The Crescent Lake occurrence is located on the steep north slope of Mount Kathleen, southeast of Trout Creek and approximately 2.1 kilometres south-southeast of Crescent Lake and 2.25 kilometres west-northwest of Chapman Lake.
The area is underlain by medium- to coarse-grained, orthoclase porphyritic granite of the Lower Jurassic Pennask Batholith.
Locally, various forms of molybdenum-lead mineralization outcrop over an area 800 (north-south) by 600 (east-west)metres in size in the vicinity of the contact between phyllic-altered granite to the north and relatively fresh granite to the south. The altered granite contains minor disseminated molybdenite and pyrite.
Granite-hosted veins and isolated outcrops of quartz-sericite are mineralized with abundant disseminated and stringer pyrite, and minor disseminations and fracture fillings of molybdenite and galena. The quartz-sericite consists of a strong intergrowth of quartz and sericite that may be altered granite or a separate intrusion.
The altered and fresh granite is cut by clear quartz veins, 0.2 to 1 centimetre wide, locally forming stockworks. The veins contain fine-grained pyrite, molybdenite and galena along their margins. A second series of quartz veins, possibly derived from a different mineralizing event, contain sphalerite, galena and chalcopyrite. White, purple and light-green fluorite veins tend to be associated with these quartz veins.
In 1980, a sample of mineralized quartz-sericite assayed 0.017 per cent molybdenum, 0.185 per cent lead, 0.002 per cent zinc and 4.8 grams per tonne silver (Assessment Report 9123, page 10).
Work History
The area was first prospected and soil sampled as the Myrtle 1-10, Pig 19-26 and Chub 13-16 claims by Brenmac Mines Ltd. and Brencoll Mines Ltd. in 1966 and 1967. Also at this time, Wingdam & Lightning Creek Mining Co. completed a program of geochemical (soil and water) sampling, ground electromagnetic and induced polarization surveys and an airborne magnetic survey on the area immediately north of the occurrence as the Babe, Bob and Earl claims.
In 1979 and 1980, Brenda Mines Ltd., operator of the nearby Brenda (MINFILE 092HNE047) mine, carried out geological mapping and soil sampling on the area as the Crescent, Father, Mother and Mt. K claims. In 1981, 10 diamond drill holes, totalling approximately 1000 metres, were completed and are reported to have intercepted subeconomic mineralization. No assays were reported. In 1987, the company conducted four reverse circulation drill holes, totalling 372 metres after completing geological and geophysical surveys in the same year on the area as the Travis 1-2 and Moss 1-6 claims.
In 1995, Ragnar Bruaset completed a biogeochemical sampling program on the area as the Travis 1 claim. In 1998 and 1999, further programs of biogeochemical and soil sampling were completed on the claim. In 2006 and 2009, programs of geochemical (rock, silt and heavy mineral) sampling and biogeochemical sampling were completed on the Travis claims.
