Production planning for the mine is supported 80% by proved ore
reserves and 20% by probable ore reserves, sufficient for the first 10 years of production.
Measured Mineral Resources within the design convert to Proved Ore
Reserves and Indicated Mineral Resources within the design convert to Probable Ore Reserves, after consideration of all mining, metallurgical, social, environmental, statutory and financial aspects of the project.
Reserves: As of December 2003, Total Ore Reserves of 62.3Mt (grade 2.3ct/t), made up of Proved Ore
Reserves of 44.8Mt (grade 2.3ct/t) and Probable Ore Reserves of 17.5Mt (grade 2.4ct/t).
Reserves at Mount Isa amount to 70 Mt of proved ore grading 3.2% copper, while probable reserves amount to 55 Mt grading 3.7% copper.
The company also has a very large gold-copper operation near Parkes, in western New South Wales, in which several associated deposits have over 40 Mt of proved ore assaying from 1.1 to 2.2 g/t.
Gwalia Consolidated operates the Sons of Gwalia mine in Western Australia which has 2.9 Mt of proved ore grading 3.4 g/t plus probable and inferred ore.