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There are a number of detailed articles about the Llanberis Mine in past Plymouth Caving Group newsletters. As well as the mortar stone, there is one opencast site which appears as if it might be of early (pre - 18th Century) age. I have a copy of a Plas Tan y Bwlch paper discussing this, also correspondence with David Bick about the site, age of the mortar stone etc. The underground workings are very extensive, as far as I know no old plans exist; we have continued explorations in recent years (along with some PUG members) which involves quite technical SRT. Permission for this was obtained from the CEGB (obviously the site has since changed ownership). Please contact me direct if you wish further info, or are planning any other trips to the area. Alasdair Neill.