In Situ Recovery and Remediation of Metals

Current trends in mining are driving the demand for subsurface extraction technologies with low surface impacts that protect surface and ground water. Moreover, the necessity for sustainable mineral extraction technologies has increased as regulatory restrictions and technical challenges to traditional mining grow with production from deeper and deeper remaining metal resources. This book provides a state-of-the-art synopsis of in situ metal recovery and remediation technologies based on both research and commercial projects. In situ recovery uses fluid-based metal dissolution and recovery to extract one or more commodities from a largely intact rock mass using similar processes that create ore deposits. The fluid is circulated through ore by gravity and/or pumps using injection and recovery wells. A processing facility is usually established at the surface of the operation to extract the commodity of interest. The barren fluid is then recirculated back into the recovery circuit. In situ remediation uses similar wellfield technology and chemical processes to stabilize metal contaminants by injecting agents that form stable solids or less toxic species when combined with a contaminant. The fluid depleted in the stabilizing agent is then pumped back to the surface and regenerated. In situ mining or recovery has been successfully applied to several commodities, including uranium, sulfur, evaporites, and copper, which have favorable chemical properties and deposit types for in situ recovery. Cover Copyright Contents Preface Acknowledgments CHAPTER 1 Background CHAPTER 2 Ore Formation by Aqueous Solutions CHAPTER 3 Flow and Reactive Transport in Geologic Media CHAPTER 4 Geochemistry and Hydrometallurgy CHAPTER 5 Drilling and Well-Field Technology CHAPTER 6 Advanced Rock Mass and Ore Characterization CHAPTER 7 In Situ Copper Sulfide Recovery Project CHAPTER 8 Economics and Permitting CHAPTER 9 Remediation CHAPTER 10 Future Directions References Index Back Cover Provides a synopsis of in situ metal recovery and remediation technologies based on both research and commercial projects. In situ mining or recovery has been successfully applied to several commodities, including uranium, sulfur, evaporites, and copper, which have favourable chemical properties and deposit types for in situ recovery. "Text describes in situ recovery and remediation that mimic and accelerate the natural processes of flow and reaction in the earth for the recovery of useful minerals from ore for human consumption and the subsequent restoration and stabilization of the residual rock mass"-- Provided by publisher