Maybe Slitt Mine, its a nice walk up through the wood alongside Middlehope Burn from Westgate. Not sure if its an SSSI but the council have produced a leaflet about the geology you can see in the stream and the mine remains so maybe so.
The mine itself isn't open but the surface remains are interesting there are bousesteads, the stream has been bridged over and there are the remains of the gritstone bed for the shaft winding machinery. The remains beside the stream are from a leadmine but there are openworkings on the hill behind (on the same vein) which were for iron.
Slitt mine remains
[img]http://www.aditnow.co.uk/showimage?f=/community/Personal-Album-78-Image-003/[/img]
West Rigg iron mine on the hillside just above Slitt Mine
[img]http://www.aditnow.co.uk/showimage?f=/community/Personal-Album-78-Image-004/[/img]
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