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Will there be any perpetuity issues on site with treatment of water?

Sandfire has designed the Black Butte Copper Project for quick reclamation at the end of mine life with no need to treat water in perpetuity on site. We have chosen a cemented tailings facility (CTF) because it offers the highest environmental protection and quickest reclamation of any tailings facility designs we studied. Because the CTF will have no pond of standing water during operations, once the mine closes Sandfire will cover the facility with a 100 mil HDPE liner, weld it to the lower double liner, and cover the liner with 4 or more feet of fill, top soil, and grass. The pump will remain in the CTF to treat and test the small amount of water that may seep until the facility stabilizes and monitoring will continue as long as required by the DEQ.