Sorry mtm100.
From the point of view of a very "rusty" (pun intended) physical rather than extractive metalurgist I invisage the extraction of cobalt ore is not being paticularly onerous.
If I remember correctly it is an important ingredient for making grades of special air hardening steel as well as playing a part of a compound of an accelarant chemical in the GRP industry and no doubt others.
cobalt, page-3
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