OK Lynne,
Just read Tehmina's reply. She's quite right, of course, and the figures I quoted you really referred to saleability. Each smelter had his preferred blend of ores, that worked best for him and influenced which ores he bought, if they contained minerals that would act as useful fluxes, etc. Cornish ores, though generally of lowish grade, often fell into this category, hence their saleability for the purpose, to be blended with higher grade material, possibly from abroad.
Tony Clarke
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From: mining-history <[log in to unmask]> on behalf of Lynne Mayers <[log in to unmask]>
Sent: 27 August 2018 09:12
To: [log in to unmask]
Subject: Copper ore for smelting
Hi everyone,
I am sure I have this information somewhere – but can’t find it. I am trying to find the acceptable range of %copper for sending to the smelters 18th and 19th century. Many thanks.
Lynne
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