There are also extensive areas of medieval tin-streaming on Dartmoor, Bodmin Moor and St Austell Moor in particular. Such areas contain individual sites and monuments of archaeological importance both to local communities, and as part of the setting of the nominated Site.

Principal differences in comparison with the nominated Site:

• too geographically remote from nominated bid areas;

• insufficient survival of coherent mining landscape;

• range of components not large enough to be proposed as additional elements of the nominated Site.

Copper mining was relatively widespread in the United Kingdom but only Parys Mountain in Anglesey (Wales) seriously challenged Cornish production; indeed it exceeded it for a period during the second half of the eighteenth century. The copper was principally extracted by opencast methods which created a spectacular mining landscape. The nearby copperore harbour of Amlwch and its associated smelting and industrial complex is an exceptional late eighteenth century survival.

Lead- and zinc-mining in the United Kingdom shared a number of technologies with Cornish mining, particularly water-power for pumping, ore-processing technologies and, though on a much smaller scale, steam-pumping.

Lead and zinc was mined extensively in northern England: in the east and west Pennines; the Peak District of Derbyshire, where at least three Cornish engine houses survive; in the Yorkshire Dales at Grassington, and in Lancashire. In central England it was mined in Shropshire, notably at Snailbeach and Tankerville where there are Cornish engine houses. In the south west, outside Devon and Cornwall, lead was mined principally in the Mendip Hills, Somerset, where evidence of Roman mining exists.

Lead was mined in all the Welsh counties. Water-power predominates but steam-power was adopted, using Cornish engines, particularly in the Flintshire/ Denbighshire mines. Several engine houses survive in addition to one at Frongoch.