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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  16-Mar-2006 by Garry J. Payie (GJP)

Summary Help Help

BCGS Map 092I057
Status Prospect NTS Map 092I10E
Latitude 050º 35' 01'' UTM 10 (NAD 83)
Longitude 120º 39' 30'' Northing 5606140
Easting 665771
Commodities Molybdenum Deposit Types L05 : Porphyry Mo (Low F- type)
Tectonic Belt Intermontane Terrane Quesnel
Capsule Geology

The Roper Lake prospect is underlain by volcanics and minor intercalated sediments of the Upper Triassic Nicola Group intruded by a younger (possibly Tertiary) zoned quartz monzonite stock (Roper Lake stock). Intermediate to mafic dikes cut both the intrusion and Nicola rocks. The Roper Lake stock is a northwesterly trending, elliptically-shaped intrusion approximately 1600 metres long by about 800 metres wide. Geological and geophysical evidence suggests that the stock plunges steeply northeast. A northwesterly striking fault is postulated to be present east of the intrusion proper and an outlier of the stock occurs on the upthrown side of this fault.

The bulk of the Nicola rocks consist of greenish grey, semi-porphyritic andesites and basalts. In the vicinity of the Roper Lake stock, the Nicola rocks are baked to a hard, flinty, hornfelsic rock and pyrite is abundant. The composition of the Roper Lake stock approximates a quartz monzonite. A crude zoning was noted in the intrusion with a core of quartz-eye porphyry grading outward to a medim to fine grained quartz monzonite, slightly porphyritic in part. Quartz veining of several generations is commonly seen throughout the stock; usually these veins are narrow (1 centimetre or less) although veins as wide as 25 centimetres are present.

Pyrite is ubiquitous but is usually more abundant in the Nicola rocks, particularly in the thermally altered rocks adjacent to the stock and in the northern part of the property. The pyrite is usually fine grained and occurs along fractures or as disseminated grains in Nicola rocks. Where quartz veins are abundant as in the outer shell of the stock and the contact zones, pyrite frequently occurs as disseminated grains or small clusters within the veins.

Molybdenite is the only other sulphide mineral seen on the property. It is widely distributed throughout the stock and also occurs in peripheral areas of the intruded Nicola rocks. It is invariably fine grained and is most frequently found in quartz veins but does occur as 'paint' along dry fractures or as disseminated grains in intrusive rock. Such disseminated grains are seldom more than few centimetres away from a quartz vein. Commonly, molybdenite is seen as small clumps of very fine grained crystals or 'dust' scattered irregularly through narrow (1 centimetre or less) quartz veins. The widest mineralized quartz vein is exposed in a trench in the contact zone about 200 metres north of Roper Lake. Here a 25 centimetre wide vein in a dike of intrusive material is heavily mineralized with very fine grained molybdenite occurring as numerous sheets of semimassive material up to several millimetres wide that parallel the vein walls.

Percussion and diamond drilling has outlined a semicircular annulus of higher molybdenum values along the northeastern side of the intrusion and in the adjacent country rock. A 1981 drillhole by Cominco Ltd. intersected molybdenum mineralization to a depth of 346 metres. Molybdenite occurs principally as fine fracture and open-space fillings in quartz stockwork. Heavy molybdenite is occasionally noted in gouge zones and disseminated molybdenite may be found in the areas between fractures; pyrite is ubiquitous. A 10-metre intersection between 340 and 350 metres depth assayed 0.132 per cent molybdenum (Assessment Report 9319).

The Roper Lake prospect was discovered in the 1950s but serious exploration work did not commence until 1966. In 1960, work began on the DRG claims by Kennco Explorations (Western) Limited and consisted of geological mapping, soil sampling, and induced polarization (13 kilometres), ground magnetometer (15 kilometres) and self-potential (13 kilometres) surveys. In 1966, Dominic Lake Mining Co. Ltd. conducted a soil sampling (1911) survey over the Spur and TC claims. In 1966, geochemical and magnetometer surveys, 457 metres of surface trenching and 12.8 kilometres of new road was built on the Spur group by Tro-Buttle Explorations Limited. In 1967, Dominic Lake Mining Ltd. conducted geological mapping, magnetometer and geochemical surveys, 3.2 kilometres of road building, 15 diamond-drill holes totalling 745 metres and 9 percussion-drill holes totalling 306 metres on the TC group. In 1969, Tro-Buttle Exploration Ltd. conducted geological mapping, prepared a topographic map and completed a magnetometer survey (30 kilometres) on the TC and Spur claims. In 1971, a soil geochemical (271) survey was completed by Tro-Buttle Exploration Limited on the Spur claims. In 1972, Dominic Lake Mining Company Ltd. performed geological mapping, a magnetometer survey (71 kilometres) and soil (877) geochemical survey. In 1976, on behalf of J.R. Kerr, geological mapping and line cutting were conducted on the Happy Days claim which now covers the showing. In 1978-80, Cominco Ltd. conducted induced polarization surveys (40.5 kilometres), ground magnetometer survey (50 kilometres), line cutting and 32 percussion-drill holes totalling 2478 metres on the Happy Days claims. In 1981, Cominco Ltd. submitted results on one diamond-drill hole totalling 346 metres which was drilled as part of a larger drilling program on the Happy Days claims; Cominco returned the claims to Keda Reources (now K.D. Resources Inc.). In 1984, a limited soil sampling survey (98 samples) was completed on the Happy Days claim on behalf of K.D. Resources Inc.

In early 2005, Global Hunter Corp. was the operatory of the property. Their historical summary of the Rabbit South property indicates that seventy percussion holes had been drilled to an average depth of 80 metres and with several confirmation diamond drill holes, a large horseshoe-shaped area of molybdenum mineralization measuring 2,500 metres long and between 400 and 500 metres wide, remaining open to the east, had been indentified. This mineralization is associated with the Roper Lake granitic stock and occurs from surface to depths of approximately 100 metres. Highlights of the previous drilling include intersections of: 0.080 per cent molybdenum over 77.1 metres (Global Hunter Corp., Press Release, April 15, 2005). Later in 2005, Global Hunter Corp. drilled 2390 metres which confirmed previous drilling.

EMPR AR 1966-148; 1967-148
EMPR ASS RPT 325, 1009, 2102, 3458, 4110, *6149, 6579, 6579, 7052
*7436, *7764, 8580, *9319, 12698
EMPR EXPL 1976-E100; 1977-E157,E158; 1978-E169; 1979-176; 2003-55; 2004-58; *2005-59
EMPR GEM 1969-238; 1971-297,298; 1972-200
EMPR PF (Sketch maps of property outline, geology and workings, 1966)
GSC OF 165; 980; 2490
GSC MAP 886A; 887A; 9-1963; 1394A; 42-1989
GSC P 44-20; 82-1A, pp. 293-297; 85-1A, pp. 349-358
PR REL Auterra Ventures Inc., Jan 24, 28, 2003; Jan.20, 2004; Ballad Gold and Silver Ltd and Auterra Ventures Inc., Mar.19, May13, Jul.14,15,16, 2004; Global Hunter Corp., *Apr.15, 2005
Chevron File (Year-end reports, 1980-81; Drillhole collar plan map;
Drillhole sections; Claim map)