The Cwmystwyth Mines site has extensive remains of lead and other non-ferrous metal mines. The site was first mentioned in 1535, although much earlier workings were known to have existed. Today even on a sunny day the site looks dark and dead. On much of the site little grows due to the contamination of the soil.
Continued Reflections from my World. 
I imagine the air is probably contaminated with microscopic dust particles as well.
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It very windy here so guess unless you start digging around you are fairly safe. Rocky rather than dusty.
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If that was a sunny day outing for you, I would not want to visit on a rainy one! Very interesting place.
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Wales is very wet and grey on a raining day!
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