About: http://webisa.webdatacommons.org/328903654

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	Copper, used mostly in building construction and electrical materials, is produced at about 40 mines in the United States and substantial reserves exist.
http://www.w3.org/ns/prov#wasQuotedFrom	usgs.gov