IMG at least, elves can get copper and maybe other metals by growing it on trees - this was published but I'm not sure whether the source is still in print. In our world, plants can be quite good at concentrating heavy metals from the soil and a stronger effect for special elf-raised plants in Glorantha seems plausible.
I don't believe elves would mine at all - that seems like an activity of Maker, not Grower. How plentiful that makes metal compared to its availability to humans is a matter for each world creator.
Andrew
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