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File Created: 24-Jul-85 by BC Geological Survey (BCGS)
Last Edit:  20-Aug-99 by Janet M. Riddell(JMR)

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NMI 092N5 Cu1
Name HOODOO NORTH, VAN 43-46, 49-50, 83-84, BZT 3, 5-8, HOODOO CREEK, MAIN GULLY, BZT 1-9 Mining Division Vancouver
BCGS Map 092N032
Status Prospect NTS Map 092N05E
Latitude 51º 21' 25" N UTM 10 (NAD 83)
Longitude 125º 35' 58" W Northing 5692727
Easting 319015
Commodities Copper, Molybdenum, Silver, Zinc, Lead, Tungsten Deposit Types L08 : Porphyry Mo (Climax-type)
Tectonic Belt Coast Crystalline Terrane Plutonic Rocks, Undivided Metamorphic Assembl.
Capsule Geology

The Hoodoo North occurrence covers the eastern part of the Hoodoo Creek property, on the north side of Hoodoo Creek, 30 kilometres north of the head of Knight Inlet. The Hoodoo South occurrence (092N 034), on the western side of the property, is 4.5 kilometres to the west-southwest.

Kennco Explorations (Western) Limited in 1968 held the Hoodoo North showings as the Van group of claims. Geological and geochemical surveys were carried out. Amax Incorporation, through Amax Potash Limited, staked the property as the BZT 1 to 9 claims (103 units) with BZT 1 covering Hoodoo South and BZT 5-8 Hoodoo North. Work during 1977-78 included geological mapping and geochemical soil and rock chip surveys (515 samples). Subsequent work was under a 50-50 joint venture agreement with Utah Mines Limited. Canamax Resources Incorporated was incorporated in December 1982 to consolidate Amax's Canadian exploration interests; a 63.9 per cent interest in the new company was held by Amax of Canada Limited.

The Hoodoo North occurrence lies within the Jurassic to Tertiary Coast Plutonic Complex. The oldest rocks in the area consist of garnet-bearing granitoid gneisses of probable Mesozoic age, hornblende diorite, quartz diorite and granodiorite. In the property area, these rocks are intruded by a complex of late Tertiary felsic to intermediate stocks, breccias and dikes, and their extrusive equivalents, which contain evidence of a porphyry-type copper-molybdenum deposit at depth. The Hoodoo North occurrence is associated with these Tertiary rocks, which are marked by a broad pyritic halo. Most previous work has centred around a drainage known as Main Gully (Assessment Report 8218, Map 1).

Age relationships between the numerous Tertiary units are uncertain; the more important ones are described here in apparent chronological order. Possibly the oldest is a quartz monzonite stock with fractures containing pyrite, chalcopyrite and molybdenite. Similar in relative age is a heterolithic intrusive breccia of Miocene to Pliocene age, which forms a pipe-like body about 1 kilometre in diameter. This breccia has sericitic and propylitic alteration and is pyritized (up to 5 per cent) at its margins; minor chalcopyrite, sphalerite and rare malachite are present in veins. Locally, clasts of a white siliceous rock contain molybdenite.

A quartz-feldspar-biotite porphyry stock and associated dikes contain pyrite, and minor chalcopyrite and molybdenite in quartz-filled fractures. A sample has been dated at 13.9 Ma +/- 1.5 Ma (Middle Miocene) by the potassium-argon method using a highly chloritized biotite separate (Assessment Report 7415). This unit may be the source of a reported chip sample assaying 0.23 per cent copper, 1.9 per cent zinc and 15.8 grams per tonne silver (Assessment Report 6819).

A prominent, northwesterly-trending swarm of dacitic dikes contains very minor disseminated pyrite and chalcopyrite; a dacitic breccia in Main Gully contains 10 to 15 per cent pyrite, and minor disseminated chalcopyrite.

A pyritic (4 to 7 per cent) quartz porphyry stock with pervasive sericitic alteration has been a primary target for porphyry molybdenum mineralization; it allegedly has geochemical characteristics similar to the Climax and Henderson molybdenum orebodies of Colorado (Assessment Report 9377). It contains minor molybdenite in disseminations and in small quartz veinlets. Drilling indicates that silica-flooding and quartz stockwork veinlets with weak chalcopyrite, molybdenite and sphalerite mineralization increase with depth. Values up to 0.011 per cent molybdenum, 0.085 per cent copper and 0.39 per cent zinc have been reported (Assessment Report 8218).

A feldspar porphyry has been dated at 10.0 Ma +/- 0.7 Ma (Late Miocene, whole rock, method unknown; Assessment Report 7415). Distinctive quartz-feldspar porphyry and feldspar-hornblende-quartz porphyry dykes occur in steeply northeast-dipping, northwest-trending swarms covering at least 2000 by 500 metres. They show argillic and sericitic alteration of feldspars, and up to 1 per cent disseminated pyrite; values up to 0.14 per cent zinc have been obtained from drill core (Assessment Report 8218).

A 600-metre thick outlier of laharic breccia and associated andesitic tuffs, with crude stratification dipping gently west, may be the extrusive equivalent of the intrusive breccia described above. Locally, clasts contain veins of pyrite and chalcopyrite. A rhyolitic breccia unit has minor disseminated pyrite and fault-controlled carbonate alteration.

Although most attention has been paid to the Tertiary complex, the older gneisses host widespread quartz veins, commonly mineralized with pyrite, chalcopyrite, sphalerite and galena; assay values up to 0.31 per cent copper and 0.98 per cent zinc are reported (Assessment Report 8218). A quartz-pyrite vein (host not specified) contained 0.12 per cent tungsten (Assessment Report 7415).

Locally, faults and shear zones host highly oxidized veins, up to 20 centimetres thick, containing quartz, pyrite, chalcopyrite and sphalerite.

Bibliography
EMPR ASS RPT 1668, 6819, *7415, *8218, 9377
EMPR EXPL 1977-E175; 1978-E183; 1979-192; 1980-278; 1981-26;  2002-29-40
EMR MP CORPFILE (Canamax Resources Inc.)
GSC OF 1163
PR REL Saxony Explorations Ltd., Dec.18, 2002

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