The Mai magnetite occurrence is located on the south western flank of Mount Edinbourgh, approximately 900 metres north of Braden Creek.

The area is underlain by a northwest- trending limestone roof pendant, which in turn is underlain by quartz diorite of the Mesozoic and/or Paleozoic Westcoast Complex.

Locally, a body of medium to fine grained, massive magnetite is exposed in cliffs over an area of 40 metres in height and at least 30 metres along slope, roughly east-west. Adjacent to the magnetite is a garnet-pyroxene skarn, which appears to have a mafic-volcanic protolith. The host rock is an altered mafic-volcanic. The showing is close to the contact with the intrusive diorite that underlies most of the area.

Another outcrop, 4 metres by 4 metres in size, of massive magnetite is present in a small creek approximately 25 metres to the north west of the cliffs. An adit that was apparently targeting this outcrop is located directly beneath it in the creek. Approximately 50 metres further to the north west a few smaller pods of massive pyrrhotite are present in another set of cliffs.

In 2003 through 2011, Emerald Fields Resources and Pacific Iron Ore Corporation completed various exploration projects in the area as a part of the Pearson project. These included prospecting, diamond drilling, ground and airborne geophysical surveys, geological mapping and geochemical sampling. The occurrence was identified in 2007, after a ground inspection of a previously identified magnetic anomaly. In 2008, three diamond drill holes, totalling 622.24 metres, were completed.