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In message <[log in to unmask]>, Bjarne Erik Roscher <[log in to unmask]> writes >I'm looking for a list of cobalt mines and blue color works in Britain >between 1800 and 1900. Especially I'm interested in the production and >export volume of cobalt colors. An irregular deposit of low grade cobalt/nickel ore was found in a haematite mine on Moel Hiraddug, Flintshire in about 1869. The deposit was worked until about 1880 when cheap imports made further extraction uneconomic. Over 1900 tons of ore were raised. -- Tony King