Geochemical rock sampling for gold in the Munro Township area, Ontario: an orientation survey

Abstract A multielement (Au, Cu, Pb, Zn, Ni, Cr, Ag, As, Hg, Co, and S) geochemical rock sampling survey was carried out in 1977 in the Munro Township area of Ontario to assess the application of rock geochemistry for gold exploration in the region. Detailed sampling with analysis for gold and arsenic was done in 1986 in the immediate vicinity of the Croesus Mine.
Samples of quartz veins and rock formations were taken in regional traverses and in more detail near old showings, prospect pits, and trenches. Quartz, graywacke, carbonate rock, and rhyolite contain the highest concentrations of gold for samples taken away from the old workings. Ultramaflc rocks and gab-bro have uniformly low gold. Basalt samples have slightly higher geometric means, but individual samples contain high gold concentrations. Multielement highs are mostly in mineralized quartz samples. Gold distribution is independent of other elements in most other rock types.
Samples near old showings possess elevated concentrations of gold indicating that prospecting for individual mineral deposits by bedrock sampling is feasible. Concentrations of gold greater than 100 ppb are mostly within 30 m of old workings. Those samples which contain greater than 1000ppb Au were obtained from quartz veins, basalt, graywacke, and rhyolite.
High concentrations of gold were not notably concentrated near the Contact Fault although some anomalous samples came from near and on both sides of the fault. Arsenic concentrations are elevated near the Contact Fault.
Detailed sampling near the Croesus Mine suggests that gold was introduced with faulting, alteration and quartz veining. Gold and arsenic have been added to the wall rock in the vicinity of the main veins.

 
Keywords: Geochemistry, Gold, Exploration, Geology.
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Publication: CIM Bulletin
Author(s): MacKenzie Dickson
Keywords: Gold recovery, Dewatering, Screening, Carbon dewatering.
Issue: 926
Volume: 82
Year: 1989
Text
Summary: Prior or simultaneous addition of ammonium sulphate can, not only enhance the activating effect of hydrosulphide ions on xanthate flotation of malachite but it can also eliminate possible detrimental or depressing effects of excess residual hydrosulphide. Use of relatively inexpensive ammonium sulphate appears to reduce the consumption of the much more expensive sulphidizing agent for optimal flotation recovery.
Publication: CIM Bulletin
Author(s): Wenbin Zhang
Keywords: Mineral processing, Xanthate flotation, Malachite, Sulphidized xanthate flotation, Flotation processes, Ore recovery.
Issue: 926
Volume: 82
Year: 1989
Text
Summary: The mineralogical studies done on Hope Brook ore samples indicated that a heap leach gold recovery process may be possible. In the metallurgical program that followed, column tests confirmed this interpretation. A 9300 tonne demonstration heap leach test, in the late fall of 1985, reaffirmed laboratory results while identifying operating conditions that will have to be addressed in a production heap leach plan. Operating plans, gold recoveries and cost areas will be presented.
Another...
Publication: CIM Bulletin
Author(s): G.W. McDonald
Keywords: Metallurgy, Mineral processing, Gold recovery, Mineral extraction.
Issue: 926
Volume: 82
Year: 1989
Text
Summary: Once all the hullabaloo about Finance Minister Wilson's April 27 budget died down (or was it an April 26 budget?), the pain of the budget papers began to sink in. Individuals and corporations will have to dig deeper and pay more taxes — and government will continue to dig deeper and spend more. The irony of the situation is that higher tax rates actually make flow-through shares more attractive as a tax-deferral investment — a bittersweet "bravo" for the mining industry.
Publication: CIM Bulletin
Author(s): Robert B. Parsons
Issue: 926
Volume: 82
Year: 1989
Text
Summary: Stillwater Mining Company (SMC), a partnership of Chevron Resources and Manville Corporation, produces a copper-nickel, platinum-palladium flotation concentrate at its Nye, Montana mine. The concentrate is then toll processed in Europe. Recognizing the economic advantage of treating the concentrates at the mine site and of retaining this strategic resource in the United States, the Company commissioned Tolltreck International Limited and International Process Research Corporation to conduct...
Publication: CIM Bulletin
Author(s): J. W. Matousek, P.J. Marcantonio, R.J. Phillips, J.G. Whellock
Keywords: Pyrometallurgy, Ore Recovery, Smelting tests, Pilot plant smelting.
Issue: 926
Volume: 82
Year: 1989
Text
Summary: The mine operator has two prime objectives when he operates a mine: (1) the mine must be safe, and (2) the mine must operate with the lowest possible costs. The operator constantly faces a dilemma; if he is over cautious with regard to safety, his costs may be very high, and if he is over-zealous in trying to reduce costs, the safety of his operation may be jeopardized.
Modern bulk mining methods rely heavily on high productivity non-entry sloping techniques (e.g. open sloping, VCR, etc.)....
Publication: CIM Bulletin
Author(s): J. W. Bawden, J. Nantel, D. Sprott
Keywords: Rock mechanics, Cost effective mining, Empirical design techniques, Underground mining Mine design, Support systems, Safety.
Issue: 926
Volume: 82
Year: 1989
Text
Summary: The mine operator has two prime objectives when he operates a mine: (1) the mine must be safe, and (2) the mine must operate with the lowest possible costs. The operator constantly faces a dilemma; if he is over cautious with regard to safety, his costs may be very high, and if he is over-zealous in trying to reduce costs, the safety of his operation may be jeopardized.
Modern bulk mining methods rely heavily on high productivity non-entry sloping techniques (e.g. open sloping, VCR, etc.)....
Publication: CIM Bulletin
Author(s): J. W. Bawden, J. Nantel, D. Sprott
Keywords: Rock mechanics, Cost effective mining, Empirical design techniques, Underground mining Mine design, Support systems, Safety.
Issue: 926
Volume: 82
Year: 1989
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