| http://www.w3.org/ns/prov#value | - One major concern is that sulfide waste rock contains heavy metals such as arsenic, cadmium, chromium, copper, lead, nickel, silver and zinc.[13] When sulfide waste rock is exposed to rain and snow, these metals leach into surface water and groundwater.[14] According to the U.S. Environmental Protection Agency, ???[t]he resulting fluids may be highly toxic and, when mixed with groundwater, surface
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