Sorry, when you said refinery I was thinking oil. I was going to use that as an example for milling when I replied to you.
Anyway, we use to send a sponge, which is the gold and silver left after amalgamating. Usually contained about 1,500 ozs gold to Johnson Matthey in SLC for procesing. They would charge around $30 per ounce to process and would sell the product. Normal back and forth assays regarding the gold/silver content until both companies agree and then they smelt the product to 9999.
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