Blue Sky Geoscience has compiled some interesting aspects of the geophysics used in the discovery of the Ernest Henry iron-oxide copper gold deposit.
The downloadable PDF demonstrates:
- Strong association of magnetite with copper and gold mineralisation
- The EM anomaly drilled by the discovery hole was due to a small high grade part of supergene mineralisation near the north end of the deposit.
- Most of the deposit does not have a strong EM anomaly
- Secondary copper sulphides in the supergene zone above the magnetic anomaly contribute significantly to the Induced Polarisation chargeability anomaly
I will add more, including some information on the gravity response sometime soon.
