About: http://webisa.webdatacommons.org/373572286

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Sulfide-bearing rock exposed to air and water yields sulfuric acid, producing forms of pollution (including mercury, arsenic, lead and other toxins) that ??? according to PolyMet???s own documents ??? would last at least 500 years.
http://www.w3.org/ns/prov#wasQuotedFrom	startribune.com