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GEOREF RECORD

The Tiger Deposit; a carbonate-hosted, magmatic-hydrothermal gold deposit, central Yukon, Canada

Eric J. Thiessen, Sarah A. Gleeson, Venessa Bennett and Robert A. Creaser
The Tiger Deposit; a carbonate-hosted, magmatic-hydrothermal gold deposit, central Yukon, Canada
Economic Geology and the Bulletin of the Society of Economic Geologists (April 2016) 111 (2): 421-446

Abstract

The Tiger gold deposit, located in central Yukon, Canada, has an inferred resource of 8.28 Mt containing 289,400 ounces gold at an average grade of 1.09 g/t and an indicated resource of 7.15 Mt containing 509,000 ounces gold at an average grade of 2.21 g/t. A detailed paragenetic and geochemical study of the carbonate-hosted replacement-style deposit provides constraints on the fluid history and genesis of the gold mineralizing system. The deposit is hosted in Silurian-Devonian unmetamorphosed carbonate rocks of the Mackenzie Platform and occurs 7 km northeast of the Dawson thrust, which broadly marks the northeast boundary of the Selwyn Basin. A nearby Paleocene intrusion, the Rackla Pluton, subcrops approximately 3 km from the Tiger Deposit. No other deposits of this kind have been described within the Mackenzie Platform. The Tiger Deposit consists of strata-bound replacement-style mineralization adjacent to an interpreted local feeder fault. Mineralization occurs in two distinct assemblages: (1) hydrothermal dolomite, gold-bearing arsenopyrite, and minor pyrite and (2) fractures hosting native gold associated with bismuth, antimony, silver, tungsten, and minor base metals. Carbon, oxygen, and strontium isotope values suggest magmatic water, originating from the Rackla Pluton, as the source of mineralizing fluids for the Tiger Deposit. Microthermometric data from gold-bearing dolomites, quartz, and sphalerite document the presence of hot, approximately 350 degrees C aqueous-carbonic fluids for the duration of gold mineralization, overprinted by cooler, approximately 150 degrees C aqueous meteoric fluids late in the paragenesis during the waning of the mineralizing system. The Tiger Deposit is thus interpreted to represent a distal expression of Paleocene magmatic activity hosted in carbonates northeast of the Selwyn Basin, central Yukon.


ISSN: 0361-0128
EISSN: 1554-0774
Coden: ECGLAL
Serial Title: Economic Geology and the Bulletin of the Society of Economic Geologists
Serial Volume: 111
Serial Issue: 2
Title: The Tiger Deposit; a carbonate-hosted, magmatic-hydrothermal gold deposit, central Yukon, Canada
Affiliation: University of Alberta, Department of Earth and Atmospheric Sciences, Edmonton, AB, Canada
Pages: 421-446
Published: 201604
Text Language: English
Publisher: Economic Geology Publishing Company, Lancaster, PA, United States
References: 64
Accession Number: 2016-036157
Categories: Economic geology, geology of ore deposits
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 5 tables, sects., sketch maps
N63°45'00" - N64°15'00", W117°00'00" - W114°00'00"
Secondary Affiliation: Geomantia Consulting, CAN, Canada
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Society of Economic Geologists. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201618
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