About: http://webisa.webdatacommons.org/146669862

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	For sulfide ores, any arsenic which is present is an undesired accompanying element and must be removed from the calcine and from the roaster gas.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com