Mt Ida


Mt Ida is located 200 km north-west of Kalgoorlie-Boulder, 122 km from the Davyhurst Processing Plant.  The Project hosts the high-grade underground Baldock deposit.

Mt Ida Project Area


The Mt Ida Project area is in the northern-most part of the Mt Ida (or Ularring) greenstone belt, and contains an extensive sequence of mafic and ultramafic rocks with interbedded volcanogenic sediments and felsic to intermediate volcanic rocks. In the Mt Ida area the greenstone belt is folded into a southerly-plunging antiform called the Kurrajong Anticline which has the Copperfield Granite at its core.

Two main mineralised shears at Mt Ida, the Timoni and Dave Lode systems, are strike parallel and located on the western flank of the Kurrajong Anticline. The shears range in width from 0.75 to 2 metres with gold associated with quartz veining, sulphides, and biotite-chlorite alteration. There is also a strong association between gold and copper mineralisation within the Dave Lode.

Historically some 306,000 ounces of gold have been produced from the Copperfield / Timoni area with most of this coming directly from the Timoni mine. The Timoni mine commenced in the late 1950s and was operated for several years extracting some 265,000 ounces of gold at an average head grade of 16.3 g/t Au.


OBM has undertaken an extensive desktop review of the Mt Ida project area. The Company’s primary focus is to explore and develop the high-grade Dave Lode (containing the Meteor, Whinnen and Baldock mineral resources), and to test for extensions to the Timoni Lode. Infill and extensional RC and diamond drilling is planned.

Other advanced targets include:

Bombay: An anomaly with a strike-length of approximately 3.5 km is defined by auger geochemistry and RAB drilling. There appears to be immediate potential to define a supergene resource within the prospect, and targeted deeper drilling may intersect higher grade bedrock shoots.

West Nell: West Nell prospect was originally identified as a 500m long N-S trending +20ppb gold in auger anomaly with associated anomalous copper. Historical RAB drilling of this auger anomaly identified significant gold in weathered and sheared anorthosite including 8m @ 2.6g/t & 10m @ 1.5g/t. Mineralisation is associated with quartz veining and ex-sulphides within sericite-fuchsite schist with biotite alteration.


Mt Ida Project – Mineral Resources

The table below summarises the cumulative gold production from the project based on the available records;

Project Production Period
Pre 1950 1950-1980 1980-2000 2000-2008
(oz Au) (oz Au) (oz Au) (oz Au)
Mt Ida U/G  35,000 265,000
 –  6,800

Historical Total oz Au;

Tonnes Au g/t Au Oz
 547,000  17.20 306,800

Mt Ida Project Area – Historical Production Total oz Au