"One of the most important mineral trends of northwestern British Columbia extends from near the town of Stewart north to the Treaty Glacier" - Nelson / Kyba, British Columbia Geological Survery, Ministry of energy and Mines 2014
The Dunwell package of claims lies within this mineral trend.
The Dunwell mine produced 45,657 tonnes averaging 6.63 grams per tonne gold, 223.91 grams per tonne silver, 1.83 per cent lead, 4.01 per cent zinc and 0.056 per cent copper (gold equivalent of 13.3 g/t or $500/t rock using Sept, 2016 prices).
Recent drilling has shown potential to develop more reserves.
Excellent logistics: low-elevation, road accessible, 8km from Stewart.
The 850 hectare Dunwell property is part of a highly strategic package of mineral claims acquired by American Creek in 2016. The three contiguous properties (Bear River, Dunwell, Silvershot) now spans some 1,560 hectares covering a significant portion of the heavily mineralized Portland Canal Fissure Zone which lies in "One of the most important mineral trends of northwestern British Columbia extending from near the town of Stewart north to the Treaty Glacier" - Nelson / Kyba, British Columbia Geological Survey, Ministry of Energy and Mines, 2014.
Collectively the properties contain close to two dozen main showings of high-grade gold, silver, lead, zinc and copper. Of these, over half have been explored underground and 7 or 8 have shipped ore, the most significant of which is the Dunwell Mine. Other producing claims within the property such as the Ben Ali, Little Wonder, George E, Sunbeam, Lakeview, Main Reef, Mayflower, and Tyee had their ore processed at the nearby Dunwell mine.
The principal Dunwell workings are about 2km east of the highway and are accessible by four wheel drive vehicles with travel to the remaining portions of the property by foot. The majority of production occurred between 1926 and 1937, 45,657 tonnes were produced averaging 6.63 grams per tonne gold, 223.91 grams per tonne silver, 1.83 per cent lead, 4.01 per cent zinc and 0.056 per cent copper (gold equivalent of over 13 g/t or approximately$500/t rock). Potential exists to develop more reserves, along strike to the present workings and at depth below the No. 4 level. Drilling in 2010 has indicated a zone at least 300 metres long and 200 metres along dip with a true thickness of 6-7 metres. Similar to the ore mined, the gold grade of this new extension is probably 5-6 grams/tonne with appreciable silver, zinc, copper and lead.
The deposit consists of a series of quartz and quartz breccia veins hosted in thin bedded argillite, siltstone and greywacke of the Middle Jurassic Salmon River Formation (Hazelton Group). Andesitic tuffs of the underlying Lower Jurassic Unuk River Formation (Hazelton Group) outcrop to the east of the veins.
The deposit consists primarily of two veins, the Sunbeam (Number 8) vein to the north and the Dunwell (Number 23) vein to the south, along with a number of other veins. The veins are developed en echelon adjacent to a major north striking, west dipping fault zone. The veins are commonly situated along one or both sides of parallel lamprophyre dikes which are up to 0.6 metres wide.
The Sunbeam vein strikes 360 to 010 degrees and dips 40 to 60 degrees west. It varies from 1 to 1.8 metres in width, with a definite strike length of 315 metres and possibly up to 588 metres. The Dunwell vein strikes 360 degrees and dips 42 to 50 degrees west. The vein extends along strike for 240 metres and downdip for at least 240 metres, varying in width from 0.3 to 2.1 metres.
Mineralization consists of lenses, disseminations and stringers of pyrite, galena, sphalerite and tetrahedrite with minor chalcopyrite, native silver and argentite in a gangue of quartz and minor calcite. Locally, the Dunwell vein contains up to 75 per cent sulphides. The mineralization is more intense where the veins are intersected by fractures of the West fault zone. High-grade mineralization is contained within one ore shoot in the Dunwell vein. This ore shoot strikes for 30 metres, extends downdip for 150 metres and averages at least 1.2 metres in width. A chip sample across 1.14 metres assayed 6.9 grams per tonne gold, 4456 grams per tonne silver, 6.6 per cent lead and 5 per cent zinc (gold equivalent of 2.2 oz/t) (Minister of Mines Annual Report 1933, page 58).
The Dunwell claims are contiguous (to the north) with the past producing Portland Canal Mine. The Portland mine operated briefly between 1911 and 1912 producing 8,164 tonnes of ore averaging 2.33 g/t gold, 98.55 g/t silver and 1.56% lead. Drilling in 1973 defined a resource of similar tonnage of gold, silver, lead and zinc. BC government Minfile documents (Minfile 103P 064) reports that both mines lie within the Portland Canal Fissure Zone (a 6.5km long shear zone) which has hosted several historic mines that hosted high-grade lead/silver deposits. The Dunwell group of properties (Bear River, Dunwell, Silvershot) cover the northern half of the Portland Canal Fissure zone which is at a lower elevation and had greater historic production than the southern half.
This group of properties may have some of the best logistics in B.C.’s Golden Triangle. The group is located approximately 8km north of Stewart B.C. with power and Highway #37a running through the western edge of them. They range from close to sea level to 700m above sea level making them very accessible even in the winter time for exploration and potential mine reactivation.
The thick yellow outline is the outter edge of the Bear River (north), Dunwell (middle), and Silvershot (south) properties. Red lines are faults (center one is part of fissure zone). Thin yellow line (in middle) is Highway 37A and thin yellow line (on left) is the Alaska border. This view is looking north north west.
In this view looking east you see Dunwell's proximity to IDM's Red Mountin 11km to the east, Skeena's Porter Idaho (historical mine) 10km to the south and Ascot's Premier Mine 7km to the west. All three surrounding projects are at various stages of moving towards production.
The yellow highlighted area encompases the Portland Canal Fissure Zone. The area oulined in purple is the claim boudary of the contigous Bear River, Dunwell and Silvershot properties. There are three mine markers shown on the Dunwell Mine Group in this image. The Benali and George are two of about eight areas where historical production took place on the group of claims. The ore from these claims was milled at the Dunwell mine.