A geosynthetic clay liner for containing low pH, acidic fluids including a dry blended mix 90%-99% by weight bentonite and 1%-10% by weight high molecular weight cellulose ether polymer, and a method and containment including the liner to protect an environment around a site having low pH, acidic fluids. Sprinklers AcidisRecycled Mixing and Separation Acid Extracted Coppergoesto Electrowinning 't Percolating Chemical Solution (Dilute Sulfuric Acid) 60-70% Pure Copper Leaching in Solution goes to Solvent Extraction Slight Crushed Ore Heap Slope23 Collection Pool Impeetrale LyerPregnant Leach Solution.