Might not be excessive, but I certainly wouldn't have wanted to fall down it!
As mentioned in a prevoius post, I went down the shaft in 1992 - it's about 30 - 40ft deep to a small closehead & blocked level heading outbye.
arr yes, I think I saw the blocked level in the lower reaches of the quarry. The level itself may be blocked but, when I went it was possible to squeze into it after about 20mins of rubble clearance (no tools involved).
I didnt actually get inside mind, I didnt want to risk it due to a slab longing to fall above the sqeeze; but I might have a further look next time. I was speaking to Alastair Cameron about it, and apparently theres some axles in the lower level, propped against the side of the tunnel.
Kein geneis kanaf - Cain gnais canaf
Byt vndyd mwyhaf - byth onddyth moyav
Lliaws a bwyllaf - Líows o boylav
Ac a bryderaf - ac o boryddarav
Kyfarchaf y veird byt - covarcav yr vairth
Pryt nam dyweid - poryth na'm dowaith
Py gynheil y byt - Pa gonail y byth
Na syrch yn eissywyt - na soroc yn eishoyth
Neur byt bei syrchei - nour byth bai sorochai