Regarding the debate on the difference between mining and
quarrying.
I agree with Roger. Both involve the extraction of material from
the earth.
The product of mining is a material which is of no use until smelted
or treated chemically, to extract some valuable constituent such
as a metal or salt ( copper, iron, sodium nitrate, etc ).
Quarrying is the extraction of stone which is used unaltered for
its physical properties -- building blocks, roadstone, aggregate
for concrete, etc.
Both mining and quarrying can be carried out at the surface or
underground -- hence, as Roger says, the excavations for Bath
stone are underground quarries.
Tony Brewis
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