HEAP LEACH CLOSURE WORKSHOP SERIES 2001

Workshop #1
January 26, 2001
Estimation of Leachate Quantity

• Brochure
• Hydraulic Behavior of Heaps: Estimation of Leachate Quantity (Dr.Scott W. Tyler)
• Presentation of Field andLaboratory Data (Dirk van Zyl,John LaBarbera)
• Draindown Data from A Number of Mines (Jeff Parshley, SRK Consulting)
• Utility of Laboratory Drain Down Rate and Volume Tests (Gene E. McClelland, McClelland Laboratories)
• Preferential Flow Considerations When Designing a Heap Discharge System (Tom Myers, Great Basin Mine Watch)
• Hydrological Modeling and Field Studies of Heap Detoxification (Michael E. Henderson, P.E., SRK Consulting)
• Comparison of Modeled and Observed Drain Down at Casino/Winrock (Chuck Zimmerman, Brown and Caldwell)

• Brochure
• Controlling Processes and Modeling Approaches (Dr. Ulrich Mayer)
• Presentation of Field andLaboratory Data (Dirk van Zyl,John LaBarbera)
• Unsaturated Reactive Transport Model for Arsenic Oxyanions in Heap Leach and Waste Rock Facilities (D.L.Decker, Desert Research Institute )
• Heap Leach Effluent Data for Choquelimpie, Chile and Other Operations (Terry Albert and Carl Defilippi, Kappes Casssiday & Associates (KCA))
• Chemical Degradation, Volatilization, and a Comparison of Cyanide Analytical Techniques at a Heap Leach Pad (John Bennett, Brown and Caldwell and Max-Noel Shen, Quicksilver Consulting Chemists)
• Factors Affecting Transient Change in Water Quality in Heap Leach Pads (Dr. William M. Schafer, Schafer Limited LLC). (Original) (Edited)
• Long Term Chemical Predictions of Heap Leach Draindown Chemistry (Jeff Parshley, SRK Consulting)

• Brochure
• Appropriate Concepts and Criteria for the Design and Construction of Cover Systems (G.Ward Wilson)
• Presentation of Field andLaboratory Data (Dirk van Zyl,John LaBarbera)
• Numerical Simulation of Solute Transport in a Spent Heap Leach Pad (George Danko)
• Planning for Closure:Field and Laboratory Investigations for Soil Cover Design (Peter E. Kowalewski, SRK Consulting)
• Reclamation and Closure of the AA Heap Leach Pad at Barrick’s Goldstrike Mine(Johnny Zhan)
• Big Spring Project Heap Pad Closure Program (Jonathan Gorman)
• Instrumentation and Monitoring of Heap Leach Reclamation Cover Systems (Milczarek, M.A., J. Vinson and D.P. Hammermeister)
• Tests of Final Covers in Arid and Semi-arid Areas Using Innovative Water Balance Monitoring Systems (Bill Albright, Desert Research Institute)
• Soil Moisture Array :Stage I Leach Pad (Christy Granquist, Coeur Rochester)

• Brochure
• Optimizing Heap Leach Pad Closure (R.Buffington, Andy Davis, C.Moomaw and G.G.Fennemore)
• Regulatory Issues and Experiences with Mitigation (Mary Beth Marks)
• Mitigation Approaches and Example Water Quality Data (Dirk van Zyl, John LaBarbera)
• Mitigation Methods
• Points to Ponder