The Copper Basin showings are located in a cirque 2 kilometres northwest of Thoen Peak.

The area is underlain by clastic sedimentary rocks of the Middle Jurassic to Lower Cretaceous Bowser Lake Group, intruded by granodioritic rocks of the Late Cretaceous Bulkley Intrusions (Geological Survey of Canada Open File 2322).

The showings are described as disseminated chalcopyrite mineralization in fracture zones in a granodiorite dike cutting sedimentary rocks. The fracturing trends 045 degrees. Although there are several showings, continuity of mineralization is reported as poor.

One 60-centimetre sample, taken from a 1.5 metre wide mineralized zone, assayed 7.1 per cent copper, 1.7 grams per tonne gold and 48.0 grams per tonne silver (Minister of Mines Annual Report 1929, page C161).

In 2011, the Crater Lake grid MMI soil sampling survey of Xander Resources revealed a significant molybdenum-copper-gold-silver-zinc anomaly with additional values in lead, arsenic, cadmium, cobalt, and nickel. The size of the anomaly is a minimum 900 meters in an east-west direction with it being open to the east, and a minimum 350 meters in a north-south direction with it being open to the south. Characteristics of this anomaly suggest it is caused by a calc-alkalic porphyry copper-molybdenum-gold type system. The grid is just north of the plotted location of the Copper Basin showing which was based on vague locational description.

Just south of the plotted location of the Copper Basin showing is the 2011 DBZ rock-chip sample grid. The DBZ grid sampling was conducted on an east-west trending ridge about 1000 meters to the south of the DH grid. The area is underlain by variably honfelsed metasediments in close contact to the quartz-monzonitic Mount Thoen stock. Seventeen 5-metre chip samples were taken along five north trending lines. Although the DBZ ridge appears strongly gossanous and is along strike with the copper-molybdenum-gold anomaly discussed on the DH-Grid, sampling revealed no metal anomaly of any extent.

Refer to Hot (093M 124) for details of the work history Copper Basin/Crater Lake area.