The TK 37 (C-D zones) occurrence is located in a north-northwest–facing valley approximately 5 kilometres west of Frog River and 16 kilometres north of the confluence of the Frog River with Geese Creek.
Regionally, the area lies on the western edge of the Omineca Belt near the Kutcho fault, marking the boundary with rocks of the Intermontane Belt. The area is underlain by Early Jurassic granodioritic intrusive rocks of the Pitman Batholith with minor roof pendants of metavolcanic and metasedimentary rocks. Early regional mapping correlated these rocks with the Devonian to Permian Asitka Group based on lithological similarities (Geological Survey of Canada Open File 483). Fossil evidence from later regional mapping dates least part of the sequence as Mississippian (Geological Survey of Canada Paper 80-1B, pages 207-211). A tentative age of Devonian to Permian is given to these metamorphic rocks.
Five stratigraphic units have been recognized and are, from oldest to youngest, feldspathic chlorite schist; phyllite, sericite and calcareous sericite schist; massive rhyolite, chert and sericite schist; carbonate and an upper feldspathic chlorite schist. The rocks are complexly folded and have undergone at least two phases of deformation. They are predominantly calc-alkaline with minor alkaline members. The sequence is similar in many respects to rocks of the Kutcho Formation in the southeastern corner of the Cry Lake map area (NTS 104I).
Locally, copper-molybdenum occurrences have been identified in a granite to granodiorite pluton. The plutonic rocks are massive, poorly fractured, blocky and frequently host pegmatitic dikes, ranging up to 60 centimetres wide and composed of feldspar, quartz, biotite, muscovite and magnetite. Some pegmatites contain crystals up to 5 centimetres long. Fractures in the granite and granodiorite have been infilled with finer grained compositional equivalents. Nearby metamorphic rocks are composed of quartzite, and chlorite, sericite and biotite schists. Inclination of the metamorphic-intrusive contact decreases from vertical in the west to 30 degrees south in the east. Schistosity is parallel to the attitude of the contact. Evidence suggests that the metamorphic rocks were intruded by the granite to granodiorite pluton.
At the C-D zone, disseminated chalcopyrite and bornite are hosted in granite and pegmatite and felsite dikes and along narrow fractures, with the felsite dikes containing the most consistent mineralization. The pegmatite dikes strike generally 180 degrees with a dip of 45 degrees east and are up to 0.75-metre wide, whereas the felsite dikes vary from 0.05 to 0.30 metre wide, strike from 50 to 140 degrees and dip variably. Five other zones (E, F, G, I and H) of minor copper sulphide mineralization are reported to be extensions of the C and D zones.
In 1967, a select sample from the C-D zone yielded 0.80 per cent copper (Assessment Report 1674).
Work History
In 1967 and 1968, Quebec Cartier Mining Co. completed programs of geological mapping and silt sampling on the area as the TK 1-88 claim block.
In 2007, Charles Greig staked the area as the Pit Bullfrog property. In 2008, Bitterroot Resources Ltd. optioned the property and executed a program of stream sediment and moss mat sampling on the area.
In 2011, International Samuel Exploration Corp. optioned the Frog property and completed a program of prospecting, rock sampling and a 1029.0 line-kilometre airborne magnetic geophysical survey. The following year, a program of prospecting, talus slope sampling, detailed petrological analysis of outcrop and subcrop mineralization and fluid inclusion studies was completed.
In 2014, CJL Enterprises completed a program of geochemical and geophysical data review and rock sampling. The following year, a program of mineralographic and petrographic sampling was completed. In 2017, a total of 158.0 line-kilometres of airborne magnetic surveying was completed on the area as the Frog South and North properties. The following year, a program of 3-D magnetic modelling was performed on the previous year’s geophysical data.
