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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  26-Mar-2018 by Karl A. Flower (KAF)

Summary Help Help

NMI
Name LORI, MAMQUAM RIVER, ALCO, COPPER Mining Division New Westminster
BCGS Map 092G076
Status Prospect NTS Map 092G10W
Latitude 049º 42' 34'' UTM 10 (NAD 83)
Longitude 122º 55' 25'' Northing 5506329
Easting 505507
Commodities Copper, Molybdenum Deposit Types L04 : Porphyry Cu +/- Mo +/- Au
Tectonic Belt Coast Crystalline Terrane Plutonic Rocks
Capsule Geology

The Lori occurrence is located on the north east side of the Mamquam River near Martin Creek, approximately 16 kilometres east of Squamish.

The area is underlain by Late Jurassic quartz dioritic intrusive rocks, of the Tertiary to Jurassic Coast Plutonic Complex, which are cut by a swarm of andesitic dikes. Basaltic volcanic rocks of the Pliocene to Holocene Garibaldi Group and marine sedimentary and volcanic rocks of the Lower Cretaceous Gambier Group outcrop to the west.

Locally, a diorite to quartz diorite hosts pyrite, chalcopyrite, molybdenite, chalcocite and bornite mineralization as fracture fillings and disseminations in the host rocks, and in quartz veins associated with quartz, orthoclase, k-feldspar, chlorite and epidote alteration. The mineralized fractures generally strike 050 to 090 degrees, dip moderately south and are haloed by an extensive zone of pyritic and propylitic alteration. Mineralization has been traced for over 60 metres in two locations from a wider zone of mineralization over 1050 by 300 metres.

In 1973, samples of the mineralized zone yielded up to 0.6 per cent copper and 0.05 per cent molybdenum (Assessment Report 4916). Later the same year, a sample of drill core, from drill hole NM1, assayed 0.22 per cent copper and 0.008 per cent molybdenum, over 3.1 metres, between 45.7 metres and 48.8 metres (Sample P4016; Assessment Report 4917).

In 1979, grab samples yielded up to 0.76 per cent copper and 0.32 per cent molybdenum (Assessment Report 7386). Drilling, performed later the same year, yielded up to 0.46 per cent copper and 0.01 per cent molybdenum over 0.6 metres from hole B-7, while another hole (B-15) yielded 0.43 per cent copper and 0.01 per cent molybdenum over 7.5 metres, including 1.5 metres yielding 1.20 per cent copper and 0.01 per cent molybdenum (Assessment Report 7739). The highest molybdenum values come from hole B-13, which yielded 0.13 per cent copper and 0.03 per cent molybdenum over 10.5 metres, including 1.5 metres yielding 0.30 per copper and 0.16 per cent molybdenum (Assessment Report 7739).

In 1971, Minorex Consulting soil sampled the area as the Lori claims. The following year, Exeter Mines completed a program of line-cutting and soil sampling on the area. In 1973, Noranda completed a program of geological mapping, minor sampling, a ground induced polarization survey and three diamond drill holes, totalling 276 metres, on the area. In 1979 and 1980, Amark Resources completed programs of prospecting, soil sampling, a ground electromagnetic survey, 20 percussion drill holes, totalling 195.8 metres, and one 37.2- metre diamond drill hole on the area as the Alco claims.

During 2012 through 2015, Billiken Gold completed programs of soil and till heavy mineral and rock sampling on the area as the Copper 1-5 claims. This work identified fine particles of angular gold with pyrite and chalcopyrite on a ridge, approximately 3 kilometres to the north west.

Bibliography
EMPR ASS RPT 3294, 3793, 4467, *4916, *4917, 4918, *7386, *7739, 8749, 33960, 34772, 35908
EMPR EXPL 1977-118; 1979-136
EMPR FIELDWORK 1980, pp. 165-184
EMPR GEM 1971-255; 1972-275; 1973-238; 239
GSC MAP 1069A; 1151A; 1386A
GSC MEM 335
GSC P 89-1E, pp. 177-187; 90-1E, pp. 183-195; 90-1F, pp. 95-107
Ditson, G.M. (1978): Metallogeny of the Vancouver-Hope Area,
British Columbia, M.Sc. Thesis, University of British Columbia

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