The GC 1 occurrence is located on the northern slopes of Mount Porter, approximately 4 kilometres northeast of Doran Lake.

The area is primarily underlain by Upper Triassic Karmutsen Formation (Vancouver Group) massive basalt, pillow basalt, pillow basalt breccia, lapilli tuff, a volcanic sediment unit and an occasional feldspar porphyry dike.

Locally, quartz-carbonate altered basalts and tuffs host fine quartz and pyrite veins. A 7 metre chip sample (76304) assayed greater than 0.2 per cent mercury, but had low gold and silver values (Assessment Report 15354).

In 1986, the area was prospected by R.J. Bilquist as the GC 1-2 claims.