As for lead mines. There are plenty of disused ex lead mines in Upper Wharfedale. Bradford University was analysing the remains of pollutants from them when I worked there about twelve years back. I was doing some of the analysis.
Bob Peggs's "Leaving the Dales" recorded by his band Mr. Fox (The complete Mr.Fox - Transatlantic Records - two LPs re-released as one package in 1975) mentions lead mines.
Quack!
Geoff the Duck.