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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  11-Sep-1995 by Gilles J. Arseneau (GJA)

Summary Help Help

Name M.T. FRACTION (L.10110) Mining Division Golden
BCGS Map 082K048
Status Past Producer NTS Map 082K08W
Latitude 050º 25' 19'' UTM 11 (NAD 83)
Longitude 116º 24' 12'' Northing 5585716
Easting 542386
Commodities Silver, Copper, Lead, Zinc Deposit Types I05 : Polymetallic veins Ag-Pb-Zn+/-Au
Tectonic Belt Omineca Terrane Ancestral North America
Capsule Geology

The M.T. Fraction consists of one Reverted Crown grant (Lot 10110) which is located on the southeast flank of Mount Catherine, on the north side of Delphine Creek in the Golden Mining Division, at an elevation of 1677 metres.

Regionally, the area is underlain by Proterozoic clastic sedimentary rocks of the Purcell and Windermere supergroups and by lower Paleozoic strata of the Beaverfoot and Mount Forster formations (Geoscience Map 1995-1).

The Purcell Supergroup strata include the Aldridge, Creston, Kitchener, Dutch Creek and Mount Nelson formations. The Windermere Supergroup unconformably overlies the Purcell Supergroup rocks and includes the Toby Formation and Horsethief Creek Group (Paper 1990-1).

In the vicinity of the occurrence, rocks of the Kitchener and Dutch Creek formations have been further subdivided and assigned to the Van Creek and Gateway formations. The Van Creek Formation correlates with the Lower Kitchener Formation while the Gateway Formation is equivalent to the lower portion of the Dutch Creek Formation. The Mount Nelson Formation has been subdivided into seven discrete members, a lower quartzite, a lower dolomite, a middle dolomite, a purple dolomite, an upper middle dolomite, an upper quartzite, and an upper dolomite (Open File 1990-26).

Rocks of the Horsethief Creek Group, Beaverfoot and Mount Forster formations are folded and overthrusted by rocks of the upper portion of the Dutch Creek Formation and the lower members of the Mount Nelson Formation. The sedimentary rocks have undergone regional metamorphism to at least greenschist facies.

The M.T. Fraction is hosted within dolomite of the Mount Nelson Formation. The occurrence consists of a quartz-carbonate vein 20 to 30 centimetres wide which has been explored with a small adit. Limited production at the turn of the century yielded 254,641 grams of silver, 1655 kilograms of copper and 39 kilograms of lead. Ore minerals include galena, tetrahedrite and chalcopyrite with minor sphalerite. The vein is within a dilatant zone along a normal fault that strikes southeast and dips 80 degrees west.

EMPR AR 1901-1013; 1902-135; 1909-101; 1911-289; *1919-114
EMPR ASS RPT 2502, 8429, 9738, 12112, *18049
EMPR EXPL 1980-116
EMPR FIELDWORK 1989, pp. 29-37
EMPR OF 1990-26
EMPR PF (82KSE General File - Geology map by P. Billingsley, 1958)
GSC MEM 148; 369
Pope, A.J. (1989): The Tectonics and Mineralization of the Toby- Horsethief Creek Area, Purcell Mountains, Southeast British Columbia, Canada, unpublished Ph.D. Thesis, University of London, England
EMPR PFD 843080