This is inside one of the long narrow buildings where the wet clay was spread out to dry into hard pieces and then made smaller and smaller for shipping. There were furnaces under the floors and they were kept burning 24/7 such was the demand for the china clay at the time ( mid 1800's to 1940'ish). There are still clay workings in operation in Cornwall to this day, but on a very much smaller scale. Thank you all for your kind comments and FAVS on yesterday's pic and for placing it on PP.
@briaan Thank you. Like any mining it was very heavy, back breaking work. There were women employed as 'Bal Maidens' who did sorting and packaging. During the war years the mining was mainly done by women, but by then there was much more machinery doing the very heavy work.