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Welsh Wezzit

I'd also vote for Trecastell. A big mine near Llangeleynin in the Conwy Valley. A lot of workings were accesible around the 60s , but the entire site is now obliterated. The wheel structure on this website looks very similar.

 
Thanks very much Tom and Robin, I think you've finaly solved the mystery for me. We stayed regularly in my great Aunts caravan near Dyserth and thats where I thought it was.
We also stayed in a carvan in the Conwy Valley quite often though! Memory playing tricks after nearly 60 years.
Cheers!
 
Wasn't a particularly nice day in the end, and photos were crap. However. Some workings. This shows an excavation along a vein leading to an area with a lot of spoil at the top. There's an ore processing area some distance away. I'll post some others (still crap) over the next few days.

PXL_20230728_155413419.jpg
 
Unusually, listed as zinc and managanese, indeed one of its names alludes to the later. The next photo will probaly give the game away.
This clue caused me a lot of difficulty as I thought I ought to recognise the photos. I now realise it is a site I refused to visit myself in 1972 as it would compromise the purity of my scientific method. Surely it must be Moelwyn Mine alias Mango?
.
 
Yes. That's the one. It is Moelwyn (Zinc) Mine/ Pwll Mango. Odd that it doesn't have lead, but maybe even the zinc moniker was to raise its profile from being a lowly managnese mine in the eyes of investors? I think that some workings were ecountered when the alignment of the Ffestiniog Railway was re-routed to enable flooding of the reservoir in the early 70s.
 
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