I reccomend taking a look. There is all sorts.
Slate, Limestone, Ironstone, Coal, Copper, Iron, Gold (small, silver (small), lead, zinc & more unusual things like Wolfrom. Tours?
There is one oa Threlkeld quarry, but its a re-constructed lead mine. Honister tour is great, but there is little in the way of total exploration. There are some enormous mines like Greenside, and Coniston,and Honister. Most of the slate mines are safe to explore, but sany of the metal mines can be a little dodgy. Big limestone mine somewhere in yourshire; easy to get lost in according to relitives.
Linden
Kein geneis kanaf - Cain gnais canaf
Byt vndyd mwyhaf - byth onddyth moyav
Lliaws a bwyllaf - Líows o boylav
Ac a bryderaf - ac o boryddarav
Kyfarchaf y veird byt - covarcav yr vairth
Pryt nam dyweid - poryth na'm dowaith
Py gynheil y byt - Pa gonail y byth
Na syrch yn eissywyt - na soroc yn eishoyth
Neur byt bei syrchei - nour byth bai sorochai