There was no such thing really. You needed a good blend of ores and copper in other forms for effective extraction through reverberatory smelting.
Pre-print of an article I published with the Trevithick Society here for free download:
http://www.academia.edu/9441368/Where_did_all_the_copper_go_Reconstructing_supply_chains_between_mines_and_smelters
Tehmina Goskar
@tehm
On 27 Aug 2018, at 10:12, Lynne Mayers <[log in to unmask]> wrote:
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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