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Exploration and Mining Geology; July-October 2008; v. 17; no. 3-4; p. 163-196; DOI: 10.2113/gsemg.17.3-4.163
© 2008 Canadian Institute of Mining, Metallurgy & Petroleum
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The Schaft Creek Porphyry Cu-Mo-(Au) Deposit, Northwestern British Columbia*

J.E. Scott1, J.P. Richards1,{dagger}, L.M. Heaman1, R.A. Creaser1 and G.S. Salazar2

1 Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta, T6G 2E3.
2 CopperFox Metals Inc., 650, 340–12th Avenue S.W., Calgary, Alberta, T2R 1L5.

Correspondence: {dagger} Corresponding Author: E-mail: jeremy.richards{at}ualberta.ca

Schaft Creek is a calc-alkaline porphyry Cu-Mo-(Au) deposit located in northwestern British Columbia. The deposit formed in a volcanic arc setting, likely on a back-arc rifted continental fragment. It is hosted by Late Triassic basaltic to andesitic volcanic rocks of the Stuhini Group (Stikine Terrane), and is associated with porphyritic granodiorite dikes emanating from the nearby Hickman batholith. The age of the Hickman batholith is approximately constrained here by a composite U–Pb zircon date of 222.1 ± 9.6 Ma, which is in broad agreement with a well-constrained age for mineralization at Schaft Creek of 222.0 ± 0.8 Ma (Re–Os molybdenite). The deposit is in most respects typical of calc-alkaline porphyry systems, but displays silica-poor sericite-chlorite alteration in mafic country rocks in place of classic phyllic alteration. The deposit comprises three distinct, but related, zones: the northern Paramount zone, the Main zone, and the West Breccia zone. Two phases of mineralization are observed. The first phase occurs as hydrothermal veins and breccias, and minor disseminations. It consists of bornite, chalcopyrite, molybdenite, and pyrite with potassic and sericite-chlorite alteration. The second phase is minor and consists of veins of molybdenite ± specularite, as well as Cu–Pb-Zn sulfide veins without any significant corresponding alteration. Extensive structural modification has affected the deposit both during and after its formation.

Key Words: Porphyry Cu-Mo-(Au) • British Columbias • Stikine Terrane • Late Triassic






JOURNAL HOME HELP CONTACT PUBLISHER SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS
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