Process mineralogy of select refractory Carlin-type gold ores

Abstract Refractoriness in Carlin-type gold ores results mostly from fine locking of gold in pyrite, locking in various gangue phases, notably quartz, and a "preg robbing" condition attributed to organic carbon. All three conditions may occur in any given deposit, including Newmont's Carlin and Gold Quarry deposits in Nevada, where types of refractoriness occur locally in minor amounts.
Measurements of specific gravity, water absorption and screen size distributions of gold in alteration rock types from Gold Quarry show transitional changes from siliceous cherts through decreasingly silicified and increasingly argillized siltstones.
Low permeability of siliceous ores contributes to "size dependent" refractoriness in cyanidation test work. Colligative physical and chemical measurements demonstrate that silicified cherty ores are difficult to grind, poorly permeable, and less amenable to cyanidation. Refractoriness in pad or column leaching of coarsely crushed siliceous siltstones and cherts is shown to correlate with interrelated measurable mineralogic and physical parameters.
Keywords: Mineralogy, Process mineralogy, Refractory ores, Gold mineralization, Gold, Water absorption, Specific gravity, Screen-size distribution, Metallurgy.
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Summary: The methods generally applied to predict performance and financially evaluate beneficiation options are reviewed.
Typical costs for a western Canadian thermal coal operation are examined. Preparation—from truck dump to loadout— frequently amounts to over a quarter of total minesite costs. Failure to achieve projected yield—whether caused by mine or plant problems—substantially increases production costs because more coal has to be mined to meet a specific market...
Publication: CIM Bulletin
Author(s): STANLEY G. BUTCHER
Keywords: Coal preparation, Economics, Thermal coal, Washability data, Coal cleaning, Coal beneficiation, Plant performance.
Issue: 881
Volume: 78
Year: 1985
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Summary: The Coal Research Laboratory (CRL) of CANMET along with other research organizations in coal-producing countries envisage major benefits from computer applications in coal preparation. Some of these benefits are greater system flexibility, improved coal preparation plant performance efficiency and efficient utilization of manpower, all of which result in economic benefits. Computers can be applied for both on-line and off-line purposes; this paper focuses on the on-line applications from the...
Publication: CIM Bulletin
Author(s): A.I.A. SALAMA, M.W. MIKHAIL, R.J. MIKULA
Keywords: Coal preparation, Computer applications, Process control, Instrumentation, Automation, Coal flotation, Ash monitoring.
Issue: 881
Volume: 78
Year: 1985
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Summary: A very conductive zone was revealed in 1977 and 1978 by magnetotelluric (MT) measurements carried out near Ste-Mathilde, 6 km northeast of La Malbaie. In order to identify the structure causing the anomaly, thirty-five MT soundings were recorded in 1980 and 1981 on and around the conductor within a radius of 4 km. Results confirmed that the conductor is of limited extent (less than 2 km by 0.4 km). The proposed model is a highly conductive vertical slab, the top of which is within 200 m from...
Publication: CIM Bulletin
Author(s): MICHEL CHOUTEAU
Keywords: Mineral exploration, Technology, Magnetotelluric measurement, Electrical resistivity, Conductivity, Metallic mineralization, Electrolytic solution, Graphite veins.
Issue: 881
Volume: 78
Year: 1985
Text
Summary: A rank-map of Crowsnest coalfield, showing the distribution of the bituminous coal measures and the locations of major structures, has been produced from vitrinite reflectance measurements on over 600 coal samples. The timing of coalification in relation to these major structures has also been determined.
In the west-central portion of the coalfield a complete stratigraphic succession of coal measures which rides on major thrust surfaces is all of high-volatile bituminous rank, but despite...
Publication: CIM Bulletin
Author(s): DAVID E. PEARSON, DAVID A. GRIEVE
Keywords: Coal preparation, Coalification, Rank gradients, Stratigraphy, Coal quality, Structural setting, Crowsnest coalfield.
Issue: 881
Volume: 78
Year: 1985
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Summary: The paper describes current 'tools' available to the coal preparation engineer for carrying out the evaluation of data, process design, selection of equipment and layout and design of coal preparation plants.Laboratory and pilot-scale equipment is widely available and test data can be used to provide valuable design information regarding capacities and sizing for specific applications. Pilot plants, unless they fit closely to the basic design envisaged for the eventual commercial plant, can...
Publication: CIM Bulletin
Author(s): D.G. OSBORNE
Keywords: Coal preparation, Process Design, Computer Modelling, Plant design, Coal cleaning, Washability data.
Issue: 881
Volume: 78
Year: 1985
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Summary: A program of sampling in Canadian washeries was carried out by the Coal Research Laboratory (CRL) over a period of two years to evaluate the performance of various density separators in these operations "'. Operating data on quality and recovery of products, separation efficiencies and cutpoints for each separator type are compared with data predicted using computer models developed from previously existing data.The Heavy Medium Cyclone (HMC), Heavy Medium Bath (HMB) and jig models give...
Publication: CIM Bulletin
Author(s): A.I.A. SALAMA, M.W. MIKHAIL, LC. BIRD
Keywords: Coal preparation, Density separators, Coal washing, Washeries, Computer models.
Issue: 881
Volume: 78
Year: 1985
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