Gold mineralization associated with archean stratabound sulphides in the Cheminis deposit near Larder Lake, Ontario

Abstract The Cheminis gold mineralization zone is approximately 6.5 km west of the Ken Addison Mine along the Larder Lake Shear Zone, in the southern part of the Abitibi Greenstone Belt. The zone is very similar in appearance to the flow ore at the Kerr Addison Mine and occurs at the same stratigraphic position. Drilling has demonstrated that the gold mineralization at Cheminis persists to a depth of over 3000 ft.
The mineralization is hosted by a pyritic, tuffaceous sediment which occurs within a sequence of volcanics and sediments which have been pervasively carbonatized. The gold is largely enclosed within pyrite grains and the amount of gold in the layers of pyrite increases in the layers closest to a graphitic fault zone.
It is suggested that the gold mineralization may be primarily related to the syngenetic sulphide concentrations formed during fumarolic activity on the seafloor along the Larder Lake Shear Zone. At a later stage a hydrothermal event associated with alkalic volcanism may have resulted in regional carbonatization and further concentration of the gold in the vicinity of fault zones.
Keywords: Mineralization, Gold deposits, Cheminis deposit, Larder Lake, Sulphides.
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Publication: CIM Bulletin
Author(s): CHARLES KNOWLES, GARY FLETCHER
Keywords: Human resources, Mining industry, Employment.
Issue: 902
Volume: 80
Year: 1987
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Publication: CIM Bulletin
Author(s): C.J. ALLEN, R.J. MILLS
Keywords: Materials engineering, Galvanization, Plant trials, Nickel-zinc process, Nickel-zinc bath.
Issue: 902
Volume: 80
Year: 1987
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Summary: Additions of peat moss and small quantities ofNaOH during balling of low silica specular hematite concentrates have eliminated the need to use bentonite as a binder. The redu-cibility and swelling of such pellets have been evaluated using four different gas mixtures, consisting ofH2 - CO - N2. The influence of the reducing power of the gases, on the swelling behaviour of pellets has been documented. Under the different reducing conditions, this new type of pellets exhibit properties similar...
Publication: CIM Bulletin
Author(s): E. GODIN M. RIGAUD, S.C. PANIGRAHY
Keywords: Boulelles oxydes de fer, Agglomeration, Additifs, Bentonite, Tourbe, Gonflement, Cinetique de reduction, Reductibilité, Hematite.
Issue: 902
Volume: 80
Year: 1987
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Summary: Poor Pb-Zn selectivity during Pb flotation in laboratory tests on a Mississippi Valley-type Pb-Zn ore was traced to apH effect. In the pH range, 9.5 to 11.0 sphalerite floated readily without copper activation. Compared to sphalerite flotation with copper activation this procedure gave equivalent selectivity but reduced flotation rate.
Possible mechanisms of this sphalerite flotation without copper activation are discussed. Activation by Fe(OH)2 is suggested, the Fe++ ions being derived from...
Publication: CIM Bulletin
Author(s): M. LEROUX, S.R. RAO, J.A. FINCH
Keywords: Mineral processing, Flotation, Sphalerite, Lead-zinc ore, Galena, Copper activation.
Issue: 902
Volume: 80
Year: 1987
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Summary: The Bureau of Mines has developed a particle agglomeration technique to improve the flow of leaching solution through heaps of low-grade gold-silver ores which contain clays. Bench-scale experiments and industrial practice have shown that the percolation rate of cyanide leaching solution is greatly enhanced by mixing the ore with Portland cement as a binder, moistening the mixture, mechanically tumbling to form agglomerates, and aging before heap building and leaching. A slight modification...
Publication: CIM Bulletin
Author(s): J.A. EISELE, D.L POOL
Keywords: Metallurgy, Agglomeration, Heap leaching, Cyanide leaching solution, Tailings, Precious metals, Gold, Silver.
Issue: 902
Volume: 80
Year: 1987
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