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The Extractive Metallurgy of Gold


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Table of Contents

1 Gold Ores.- Geochemistry of Gold and Auriferous Deposits.- Auriferous Deposits.- Effects of Biological Systems on Metallic Gold.- Gold in Sea Water.- Exploration for Gold.- 2 Physical and Chemical Properties of Gold.- Physical Properties of Gold.- Chemical Properties of Gold.- Gold Assaying.- 3 Treatment of Placer Deposits.- Placer Environment and Formation.- Dredging or Hydraulic Mining.- Gold Recovery from Placer Deposits.- Gravity Concentration of Alluvial Gold.- 4 Milling of Amenable Gold Ores.- Comminution of the Ore.- Partial Direct Recovery of Gold.- Leaching of Pulverized Gold Ores.- Gold Milling Flow Sheets.- Recovery of Gold from Solution.- 5 Treatment of Refractory Gold Ores.- Mineralogy of Refractory Gold Ores.- Flotation of Some Refractory Ores.- High-Temperature Oxidation: Roasting.- High-Pressure Oxidation.- Biological Oxidation.- Chemical Oxidation.- Silica-Locked Gold.- 6 Leaching Low-Grade Gold Ores.- Ore Testing.- Heap Leaching and Dump Leaching.- Vat Leaching.- 7 Recovery of Secondary Gold.- Base Metals Present in Gold Scrap.- Special Cases of Gold Scrap.- 8 Cyanidation of Gold Ores.- Theories on Gold Cyanidation.- The Mechanism of Cyanidation.- The Kinetics of Gold Cyanidation.- Cyanide Regeneration.- Destruction of Cyanide.- 9 Alternative Leaching Reagents for Gold.- Thiourea Leaching of Gold.- Thiosulfate Leaching of Gold.- Leaching with Halogens and Halides.- 10 Recovery of Gold from Solutions.- Zinc Cementation.- Activated Carbon Adsorption.- Electrowinning of Gold from Cyanide Solutions.- Electrowinning of Gold from Pregnant Gold-Mill Solutions.- Staged Heap Leaching and Direct Electrowinning.- Industrial Uses of Activated Carbon.- Ion-Exchange Resins.- Solvent Extraction.- Metal Chelating Agents.- 11 Melting and Refining of Gold.- The Wohlwill Electrorefining Process.- Gold Refining by Dissolution/Precipitation.- 12 Gold Mill Tailings.- Disposal of Tailings.- Water/Cyanide Recovery from Tailings Slurries.- Destruction of Cyanide in Gold-Mill Effluents.- Arsenic Removal from Gold-Mine Wastes.- Recovery of Gold from Accumulated Old Tailings.- Appendix A: Conversion Factors.- Appendix B: Gold Production Statistics.- Appendix C: Comparative Long-Term Total Production Costs in Selected Countries.- Appendix D: Primary Gold Deposits and Mines in the U.S..- Appendix E: Gold Mill Sampling and Metallurgical Balance.- Appendix F: Data Commonly Collected During Environmental Baseline Studies for an Environmental Assessment.- Appendix G: Flowchart of Gold Recovery from Copper Refinery Slimes.- Appendix H: Solubility of Minerals and Metals in Cyanide Solutions.


`Certainly this is more of a handbook than an all-embracing reatise but as such it is a first class and concise review of the processing of gold ores and should be particularly valuable to those on the periphery of mineral processing...a compulsory purchase for geologists, mineral economists, financial advisors and middle to senior management, as well as extractive metallurgists.'
International Liaison Group Gold Mineralization

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