Was there for a wander, weekend before last. Not a massive amount to be seen really. Asheton Mine New Level is at the end of someone's garden, and a man on the roof made a closer look difficult.
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The trial marked on the old map is obscured by a concrete dam which issues a trickle of water.
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Cornish Row, where the Cornish Engine House is located is the site of 3 or 4 private dwellings, and the drive entrance if adorned by a Private, Keep Out sign. I guess you could hang about here an wait for one of the owners to emerge walking a dog and ask permission.
This would also give access to the area of rough ground marking the site of the Penrhyn Du Mine. Best I could get here was a photo over the fence.
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There doesn't appear to be a way from up here down to the alleged adit at Porth Bach which was a bit further North than anticipated. I think you'd need a pretty low tide and go around the headland near the old lifeboat launch, then clamber on the rocks. The tide wasn't low enough for this.
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An finally, the Old aidt should be somewhere directly above the car park. We followed the little valley up via path through undergrowth, but found nothing. The photo of the adit makes it look like it's somewhere a bit more open, so not sure exactly where it is.