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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  05-Dec-2012 by Karl A. Flower (KAF)

Summary Help Help

NMI 092F2 Cu1
Name THISTLE (L.91) Mining Division Alberni
BCGS Map 092F017
Status Past Producer NTS Map 092F02E
Latitude 049º 06' 23'' UTM 10 (NAD 83)
Longitude 124º 38' 13'' Northing 5440573
Easting 380527
Commodities Gold, Silver, Copper Deposit Types I06 : Cu+/-Ag quartz veins
K01 : Cu skarn
G06 : Noranda/Kuroko massive sulphide Cu-Pb-Zn
Tectonic Belt Insular Terrane Wrangell
Capsule Geology

The Thistle mine is located about 16 kilometres southeast of Port Alberni, just south of Father and Son Lake.

Basaltic flows and pillow basalt of the Triassic Karmutsen Formation (Vancouver Group) are underlain by a complexly inter- layered succession of volcanics and sediments of the Paleozoic Sicker and Mississippian to Lower Permian Buttle Lake groups. These include basaltic flows, agglomerates and bedded tuffs of the Upper Devonian McLaughlin Ridge Formation (Myra Formation), Sicker Group and limestones and marbles of the Upper Pennsylvanian to Lower Permian Mount Mark Formation (Buttle Lake Group, previously Buttle Lake Formation).

Disseminated to massive sulphide mineralization, consisting of pyrite, chalcopyrite and minor pyrrhotite plus sulphide rich quartz-carbonate veins, occur in sheared pyritic quartz-sericite schists with chloritized mafic volcanic flows ("Mine Flow Unit") and tuffs of the Upper Devonian McLaughlin Ridge Formation. A nearby limestone, which strikes 170 degrees and dips 65 degrees southwest, has largely been replaced by diopside (skarn). Disseminated magnetite, some of which has been oxidized to hematite, occurs in the calcite and malachite occurs in places.

Two ore zones, 40 metres apart, measure 2 to 20 metres long by 1 to 8 metres wide. A 1.8-metre chip channel sample of a high grade shear at the south end of the lower glory hole assayed 38.4 grams per tonne gold, 30.5 grams per tonne silver and 2.69 per cent copper (Assessment Report 11064). Drilling in 1984, intersected 20 centimetres of 17.6 grams per tonne gold in chloritic basalt, including 2 centimetres of massive pyrite (Assessment Report 15288).

The Thistle Mine was reported by early workers to be a skarn deposit in altered limestone, intruded by fine-grained diorite.

From 1938 to 1942, the Thistle Mine produced 6,283 tonnes of ore grading 4.9 per cent copper, 10.3 grams per tonne silver and 13.7 grams per tonne gold (Assessment Report 17661). Nexus acquired the property in late 1980. In 1981 and 1982, Nexus conducted surveys in the Panther Road (MINFILE 092F 439) and Thistle mine areas. In 1983, the property was optioned by Westmin Resources Ltd. and an exploration program of geological mapping, soil sampling, geophysical surveys and 6053.9 metres of diamond drilling was completed. In 1988, Nexus completed 1205.4 metres of diamond drilling on anomalies previously not tested, primarily on the Saddle occurrence (MINFILE 092F 442). In 1995, the area was staked as the Thistle 1 claim and a program of geochemical sampling was completed.

EMPR AR 1899-608,778-779; 1901-1097,1101; 1902-307; 1927-340-341; 1928-366; 1930-291; 1938-A38; 1939-40; 1940-27,73-74; 1941-27,71; 1942-66; *1944-147,154-157; 1965-238
EMPR BULL 37; 101, p. 158, Appendix 6
EMPR EXPL 1980-166; 1982-143; 1983-196; 1985-141; 1986-A70
EMPR FIELDWORK 1988 pp. 61-74
EMPR OF 1987-2; 1988-24; *1989-6
EMPR P 1991-4, pp. 102,105
EMPR PF (Stevenson, J.S., (1941): Plan of Workings; 092F General File - Laanela, H., (1965): Report, Gunnex Limited, Occurrence #10)
EMR MP CORPFILE (United Prospectors Ltd.; Vananda Explorations Ltd.)
GSC MAP 17-1968; 49-1963
GSC OF 463; 1272
GSC P 68-50, p. 38; 79-30
CIM BULL Vol. 83 No. 935, March 1990 pp. 125-135
GCNL #213,#226, 1982; #103, 218, 1984; #50,#96,#178, 1985; Dec.8, 1986
N MINER Aug.18, 1983; May 30,Oct.28, 1985
Hudson, R. (1997): A Field Guide to Gold, Gemstone & Mineral Sites of British Columbia, Vol. 1: Vancouver Island, pp. 139-140