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Mount Morgan
Australie
La combinaison de la polarisation provoquée et de la magnétométrie permet de cibler un dépôt dans un contexte de formation de fer avec succès.
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Mount Morgan is a banded iron formation (BIF) where gold is associated with the replacement of Iron oxide by Iron sulphide. The deposit lies beneath laterite. |
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A strong positive magnetic anomaly is directly associated with the magnetite. The profile is locally impacted by a negative aeromagnetic signature. The negative component of the anomaly is explained by the replacement of magnetite (oxide) by non-magnetic sulphides, primarily pyrite. |
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A dipole-dipole IP survey using a 50-metre a-spacing, with n = 1 to 6 was used to delineate the favourable ore setting. The elevated apparent chargeability in the magnetic low indicates sulphide enrichment. |