Just as an adlib - I haven't read any reports where NML describe the geophysical technique they are using to delineate these veins - so if they haven't mentioned it - it is CSAMT (Controlled Source Audio-frequency Magnetotelluric).
Interesting. Seems to work well in their situation. Might be good in the Birimian Belt (West Africa) too, where there is shallow cover over nuggety gold bearing quartz veins.
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