The Gu occurrence is located near the headwaters of Dokdaon Creek approximately 11 kilometres east of the Stikine River.
The Gu showings are associated with shear zones which crosscut a granodioritic pluton of the late Early Jurassic Cone Mountain Plutonic Suite. The granodiorite is typically medium-grained, with hornblende content greater than biotite. Volcanic rocks correlated with the Upper Triassic Stuhini Group occur throughout the area. They are comprised of dark grey to green, massive to feldspar porphyritic andesite flows with lesser fine-grained tuffs, siltstones and mudstones. There are also minor limestone beds. The host pluton is in contact with Stuhini rocks on its northern and eastern boundaries. Crosscutting both the volcanic rocks and the granodiorite are north trending felsic dikes which have been dated at 49.7 +/- 1.7 Ma (Paper 1989-1). A Lower Permian unit consisting of limestone, marble and calcareous sedimentary rocks of the Stikine Assemblage are in contact with the granodioritic host pluton on its southern boundary, several kilometres south of the Gu Showing. A unit of Pennsylvanian volcanic rock of the Stikine Assemblage is in contact along the west side of the pluton about 3 kilometres east of the Gu occurrence.
Copper mineralization was observed in and near an extensive shear zones within the Cone Mountain intrusions, striking between 60 to 80 degrees. Fractures parallel to the fault or conjugate to it, contain chalcopyrite and are traced for approximately 1.6 kilometres. Mineralization does not occur more than 500 metres from the main fault and is sporadic, restricted and low grade. Some unmineralized ankerite veining and later diorite dikes occur in the shear zone. Chlorite alteration is observed nearby with barren quartz stringers. Quartz vein sample 90-G1-Q61, taken in 1990 by Schellex Gold, is located along the correct "GU" Creek tributary where Swiss Aluminium first discovered the GU mineralization in 1972. The sample graded 1.36 per cent copper and 2.4 grams per tonne silver; gold was weakly anomalous (Assessment Report 21145).
Fine quartz veining is commonly found in the marginal contact zone of the granodiorite along regionally predominant joints, striking at 160 degrees. These fine quartz stringers are often only hairline fissure-fillings but may be up to over 2 centimetres in width. They consist of milky quartz containing mostly pyrite with specks of chalcopyrite, galena, sphalerite, molybdenite and occasional scheelite.
Work History.
In 1970 Canadex Mining Corp. conducted soil sampling and geological mapping in the Dokdaon Creek area which resulted in the discovery of several quartz pyrite and quartz chalcopyrite veins associated with numerous northerly trending shear zones.
In 1971 the Swiss Aluminum Mining Co. optioned several claims immediately to the north of the Dokdaon property including the GU. They established cut grids and conducted soil sampling, a ground magnetics geophysical survey and hand trenched anomalous areas. They mapped the GU claims but did not discuss sampling.
Teck Corporation conducted a hand trenching and sampling program on the Dokdaon property in the area in 1981.
In 1989, the RB 15 and RB 17 claims were staked. During July of 1990, Razor 1 and Razor 2 were staked and the four claims were grouped under the name Dokdaon. In 1990 fieldwork was carried out on the Dokdaon property. A total of 49 rock, 24 soil and 8 silt samples were collected. The 1990 work by Schellex Gold Corp consisted of prospecting, surface sampling and geological mapping. Several rock samples assayed returned elevated values in copper, lead, zinc, gold and silver. A number of samples were taken just east of vicinity of the Gu North showing (104G 084) and some within a few hundred metres east of the Gu showing (104G 075) consisting of quartz-carbonate veinlets with sulphides gave significant assays (Figure 4, Assessment Report 21145).
Five main areas of interest within the BRC Property of Brades Resources Ltd covering a large area between Dokdaon Creek and Yeheniko Creek. For reference 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.
