The Frog copper occurrence is located approximately 7 kilometres northeast of the confluence of Toad River and Yedhe Creek in the mountainous Muskwa Ranges of the Northern Rocky Mountains, 6 kilometres south of the Alaska Highway (Vail, J.R. [1957] - Thesis).

The occurrence is at the northern end of the Muskwa Anticlinorium, a major structure characterized by large, folded thrust sheets that expose rocks as old as Middle Proterozoic (Helikian), as well as Paleozoic rocks (Geological Survey of Canada Map 1343A; Geological Society of America, Geology of North America, Volume G-2, page 639). All belong to Ancestral North America (Geological Survey of Canada Map 1713A). The Middle Proterozoic rocks are pre-Windermere Supergroup and are known as the Muskwa Assemblage (Geological Society of America, Geology of North America, Volume G-2, page 111). This assemblage of carbonate and clastic rocks has been divided into seven formations. The Frog showing is in the Tuchodi Formation, a 1500-metre-thick succession of feldspathic, cross-bedded quartzite, with varying amounts of silty and argillaceous dolostone, siltstone and shale (Geological Survey of Canada Memoir 373, Paper 67-68).

Although no details are available, the Frog is typical of several minor copper showings in this anticlinorium, all of which occur in quartz-carbonate veins (Vail, J.R. [1957] - Thesis). The veins fill fractures, generally spaced a few metres or tens of metres apart. Individual veins are approximately 50 centimetres wide, and most cannot be traced very far. In many cases, the quartz-carbonate veins lie along the contacts of basic dikes (gabbroic dikes on Geological Survey of Canada Map 1343A) or near them, and here the zone of fracturing may be approximately 6 metres wide. Such fracture zones associated with dikes can locally be traced intermittently for approximately 350 metres.

Copper mineralization in the veins is sporadic and comprises chalcopyrite and, where weathered and oxidized, malachite. Only very minor, secondary chalcocite and limonite are present.

The mineralization is clearly structurally controlled given its association with the fracture-filling veins, which consistently strike north-northeast to north-northwest and dip subvertically. Many of the copper-bearing veins in the region occur within a few kilometres west of the front of large northeast-verging thrusts, near the base of the hangingwall, and they may be related to subsidiary fracturing. This would imply that the mineralization is Upper Mesozoic to Neogene or Paleogene, the age of the thrusting (Vail, J.R. [1957] - Thesis). Alternatively, and more likely, the veining and mineralization was contemporaneous with the basic dike intrusion, which is demonstrably Precambrian (Geology, Exploration and Mining in British Columbia 1971).

Work History

In 2005, Twenty-Seven Capital Corp. completed a regionally extensive program of geochemical (rock, silt and soil) sampling and a 9002.0 line-kilometre airborne magnetic survey on the area as the Muskwa property. A float sample (B374230), taken approximately 7 kilometres east-southeast of the occurrence, yielded 3.53 per cent copper (Assessment Report 28281).