North Queensland Operations includes three deposits, Mt Colin, Barbara and Lillymay. The deposit is considered an ISCG (iron sulphide copper gold) classification. Mt Colin The deposit strikes approximately 295o (MGA), and dips approximately 75o NNE. It is hosted by metasomatised calc-silicates of the Corella Formation (1750-1738Ma), at surface, and by the Wonga-suite Burstall Granite (1745-1726Ma) at depth. Mineralisation principally controlled and essentially contained within the WNW-ESE striking planar Mt Colin fault. The broad-scale geology appears relatively simple and straightforward. The mineralised zone is dominated by pyrrhotite gangue to the east, and carbonate dominated gangue to the west. Known extent of +1.5% Cu mineralisation is approximately 400m in strike length, 500m down-dip, and up to ~10m in true width. The Mineral Resource extends to these limits. Barbara The deposit can be broken into main areas North, Central and South. Southern Lode of Barbara mineralization (+0.5% Cu) extends for approximately 230m in strike length (local N-S), averaging approximately 15m in true width (between 1m to >25m). As modelled it extends at least 580m down-plunge (550m below surface). The Mid and Northern Lodes average 3-5m in width over a combined strike length of 400m and to 180m below surface. Lillymay The Inferred Resource outcrops at surface and has been defined over a strike length of 400m, and down-dip for 140m. The larger E Lode is approximately 250m in strike ........

A mining method at Mt Colin review and redesign of the LOM was completed in June 2022. This included development design, stope access and mining method application.

Mine type: Underground long hole open stoping

The mining method at Mt Colin is a combination of centre out bench and fill stoping and Avoca bench stoping, using alternating accesses. The mining methods have not changed since the previous estimate.

Sub level intervals are 20m above 1300 Level and 25m below 1300 Level at Mount Colin. This is based on appropriate method for control of dilution, reduction of pillars and ore loss, ground control, safety and regional stability.

A minimum stoping width of 3m has been used.

Practical designs have been included for ventilation, power, pumping and drainage as well as second means of egress.

The majority of the stopes will be filled using rock fill to improve stope stability and increase ore recovery.

The Barbara project is a former open-cut copper and gold mine. The site operated from 2019 to 2020 before being placed into care and maintenance. A significant copper-gold resource remains below the pit.

- subscription is required.