The area of West Windy is underlain by Upper Triassic calc-alkaline volcanic rocks of the Takla Group.
A 1990 trenching program by Placer Dome located a mineralized boulder train in ferricrete measuring 25 metres wide by 55 metres long and up to 5 metres thick (Assessment Report 21430). Mineralized boulders reportedly vary in size up to 30-40 centimetres in diameter and consist of massive pyrrhotite with varying amounts of chalcopyrite, arsenopyrite, sphalerite and pyrite. One sample yielded 32.17 grams per tonne gold, 1.8 per cent copper, 30.0 grams per tonne silver and 14.5 per cent arsenic (Assessment Report 21430).
Sampling of the trenches yielded values of up to 0.875 gram per tonne gold and 0.210 per cent copper over 5.2 metres of intensely altered and foliated andesite and 6.010 grams per tonne gold with 0.440 per cent copper over 1.3 metres of a faulted gouge zone in trench TR90-02. Additional trench sampling yielded 0.185 gram per tonne gold with 0.084 per cent copper over 8.0 metres of fractured quartz diorite, including 1.56 gram per tonne gold with 0.330 per cent copper over 2.5 metres, along with two separate sections yielding 1.13 and 2.36 grams per tonne gold over 1.2 and 0.3 metres, respectively, in trench TR90-06 (Assessment report 21430).
Also in 1990, two diamond drill holes (90-5 and 90-6), located approximately 600 metres north-northeast of the West Windy occurrence, yielded intercepts including 0.175 and 0.240 gram per tonne gold over 5.9 and 4.3 metres, respectively, in hole 90-5, and 0.145 and 0.191 gram per tonne gold over 5.0 and 11.4 metres, respectively, in hole 90-6 (Assessment report 21430).
A 1996 diamond drill hole (Assessment Report 21430), angled northerly beneath the mineralized boulder train, intercepted 20.43 metres grading 0.080 gram per tonne gold and 0.076 per cent copper (as reported in Assessment Report 30194). The hole encountered diorite with minor silicified zones and mylonite. Sulphides are dominantly disseminated pyrite with a trace of chalcopyrite and molybdenite. The hole is weakly anomalous in gold and copper. No massive sulphide was encountered except for a 15-centimetre band of semi-massive pyrite. The source of the mineralized boulders has not been located.
In 2004, a second zone of massive sulphide boulders was identified, approximately 1 kilometre to the north of the West Windy occurrence. Two samples (R121 and R122) from the boulders yielded values up to 0.287 per cent copper, 9.5 grams per tonne silver and 1.3 grams per tonne gold (Assessment Report 28025).
In 2008, drillhole 08-05, located on the West Windy occurrence area, intercepted a foliated diorite hosting quartz-sulphide veins and/or seams of massive pyrite and chalcopyrite yielding values of 0.810 gram per tonne gold over 3.0 metres (35.7 to 38.7 metres down hole), 0.219 per cent copper and 0.255 gram per tonne gold over 0.9 metre (96.2 to 97.3 metres down hole), 0.326 per cent copper and 0.557 gram per tonne gold over 0.6 metre (118.8 to 119.4 metres down hole) and 0.125 per cent copper with 2.271 grams per tonne gold over 0.5 metre (127.1 to 127.6 metres down hole; Assessment Report 30754).
In 2016, samples of semi-massive to massive sulphide float boulders yielded up to 1.81 grams per tonne gold, 12.5 grams per tonne silver and 0.361 per cent copper (Assessment Report 36209).
Refer to Windy (093J 024) for a discussion of the common work history.
