Elemental sulphur is found in regions of the
world that either are, or have in the past, experienced volcanic
activity, and has long been mined in these areas. This was, for
example, one reason a settlement was developed on one of the Galapagos
Islands as long ago as 1893. Deposits may be close to the surface,
and be extracted by open cast mining, or may be deeper underground
and are extracted by the Frasch Process.