Tritton Budgerygar Corridor
The Tritton-Budgerygar corridor is a highly-prospective copper rich mineralised system, located approximately 600m along strike to the north of the Tritton deposit and contains an inferred Mineral Resource of 1.60Mt @1.5% Cu.
Within the larger 2,000m (horizontal) Tritton – Budgerygar mineralised corridor there are numerous drill hole intersections peripheral to both deposits which contain elevated (+0.5% Cu) intersections over multiple metres. The South and North Wings are two examples of sparsely defined sulphide (pyrite-chalcopyrite) lenses located along strike from the main Tritton orebody.
At South Wing, historical drilling has defined multiple sulphide (pyrite-chalcopyrite) lenses over a 250 metre vertical extent from 4,500mRL to 4,250mRL. During the year, a six hole diamond drill campaign was completed from the 4285 level targeting the lower limits of the modelled South Wing. Five drill holes intersected pyrite-chalcopyrite mineralisation with the most significant intersections noted below:
• TRGC943 13.6m at 1.6% copper including 4m at 2.6% copper
• TRGC945 18.9m at 1.3% copper including 4.9m at 2.8% copper
The North Wing sulphide occurrence is defined by three historical drill holes which intersected a pyrite-chalcopyrite sulphide horizon along strike (north) and possibly in the hanging wall of the Tritton deposit. Geological understanding of the North Wing is limited, and a six-hole diamond drill campaign was completed during the year testing mineralisation continuity surrounding the historical drill holes. Results from the drill program surpassed expectations with three drill holes returning thick (+30 metres) intersections of massive and semi-massive pyrite dominate with lesser chalcopyrite sulphide packages. Assay results returned included:
• TRGC949 30.1m at 0.7% copper including 6.1m at 1.3% copper
• TRGC950 38.15m at 0.7% copper including 7.7m at 1.3% copper and 4.1m at 1.3% copper
The results from South Wing and North Wing are encouraging and indicate the Tritton – Budgerygar mineralised corridor is highly prospective with significant potential to define new mineralised horizons within the two kilometre corridor.
At the Tritton deposit four drill holes were completed during the year targeting down dip extensions to the main Tritton orebody below the 4,000mRL level. Each drill hole intersected copper mineralisation down to the 3,860mRL level. The results are also highly encouraging indicating the Tritton mineralised system continues at depth. The deposit has now been traced over 2 kilometres down dip and remains open down-dip. Assays results returned include:
• TRGC956 41.8m at 1.9% copper including 12.9m at 4.1% copper
• TRGC957 50.5m at 1.4% copper
Further drilling is planned within the Tritton – Budgerygar corridor in 2019, focused on increasing the Mineral Resource base at the Tritton deposit and surrounding mineralisation extensions.
Long section view of the Tritton and Budgerygar modelled copper deposits.
Murrawombie Mine Extension
There are good opportunities to extend the Murrawombie mine. The current mine design stops at the limit of the Indicated Mineral Resource, where drill hole information becomes sparse. Extension drilling of the Murrawombie deposit from the surface is constrained by the location of the heap leach pads. When the access decline is sufficiently advanced late in FY2019, the design of an extension drilling program from a suitable underground location will be undertaken.
Avoca Tank Deposit Extension
Tritton region deposits typically have a long down plunge extent and the same is expected to be true at Avoca Tank. Future exploration drilling of the deposit will be most efficient from an underground platform, and further significant drilling of the deposit will therefore be carried out following the mine development. However, to assist with feasibility studies a small program of up to three exploration drill holes to test the vertical extension of the deposit is planned. This program has the aim of helping to improve the understanding of the deposit’s structural controls to optimise the underground drilling location.