Dear Dave,
Find any book on the Conwy Valley mines and it will detail the mines
producing Sulphur in this area.
Basically, any mine that produced Iron Pyrite in the UK between 1850 and 1945
was producing for Sulphur - 'mostly' for Sulphuric Acid production. The Govt.
in WW2 were quite keen for supplies of sulphur, so numerous mines were
prospected or opened for Iron Pyrite. There were a few exceptions, the Cwm
Rheidol Mine in Mid-Wales being one, where the mine was not exactly 'safe',
so the mine waters were 'settled' in tanks to recover Yellow Ochre - the
remains of same are still there if you want to photograph, but most books on
the area show p.graphs on this mine.
I know this is rather a generalised response, but it is the true bare bones
of things, and I hope will be of help to you.
Regards, Bernard.
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