1. Mineral Deposit Research Unit, Department of Earth, Ocean and Atmospheric Sciences, The University of British Columbia, 2020-2207 Main Mall, Vancouver, BC V6T 1Z4, Canada.
2. Geological Survey and Resource Development Branch, BC Ministry of Energy and Mines, P.O. Box 9320, Stn. Prov. Govt., Victoria, BC V8W 9N3, Canada.
3. Pacific Center for Isotopic and Geochemical Research, Department of Earth, Ocean and Atmospheric Sciences, The University of British Columbia, 2020-2207 Main Mall, Vancouver, BC V6T 1Z4, Canada.