The Sheep Mountain showing is hosted in diabase (diorite) that has been intruded into undivided sedimentary rock of the mesoproterozoic Purcell Supergroup, Roosville Formation. Two samples (18 and 19) were collected in 2007 from brecciated zones in altered diabase (diorite) that hosted quartz-carbonate veins. Limonite, pyrite and chalcopyrite were reported to occur in the breccia zone. Sample 18 graded more than 1 per cent copper; sample 19 graded 0.13 per cent copper and 0.09 gram per tonne gold (Assessment Report 29552).
Sheep Mountain itself represents a unique geological setting with large complex structural zones, huge alteration, and abundant sulphide mineralization. It is host to a number of mineralized quartz/calcite/carbonate veins that contain chalcopyrite, malachite, azurite, galena, sphalerite, hematite, limonite, pyrite and scorodite. Some of these veins have been explored by adits and trenching. The veins typically are quartz with anchorite and calcite along the margins. The largest vein in the mountain area was over 2 meters wide. The majority of the veins occur along NE trending structures and are hosted by a thick unit of diabase, thought to be sills. Strata in the Sheep Mountain area changes attitude across Elk River from gentle east dips on the east side to near vertical dips along the west side, indicating a major fault system. A major alteration zone, white clay (argillic/sericitic alteration), occurs along some of the structural breaks. The altered zone is at least one kilometer long and 500 metres wide, following a portion of the Elk River canyon.
In 2007, a prospecting and rock geochemistry program was conducted on mineral tenures 372755, 555975, 555976, 555977, 556361, and 557771, near the confluence of the Wigwam and Elk rivers on behalf of owners Robert Morris and Craig Kennedy (Assessment Report 29552). MINFILE occurrences Ramshorn (082GSW010), Jennie (082GSW011), Sweet May (082GSW012), Silver King showing (082GSW028), and Leah (082GSW029) were covered by these tenures, also known as the Wigwam (082GSW096) and Maxiwam (082GSW097) claims. Eight man-days were spent prospecting and collecting rock samples at Sheep Mountain. Over the course of the program 59 rock samples were collected in total.
Refer to Silver King (082GSW028) for further work history information.
