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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  13-Dec-1995 by Craig H.B. Leitch (CHBL)

Summary Help Help

NMI
Name MARK, LUKE, JOHN, PERRY CREEK Mining Division Fort Steele
BCGS Map 082F050
Status Prospect NTS Map 082F08E, 082F09E
Latitude 049º 29' 12'' UTM 11 (NAD 83)
Longitude 116º 06' 04'' Northing 5481947
Easting 565104
Commodities Gold, Lead, Silver, Copper, Zinc Deposit Types I01 : Au-quartz veins
I05 : Polymetallic veins Ag-Pb-Zn+/-Au
Tectonic Belt Omineca Terrane Ancestral North America
Capsule Geology

The Perry Creek gold showings (Mark, Luke, John claims) are located about 23 kilometres west-southwest of Cranbrook. The area has been prospected for placer and lode gold since the mid 1800s. Several small shipments of gold ore are reported from adits, shafts and trenches although no major deposit was discovered. In the early 1980s, Gallant Gold carried out prospecting, geologic mapping and rock chip sampling; soil, silt and heavy mineral sampling; VLF-EM and magnetometer surveys and bulldozer trenching.

The Perry Creek area is underlain by sedimentary rocks of the Creston Formation of the Middle Proterozoic Purcell Supergroup. The Middle Creston Formation consists of a sequence of medium bedded, grey to maroon, fine-grained quartzite with intercalated thin beds of grey phyllite; a stockwork of quartz veinlets, up to 7 centimetres thick, is found within the quartzite. A few of these quartz stringers carry up to 2 per cent hematite and minor chalcopyrite. To the west, this sequence is overlain by the Upper Creston succession of thinly interbedded, light and dark green argillites and green siltstone, locally phyllitic. To the northwest, the sequence is overlain by the Kitchener Formation.

Microdiorite bodies, part of the Middle Proterozoic Moyie intrusions, are generally medium grained but have porphyritic phases containing hornblende phenocrysts. The microdiorite bodies are generally pervasively chloritized and locally contain quartz stockwork; argillites on both footwall and hangingwall are siliceous, possibly due to the intrusive event. Disseminated pyrite occurs in both the quartz stockwork in the microdiorite and the adjacent phyllites.

Gold mineralization is associated with quartz veins, stockworks and siliceous zones in the vicinity of the microdiorite bodies that are emplaced along regional shear zones in the sedimentary rocks. These shear zones run parallel to Perry Creek (i.e. northeast) on the west side of the creek. The shear zones are filled by vein, irregular lenses and stringers of quartz containing boxworks of limonite (after pyrite) and occasionally gold, galena, sphalerite and chalcopyrite; silver is known from assays, which range up to 53 grams per tonne silver and 3.4 grams per tonne gold over 3 metres in trenches (Assessment Report 13007). Hydrothermal alteration of wallrocks occurs as chlorite, sericite and talc schists. The shear zones are topographically recessive, occurring between resistant ledges of siliceous sediments, possibly due to the ease with which breccia, gouge and hydrothermally altered materials in and marginal to the shears are eroded. Thus, much of the mineralization associated with these shears may be yet to be discovered.

Additional work (very low frequency electromagnetic survey) has been carried out on the Walsh claims which adjoin to the south, but no mineralization was discovered (Assessment Report 12983). Kokanee Exploration worked on the Price property adjacent or nearby to the north (possibly actually on the next sheet, 082FNE; description only locates it as 20 kilometres west of Cranbrook in the Perry Creek area, underlain by gently rolling terrain ranging in elevation between 1370 and 1525 metres and accessible by good year-round logging roads; only reference is George Cross News Letter No.183, 1990). The Kokanee property covers a large quartz vein which contains visible free gold with minor values in lead and silver, hosted by strongly sheared Middle Proterozoic sediments, and is adjacent to the large regional Perry Creek fault. Previous work partly exposed the vein for a distance of 35 metres, dipping steeply west and striking northeast with a true width at surface of 6 metres and containing up to 206 grams per tonne gold.

Bibliography
EM GEOS MAP 1998-3
EMPR ASS RPT 7103, 7723, 8598, 9850, 11802, 12983, *13007, 15649, 19116
EMPR MEIP 78/79 Report on the Perry Creek gold prospect, by J.H. Montgomery
EMPR PF (Geologic and geochemical reports on the Janet, Janet 1, Birdie Load, Gold, Quartz Creek, Lone Eagle, Eclips, Anna, Standard, Agnes, Pioneer, Oyster, Evening Star, Luke, Mark, John by D.F. Symond, Dec. 1, 1978; July 5, 1978)
GSC MAP 15-1957
GSC OF 820; 929; 2721
GCNL #183, 1990

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