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Just read Tehmina's reply. She's quite right, the figures I gave you really refer to saleability. Each copper smelter had their own preferred blend of ores, which influenced what they purchased, i.e. if the ore also contained useful fluxes, etc. Cornish ores often fell into this category, and were blended with better grade ores (perhaps from abroad) by the smelter according to his preference. Tony Clarke ________________________________ 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 If you need to leave the list, send the following message to [log in to unmask] - leave mining-history --------- If you need to leave the list, send the following message to [log in to unmask] - leave mining-history ---------