In-situ ROM Heap Leach Characterization and Monitoring

Location

Chile

Client

Confidental

Project Description

GSA conducted a large-scale field investigation to evaluate solution and air flow dynamics in an active secondary sulfide ROM copper heap leach facility. Large test pits were constructed in fresh and leached material to determine in-situ bulk density and hydraulic conductivity and to collect samples for hydraulic property and mineralogy testing. Deeper investigations used sonic drilling and coring to depths of 50 meters at various locations to assess hydraulic and mineralogical properties. Selected boreholes were instrumented and monitored for phreatic levels, temperature, oxygen, moisture content, and solution chemistry at variable depths. In addition, the air injection system was instrumented and monitored for air flow velocities and pressures to determine air injection dynamics. These data were used to determine the effects of ore permeability, lift height and air injection design and efficiency on copper recovery.

Project Highlights