In addition, they said, in general MLEM may screen the effects of deeper conductor by
(a) graphite
(b) water filled shear zones
(c) bodies of water
(d) wet clay
(e) graphite-bearing rocks
Our Mag 2 has a EM plate (conductance 210S) at depth around 150m, 300m x 300m in size dipping steeply to SE, apparently positioned at the junction of 2 fault trends.
Therefore, even it has very low conductance, it has its discrete size(with shape) and direction, so above all 5 cases can be clearly excluded.
So far a minor graphite encountered case in the region was when SIR(Sirius) tried drilling at further deeper depth(likely about 600-650m below surface) around Nova/Bollinger ore bodies to find any further deeper possible feeder sill(s)....then they encountered barren materials such as some pyrite, minor graphite and so on then it stopped further drillings.
According to igo.com.au, Nova/Bollinger's sulphide assemblage of the ore mineralogy consists of pyrrhotite(~80-85%), pentlandite(~10-15%), chalcopyrite(5-10%).
I interpret this SIR's Nova(ore bodies)'s higher conductance of 5513S was mainly attributed by contents of 'pyrrhotite(iron sulphide)' as of its high conductance. Please note that graphite is very similar high conductance of pyrrhotite. So higher conductance means it will increase its thickness (of ore body), on the other hand this means it will likely decrease nickel sulphide(,pentlandite) copper sulphide(chalcoprite). Thus, Ni and Cu grades.
Regards,
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