GeoFile 2009-4: Carbonate-Hosted Nonsulphide Zn-Pb Deposits, Salmo District, British Columbia, Canada (Roundup Poster)
View GeoFile 2009-4 (PDF, 2.7 MB)
Under favourable geological, climatic, topographic and hydrological conditions, the weathering of sulphide deposits may result in the formation of economically significant carbonate-hosted, nonsulphide, base-metal (CHNSBM) deposits. CHNSBM deposits were the main source of zinc prior to the 1930s. Following the development of differential flotation and breakthroughs in smelting technology, the mining industry turned its attention to sulphide ore (Hitzman et al., 2003). The situation is changing as evidenced by the successful operation of a dedicated processing plant, extracting Zn through direct acid leaching, solid-liquid separation, solvent extraction and electrowinning, from nonsulphide and mixed ores from the Skorpion mine in Namibia.
The Salmo district (NTS 082F/03) of British Columbia is renown for its Irish and MVT massive sulphide deposits (Paradis, 2007). It also contains associated direct-replacement CHNSBM deposits and has a potential to host undiscovered Zn-rich wallrock replacement-type CHNSBM deposits.
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