- Open Cast Workings
- Open Pit Mining
- Open Work
- Surface workings including shallow shafts, lode workings, open-pit methods and quarrying including some mines of stone, clays, compounds, etc. See also MINERAL EXTRACTION SITE.
- English Heritage
- http://creativecommons.org/licenses/by/3.0 (FISH Thesaurus of Monument Types)
- http://www.english-heritage.org.uk (FISH Thesaurus of Monument Types)
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