"disused"=>"yes","name:nl"=>"Julianagroeve","ref"=>"K730"
"disused"=>"yes","ref"=>"K630","resource"=>"limestone"
"ref"=>"L220","disused"=>"yes"
"ref"=>"L660","disused"=>"yes"
"ref"=>"L750","disused"=>"yes"
"ref"=>"M480","disused"=>"yes"
"ref"=>"M570","disused"=>"yes","heritage"=>"2"
"ref"=>"M530","disused"=>"yes","wikidata"=>"Q2726001"
"ref"=>"M550","disused"=>"yes","wikidata"=>"Q66313550"