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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  10-May-2018 by Karl A. Flower (KAF)

Summary Help Help

BCGS Map 082L050
Status Prospect NTS Map 082K05W, 082L08E
Latitude 050º 28' 35'' UTM 11 (NAD 83)
Longitude 118º 00' 05'' Northing 5592079
Easting 428946
Commodities Silver, Zinc, Lead Deposit Types E14 : Sedimentary exhalative Zn-Pb-Ag
Tectonic Belt Omineca Terrane Monashee, Kootenay
Capsule Geology

The Casey 7 showing is located near the confluence of Trout Creek and Pingston Creek, approximately 55 kilometres south of Revelstoke.

The area is underlain by rocks of the Thor-Odin gneiss dome of the Proterozoic Monashee Complex and by metamorphic rocks of the Proterozoic to Paleozoic Kootenay Assemblage. The Thor-Odin dome is one of a series of gneiss domes spaced approximately 80 kilometres apart. A central core zone in the dome consists of gneissic and migmatitic rocks. This zone is surrounded by a heterogeneous assemblage of metasedimentary rocks of the Mantling zone and Fringe zone, the latter containing abundant pegmatite and lineated quartz monzonite. The Supracrustal zone, consisting of quartzite, marble, phyllite, schist and metavolcanic rocks, forms a cover to the gneisses.

The mineralized horizon (the Ledge horizon) occurs in an east- west –trending succession of metasedimentary rocks of the Mantling zone. The rusty weathering succession consists of a heterogeneous mixture of schist and gneiss, calcareous quartzite, calc-silicate gneiss, marble and amphibolite. The Ledge consists of fine-grained, dark graphitic-sericitic schist, dark quartz-rich schist, calc-silicate gneiss and minor siliceous marble layers. Pyrite and pyrrhotite are disseminated throughout these units resulting in a characteristic rusty weathering.

Within the Ledge conformable mineralization consisting of pyrrhotite, pyrite and sphalerite with minor galena has been traced by outcrop and diamond drill holes for approximately 13 kilometres from Mount Symons to the west shore of Arrow Lake.

Drilling indicates that there are at least four massive sulphide layers within the Ledge. It is not known if these are individual layers or fold repetitions of one or more layers. The massive sulphide layers consist of medium to coarse- grained pyrrhotite or pyrite with varying amounts of dark sphalerite. Quartz-eyes are common in the massive sulphide layers and sphalerite is commonly aligned parallel to layering in the adjacent schists. The footwall and hangingwall of the Ledge is comprised of alternating beds of quartz-mica schist and hornblende and feldspar-garnet gneisses interspersed with pure white quartzite and marble members. The marble members provide good stratigraphic markers.

Four types of strata-bound massive sulphide mineralization have been observed: 1) fine-grained homogeneous massive sulphides comprising mainly pyrrhotite with rare magnetite, pyrite, sphalerite and galena; 2) pyrrhotite, pyrite, sphalerite and galena as matrix in quartz-rich calcareous gneisses; 3) pyrrhotite, pyrite, sphalerite and galena in marble with graphite and hematite and 4) marcasite, pyrite, sphalerite, galena in pegmatite vugs between quartz crystals.

The structure is dominated by a series of east-west– trending, open to tight folds. These are inclined to the south, overturned to the north and plunge variably to the east and west. The southerly dipping Ledge horizon has been mapped at two places on the Casey property in the south west near the confluence of Trout Creek and Pingston Creek and to the north east (see Pingston occurrence, MINFILE 082KSW099), near the west shore of Upper Arrow Lake. The Ledge averages 40 metres in true thickness and mineralized sections can be greater than 30 metres true thickness.

Historical drilling on the area by Cominco is reported to have yielded 2 to 2.5 per cent zinc over 3 to 4.5 metres (Assessment Report 9651).

In 1979, rock sampling from the adit area yielded up to 4.11 per cent zinc, 0.04 per cent lead and 5.1 grams per tonne silver, while sampling to the south west yielded up to 2.74 per cent zinc, 0.25 per cent lead and 10.6 grams per tonne silver (Assessment Report 08415).

