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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  31-Mar-2022 by Karl A. Flower (KAF)

Summary Help Help

NMI 092O3 Au2
Name MOHAWK, MOTHERLODE, TASEKO, GRANITE CREEK Mining Division Clinton, Lillooet
BCGS Map 092O004
Status Prospect NTS Map 092O03W
Latitude 051º 05' 41'' UTM 10 (NAD 83)
Longitude 123º 23' 18'' Northing 5660430
Easting 472806
Commodities Copper, Gold, Silver, Molybdenum, Zinc, Lead, Uranium Deposit Types L04 : Porphyry Cu +/- Mo +/- Au
Tectonic Belt Coast Crystalline Terrane Cadwallader, Plutonic Rocks
Capsule Geology

The Mohawk porphyry copper prospect, approximately 2 kilometres southeast of the junction of Granite Creek and Taseko River, is within Late Cretaceous biotite granodiorite of the Coast Plutonic Complex, 1.5 kilometres south of its contact with a belt of Upper Cretaceous volcanic rocks.

The Mohawk zone is a northeast-striking, steeply southeast-dipping breccia zone within variable equigranular to porphyritic biotite granodiorite to quartz monzonite. The breccia zone is approximately 25 metres at its maximum width. It narrows to the northeast and also narrows with depth; its extent to the southwest is unknown due to lack of exposure. The host breccia is composed almost entirely of hematite-speckled, finely crystalline leucocratic aplite, an alteration product of the granodiorite. The breccia matrix is veined and filled with quartz, flaky sericite and sulphides. Chalcopyrite is the dominant sulphide mineral and is accompanied by significant gold and lesser silver. Accessory minerals include pyrite, molybdenite, galena, sphalerite, tourmaline, rutile, calcite-fluorapatite and powellite.

In 1927, a sample taken from an open cut assayed 22.29 grams per tonne silver, 10.63 grams per tonne gold and 4.56 per cent copper over 2.4 metres. A sample taken in 1982 assayed 0.85 per cent copper, 0.013 per cent molybdenum, 2.6 grams per tonne gold and 6.17 grams per tonne silver over 2.4 metres (Assessment Report 11073). A radioactive sample assayed 0.016 per cent equivalent uranium oxide (Geological Survey of Canada Economic Geology Report 16).

Work History

Taseko Motherlode Inc. explored the breccia body through underground workings between 1928 and 1935.

In 2007, the Mohawk tenure was acquired by Granite Creek Gold Ltd. Though no direct work has been recorded on the Mohawk showing since 1935, the Taseko region has been explored intermittently by a number of operators since then. Programs carried out include geological mapping, soil sampling, geophysics and drilling, leading to improved knowledge of the area. Granite Creek Gold hopes to explore a connection between the Mohawk and Rowbottom showing through soil sampling.

During 2014 through 2019, Amarc Resources Ltd. completed programs of geological mapping, geochemical (talus fines, rock chip and stream sediment) sampling, 163.6 line-kilometres of induced polarization surveys, 1069 line-kilometres of airborne magnetic surveys and 18 157 metres of diamond drilling on the area as part of the IKE project. The majority of the drilling (15 455.34 metres in 26 holes) was completed on the IKE (MINFILE 092O 025) occurrence.

EMPR AR 1926-191; *1927-204-207; 1928-213; 1930-198; 1934-A30,F25; *1935-F22-24; 1956-35; 1968-155
EMPR GEM 1969-181; 1970-213; 1975-119
EMPR FIELDWORK *1976, p. 50; 1986, pp. 157-169; 1988, pp. 153-158
EMPR PF (Report by E.E. Mason, 1935)
EMPR EXPL 1982-243
EMPR GEOL *1976, pp. 67-84
EMPR MAP 22; 44
EMPR OF 1987-3
GSC SUM RPT 1924A, p. 74; *1928A, pp. 90,91
GSC MAP 29-1963
GSC EC GEOL #16, p. 44; #16 (Rev.), p. 236
GSC OF 534; 551; 2207
EMR MP CORPFILE (Genoveva Resource Inc.)
GCNL #183(Sept.22), 1992
Placer Dome File
Westphal, M.W. (2011-03-10): Technical Report – Taseko Mineral Property
Rebagliati, C.M., Titley, E. (2020-05-29): Technical Report Summarizing Exploration Work on the IKE Cu-Mo-Au-Ag Project, British Columbia, Canada