notdavidgilmour
Member
I'm currently digging a vertical shaft (in the corner of an existing back filled shaft) into an old lead mine, however, it keeps collapsing in and is getting quite dodgy being at the bottom of the hole, with big boulders falling on me. The hole isn't really big enough to scaffold. When I was helping on a dig out in Matienzo, they used a convoluted pipe to line a boulder choke. Has anyone else used this method and if so, I'd really appreciate some advice on diameter of pipe used and anything else I should be thinking about.
Cheers,
Rob
Cheers,
Rob