In 1989, a 1- metre chip sample (59803), taken to the south west on the Ledge 2 or Ping Pong 3 claim, assayed 0.389 per cent lead, 1.57 per cent zinc and 3.0 grams per tonne silver, while a 0.3- metre chip sample (59808) of sub-crop assayed 2.02 per cent lead, 1.27 per cent zinc and 75.9 grams per tonne silver (Assessment Report 19243).

In 1992, five trenches on the Ledge horizon, extending for approximately 550 metres to the south west, yielded: 3.3 grams per tonne silver, 0.2 per cent lead and 3.0 per cent zinc over 10.2 metres width and a true width of 5.4 metres from Trench 3A; 3.5 grams per tonne silver, 0.1 per cent lead and 2.1 per cent zinc over 8.0 metres width and a true width of 4.0 metres from Trench 3C; 11 grams per tonne silver, 0.5 per cent lead and 2.1 per cent zinc over 11.5 metres width and a true width of 8.2 metres, including 25 grams per tonne silver, 0.7 per cent lead and 3.2 per cent zinc over 3.5 metres and a true width of 2.5 metres, from Trench 3F; 13 grams per tonne silver, 1.7 per cent lead and 3.4 per cent zinc over 3.4 metres from Trench 4 and 2.7 grams per tonne silver, 0.1 per cent lead and 2.4 per cent zinc over a true width of 9.7 metres, including 7.6 grams per tonne silver, 0.2 per cent lead and 6.8 per cent zinc over 1 metre, from Trench 5C (Assessment Report 22664).

In 1993, drilling near the 5C trench yielded: 0.95 per cent zinc and 2.0 grams per tonne gold over 26.5 metres, including 13.4 per cent zinc and 3.6 grams per tonne silver over 0.3 metre from drill hole A-1; 1.93 per cent zinc and 2.0 grams per tonne silver over 15.7 metres including 10.4 per cent zinc, 0.31 per cent lead and 7.2 grams per tonne silver over 1.0 metre in drill hole A-2 and 1.58 per cent zinc and 2.0 grams per tonne silver over 18.2 metres, including 9.5 per cent zinc, 0.60 per cent lead and 7.1 grams per tonne silver over 1.0 metre from drill hole A-3 (Assessment Report 23120).

A former adit, of unknown age and length, is reported on the west side of Pingston Creek, just north of its junction with Trout Creek. The area was staked and explored by Cominco during 1947 through 1966 as part of the Big Ledge (MINFILE 082LSE012) property. In 1967, drilling was done by Northwest Zinc. In 1976, reconnaissance mapping was completed by Metallgesellschaft. In 1979, Esperanza Explorations Limited conducted geological mapping and geochemical surveys. In 1981, geological, geochemical and geophysical surveys were completed by Esperanza. In 1988 and 1989, Noranda Exploration Company completed programs of soil and rock sampling, line-cutting and geological mapping on the area as the Ping Pong claims. In 1990, a program of geological mapping, geochemical sampling and a ground magnetic survey were conducted on the area immediately south as the AMF claims. In 1992, Teck completed a program of soil and rock sampling, geological mapping, trenching and a magnetometer survey on the area as the Arrow claims. The following year, nine diamond -drill holes, totalling 943.6 metres, were completed to test the south west portion of the Ledge horizon. During 2006 through 2015, programs of prospecting, rock sampling, a ground magnetic survey and six diamond drill holes, totalling 938.0 metres, were completed on the area.

EMPR EXPL 1976-E56
EMPR FIELDWORK 1987, pp. 55-58; 1988, pp. 49-54; 1992, pp. 255-257
EMPR OF 1990-30; 2000-22
EMPR RGS 082L, 1976; 32, 1991
GSC MAP 7216G; 8492G
GSC OF 637; 658
GSC P 64-1; 65-1; 91-2, pp. 115-135
CJES Vol. 26, No. 2
Placer Dome File