Don't forget the geological aspects.
(1) Geological uniqueness/classic example of type: In the US White Pine Copper in Michigan (the only large shale-hosted stratabound Cu deposit in N.Am., one of only 3 such in the world (Kupferschiefer, Zambian Cu-Belt). Cornish Tin and Kaolin deposits (both unique & classic)), Parys Mtn (only? ?Sedex Cu in UK).
(2) Quality of Mineral Specimens/Importance in development of mineralogical science:
In the UK the Lake District hematite mines (famous for the quality of specimens),
Peak Didtrict Blue John mines; Scottish strontianite mines/occurrences.
(3) Importance in evolution of geological science:
Cornwall, Peak District, Welsh anthracite mines.
As with other reasons for historic designation - no need to preserve every example (e.g. all tin mines in Cornwall), but only representative or outstanding examples (e.g.: in Cornish case perhaps a mine that has been extensivelty studied and shows paragenesis and alsdotransition to Cu ores at depth).
John
John Berry Associates
Geology & Remote Sensing
5000 Beverly Hills Drive
AUSTIN, TX 78731, U.S.A.
+1-512-452-8068 (Voice)
+1-512-413-9270 (cell)
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