To the Editor:
Uranium mining - at what cost to our water?
Powertech/Azarga Uranium Corp proposes mining uranium via the in-situ leach process at Dewey-Burdock near Edgemont. Let's look at a few problems with this proposal:
• In-situ leach uranium mining is done directly in a water-bearing aquifer.
• Powertech/Azarga wants to mine two of Fall River County's largest aquifers.
• Rock layers around the mining aquifer must provide adequate confinement to prevent contamination
• Studies indicate rock layers on-site don't have adequate confinement.'
• On-site are approximately 4,000 old drill holes, many drilled before regulations required lining or closing properly; most holes conditions are unknown; at least one old drill hole leaks to the surface.
• Studies indicate water leaks between formations implicating old drill holes and fractures.
• Huge chimneys (breccia pipes) go through otherwise impermeable rock layers in the area, undermining any finding of adequate confinement.
• Potential full-scale uranium mining plan for the Black Hills will demand an inordinant extraction/ pollution of an already compromised aquifer system. While salty, aquifers to be mined are providing water for ranching, domestic use, and can be filtered for drinking.
• Powertech/Azarga would not pay a dime for the water used, and the quantity is more than the water used by Rapid City.