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Patio process,  · The patio process is a process for extracting silver from ore. The process was invented by Bartolomé de Medina in Pachuca, Mexico, in 1554.[1] The patio process was the first process to use mercury amalgamation to recover silver from ore. It replaced smelting as the primary method of extracting silver from ore at Spanish colonies in the ...What are those OPECkers up to? | Sepor, Inc,  · So what can we surmise from this graph? Well, prior to 2008, gold and oil seemed to be trading at a pretty steady ratio of 4 g Au per barrel of oil. Suddenly, in 2008, the ratio dropped drastically from 4 g to 2 g per barrel. There is still the relationship, but it changed ...

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