Ministry of Energy, Mines and Natural Gas and Responsible for Housing
News | The Premier Online | Ministries & Organizations | Job Opportunities | Main Index

MINFILE Home page  ARIS Home page  MINFILE Search page  Property File Search
Help Help
File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  11-Apr-2008 by Mandy N. Desautels (MND)

Summary Help Help

NMI 092I6 Cu5
Name ALWIN, ALWIN MINE, O.K. (L.3644), CHATAWAY, IOU (L.3643), APEX (L.3645), EZZ, DEKALB, NO. 4 - NORTH Mining Division Kamloops
BCGS Map 092I045
Status Past Producer NTS Map 092I06E
Latitude 050º 28' 42'' UTM 10 (NAD 83)
Longitude 121º 05' 59'' Northing 5593541
Easting 634827
Commodities Copper, Silver, Gold, Molybdenum, Lead Deposit Types I06 : Cu+/-Ag quartz veins
L04 : Porphyry Cu +/- Mo +/- Au
Tectonic Belt Intermontane Terrane Quesnel
Capsule Geology

The Alwin deposit is situated within the central core of the Early Jurassic-Late Triassic Guichon Creek batholith. It is hosted entirely by Bethsaida phase granodiorite which is locally fractured and altered by potassium feldspar and sericite to give red and green discolourations respectively. Steep dipping aplite dykes and lenses visible in the first 210 metres of the adit strike east and northeast. Elsewhere and locally they form a network of veins in brecciated granodiorite. Quartz-plagioclase porphyry dykes up to 6 metres wide strike north and dip steeply east. These dykes are sericite and calcite-altered, weakly mineralized and offset by east striking "ore faults".

Regional faults near the Alwin mine strike north and east. In the mine, faults range from narrow shears to "strong gougy faults" up to 60 centimetres wide. The largest fault is north and northeast striking, moderately dipping, 60 centimetres wide, and offsets ore zones as well as "ore faults". "Ore faults" contain a sericitic or clay gouge, strike east and dip steeply within high-grade bodies.

Fractures occur in two main sets; one strikes north-northeast and dips moderately east, the other strikes east and is nearly vertical. They may or may not be mineralized. East dipping fractures locally contain mineralized quartz veins up to 10 centimetres wide.

The deposit is defined as a lens approximately 457 by 244 by 152 metres, being open at depth. The ore zones have two dominant trends; 075 to 090 degrees, and 290 to 305 degrees. In plan and section, these zones pinch, swell and digitate. Chalcopyrite and bornite occur as disseminations, clots and discontinuous massive veins and veinlets with minor pyrite and trace chalcocite. Small amounts of gold and silver are reported (Exploration in British Columbia 1980). Gangue minerals are mainly flaky sericite and quartz with lesser amounts of chlorite, specularite, calcite and tetrahedrite- tennantite. Occasional massive epidote pods are found adjacent to ore. Post-ore iron carbonate veins are common in ore zones.

Lower grade mineralization is related to fracturing. Mineralized fractures contain minor chalcopyrite, bornite, molybdenite, pyrite, specularite, and in one place galena in vuggy quartz and calcite veins. Potassium feldspar, chlorite, sericite and possibly kaolinite occur as gangue minerals.

The presence of high grade copper mineralization was first noted on the Alwin property in the late 1800s. In 1980 and 1981, DeKalb Mining Corporation produced at a rate of 700 to 800 tons per day. The property was subsequently purchased by F.D. Miller and stripped of buildings and machinery. The land was reclaimed and mine openings sealed.

In 1993, J-Pacific Gold Inc. (then, Claimstaker Resources) optioned the Alwin property and subsequently earned a 100 per cent interest, subject to a 2.5 per cent net smelter return royalty payable to F.D. Miller. J-Pacific trenched the projected surface exposure of the No. 4 North Zone.

In January 1995 the underground workings were re-opened to help prepare the No. 4 - North orebody for future production. During 1995, Claimstaker Resources Ltd. shipped a few thousand tonnes of oversize high grade copper boulders to Afton (Information Circular 1996-1, page 17). Existing ore reserves are 390,053 tonnes grading 2.5 per cent copper (T. Schroeter, personal communication, 1995).

The Alwin property is 100 per cent owned by J-Pacific Gold Inc., subject to a 2.5 per cent Net Smelter Return. Using a 25 per cent dilution factor, the Alwin property has an inferred resource of 390,090 tonnes of ore grading 2.5 per cent copper, 11.7 grams per tonne silver, and 0.69 grams per tonne gold (J-Pacific Gold website, March 2002). This resource requires confirmation.

EMPR AR *1915-278-280; 1916-265,430; 1918-474; 1919-183; 1922-140;
1930-203; 1966-154; 1967-155; *1968-183-186
EMPR ASS RPT 380, 381, 1028, 23151, 23827
EMPR BULL 56; 62
EMPR EXPL 1979-166; *1980-224
EMPR GEM 1969-262; 1970-346; 1971-342; *1972-153-157; 1973-172;
EMPR INF CIRC 1995-9, p. 17; 1996-1, p. 17
EMPR IR 1984-2, pp. 99, 100; 1984-3, pp. 105, 106; 1984-4, p. 120
EMPR MAP *30; 65 (1989)
EMPR MINING Vol.1 1975-1980; 1981-1985
EMPR OF 1992-1
EMPR PF (Grid location maps, geology maps, claim location maps, drill
location map)
EMR MIN BULL MR 223 B.C. 128
EMR MP CORPFILE (Valley Mining and Development Co.; Highland Valley
Mining Corp. Ltd.; Ashcroft Copper Co. Ltd.; Alwin Mining Co. Ltd.;
D.K. Mining Inc.; De Kalb Mining Corp.)
GSC MAP 1010A; 42-1989
GSC MEM 262, p. 99
GSC OF 980
GSC P 46-8; 47-1A
GSC SUM RPT 1915, p. 88
CIM Jan. 1980
GCNL #184, Sept. 21, 1967; #225, Nov. 22, 1967; #104, May 17, 1968; Aug. 13, 1968; Sept. 13, 1968; #204, Oct. 4, 1968; #13, Jan. 20, 1968; Feb. 3, 1969; #68, Mar. 29, 1969; #135, 1971; #6, 1981; Aug.18, 1983
N MINER Jan.15, 1981
W MINER Oct. 1980 p. 165, Dec. 1980
Financial Examiner Nov. 27, 1968
Mining Magazine July 1971
Northcote, K.E. (1968): Geology and Geochronology of the Guichon
Creek Batholith, British Columbia, Unpublished Ph.D. Thesis, The
University of British Columbia