| http://www.w3.org/ns/prov#value | - For example, gold production involves the use of toxic Production costs of a barrel of petroleum were estimated in materials such as cyanide, mercury and arsenic, and their 2004 to vary between $1 dollar in the lowest cost zones (West inappropriate handling is frequently a source of health and environmental problems (???Why mining is bad for your river???, World Rivers Review, Vol. 12, No. 5, Octo
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