Like New Mexico, the Arizona Department of Environmental Quality doesn't routinely require liners to prevent groundwater pollution from new copper mines.
Instead, ADEQ requires all new mines to produce the best available demonstrated control technology to get a permit allowing them to operate and showing they aren't likely to contaminate groundwater through their mine tailings.
For copper mines and precious metals such as gold, a mining company can use a system combining a synthetic liner with a less permeable soil layer lying below to keep pollutants from seeping underground.
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