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File Created: 31-May-2018 by Garry J. Payie (GJP)
Last Edit:  20-May-2019 by Garry J. Payie (GJP)

Summary Help Help

NMI
Name FAR WEST, SPECTRUM Mining Division Liard
BCGS Map 104G068
Status Showing NTS Map 104G09W
Latitude 057º 41' 39'' UTM 09 (NAD 83)
Longitude 130º 30' 23'' Northing 6395650
Easting 410200
Commodities Copper, Molybdenum, Gold Deposit Types L04 : Porphyry Cu +/- Mo +/- Au
Tectonic Belt Intermontane Terrane Stikine
Capsule Geology

The Far West area is located 1200 to 1500 metres northwest of the Spectrum Central Zone (104G 036), both part of the Spectrum property.

The area of the Far West occurrence is underlain by the contact of Upper Triassic volcanics of the Stuhini Group and volcanic rocks of the Tertiary to Quaternary Mount Edziza Complex. The showing is exposed on a series of steep, strongly gossanous, quartz-sericite-pyrite altered outcrops which are situated in the hangingwall of a west-northwest-trending normal fault.

The area was covered by coarse grid-based soil sampling in 1984, but soil analysis was limited to copper, gold and arsenic. In 1990, two small trenches were sampled and analyzed for gold only, with no significant results. The area was identified in 2015 through grid-based soil geochemistry and further expanded in 2016. The 2015 soil sampling identified two large lobes containing elevated copper and molybdenum and in soils (30 to 437 parts per million molybdenum, 200 to 1,080 parts per million copper) approximately 1500 metres northeast of the Central Zone. Examination in 2016 showed the soil anomaly outlines two ridges of outcrop and associated talus aprons producing the two lobes of the anomaly with a lobe of barren recent Miocene basaltic debris between the two ridges. The two ridges are underlain by fine grained Triassic volcanic and sedimentary rocks with strong quartz-sericite-pyrite alteration in the south, grading to strong biotite hornfels to the north. There is no indication of copper and molybdenum mineralization on the two ridges. Most 2016 rock samples from the two ridges yielded less than 0.03 per cent copper with only two samples returning greater than 0.1 per cent copper and most samples assayed less than 10 parts per million molybdenum with only three samples greater than 30 parts per million molybdenum (Assessment Report 36675).

Additional soil sampling and prospecting of creek drainages to the west has extended the soil geochemical anomaly 250 metres west with soil results from 125 to 233 parts per million molybdenum and greater than 500 to 1830 parts per million copper. Prospecting samples in this area yielded up to 0.005 per cent molybdenum and up to 0.8 per cent copper (Assessment Report 36675). The limited prospecting samples within this area suggest a slightly greater overall copper and molybdenum enrichment than samples collected from within the original soil anomaly further to the east.

One sample assayed 4.04 grams per tonne gold over a 3-metre chip sample of quartz-sericite-pyrite material; another sample graded 4.56 grams per tonne gold, 0.088 per cent copper, 9.1 grams per tonne silver and 0.0047 per cent molybdenum over 0.6 metre of quartz and pyrite veining in silicified biotite hornfels volcanoclastic (Assessment Report 36675). Most Far West samples yielded negligible gold values.

The soil and rock geochemistry of Far West is unique on the property in that it is dominated by copper and molybdenum, with little to no gold. The very high copper and molybdenum-in-soil values have not been fully explained.

Refer to the Spectrum occurrence (104G 122) for details a common work history and further Spectrum property geological information.

Bibliography
EMPR EXPL 1981-208
EMPR PF (Northcal Resources - Statement of Exploration)
GSC MAP 9-1957; 11-1971; 1418A
GSC P 71-44
Giroux, G.H and Stacey, J.R., (2016): Technical Report on the Spectrum Gold-Copper Property for Skeena Resources Limited, May 31, 2016
Godden, S.J., Mehner, D.T., Thomas, D.G., Britton, S.A., Martin, C.J., Brodie, J. (2017): Technical Report on the 2017 Mineral Resource Updates and Preliminary Economic Assessment, Spectrum-GJ Copper-Gold Project, for Skeena Resources Limited, May 24, 2017.

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