Ore Microscopy Applied to the Beneficiation of Volcanogenic Massive Sulfides

The presence of fine-grained mineral intergrowths, the complex distribution of deleterious minor elements, and the variable base-metal contents in some assemblages commonly pose technical problems for the processing of volcanogenic massive sulfide ores. The beneficiation of most massive sulfide ores from the Iberian Pyrite Belt requires extremely fine grinding to liberation sizes of K80 = 15 µm to 25 µm. For several deposits, mapping of the ore types and metal zoning patterns has shown that the different ore types are distributed as ore lenses within the massive sulfides. Mineralogical, textural, and metallogenetic studies have provided an understanding of the distribution of both the vertical and the horizontal metal zonation in the orebodies. Because the efficiency of ore processing is affected by ore textures, and because the same mineral commonly has different textures and varies in chemical composition, a relationship between textures of the feed and the middlings must be established for all ore types defined at the deposit scale. Quantitative mineralogical methods have been developed to provide, on a timely basis, the information needed to optimize the concentration processes for the massive sulfide ores at the Aljustrel and Neves-Corvo deposits, Iberian Pyrite Belt, Portugal.
Keywords: Mineral intergrowth, base metal, Volcanogenic massive sulfide ores, Iberian Pyrite Belt
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Summary: The Geological Society has its own quarterly journal called Exploration
and Mining Geology, for the publication of Canadian and international papers on
applied aspects of mineral exploration and exploitation, including mineral
deposit geology, geochemistry, and geophysics, mining geology, mineral resource
appraisal and estimation methods, environmental geology, and case histories. The
editor of the journal is Jeremy P. Richards
Publication: Exploration & Mining Geology
Issue: 4
Volume: 6
Year: 1997
Web Page
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<BODY>The Canadian Shield and its extensions are traversed by an orthogonal
system of northwest and northeast trending arch-style uplifts. These basement
arches were formed by repeated vertical movements along pre-existing structures
during compressional and extensional tectonism...
Publication: Exploration & Mining Geology
Author(s): K.D. CARD: Card and Associates’ Geosearch, 86 Penfield Drive, Kanata, Ontario, Canada, K2K 1M1; B.V. SANFORD: 17 Meadowglade Drive, Nepean, Ontario, Canada, K2G 5J4; G.M. CARD: Card and Associates’ Geosearch, 86 Penfield Drive, Kanata, Ontario, Canada, K2K 1M1
Keywords: Canadian Shield, Uplifts, Basement arches, Techtonism, Magnetism
Issue: 4
Volume: 6
Year: 1997
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Summary: Eclogite is an important source of diamond in the upper mantle, but is more localized than peridotite. Using eclogitic minerals in kimberlite and diamond exploration is also more problematic than using the well-known peridotite-derived indicator minerals Cr-pyrope and magnesiochromite. The problems include color similarities between orange garnets from eclogites, Cr-poor megacrysts, and crustal garnets, chemical similarities with Cr-poor megacryst suite garnets (specifically elevated Na2O...
Publication: Exploration & Mining Geology
Author(s): DANIEL J. SCHULZE: Department of Geology, University of Toronto, Erindale College
Mississauga, Ontario, Canada L5L 1C6
Keywords: Eclogite, Diamond, Kimberlite exploration, Diamond exploration
Issue: 4
Volume: 6
Year: 1997
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Summary: The acid rock drainage (ARD) buffering capacity of mine waste is governed by its bulk chemical composition and its mineral assemblage. Conventional acid base accounting (ABA) tests can be used to predict short-term buffering, but should be used with caution to model or predict the long-term ARD buffering capacity of mine waste. ABA data for mine waste samples from four different deposit types: anorthosite-hosted magmatic sulfide nickel, dunite-hosted magmatic sulfide nickel, porphyry...
Publication: Exploration & Mining Geology
Author(s): BRUCE W. DOWNING: Gamah International Limited, Vancouver, British Columbia, Canada; HANS E. MADEISKY: HEMAC Exploration Ltd., Vancouver, British Columbia, Canada
Keywords: Acid rock drainage, ARD, Mine waste, Acid base accounting, ABA
Issue: 4
Volume: 6
Year: 1997
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Summary: <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<BODY>The Red Chris Cu-Au deposit (522.7 Mt at 0.35% Cu and 0.27 g/t Au),
northwestern British Columbia, is one of several pre-accretionary porphyry
systems in the Cordillera of western Canada. It is hosted by an Early Jurassic
hornblende monzonite to quartz monzodiorite porphyry which...
Publication: Exploration & Mining Geology
Author(s): T. BAKER: Mineral Deposit Research Unit, Department of Earth and Ocean Sciences
The University of British Columbia, Vancouver, British Columbia, Canada, V6T 1Z4
C.H. ASH: Geological Survey Branch, Ministry of Employment and Investment, Victoria, British Columbia, Canada, V8W 9N3; J.F.H. THOMPSON: Mineral Deposit Research Unit, Department of Earth and Ocean Sciences, The University of British Columbia, Vancouver, British Columbia, Canada, V6R 1Z4
Keywords: Red Chris deposit, Cu-Au deposit, Porphyry, Carbonate
Issue: 4
Volume: 6
Year: 1997
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<BODY>Narrow veins are an important world-wide source of silver, tin, uranium
and particularly gold. To potential financiers, this style of mineralization is
viewed as high risk because of the often relatively small resource involved and
high cost of estimation. In many cases diamond...
Publication: Exploration & Mining Geology
Author(s): SIMON C. DOMINY: Mining Geology Group, School of Earth and Environmental Sciences, University of Greenwich, Chatham Maritime, Kent ME4 4TB, U.K., and
Welsh Gold Plc, Northwood, Middlesex HA6 3LY, U.K.; ALWYN E. ANNELS: Mining Geology Group, School of Earth and Environmental Sciences, University of Greenwich, Chatham Maritime, Kent ME4 4TB, U.K.; Steffen, Robertson & Kirsten (UK) Ltd, Cardiff CF1 3BX, Wales, U.K.; G. SIMON CAMM, PAUL WHEELER: Department of Geology, Camborne School of Mines, Unive
Keywords: Geology, Narrow veins, Silver, Tin, Uranium, Gold, Mineralization, Geological study
Issue: 4
Volume: 6
Year: 1997
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