About: http://webisa.webdatacommons.org/168921917

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	it is not because there is no copper, but the native copper is so deep now and most of the mines are full of water so it is just not cost-effective compared to the openpits in Arizona and Utah.
http://www.w3.org/ns/prov#wasQuotedFrom	mindat.org