This Missing Link showing occurs in an area comprised of several lithologies. Most significantly is a prominent limestone marker bed in the Lower Jurassic Laberge Group sedimentary rocks which are well exposed. Late Cretaceous equigranular granite is also exposed and is observed to intrude the Laberge Group sedimentary rocks near tree line on Middle Ridge.
Two small dikes occur in this zone, both different from any of the lithologies observed elsewhere on Middle Ridge. The first is a chlorite-altered mafic dike with a finely crystalline groundmass and large white weathering, plagioclase phenocrysts up to 10 millimetres in length throughout. The dike cuts the Laberge Group. The second dike is a medium-crystalline, equigranular tonalite dike with little to no alteration.
Fifty-one samples were collected in this zone, mostly of non-vein material mineralized with a suite of sulphide minerals consisting of arsenopyrite, pyrite, pyrrhotite, chalcopyrite, galena, sphalerite and molybdenite. The mineralization periodically occurs on either side of the above mentioned limestone bed, typically in a zone of fine-grained, argillaceous sediments. There is little mineralization in the limestone itself, which may be an artefact of tight porosity due to recrystallization. The mineralized envelope can be as wide as 20 metres on either side of the limestone bed or as narrow as a few centimetres. The grab samples from along the contact with the limestone averaged 1 to 3 grams per tonne silver with one sample (C202118) containing 140 grams per tonne silver, 0.11 gram per tonne gold, 0.96 per cent copper, 3.6 per cent lead, 0.31 zinc, 0.19 per cent arsenic and 1.42 per cent antimony (Assessment Report 31079).
A sample of semi-massive arsenopyrite from the aplite dike (mapped as tonalite) assayed 1.05 grams per tonne gold and 3 grams per tonne silver (Assessment Report 31079). The dike is potentially a conduit for mineralizing fluids from the granite into the country rocks.
See Tannis (104M 074) for related geological and work history details of the Tannis (Golden Eagle) property of which the new Missing Link showing is part of.
