Some rare earth metals (such as neodymium) are about as rare as nickel or zinc. Perusers of REM articles should have on hand the following chart (rare earths i

Some rare earth metals (such as neodymium) are about as rare as nickel or zinc. Perusers of REM articles should have on hand the following chart (rare earths in blue, commercially impt elements in red). https://en.wikipedia.org/wiki/Abundance_of_elements_in_Earth%27s_crust https://en.wikipedia.org/wiki/Abundance_of_elements_in_Earth... And the ones mentioned in the article are more abundant than silver. This is not to say that they will be easier to extract than silver, but it does give a perspective.