Resource definition aims to locate additional gold resources near to the existing known resources of the mine. These are typically below, or extensions of the existing lode systems within mining leases owned by KCGM.

Data is obtained through drilling. Typically two types of drill rigs are used:

• Reverse Circulation (RC) percussion drills, and
• Diamond drills.

RC drills pulverise the rock and force the samples through the drill rods using high-pressure air. Pulverised rock is retained in a dust collector where the sample is subdivided. The subdivided samples are then sent to a laboratory for gold and sulphur analysis. Another set of rock chips are tested by the Geologist for rock type, alteration, and structure.

Diamond core is also logged by the geologist. Core is cut in half (long ways) using a diamond saw. The half core is then bagged into composites and sent to the laboratory for analysis

All this data is then used to generate a computer model of the gold variation, rock types and structures that contain the gold.

By using computer generated models, potential targets are found by determining areas that have a high probability of containing ore grade rocks, but at the same time have a low confidence due to insufficient data (insufficient drill holes) ie the presence of ore has not been proved.

Once drilling in an area is complete the geological model is re-evaluated. The evaluation re-determines the grade, tonnes and confidence of the area. Estimations are made using complex computer algorithms that search for drilling data within the generated model and estimate grades for ore blocks based on geological assumptions programmed into the algorithm.

Cross Section (Looking North) through Model showing estimated blocks, lode systems and Drillholes.