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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  05-Dec-2013 by Karl A. Flower (KAF)

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NMI 092F14 Cu1,Au1
BCGS Map 092F074
Status Past Producer NTS Map 092F14W
Latitude 049º 45' 48'' UTM 10 (NAD 83)
Longitude 125º 18' 08'' Northing 5514861
Easting 334205
Commodities Copper, Gold, Silver, Arsenic, Molybdenum, Zinc, Lead Deposit Types L04 : Porphyry Cu +/- Mo +/- Au
H04 : Epithermal Au-Ag-Cu: high sulphidation
Tectonic Belt Insular Terrane Wrangell, Plutonic Rocks
Capsule Geology

The Mount Washington Copper deposit is located on a ridge on the north side of Mount Washington, 400 metres north of the Domineer/ Lakeview occurrence (092F 116). A complete exploration history of the area and associated occurrences can be found Assessment Report 30010.

The area of the occurrence is underlain by sediments of the Upper Cretaceous Nanaimo Group, Comox Formation, which unconformably overlie mafic volcanic rocks of the Upper Triassic Vancouver Group, Karmutsen Formation. Intruding both formations is a quartz diorite stock of the Late Eocene to Early Oligocene Mount Washington Intrusive Suite (formerly Catface Intrusions - Massey, N. Personal Communication), dated at 35 million years (+/- 6 Ma) (Carson, 1960). Several later breccias have shattered all other rock types locally. The area is also cut by sub-horizontal thrust faults that control mineralization, and near-vertical faults with a lateral displacement of more than 1.0 kilometre. The Karmutsen Formation comprises basaltic massive and pillow lavas that are commonly porphyritic. The lavas grade into pillow breccias and aquagene tuffs. The overlying Comox Formation comprises fine-grained sandstone and greywacke, with interbedded siltstone. A basal conglomerate of rounded clasts of Karmutsen Formation rocks separates the formations.

The Tertiary quartz diorite stock is variably porphyritic and is centered on McKay Lake northeast of the summit of Mount Washington. Several sills and dykes of diorite, quartz diorite and quartz diorite porphyry are related to the stock.

The Mount Washington Copper deposit is considered to be a porphyry-type deposit with a later superimposed epithermal gold-copper-arsenic event (see 092F 116). Mineralization has been defined over a length of more than 750 metres, and continues further to the south as the auriferous epithermal zone of the Domineer/Lakeview occurrence.

The mineralization is contained in a 1.5 to 7.6 metre wide subhorizontal tabular zone at or near the contact of Comox Formation sediments and the "Pit diorite" sill of the Mount Washington Intrusive Suite. The zone contains a stockwork of chalcopyrite- pyrite-quartz veins, and disseminated chalcopyrite in the sediments and the sill. Low gold and silver values are associated with the veins. Bornite, covellite, realgar, orpiment, pyrrhotite, arsenopyrite, molybdenite, sphalerite and galena are present.

Between 1964 and 1967, 381,773 tonnes of ore was mined from two open pits producing 131 kilograms of gold, 7235 kilograms of silver and 3548 tonnes of copper. An estimated 305,720 tonnes grading 1.07 per cent copper remain adjacent to the open pit (W.G. Stevenson and Associates, 1970).

In 1991, Better Resources completed a program of geochemical sampling and six diamond drill holes, totalling 602 metres, to test the extensions of the mineral zone intersected by Noranda in 1989. In 2008, Blue Rock Resources completed a geological mapping and prospecting program. In 2011, Clibetre Exploration completed a program of geochemical sampling and fifteen holes, totalling 64.8 metres, of overburden drilling on former tailings located 6 kilometres to the east.

EMPR AR 1956-119; 1957-69; 1959-135; 1960-111; 1961-102; 1962-105;
*1963-103-105; 1964-155-156, 157; 1965-A53,A57,235;
1966-A48,A50,71; 1967-A50,A53; 1968-101
EMPR ASS RPT 839, 1120, 1142, 1145, 1691, 4471, 4505, 5146, 5267
5604, 5979, 5980, 6407, 6930, 9445, 11946, 11995, 11996, 12604,
*12605, 14085, *14705, 15228, *15395, 15526, 15776, 15825, 15826,
15857, 15765, 16762, 17123, 17181, 22498, 30010, 32514
EMPR EXPL 1975-E102; 1976-E116; 1977-E115; 1978-E131; 1980-175;
1983-209; 1984-166, 168; 1985-C156; 1986-B29, C181, C184; 1987-
C156-158; 1988-C92,C93
EMPR FIELDWORK *1988, pp. 81-91
EMPR GEM 1969-212; 1970-281; 1973-236; 1974-183
EMPR MER 1986, p. 70
EMPR OF 1994-6; 1998-10
EMPR PF (*W.G. Stevenson and Associates, (1970): Mt.Washington
Exploration Project; various reports, maps, plans and references
in Domineer (see 092F 116); Geological notes, 1983, 1987, 1989;
Better Resources Ltd., Compilation Map, 1986; Better Resources
Ltd., Geochemical and Magnetometer Survey, 1987; J.J. McDougal
Ltd., Summary Report on Mt. Washington Gold Property, 1987;
Better Resources Ltd., Annual Report, 1987; X-Ray Diffraction
Report, 1986; Various Assays, News Releases, GCNL, photos and
maps )
EMR MP CORPFILE (Mount Washington Copper Company Limited; Noranda
Exploration Company; Qualicum Mines Limited; Cumberland Mining
Company Limited)
GSC MAP 49-1959; 2-1965; 17-1968; 1386A
GSC OF 9; 61; 463
GSC P 66-1; 68-50, p. 39,42; 71-36; 72-44
GSC SUM RPT 1924A, pp. 106-144; 1925A; 1930A-64
CIM Transactions #72, p. 116
CMJ Jan., 1965
GCNL #239(Dec.9), 1983; #107(June 4),#129(July 7),#142(July 24),
#178(Sept.16),#194(Oct.8),#214(Nov.6), 1986; #14(Jan.21),
#91(May 12),#135(July 15),#147(July 31),#176(Sept.14),#187
(Sept.29),#191(Oct.5),#225(Nov.24), 1987; #12(Jan.19),#177
(Sept.14),#187(Sept.28), 1988
N MINER Jan.5, 1984; Sept.28, 1987
PERS COMM: Nick Massey, May 1990
W MINER Nov. 1965, p. 35; Nov 1967, pp. 35-40
Carson, D.J.T., (1960): Geology of Mount Washington, Vancouver
Island, British Columbia, M.Sc. Thesis, University of British
Carson, D.J.T., (1968): Metallogenic Study of Vancouver Island with
Emphasis on the Relationship of Plutonic Rocks and Mineral
Deposits, Ph.D. Thesis, Carleton University
Hudson, R. (1997): A Field Guide to Gold, Gemstone & Mineral Sites of
British Columbia, Vol. 1: Vancouver Island, p. 157
McGuigan, P.J., (1975): Certain Breccias of Mount Washington
Property, Vancouver Island, B.Sc. Thesis, University of British
Mount Washington Copper Company Limited, (1971): Statement of
Material Facts, May 26, 1971