ABx refers to such high grade bauxite as "Brown Sugar" which commands a large price premium.
The deposit lies at surface, commonly on topographic high points which have been cleared for grazing but left uncultivated because of the poor soil that develops on bauxite.
The bauxite is relatively consistent in quality as demonstrated by the fact that 87% of the 71 bauxite intercepts are "Brown Sugar" bauxite, being a superior quality, low silica, gibbsite bauxite suitable for sweetening circuits in refineries.
Logistical Setting and Relationship with Inverell Bauxite Project
The Guyra bauxite is adjacent the standard gauge rail line connecting Guyra to Armidale, Werris Creek and thence to the heavy-duty rail to Newcastle minerals export port. Operations of the Guyra-Armidale rail leg has recently been decommissioned after being used for logging transport.
Guyra is located near the company's Inverell and Pindaroi bauxite deposits and may provide sufficient tonnages to justify a major bauxite project in northern NSW.
Review of Environmental Factors
A Review of Environmental Factors (REF) has been approved by the Department of Industry and Investment so that more intensive exploration drilling can be undertaken.
Further Work Planned
The bauxite deposit is open in many locations and many other deposits have been identified. Followup drilling of the Guyra discovery is being scheduled over the coming months in line with the REF.
New Exploration Lease Application
The bauxite deposit is concealed beneath a shallow surface clay layer but the company's exploration technology indicates that this high quality bauxite layer extends over a considerable distance. A new exploration lease application has been made to secure the extension areas for ABx. Once approved, exploration drilling will accelerate in the Guyra district.
RESOURCE ESTIMATE METHOD
During reconnaissance exploration drilling on a semi-random pattern governed by site availability across Guyra EL 7361 to test several of the many bauxite targets; 71 holes intersected a consistently good quality bauxite layer concealed beneath a surface clay layer.
Drill samples were collected at 1 metre intervals from the aircore drillholes and analysed at ALS Laboratories in Brisbane including trihydrate (THA) available alumina ("Al2O3 Avl") and reactive silica ("Rx SiO2") measurements. Leach conditions to measure available alumina "Al2O3 Avl" and reactive silica "Rx SiO2" were 1g leached in 10ml of 90gpl NaOH at 143 degrees C for 30 minutes.
Estimation was done by geostatistical block modelling of bauxite intercepts, constrained within geological boundaries using Gemcom resource estimation software. The drill spacing within the bauxite zones was typically at 100 metres spacings but data interpolation of up to 340 metres was done to ensure that all 25m x 25m blocks were estimated. Blocks with less than 3 datapoints were excluded from this maiden estimate - these will be targets for later infill drilling.
Bauxite density was conservatively assumed at 1.8 dry tonnes per cubic metre in situ.
GROWTH IN TOTAL BAUXITE RESOURCE OVER TIME
In the 19 months since listing on 24 December 2009, Australian Bauxite Limited has discovered drilled and declared bauxite resources totalling 68 million tonnes 1,2, mainly of high-quality, low silica gibbsite rich bauxite. The resource growth shows no sign of slowing across the 37 tenements in QLD, NSW & Tasmania.
For the complete Australian Bauxite announcement including figures, please view:
About Australian Bauxite Limited
Australian Bauxite Limited (ABx) (ASX:ABX) has started its first bauxite mine in Tasmania and holds the core of the Eastern Australian Bauxite Province. ABx’s 37 bauxite tenements in Queensland, New South Wales & Tasmania exceed 5,000 km2 and were rigorously selected for (1) good quality bauxite; (2) near infrastructure connected to export ports; & (3) free of socio-environmental constraints. All tenements are 100% owned, unencumbered & free of third-party royalties.
ABx’s discovery rate is increasing as knowledge, technology & expertise grows.
The Company’s bauxite is high quality gibbsite trihydrate (THA) bauxite & can be processed into alumina at low temperature.
ABx has declared large Mineral Resources at Inverell & Guyra in northern NSW, Taralga in southern NSW, Binjour in central QLD & in Tasmania confirming that ABx has discovered significant bauxite deposits including some of outstandingly high quality.
In Tasmania, at Bald Hill, the Company’s first bauxite mine commenced operations on schedule on 9 December 2014 – the first new Australian bauxite mine for more than 35 years.
ABx aspires to identify large bauxite resources in the Eastern Australian Bauxite Province, which is emerging as a globally significant bauxite province. ABx has created significant bauxite developments in 3 states - Queensland, New South Wales and Tasmania. Its bauxite deposits are favourably located for direct shipping of bauxite to both local and export customers.
ABx endorses best practices on agricultural land, strives to leave land and environment better than we find it. We only operate where welcomed.
Australian Bauxite Limited