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TR-34 to Permit M-1977-342 <br /> Environmental Protection Plan <br /> The weathered and unweathered Precambrian Idaho Springs Formation and Silver Plume Granite <br /> are considered to be relatively impermeable compared to the overlying glacial, alluvial and <br /> Troublesome Formation deposits.The low permeability nature of the Idaho Springs Formation and <br /> the Silver Plume Granite have been documented through packer and geophysical testing in the <br /> Precambrian bedrock. These data indicate that the Precambrian bedrock is not capable of <br /> transmitting significant quantities of groundwater as compared to the overlying glacial and alluvial <br /> deposits and show a defined decrease in hydraulic conductivity with depth. <br /> Climax Molybdenum Company August,2021 <br /> Henderson Operations Page 32 of 45 <br />