Dear Phil,
Not quite. May I refer you to the Mins.Stats. (Burt. et al), since zinc
production - & it's increase (pertinent to a gradualy increasing importance
and value as a commodity), is clearly evident via this source of info..
Frongoch Mine in Wales for example, gained many years of production. The
Taylor's left considerable reserves to be reaped by Kitto. As to Derbs.,
well, one or two mines did well out of the mineral.
Regards, Bernard
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