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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  24-Jun-2013 by George Owsiacki (GO)

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NMI 104J8 Cu2
Name HU, HUEY, STAIN CREEK Mining Division Liard
BCGS Map 104J040
Status Prospect NTS Map 104J08E
Latitude 058º 20' 41'' UTM 09 (NAD 83)
Longitude 130º 11' 27'' Northing 6467707
Easting 430291
Commodities Copper, Gold, Molybdenum Deposit Types L03 : Alkalic porphyry Cu-Au
Tectonic Belt Intermontane Terrane Plutonic Rocks, Stikine
Capsule Geology

The HU occurrence is located near "Stain Creek", a tributary to Tanzilla River, about 15.5 kilometres south-southwest of the community of Dease Lake.

The showing area is underlain by northwest striking volcanic and sedimentary rocks of the Upper Triassic Stuhini Group which have been intruded by an Early to Middle Jurassic diorite to monzonite body and an east trending composite syenite body. Basaltic and felsic dikes also occur.

The volcanic sequence comprises predominant crystal lithic tuffs intercalated with crystal tuffs, lapilli tuffs and tuff breccias which dip from 40 to 75 degrees north to 50 to 60 degrees south. These are underlain by augite and feldspar porphyry andesite. The volcaniclastic sedimentary sequence include tuffaceous argillite, siltstone and greywacke. The sediments are usually well bedded, locally display graded bedding and strike 340 degrees with variable dips. Small lenses of limy argillites and tuffaceous siltstone, exposed by trenches, have been partially altered to skarn and hornfels.

The intrusive rocks include coarse grained hornblende-biotite diorite or monzonite, fine-grained diorite, and foliated hornblende diorite or monzonite. These rocks normally contain abundant magnetite. A variety of syenitic rocks comprise an irregular, east-west elongate body and consist of medium to coarse grained, equigranular to slightly porphyritic syenite, aplitic biotite syenite, aphanitic syenite (may be altered andesite), and hornblende biotite syenite (may be K-feldspathized diorite or monzonite).

Several felsite dikes are exposed in trenches where surrounding lapilli tuffs and sediments are intensely hornfelsed, partially bleached, and contain disseminated pyrrhotite, pyrite and chalcopyrite. The felsite dikes strike west-northwest or northwest and are vertical. Their widths vary from 0.6 to 9 metres. Carbonate altered, pyritic fault and shear zones cut sediments, volcanic rocks and syenite.

The alteration assemblage on the property is consistent with those associated with alkalic porphyry deposits. Alteration observed includes hornfels, skarn, patchy clay-carbonate associated with shear structures and, potassic alteration with associated copper mineralization.

Potassic alteration consists of potassium feldspar, epidote, chlorite, magnetite and biotite and is predominantly found along "Stain Creek" where it is closely associated with chalcopyrite mineralization. This alteration is weakly developed in diorite, but strong in areas of intense fracturing or faulting within and in close proximity to the syenite or monzonite intrusive rocks. Hornfelsing and amphibole-magnetite-epidote skarns are found in the volcanic and sedimentary units. A trench exposes a skarn for at least 15 metres within interbedded crystal tuffs and andesitic flows. Hornfelsing is weak to non-existent except along the edges of the felsite dikes.

Copper mineralization is evident in two areas on the property: within a trench north of "West Branch Creek", and in the upper parts of "Stain Creek". Large gossans observed at "Stain Creek" result from weathering of fracture fillings and disseminated pyrite within the shattered hostrocks. Numerous potassic altered zones trending either in a northerly or easterly direction and hosted within intrusive and volcanic rocks or along their contact, contain abundant pyrite with or without chalcopyrite and malachite. Significant chalcopyrite is confined to fault zones or intensely fractured areas along a 100-metre long exposure. Moderate to intense potassic alteration is associated with the fracturing or surround the fault zones, which are usually marked by a recessive clay gouge. The highest copper values are from areas of intense fracturing where grab samples yielded up to 1.14 per cent copper. High gold values were obtained from a fault contact, where a grab sample from fault gouge yielded 1.3 grams per tonne gold (Assessment Report 21707, page 12).

In a trench north of "West Branch Creek", about 3000 metres west of the mineralization at "Stain Creek", trace chalcopyrite, pyrite and molybdenite occurs along fractures in syenite.

In 2007, rock sampling in a 50 metre wide zone of structurally controlled quartz and carbonate vein mineralization in the upper part of the section averaged 0.30 per cent copper and 0.06 gram per tonne gold (samples 147703-147705 and 149515-149519). Strongly pyritic zones are associated with syenite below this zone, but generally contain very low copper values. Basaltic andesite above this zone is only weakly mineralized (Assessment Report 29434).

The HU 1-32 claims were staked in June 1969 on behalf of Tournigan Mining Explorations Ltd., after the investigation of a gossan zone at the head of Stain Creek. Later in the summer Silver Standard Mines Limited optioned the property and staked an additional 30 claims (HU 33-62). Work by Silver Standard in 1969 and 1970 included trenching, geological mapping, and a geochemical soil survey over nearly 20 line miles. The option was allowed to terminate in September 1970. During 1972, Tournigan Mining carried out an induced potential survey over 16.6 line-miles covering the east end of the property, and a geochemical soil survey over the southeast part of the property. Amax Exploration Inc. optioned the property in June 1973 and carried out geological mapping over two square miles, a geochemical survey (283 samples of which 206 were soil samples), and a magnetometer survey over 28 line-miles. The option agreement was terminated in November 1973. In 1990, the Huey and Duey claims were staked to cover the showing and in 1991 Equity Engineering Ltd. carried out a limited exploration program consisting of geological mapping, prospecting, silt sampling and soil sampling. In 2007, Paget Resources Corporation examined the property and collected 23 rock samples from a well- exposed section along Stain Creek in the eastern part of the property. In addition, two silt samples were taken from Stain Creek above and below a section of strongly gossanous alteration.

Bibliography
EMPR PF (Report to Shareholders, Tournigan Mining Explorations Ltd., Spring-Summer 1974; Report by D.R. Cochrane, 1971; Prospectus, Tournigan Mining Explorations Ltd., October 21, 1971 in 104I 042; 104J General File - Claim map 73M, Dec. 1970)
EMPR GEM 1969-44; 1970-37,38; 1972-551,552; 1973-513
EMPR ASS RPT 3736, 3737, *4399, 19009, *21707, *29434
EMPR OF 1996-11
GSC OF 707; 2779
GSC BULL 504
GSC MAP 9-1957; 21-1962; 1418A; 1712A; 1713A
GSC SUM RPT 1925, Part A, pp. 33A-99A
EMR MP CORPFILE (Tournigan Mining Explorations Ltd.)
Chevron File

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