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The whole mine is largely shattered and not in particularly good condition. Chamber 1 East was possibly the biggest underground chamber in the slate industry, being several colossal chambers worked into one void – so big in fact the roof couldn’t support itself any longer and it collapsed. The top third of the chamber remains intact.
I have checked Moulding (2006). The first sentence is used to describe Rhosydd, not Croesor, and he states that most of Croesor, apart from Chamber 1 East, is in reasonable condition. The claim that it is "possibly the biggest underground chamber in the slate industry" is not verifiable, as Moulding is a mine explorer, rather than an expert on the slate industry, and so does not count as a WP:Reliable source for this type of information. Bob1960evens (talk) 10:24, 1 April 2013 (UTC)[reply]
I have also added {fact} templates and a {Manual | section} template to the final two paragraphs. They are unsourced, contain advice like "(but take your own anyway)", and statements like "the first pitch rope is worn to the core a few meters from the bottom", neither of which is encyclopedic. If they were sourced, I would rework them, but with no sources, it is difficult to know what to do. Bob1960evens (talk) 11:53, 1 April 2013 (UTC)[reply]
