About: http://webisa.webdatacommons.org/21843147

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	The general mining methods are surface mining, while some silicates, such as sand, are commonly mined using dredges, from lakes, rivers and waterways.
http://www.w3.org/ns/prov#wasQuotedFrom	mine-engineer.com