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|To study the hydrogeological processes that control the movement of water through unsaturated waste rock, an intermediate-scale (8m x 8m x 5m) waste rock pile has been constructed and instrumented. The constructed pile is monitored for moisture content, matric suction, temperature, matrix water chemistry, gas chemistry, gas pressure, rainfall, evaporation, discharge volume and discharge chemistry. The pile is built upon a grid of 16 contiguous lysimeters. The experiment is designed to investigate the mechanisms that create rapid water flow through a pile and its exchange with slower-moving matrix water.|