Most of my career has been concerned with mineral resources in one form or another. This general subject was covered in a previous issue of Geochemical Perspectives (Arndt et al., 2017) so I will not repeat that overview treatment here. Instead I focus on my experience with a particular type of ore deposit, skarn deposits, and the unique geochemical laboratory that they represent. In simplest terms, a skarn deposit forms at the contact between an igneous intrusion and reactive wall rocks, commonly limestone. The strong temperature and compositional gradients between the hot magma and the cooler wall rocks...
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