| http://www.w3.org/ns/prov#value | - Substances in tailings and waste rock accounted for 8.5% of total releases and transfers reported to the NPRI for 2009: 8.3% for tailings and 0.2% for waste rock.It is important to note that a pollutant???s potential to cause harm to human health and the environment depends on a variety of factors, including whether it is released to air, water or land; its toxicity; if and to what extent it is br
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