C1. Distribution of engine houses.
C1. Distribution of tin producing mines.
C1. Distribution of copper producing mines.
C1. Distribution of arsenic producing mines and calciners.
C2. Mine transport networks are closely associated with the location of copper mining.
C3. Ancillary industry sites (engineering and explosives).
C3. Ancillary sites (smelting works) and historic stannary towns.
C4. Distribution of non-conformist chapels.
