Magnetism and Iron Oxides

As an IOCG deposit should, the Prospect shows a great amount of magnetism.  In the magnetic map of Arizona below, the high magnetism of the Prospect can be seen at the tip of the arrow.  By zooming, a small light pink area can be seen where the Prospect is located.

To verify this, a small, but powerful Neodymium magnet attached to a piece of dental floss was used to conduct a magnetic survey throughout the Molly Marie Prospect and the results were spectacular.

A 400 to 500 yards wide zone of highly magnetic granite if found surrounding the caldera. The magnet shown is stuck to a vertical face.  This is albite-magnetite alteration.
Albite Magnetite alteration (magnet in center)

Much of the basalt in the main Willow Springs wash and others has very high magnetism.  The magnet by the hammer in this photo  is stuck to a vertical face.

Magnetic Basalt

In the photo below, the altered basalt below the rock hammer is highly magnetic and the basalt above is non-magnetic.  This is evidence of the hydrothermal activity that occurred beneath the basalt.
Lower Alteration zone of Basalt (highly magnetic)

The altered basalt below is highly magnetic, and the magnet is stuck to a vertical face.
Highly magnetic Basalt

The below is Hematite breccia from Cerro Negra in the field.  This likely originated from the boiling zone at the rhyolite porphyry.
Massive Hematite Breccia

The below is from a hematite breccia pipe from Cerro Negra.  It is very slightly magnetic.  Note: hematite by itself is not magnetic.
Sawn Hematite Breccia

The rock below has veinlets of silica and magnetite and is from a breccia pipe in Area 1.  The wider veinlet is very magnetic.
Magnitite Veinlets

This breccia is from the volcanic neck of the caldera, and it is more magnetic than the red rhyolite porphyry.
Rhyolite Breccia

This is a hematitic breccia from near the base of Cerro Negra.  It’s magnetism is unknown.
Hematite Breccia

This is exhalite from area 1, it high in hematite, and its magnetism was not tested.
Saccharoidal silica gossan

This banded Chert shown below, in Area 3 is magnetic.
Banded Chert

This slab of banded chert is magnetic.
Sawn Banded Chert

This breccia from area 1 is magnetic.
Chert Breccia with abundant Magnetite