While the partnership has yet to release a plan of operations for the mine or apply for federal permits, its basic characteristics have been specifically detailed in preliminary assessments filed with the U.S. Securities and Exchange Commission. Additionally, an economic study commissioned by the Pebble Limited Partnership and released in May 2013 provided more details about the proposed mine. Because the deposit’s ore is so diffuse, the mine would require not only an open pit thousands of feet deep and two miles to three miles wide, but also tailings reservoirs to hold toxic mine waste that could cover more than 7,600 acres, or 12 square miles, and would remain in perpetuity.
http://www.americanprogress.org/issues/green/report/2013/06/27/68127/mining-in-alaskas-bristol-bay-region-threatens-a-sustainable-economy-2/
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