The CGZ occurrence is underlain by undivided volcanic rock of the Upper Triassic Stuhini Group. In 2019, detailed prospecting by Colorado Resources Ltd was conducted on the CGZ, which is located two kilometres south of the "Castle – Saddle Trend". Work has outlined two intersecting trends at the CGZ, 2.2 kilometres and 2.7 kilometres in length. Twenty-one out of seventy grab bedrock and float samples collected in 2019 yielded greater than 1 per cent copper. Assayed ranged from 0.01 to 5.79 per cent copper, nil to 7.83 grams per tonne gold, and 0.2 to 145 grams per tonne silver (Press Release, Colorado Resources Ltd., December 9, 2019). The area is mostly scree-covered with limited outcrop. Mineralization is comprised of quartz-carbonate-chalcopyrite veins, veinlets and stockworks, ranging from a few centimetres to 2 metres in width, that cut a variety of volcanic and sedimentary rocks. The northern CGZ trend is associated with a prominent magnetic low. The CGZ target has never been drilled or trenched.

See Castle (104G 076) for details of the Castle property geology and history.