Wartime tin and wolfram.

From Venning’s Postal Directory of 1901:

Trebartha-Lemarne Tin Mine is situate on the Trebartha Estate very near to the mansion of F R Rodd Esq. and is worked at present by water power, and very recently a large outlay has been made in erecting works for separating tin, arsenic and other minerals. It has been worked by a local company for 7 years, Mr J B James of Plymouth is the Purser, and Capt H Bennett of Redmoor [is] the Manager. The mine has a remarkable ancient history.”