Here's the makings of a listing. Given time, this can be expanded with descriptions etc.:
North Wales:Benallt (later joined to Rhiw), Gwynedd (Caernarfonshire), Manganese, SH222281
(Davel, you have this listed as SH536535: is this the same placeor are there two Benallts, both with ropeways?!)Bwlch-gwyn, Clwyd (Wrexham), Lead(/silver?), SJ262534/SJ266534 (described as a "foul old working"!)
Cae Coch, Gwynedd (Gwydir Forest), Pyrites (suplhur), SH777653 (no.2 Adit), Ropeway built 1917, worked to 1919
(Old) Clogau, Gwynedd (Merionethshire), Gold, SH675201
Cwm Bychan, Gwynedd (Caernarfonshire), Copper, SH603473
(Old) Diphwys, Gwynedd (Merionethshire), Manganese, SH669238 (doesn't appear to be in the AN database??)
Egryn, Gwynedd (Merionethshire?), Manganese, SH605205, Ropeway built 1917 (this is listed as slate in the AN database?!)
Figra, Gwynedd (Merionethshire?), Gold/Copper, SH663192 (I have also seen this as Firga and Vigra)
Frongoch, Lead/Zinc, SN723745, Aerial ropeway built 1914 to convey waste to a crushing plant at Gwaithgoch (was this actually built?!)
Garreg Fawr, Gwynedd (Caernarfonshire), Iron, SH542575/SH544579? (not in AN database)(ropeway transported ore to Llanberis?)
(Lower?) Hook, Pembrokeshire, Coal, SM 970111(?), (not in AN database)
*** No details below here - to be done shortly! ***
Llyn Glaslyn (Copper)
Mochdre (Shale?)
Moel Ispri (Gold)
Nantymwyn - some remains of a ropeway?
Rhinog (Manganese)
Rhiw (Manganese)
Rhos (Slate)
Trecastle (Lead)
Ystrad (Iron)
South Wales:
Dinas (Quartzite)
Hello again darkness, my old friend...