The region of the Marg West occurrence is underlain by Early Jurassic granodiorite which intrudes Upper Triassic volcanics and sediments of the Stuhini Group. A roof pendant of volcanic breccia about 600 metres long and 300 metres wide extends northeast from Dokdaon Creek. The breccia clasts vary from felsitic to rhyolitic in nature. Eocene, north trending felsite and rhyolitic dikes cut the granodiorite and volcanic breccia. These dikes were also dated in the vicinity of the occurrence at 49.7 +/- 1.7 Ma (Fieldwork 1988). Later east trending dikes of fine-grained diorite and diabase cut all other rocks.
Mineralization occurs within a zone of pyritization and chloritic alteration in both the granodiorite and volcanic breccia near their contact. This zone has an average width of 100 metres and a traced length of 250 metres. Further strike extensions are obscured by overburden at both ends. Secondary biotite and epidote are also observed.
The zone is host to a vein-fracture system with as many as 14 parallel quartz veinlets per metre, ranging from 0.3 to 8 centimetres in width. They contain pyrite, chalcopyrite, molybdenite, scheelite and minor galena. The veinlets are steep dipping with a northeast strike.
Assays from chip samples were consistently low with no values above 0.86 gram per tonne gold, 10.63 grams per tonne silver, 0.2 per cent copper, 0.17 per cent tungsten and 0.05 per cent molybdenum. Chip samples had an average length of about 2.5 metres.
Work History
Teck Exploration Ltd. carried out geological mapping, sampling and trenching on the Dok and Marg claims in 1980 and 1981 (Assessment Report 9617). Geological mapping, chip sampling and drilling and blasting were undertaken on the Dok and Marg claims, at which times the Marg East and Marg West were first documented.
In 1990, Homestake Mineral Development Company prospected the Canyon 24 claims which covered some of the Marg area worked previously by Teck. A total of twenty - three rock samples were collected from zones of alteration and mineralization. Several samples were taken in the Marg West (104G 058) and Marg East (104G 089) showing areas.
In 1971, Swiss Aluminum Mining Co. undertook a program of geological mapping and silt sampling on the Gu claims to the north of the Marg area (Assessment Report 3847).
In the late 2000s, five main areas of interest within the BRC Property of Brades Resources Ltd covered a large area between Dokdaon Creek and Yeheniko Creek. These are referred to as the Dok 35 area, the Teck Area, the Yeti Area, the Strata Creek Area, and the Yehiniko East Area. BRC carried out a preliminary exploration program in the fall of 2007 consisting of airborne geophysical surveys and a limited program of verification sampling. Airborne surveys were carried out by Fugro Airborne Surveys primarily in the Strata Creek area and verification sampling was carried out in the southwestern part of the claim group in the area referred to as the Teck area that contains the Marg West (104G 058) and Marg East (104G 089) showings. In 2010, Brades Resources completed detailed digital topographic maps of the Teck and Yeti areas and compiled all historic rock, soil and stream sampling data for the entire BRC Property. Later in 2010, Brades conducted detailed topographic mapping to cover additional parts of the BRC property and several helicopter assisted site visits were completed to verify mineralization reported in the central part of the BRC property. A total of 24 rock samples were collected. In late 2010 to January 2011 a detailed structural analysis of the Teck area and the Yeti area was carried out using shaded hillside imagery technology.
