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File Created: 24-Jul-85 by BC Geological Survey (BCGS)
Last Edit:  20-Jun-13 by Nicole Barlow(NB)

Summary Help Help

NMI 082M12 Cu1
Name HARPER CREEK, HAIL-HARPER CREEK Mining Division Kamloops
BCGS Map 082M051
Status Developed Prospect NTS Map 082M12W
Latitude 51º 31' 10" N UTM 11 (NAD 83)
Longitude 119º 49' 04" W Northing 5711356
Easting 304511
Commodities Copper, Silver, Gold, Titanium, Zinc, Lead, Molybdenum Deposit Types G06 : Noranda/Kuroko massive sulphide Cu-Pb-Zn
Tectonic Belt Omineca Terrane Kootenay
Capsule Geology

The Harper Creek deposit lies 3500 metres north of the Cretaceous Baldy batholith and within metavolcanics and metasediments of the Lower Cambrian and older(?) to Mississippian Eagle Bay Formation.

Copper mineralization is confined to tabular-shaped zones within light silvery grey quartz-sericite phyllites, with lesser amounts of green chloritic phyllite, dark grey carbonaceous phyllite and light grey sericitic quartzite. These rocks locally include thin horizons of quartz-feldspathic orthogneiss.

Chalcopyrite occurs as disseminations and patches along foliations, in steeply dipping, northerly striking fractures, within quartz and quartz-carbonate veins and with massive pyrite-pyrrhotite. Sphalerite, galena, arsenopyrite, molybdenite, tetrahedrite- tennanite, bornite and cubanite are present in minor quantities. Magnetite occurs locally as massive lenses containing minor chalcopyrite.

Sphene occurs evenly disseminated or in clusters within chloritic phyllite. Rocks with 15 to 20 per cent sphene contain an average of 2.0 per cent titanium (Property File - Belik, 1973).

The tabular mineralized zones strike approximately east and dip about 25 degrees to the north, in approximate conformity with the schistosity and lithology of the host rocks. In detail, however, the zones transgress lithologic contacts and are not stratigraphically controlled. The main mineralized zone is about 1800 metres long, has a local thickness of 100 metres and has been explored downdip for 600 metres. A north-northeast trending, southeast dipping fault cuts the zone midway.

The East zone contains indicated open pittable reserves of 53 million tonnes grading 0.37 per cent copper and 0.016 per cent molydenum. Bench-scale tests indicate 2.8 grams per tonne gold and 88.4 grams per tonne silver. There are also significant titanium values (Application for Listing 14/87, Aurun Mines Ltd.).

By 1997, American Comstock Exploration Ltd. had aquired a 100 per cent interest in the project and had conducted a 9-hole diamond drilling program (in 1996). A 171-metre intersection assayed 0.31 per cent copper (Exploration in BC 1996, page D5). The program was designed to increase a previously calculated geological resource of 96 million tonnes grading 0.41 per cent copper, 0.045 gram per tonne gold and 2.5 grams per tonne silver (Information Circular 1997-1, page 29).

Yellowhead Mining acquired the Harper Creek project in 2005.

In March 2011 Yellowhead Mining released a Preliminary Economic Assessment Report which included updated resource amounts as follows: (Stockwatch News Release March 8, 2011)
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Category Amount (tonnes) Cu(%) Au(g/t) Ag(g/t)
Measured 89,992,900 0.30 0.033 1.18
Indicated 442,071,100 0.31 0.032 1.06
Inferred 117,236,900 0.29 0.032 1.32
Calculated at 0.20 per cent Cu cut-off
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In December 2011, drilling at Harper Creek totalled 318 holes for 78 164 metres, not including eight geomechanical holes.

In December 2012, Yellowhead Mining started an 11,000-metre infill drilling program aimed at upgrading the category of resources within the pit area and allowing for more detailed mine planning and potential exploration benefits.

Yellowhead Mining's 2012 announcement of its updated resource estimate showed that its program of infill and step-out drilling expanded the resource by 47 per cent. The measured and indicated resource at a 0.2 per cent copper cut-off grade stands at 814 997 000 tonnes at 0.29 per cent copper, 0.032 gram per tonne gold and 1.3 grams per tonne silver. A further 80 169 000 tonnes at 0.3 per cent copper, 0.033 gram per tonne gold and 1.4 grams per tonne silver are estimated in the inferred resource category. (www.yellowheadmining.com).

Bibliography
EMPR AR 1967-132,284; 1968-165,281
EMPR EXPL 1996-D5; 2009-57; 2010-82-83
EMPR FIELDWORK 1985, pp. 89-94
EMPR GEM 1969-229; *1970-297-301; 1971-443; 1972-93; 1973-116-117; 1974-98
EMPR INF CIRC 1997-1, p. 29
EMPR MAP 65 (1989)
EMPR OF 1992-1
EMPR PF (*Geology of the Harper Creek Copper Deposit - Thesis by G. Belik, 1973; Letter to Shareholders, Aurun Mines Ltd., July 8, 1986; For Immediate Release - Aurun Mines Ltd. Press Release, 1988; Notes-Harper Creek, T. Schroeter, 1996; Property Summary - Harper Creek, Aurum Mines Ltd., 1986; Re: Yellowhed Mining Inc. - Harper Creek Project, T. Schroeter, 2007; RE: Regional geology monthly report, M. Cathro, 1996; Re: Harper Creek, C. Wilson, 1988; KEG press release - Harper Creek Project, Yellowhead Mining Inc., 2006; Roundup press release - Harper Creek Project, Yellowhead Mining Inc., 2008; Aerial Photo - Harper Creek B.C., 1974; Surface Plan Map - Harper Creek Joint Venture, 1972; Geological Plan Map of the Harper Creek Joint Venture, 1974)
EMR MIN BULL MR 223 B.C. 77
GCNL #209, 1978
N MINER May 18, 1986
STOCKWATCH Mar.8,2011
Dickie, G.J., V.A. Preto and P. Schiarizza (in preparation): Mineral Deposits of the Adams Plateau-Clearwater area
Preto, V.A. and P. Schiarizza (1985): Geology and Mineral Deposits of the Adams Plateau and Clearwater Region in GSA Cordilleran Section Meeting May 1985, pp. 16-1 to 16-11.

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