About: http://webisa.webdatacommons.org/83437935

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	costs at its mines are subject to variation due to a number of factors such as changing commodity prices, ore grades, metallurgy, revisions to mine plans and changes in accounting principles.
http://www.w3.org/ns/prov#wasQuotedFrom	marketplace.org