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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  23-Jul-2018 by George Owsiacki (GO)

Summary Help Help

NMI 093F7 Cu1
Name CHU Mining Division Omineca
BCGS Map 093F038
Status Developed Prospect NTS Map 093F07E
Latitude 053º 21' 54'' UTM 10 (NAD 83)
Longitude 124º 34' 36'' Northing 5914033
Easting 395088
Commodities Molybdenum, Copper Deposit Types L05 : Porphyry Mo (Low F- type)
Tectonic Belt Intermontane Terrane Stikine
Capsule Geology

The Chu occurrence is located in the Nechako Range about 6.5 kilometres west of Chutanli Lake approximately 82 kilometres south-southwest of Vanderhoof.

The region in which the Chu showing occurs is underlain dominantly by Lower to Middle Jurassic volcanic and sedimentary rocks of the Hazelton Group. These assemblages are overlain by the Eocene Ootsa Lake Group intermediate to felsic volcanic rocks and Miocene Chilcotin Group plateau basalt. Intruding Lower Jurassic rocks in the northeastern part of the map sheet is a belt of granodiorite, diorite and quartz diorite plutons of the Lower Jurassic Topley intrusive suite. Felsic plutons of probable Cretaceous age intrude Lower and Middle Jurassic Hazelton strata.

The Chu property covers the contact zone between an Eocene granitic to granodioritic pluton and hornfelsed Hazelton Group rocks. The Hazelton Group in this area is a mixed assemblage of epiclastic and volcaniclastic sedimentary rocks, volcanic rocks and felsic intrusives. Drilling in 1985 intersected rocks of dacitic, andesitic and rhyolitic compositions along with argillite, graphitic "schist', and monzonite.

In outcrop, mineralization consists of molybdenite with minor pyrite, pyrrhotite and chalcopyrite as disseminations and coatings along fractures in biotite-altered argillite.

Historical diamond drilling indicates a potential grade of approximately 0.1 per cent molybdenum (Assessment Report 24114).

Rio Tinto Canadian Explorations Ltd. and Asarco (American Smelting and Refining Company) discovered the Chu molybdenum property independently during 1969 to 1970. In the mid-1970s, Asarco consolidated the project areas and carried out a number of geological, geochemical and geophysical surveys and shallow diamond drilling. In 1979, they were joined by Armco Mineral Exploration Ltd. in a joint venture. They conducted core drilling pngrams in 1980 (three diamond-drill holes), 1981 (seven diamond-drill holes and 1982 (two diamond-drill holes). This fieldwork has partially outlined a large northwest-trending zone of strong molybdenum-bearing mineralization.

In 1981, Chevron Standard Limited staked the Nechako Range claims to the north of the Chu showing to cover similarly favourable ground. These included the Python claims (1 kilometre north), the Nautical claims (immediately west of Brewster Lakes), the Gypsy claims (on Earhorn Creek, 18.5 kilometres to the northwest) and the B.B. claims (on Big Bend Creek, 14 kilometres to the north). Geological mapping, soil geochemistry and ground geophysical surveys were performed on the properties. An additional program of geochemical soil and sampling and two diamond-drill holes (274.5 metres) were completed on the Python and Gypsy claims.

During 1981-82, Amarco Mineral Exploration completed a limited program of diamond drilling (798 metres) and geological mapping on the Chu property. The best intersection yielded 0.184 per cent MoS2 over 45 metres (Property File Chevron - Ostensoe, E., 1982).

In 1994, the Chu and Chu 2 and 3 claims were staked by Arnex Resources Ltd. when the original property claims lapsed. Sixteen stream sediment and three rock chip samples were taken. The registered owner was Orvana Minerals Corp. Some work may have been done by Orvana in 1995 also.

In 2002, a magnetometer survey consisting of 34.1 kilometres was conducted by owner Chris Delorme over a portion of the Chu molybdenum property.

In 2003, Nustar Resources Inc. evaluated the Chu porphyry molybdenum prospect. The company sampled and re-assayed core from a 1970 Rio Tinto drilling campaign, and also conducted geological mapping, geochemical sampling and geophysical surveys.

In 2004, the work program of owner Omega Exploration Services Inc. consisted of running three self potential (SP) lines totalling 3600 metres and drilling one vertical drillhole with a hand-held JKS packsack diamond core drill to a total depth of 20.1 metres. The indicated zone of molybdenum mineralization is large and appears to dip into the southwest-facing slope of the hill. The mineral zone was reported to have excellent potential for expansion from its present indicated size toward the northwest, southeast, downdip toward the northeast, and possibly in the apparent width toward the southwest. The current approximate dimensions are 840 metres length by 400 metres width by an apparent depth of 600 metres.

In May 2010, TTM Resources Inc. announced updated resource figures (Technical Report for TTM Resources dated July 5, 2010 -


Category Amount (tonnes) Mo% Cu%


Measured + Indicated 370,640,000 0.059 0.035

Inferred 256,560,000 0.052 0.036


EMPR GEM 1969-155; 1970-111
EMPR EXPL 1977-E186; 1979-215; 1980-322; 1982-291; 1992-69-106; 2003-25
EMPR FIELDWORK 1993, pp. 9-14
EMPR OF 1995-13; 1995-17
EMPR PF (Claim Map)
EMPR PF Chevron (Chedakuz Creek map showing Gypsy, Python, Nautical and B.B. claims; Chemex Labs Ltd. (1981-03-12): Geochemical Certificates of Analysis - A8115504 - Bugsy, Mukaluk, Python, Slippery, Gypsy Claims; Northcote, K.E. (1981-12-31): Geological and Geochemical Report on the Gypsy, Python, Nautical and B.B. claims of the Nechako Range Area; Northcote, K.E. (1982-12-31): Supplemental Report - Diamond Drilling and Soil Geochemistry of Python and Gypsy Claims; Armco Mineral Exploration Ltd. (1982-12-31): Chu Project - Geology Map of Chu Property ; Ostensoe, E. (1982-12-31): Chu Project - 1982, Summary and Recommendations, Armco Mineral Exploration Ltd.)
GSC P 90-1F, pp. 115-120
GSC MAP 1131A; 1424A
PR REL Nustar Resources Inc., Apr.29, Jun.13,23, Oct.6, Nov.4, 2003; Aug.23, 2004; TTM Resources Inc., Sept.11, 2006; Mar.2, May 4, 2009, May 21, 2010