On the left are examples of: Streamworks, Openworks, Lodeback workings - methods used to extract tin ore. Associated with streamworks are Tinners' Huts (or Lodges).
To crush the ore stamp machines were used and these used "mortar" stones. The ore was then smelted - the best fuel being peat charcoal. To make it dried peat was heaped into mounds, covered in turf and then fired (the turf preventing burning). The remains are called "meilers". Molten tin was poured into "mould" stones to create the portable ingots.
LiDAR image showing 3 openworks, O Brook and tributaries
LiDAR image showing meiler clusters and peat tyes, River Yealm