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File Created: 29-Feb-1988 by Gordon S. Archer (GSA)
Last Edit:  09-Jul-2020 by Karl A. Flower (KAF)

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NMI 104B8 Cu2
Name KERR F, F Mining Division Skeena
BCGS Map 104B049
Status Prospect NTS Map 104B08W
Latitude 056º 27' 34'' UTM 09 (NAD 83)
Longitude 130º 16' 21'' Northing 6257942
Easting 421584
Commodities Gold, Silver, Copper Deposit Types H04 : Epithermal Au-Ag-Cu: high sulphidation
G07 : Subaqueous hot spring Ag-Au
Tectonic Belt Intermontane Terrane Stikine
Capsule Geology

The Sulphurets-Mitchell Creek area is underlain by rocks of the Lower Jurassic Unuk River Formation, Hazelton Group. These include green to grey volcanic epiclastics, and a sequence of dominantly fine- grained marine sediments. A third sequence of massive red and green volcanic sandstones and conglomerates form the highest peaks capping the stratigraphic sections.

The Kerr F mineral occurrence is reported to lie entirely within a "tectonic shear zone". This zone contains all of the significant gold anomalies. This zone covers an elongated northern trending area, 800 to 900 metres wide and 2 kilometres long. The zone is flanked by comparitively unaltered or weakly altered, fine-grained, brownish green clastic sediments and submarine volcanic rocks on the east, and by a thick unit of basaltic andesite on the west. The tectonic zone is typically composed of moderately to strongly altered and sheared rocks, interpreted to be of volcanic, subvolcanic or plutonic origin. Most of the altered zone can be described as a sericite schist, how- ever, andesitic tuffs and flows, and feldspar porphyry dykes, and possibly flows, can be recognized in the less altered zone. A later formed "swarm" of fine-grained, weakly altered andesite dykes cuts across the schistosity. Both the altered zone and dykes have been cut by faults. Minor sections of silty shale and siltstone occur on the western and eastern margin of the altered zone.

The F Zone mineralization is exposed on the south flank of the Kerr Ridge, just above the ice surface of the West Sulphurets Glacier.

Mineralization is reported to occur in quartz veins and is simi- lar to the Kerr C occurrence (104B 188). The host rock is a sericite schist or an andesitic tuff. The alteration assemblage includes sericite, quartz, pyrite and carbonate. A sample taken from here in 1985 assayed 46.5 grams per tonne gold (Assessment Report 14614).

The F Zone was outlined as an area of anomalous gold values during the 1985 reconnaissance geochemical survey. Follow-up detailed soil geochemical survey and rock sampling work in 1986 showed that the gold values were high, but distribution was erratic and discontinuous. Given the steep terrane and access problems in this area, no addi- tional work has been undertaken to date.

EMPR ASS RPT 12471, 13369, 14614, 15493, *16616
EMPR EXPL 1983-522; 1984-386; 1985-A24,A52; 1986-C440; 1987-A15,C376
EMPR FIELDWORK 1987, pp. 199-209
EMPR INF CIRC 1986-1, pp. 14,18; 1988-1, p. 12 (BC Mineral Exploration
Review 1985, 1987)
EMPR OF 1988-4
EMPR PF (Newmont Exploration of Canada Ltd.: Geology Map, 1:31,250
Scale; Sulphurets Gold Corporation: Prospectus, Jul.22, 1987,
Statement of Material Facts (#61/88), Jun.30, 1988; Western
Canadian Mining Corporation: Annual Report 1987, Press Release
Sept.28, 1988)
EMR MP CORPFILE (Western Canadian Mining Corporation)
GSC MAP 9-1957; 1418A
GSC P 89-1E, pp. 145-154
N MINER Nov.9,Dec.14, 1987; Sept.19,Oct.3,10,Nov.28, 1988
V STOCKWATCH Aug.27,Sept.8,11,23,27;Oct,21,23,26;Nov.16, 1987
Kirkham, R.V. (1963): The Geology and Mineral Deposits in the
Vicinity of the Mitchell and Sulphurets Glaciers, M.Sc. Thesis,
University of British Columbia
Simpson, T.M., (1983): The Geology and Hydrothermal Alteration of the
Sulphurets Deposits, Northwest British Columbia, M.Sc. Thesis,
University of Idaho
Lechner, M.J. (2007-04-06): Mitchell Creek Technical Report
Lechner, M.J. (2008-02-29): Kerr-Sulphurets Technical Report
Lechner, M.J. (2008-03-27): Updated Mitchell Creek Technical Report
Grills, F. (2008-12-19): Kerr-Sulphurets-Mitchell Preliminary Economic Assessment 2008
Lechner, M.J. (2009-03-30): Updated KSM Mineral Resources
Grills, F. (2009-09-08): Kerr-Sulphurets-Mitchell (KSM) Preliminary Economic Assessment Addendum 2009
Lechner, M.J. (2010-01-25): January 2010 Updated KSM Mineral Resources
Grills, F. (2010-03-31): Kerr-Sulphurets-Mitchell (KSM) Prefeasibility Study
Lechner, M.J. (2011-03-29): March 2011 Updated KSM Mineral Resources
Ghaffari, H. (2011-06-15): Kerr-Sulphurets-Mitchell (KSM) Prefeasibility Study Update 2011
Huang, J. (2012-06-22): 2012 KSM (Kerr-Sulphurets-Mitchell) Prefeasibility Study
Lechner, M.J. (2014-03-31): NI 43-101 Technical Report on Initial Deep Kerr Resource
Huang, J. (2014-11-11): 2012 KSM (Kerr-Sulphurets-Mitchell) Prefeasibility Study
Ghaffari, H. (2016-10-06): 2016 KSM (Kerr-Sulphurets-Mitchell) Prefeasibility Study Update and Preliminary Economic Assessment