Recovery of gold from old tailing ponds

Abstract In the last few years CANMET has taken the initiative by investigating the possibility of reactivating abandoned old tailings dumps (for gold production) which would be of potential economic interest across Canada.
Nova Scotia was one location where numerous gold processing plants were in operation in the early days. A survey of the old tailing dumps was conducted and some areas of interest were selected. Among them were the sites identified as Lake Charlotte and Forest Hill.
Ore samples collected from those tailing ponds were examined for their chemico-mineralogical composition and investigated for gold extraction. Three technological concepts were tested: flotation, direct cyanidation and flotation followed by cyanidation of the flotation concentrate. The combined flota-tion-cyanidation variant, yielding a gold recovery in the range of 90%, was recommended for processing the tailing ore.
Pilot-plant runs carried out by a commercial testing firm (data not included in this paper) confirmed the conditions and results of CANMET's technology. As a result a consulting-engineering firm designed the processing plant which is expected to begin operation in the near future.
Keywords: Mineral processing, Tailing dumps, Gold recovery, Flotation, Cyanidation, Milling.
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Publication: CIM Bulletin
Author(s): G. VAN WEERT, K.J. FAIR, J.C. SCHNEIDER
Issue: 895
Volume: 79
Year: 1986
Text
Summary: A joint federal/provincial/industry subcommittee of the Intergovernmental Working Group on the Mineral Industry (IGWG) has published an informative and readable report on taxation matters concerning Canada's mining industry. The report, which was presented to the federal and provincial mines ministers in September 1986, identifies and discusses key tax issues relating to this industry. The report is mandatory reading for anybody with an interest in mineral exploration or production in Canada.
Publication: CIM Bulletin
Author(s): ROBERT B. PARSONS
Issue: 895
Volume: 79
Year: 1986
Text
Summary: This paper describes major technical developments in rod mill design and operating practice since its introduction into the North American minerals industry over fifty years ago. The basic operating characteristics of the wet, overflow rod mill are described, and significant operating variables are reviewed in terms of their effects on mill power draw, power efficiency, and practical aspects of circuit operation. Key factors for improving the economic performance of rod milling circuits are...
Publication: CIM Bulletin
Author(s): R.E. MclVOR, J.A. FINCH
Keywords: Mineral processing, Milling, Rod mill design, Rod mills, Power efficiency, Circuit operation, Grinding.
Issue: 895
Volume: 79
Year: 1986
Text
Summary: The tailings disposal system at Les Mines Selbaie includes dewatering of tailings in a high-capacity thickener, followed by point discharge of the thickened solids to form a stable conical pile. Tailings water drains to ponds formed behind engineered dams, prior to either recycling for process use or discharge to the environment. Design and economic considerations of the system are discussed. Construction, start-up and operating experiences are also presented.
Publication: CIM Bulletin
Author(s): K.R. WOOD, G.W. MCDONALD
Keywords: Mineral processing, Tailings disposal, Disposal system, Les Mines Selbaie, Environmental control, Tailings pond.
Issue: 895
Volume: 79
Year: 1986
Text
Summary: Sedimentary phosphate ores make up approximately 87% of the world's known reserves and are generally more difficult to beneficiate than igneous ores. In almost all cases, desliming prior to flotation represents the major source of losses. Laboratory studies of selective desliming of sedimentary ores are presented. Some fundamental studies with pure mineral systems are also discussed. Selective desliming, especially using selective flocculation, gave the best performance. Possible industrial...
Publication: CIM Bulletin
Author(s): A. CORREA de ARAUJO, G.W. POLING, E.M. COELHO
Keywords: Mineral processing, Desliming, Phosphate ores, Sedimentary ores, Flocculation, Flotation, Beneficiation.
Issue: 895
Volume: 79
Year: 1986
Text
Summary: This literature survey discusses the recovery of gold from thiourea solutions. An overview of techniques used and general comments on the basic cyanidation methods are presented. The chemistry and mechanisms of cementation, activated carbon, resins, electrowinning, solvent extraction and pressure reduction are examined. Conclusions and recommendations give orientation for future research and development activities in this field.
Publication: CIM Bulletin
Author(s): G. DESCHENES
Keywords: Gold recovery, Gold processing, Cementation, Thiourea solutions, Cyanidation, Ion exchange, Electrowinning, Leaching, Activated carbon adsorption.
Issue: 895
Volume: 79
Year: 1986
Text
Summary: Gravity concentrators are evaluated either in closed or open circuit. The process developed by MIRL employs the use of neutron activated gold (>9SAu) and radiation detection circuits which monitor the concentrator's product pulp streams. Concentrator recovery is determined from the ratio of the number of gold particles detected as passing into the concentrate to the total number of gold particles detected over all monitored pulp streams. This system eliminates the experimental errors...
Publication: CIM Bulletin
Author(s): DANIEL E. WALSH, P.O. RAO
Keywords: Mineral processing, Gold recovery, Gravity concentration, Radiotracer, Concentrator recovery, Radiation, Neutron capture reaction.
Issue: 895
Volume: 79
Year: 1986
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