The Twin 5 occurrence is located on a small ridge to the southwest of Gold Creek, approximately 7.5 kilometres northwest of its mouth on Lake Koocanusa.

The area is underlain by Proterozoic and Paleozoic sedimentary and volcanic rocks. Basaltic flows and volcaniclastics of the Helikian Nicol Creek Formation (Purcell Supergroup) outcrop sporadically, while siltstones, dolomites, and dolomitic quartzites of the Gateway Formation (Purcell Supergroup) are widespread. Quartzites of the overlying Phillips Formation (Purcell Supergroup) and fossiliferous limestones of the Upper Devonian Fairholme Group outcrop in the northeast. Roosville Formation (Purcell Supergroup) argillaceous dolomites also occur. Bedding generally strikes north-northwest with 30-to 40-degree dips to the northeast.

Locally, as identified by drilling, basalts and amygdaloidal flows host a zone of brecciation and alteration with mineralized quartz veins. The mineralization consists of coarse-grained pyrite with massive pyrrhotite and chalcopyrite.

In 1990, a diamond drill hole (G-90-01) intersected the following values (Assessment Report 19965B):

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Sample No.	From	To    	Length	Copper
             (m)    (m)    (m)    (%)
45361		155.3	155.6	 0.3	0.650
45362		155.6	155.9	 0.3	0.203
45364		156.2	156.6	 0.4	0.434
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WORK HISTORY

During 1988 through 1990, South Kootenay Goldfields completed a program of geological mapping, soil and stream sampling, 708.1 line-kilometres of combined airborne electromagnetic and magnetic surveys, a 9.0-line-kilometre ground induced polarization survey, and three diamond drill holes on the immediate area (Assessment Reports 19965, 21082, 21294).

In 2020, Aeonian Resources Ltd. conducted prospecting and rock sampling on their Koocanusa Project, including the MINFILE showings: Gold Creek (082GSW022), Twin 5 (082GSW090), Lilo (082GSW076), and Frankie (082GSW034) (Assessment Report 39692).

In 2021, Aeonian Resources Ltd., on their Koocanusa Project established a soil sampling grid from the Twin 5 showing (082GSW090) to the northwest for about 2 kilometres (Assessment Reports 39966). A total of 98 soil samples were collected and sent for analysis. Soil sampling on the grid revealed a 720-metre copper-in-soil anomaly. Results from the grid returned up to 288 parts per million copper (0.03%). This grid corresponds with the area geologically mapped and covered by 10 kilometres of ground magnetics during the same time period. Rock sampling was done sporadically over about 2 kilometres from Twin 5 to the northwest. In total, 48 samples were collected from across the property. Results returned from trace to 0.1 per cent copper, with the highest copper values originating from siltstone and dolomitic rocks collected in the road cut along the soil trend, north of the Twin 5 showing. Results from the mag survey showed the Nicol Creek basalt as a magnetic “high” along the southwestern edge of the survey grid. An anomalous magnetic high “ridge” strikes northwest to southeast which aligns with the copper trend picked up in rocks and soils.