The Uduk Lake epithermal gold-silver prospect is located on the Duk claims about 70 kilometres south-southwest of Burns Lake and 2 kilometres east of Uduk Lake. The claims were originally staked in 1980 by Amax Exploration and later allowed to lapse in 1981. They were restaked by A & M Exploration Limited in 1984.
The showing area is underlain by hydrothermally altered rhyolitic to dacitic flows, tuffs and breccias of the Eocene Ootsa Lake Group.
Outcrop on the property is sparse, however, bedrock is commonly within 1 or 2 metres of the surface. A porphyritic rhyolite with varying amounts of argillic alteration is the most common unit, while andesites of the Hazelton group and other granitic rocks occur in the northwestern and southwestern corner, respectively, of the claims. A zone of clay and silica-altered rhyolite in angular float and outcrop, measuring about 600 by 200 metres, occurs in the southwestern part of the property. Past exploration, including trenching and diamond drilling, focussed on a quartz-chalcedony (+/-pyrite) stockwork that locally grades into a more sulphide-rich, black matrix breccia. Hostrocks are typically moderately to intensely clay altered and locally moderately silicified. Pyrite is the only visible sulphide and is present in trace amounts ranging up to 5 per cent locally. It occurs mainly as fracture fillings and disseminations in vein, stockwork and breccia zones.
In 1984, geochemical sampling identified anomalous areas or molybdenum (up to 44 parts per million), silver (up to 3.6 parts per million), gold (up to 700 parts per billion), arsenic (up to 100 parts per million), lead (up to 68 parts per million) and zinc (up to 464 parts per million) in soil and rock (Property File - Rimfire Allen, D.G, 1984).
In 1981, Amax Exploration Ltd. carried out reconnaissance mapping and sampling in part of the originally staked area but allowed their claims to lapse. In 1984, the property area was re-staked by S. Travis. In 1985, Asitka Resource Corporation optioned part of the property and in 1986 conducted rock and soil geochemical sampling and 78 metres of Winkie drilling in three holes. Values ranged from 20 to 1450 parts per billion gold in quartz stringer stockwork zones intersected in drillholes.
Pacific Comox Resources Ltd. optioned the property from Travis in 1987 and, in 1988, sub-optioned to Chalice Mining Inc. Chalice conducted a program of line cutting, geological and geochemical surveys, an induced polarization geophysical survey and 358 metres of diamond drilling in five holes. Chalice did not exercise their option and the property reverted to Pacific Comox.
Pioneer Metals Corp. optioned the property in 1993 and carried out a soil geochemical program that year followed by further geochemical sampling, geological mapping and six mechanized trenches in 1994. All six trenches returned values greater than 0.1 gram per tonne gold with the whole 42 metres of TR-94-4 averaging 0.41 gram per tonne gold including six metres of 1.4 grams per tonne gold (Assessment Report 23154). Pioneer terminated its option in 1996. The trenching was completed about a kilometre northeast of the previous drilling that had occurred near/at the Uduk Lake showing.
In 1997, Atna Resource Ltd. purchased the property from Pacific Comox and optioned 60 per cent of the property to Gold Mountain Resources Ltd. Atna carried out a soil geochemical survey, geological mapping and an induced polarization geophysical survey in 1997 (Assessment Report 25136).
In 2011, Canarc Resource Corp. optioned the property from Atna and Dunn and carried out a soil geochemical and prospecting program. Subsequently, in 2012 and 2013, Canarc purchased 100 per cent of the property. In 2014, Canarc drilled 1149 metres of NQ core in three holes on the Windfall Hills property that contained the original Uduk Lake showing about 1 kilometre to the southwest. The 1149 metre drill program intersected 28 metres of 0.9 gram per tonne gold from 11 to 39 metres down hole in WH-14-03. A further 575 metres in parts of all three holes were anomalous (greater than 50 parts per billion gold) or highly anomalous (greater than 100 parts per billion gold) in gold (Assessment Report 35082). Generally, the top of all the holes were anomalous with values decreasing towards the bottoms. The 2014 drilling is located in the area of previous trenching.
In 2015, exploration work was conducted by B. Kreft and consisted of 10 vegetation (biogeochemical) samples, 11 rock samples and 29 C horizon soil samples.
In 2016, Canarc Resource Corp. completed a 3-D induced polarization survey covering an area of 3.8 square kilometres, about 10 per cent of the Windfall Hills property.