Overview

Mine Type	Open Pit
Stage	Permitting
Commodities	Copper Gold Cobalt
Mining Method	Truck & Shovel / Loader
Mine Life	...
Snapshot	Kalkaroo is one of the largest undeveloped open pit copper deposits in Australia on a 0.89% CuEq Ore Reserve basis. Contains 1.1 million tonnes of copper, 3.1 million ounces of gold and 23,200 tonnes of cobalt in Measured, Indicated and Inferred JORC Mineral Resources.

Deposit type

• Stratabound
• Vein / narrow vein

Summary:

Kalkaroo consists of stratabound replacement and vein style copper-gold mineralisation within Willyama Supergroup rocks of the Curnamona Craton.

The stratabound mineralization is uniformly distributed along more than 3 km of strike that follows an arc around the 35 degree dipping northern nose of the Kalkaroo south dome. It is hosted by an 80m -120m thick mineralised horizon that is sandwiched between psammitic footwall rocks and a thick pelitic hangingwall sequence.

In part, the mineralization is associated with near-vertical, mineralised quartz vein breccia fracture/fault fillings, which probably formed channel ways for the mineralising fluids. Interference folding resulted in dome structures which probably acted as structural traps for the rising mineralising fluids carried by these vertical structures.

The mineralising events were associated with iron-rich and sodium-rich alteration fronts, which are manifest as widespread fine-grained magnetite in the lower sandy formations and as pervasive albite alteration.

Erosion in the Mesozoic and Tertiary period exposed the Kalkaroo deposit to prolonged and deep weathering. Consequently, the deposit shows typical supergene enrichment features in its upper part, caused by oxidation of the primary sulphides in the weathering zone, forming a soft clay rich rock called saprolite. This is manifest in a subhorizontal stratification of the ore minerals from top to bottom:

1. Supergene free gold in saprolite, with generally minor copper, recoverable by gravity and cyanide leaching methods.

2. Native copper and gold in saprolite, largely recoverable by gravity methods.

3. Chalcocite dominant with gold, recoverable by conventional flotation.

4. Chalcopyrite dominant with gold and locally rich molybdenum, recoverable by conventional flotation.

The Kalkaroo mineralisation exists around an arcuate domal structure which has been drilled more than 3km along strike. Copper-gold mineralisation is continuous throughout this strike length and is open at depth along its entire length and is open at both ends.

The true width of mineralisation ranges from 40-80 metres thick, while the plan width of mineralisation above cutoff varies from 50 to 200 metres.

Mineralisation generally has an upper bound 50 metres below the topography and at its deepest has been intersected in a single drillhole 500 metres below the topographic surface.

Mining Methods

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Comminution

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Job Title	Name	Phone	Email	Profile	Ref. Date
.......................	.......................	...........	...........		Jan 10, 2024