> There would seem to be more danger to the economy by being flooded with rare metals I think that this case is not directly comparable to the price revolution

> There would seem to be more danger to the economy by being flooded with rare metals I think that this case is not directly comparable to the price revolution; in the cases you've linked, Gold==Money, and so by bringing back gold the Spanish massively increased the money supply (from the first article, "Prices rose on average roughly sixfold over 150 years. This level of inflation amounts to 1–1.5% per year, a relatively low inflation rate for modern-day standards, but rather high given the monetary policy in place in the 16th century"). In the case we're discussing, Metal!=Money. The more metal you bring back, the lower the price falls, until it reaches a new equilibrium where it's no longer economical at the margin to bring back more. This would significantly affect certain markets (i.e. mining, industrial processes that consume these metals), but it's not the same thing as creating money; you can't spend nickel, you need to find someone who will buy it from you in order to turn it into money.