I haven't dabbled in Ni-Co arsenides since finishing my thesis and
consequent papers in the early seventies. References therein and in Bill
Petruk's summary paperson Cobalt should be sufficient. There has been
little relevant research published since.
The closest anaologue to your occurence may be Bou Azzer in Morocco, on
which there is quite a lot published. Other than this I'm afriad that I
can't really help.
Best wishes,. Nick.
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