Not sure about etiquette of reviving 10 year old thread - however...
Was up there yesterday. Explored the incline, then had an interesting time negotiating fallen trees on the track from the top to the mine. Pleasant underground visit, inappropriately dressed in shorts and trainers.
But the interesting thing was on the way down. There's a big landslide, and the material looks quite 'orey', maybe reminiscent of a hush. It's over twenty years since I was last there, so, it's relatively recent.
According to the survey, I think the lower adits are below it, but I did wonder if it's mine related.
Robin