (Canada), Inc. [2021-05-21]: Independent Technical Report on the Eskay Creek Au-Ag Project, Canada).

The following year, a three-dimensional resistivity and induced polarization survey was completed on the property.