Walsh Lake
The Walsh Lake target is 10 km south of the FAT deposit, adjacent and south of the historical Tundra Gold Mine that was abandoned in 1999. The north part of this target area is connected by a road network that links to the FAT deposit. Walsh Lake is interpreted to be a series of structural zones, parts of which are on strike with the deposits exploited in the Tundra Gold Mine. Preliminary metallurgy and production data from the Tundra Mine has indicated that ore at Walsh Lake is non-refractory free milling.
The Walsh Lake target area stretches one and a half kilometer south from the former mine. This area has undergone several generations of exploration, including some limited past drilling campaigns showing these gold occurrences were located near a regional stratigraphic contact, which could provide significant strike potential. Gold-bearing quartz veins are hosted in sheared rocks near the contact between metamorphosed graywacke and mafic volcanic rocks. The metagraywacke units are fine to coarse sand size material with well preserved, laterally discontinuous, fining upward sequence of graded beds. This turbidite section is distinguished by the absence of volcanic and chemical sedimentary rocks intercalated in the Bouma beds. Metamorphosed mafic volcanic rocks are black to green-black, dense, fine-grained, and typically show fragmental textures. These rocks are principally made up of fine hornblende and plagioclase laths, with localized irregular and fractured dark garnet crystals. Drilling on the Walsh Lake contact zone consistently encounters silica alteration with gold-bearing intervals up to 20 m above the contact in siltstone and up to 60 m below the contact in mafic volcanic rocks interbedded with siltstone or felsic volcanic rocks. Gold is concentrated in arsenopyrite-bearing silica-altered sheared rocks containing abundant quartz veins, with true widths from one to 12 m. The shearing is almost parallel with bedding. This deformation event is associated with the tilting and regional metamorphism and focused along rheological changes in the stratigraphy.