About: http://webisa.webdatacommons.org/210419962

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	Over time and during mining operations, the rock formation or other strata above the mine ceiling may tend to compact and/or slough, thus allowing the roof plate to loosen thereby endangering the integrity of the mine ceiling.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com.au