I think the market wants nickel.
Not so excited about iron/copper/zinc.
BK
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Semi-massive
iron, copper,
183.8 201.2 17.4 zinc sulphides
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Wikipedia:
Forms of iron sulfide
"Iron sulfide" exists in several distinct forms which differ in the stoichiometry and properties:
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Pyrrhotite, Fe1-xS, a mineral as well as the waste product of the Desulfovibrio bacteria, pyrrhotite displays ferrimagnetism.
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Troilite, FeS, which has similar material to pyrrhotite, but does not possess ferromagnetic properties.
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Mackinawite, Fe1+xS, the least stable from of iron sulfide, mackinawite has a layered structure.
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Pyrite, mineral form of FeS2 with a gold-like appearance, making it also known as "fool's gold."