The Red Bluff showing is located between Gumas and Washout creeks, 8.0 kilometres northeast of Alice Arm. The area has been investigated extensively for copper and molybdenum.
The region is underlain by an assemblage of volcanics and sediments comprising the Upper Triassic Stuhini Group and the Lower Jurassic Hazelton Group. This assemblage has been folded into a north-northwest trending anticline (Mount McGuire anticline) and regionally metamorphosed to greenschist facies.
The showing consists of a unit of pyritized feldspar to feldspar hornblende porphyritic andesitic to dacitic volcanic, informally called the Copper Belt. This unit, of the Hazelton Group, is 0.7 by 4.0 kilometres in size and trends northwest. It is bounded to the east and west by north to northwest striking, moderately to steeply dipping beds of argillite, siltstone, greywacke and conglomerate. The porphyritic volcanic has been subjected to sericitization, silicification and carbonate and argillic alteration. It occurs in a zone of intense fracturing and shearing accompanied by numerous north to northeast striking andesitic dikes.
The mineralogy is characterized by disseminations, veins and fracture coatings of pyrite that comprises up to 15 per cent of the volcanic. Minor chalcopyrite occurs locally along fractures and as disseminations. A chip sample taken across 1.8 metres at the entrance of a short adit in the iron oxide-stained bluffs above Gumas Creek, assayed trace gold, 27 grams per tonne silver and 0.40 per cent copper (Minister of Mines Annual Report 1967, page 42). Minor scheelite is reported to have been found just east of here. The mineralization of this occurrence is similar to that of other occurrences in the Copper Belt of the upper Kitsault Valley.
Two short adits were driven prior to 1920 in the prominent iron oxide-stained bluffs above Gumas Creek. During 1991, reconnaissance soil sampling was conducted on the Red Bluff group of claims on behalf of owner, M. Boyle. In 1992, a geological and geochemical survey was undertaken by Noranda Exploration on behalf of Hemlo Gold Mines Inc. In 1993, Noranda Exploration Company conducted geological mapping and soil geochemical surveys on the Dak and MB claims. In 2009, M. Boyle and H.M. Jones conducted some prospecting over a part of the large alteration zone.
