What is the common ratio of ore/slag in an ancient smelting site?

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Amin Nazer

I suggest you check:

T.G. Goonan, "Flows of selected materials associated with world copper smelting". U.S.G.S, 2005.

Sasan Seyedein

Thanks.

Bartosz Mikoda

I think it is unmeasurable to obtain a single ratio for the whole globe, since virtually every location in the world that was associated with ore smelting in ancient times (contemporary as well) has a different input parameters of the process, such as ore composition, technology, even when desired output (namely metal) is the same worldwide.