TIDMBGL
RNS Number : 4495J
Bullabulling Gold Limited
12 June 2014
12 June 2014 ASX Code: BAB, AIM Code: BGL
METALLURGICAL RESULTS REINFORCE POTENTIAL FOR REAGENT COST
SAVINGS
Bullabulling Gold Limited is pleased to report that
metallurgical test-work results have been received that provide
further support for the potential to significantly reduce reagent
consumption at the proposed Bullabulling Gold Project.
-- Test results indicate nanofiltration could reduce lime consumption by up to 87.2%
-- Average cyanide consumption was 28.0% lower in nanofiltered water
-- Results support potential to achieve significant savings in operating costs
-- New diamond core is now available for gold recovery and variability test-work
Preliminary test-work on mineralised reverse circulation drill
samples from Bullabulling had indicated that nanofiltration of
process water could substantially reduce consumption of cyanide and
lime (see release of 12 March 2014).
A more comprehensive test-work program was subsequently
initiated to validate the initial nanofiltration results and
further optimise processing parameters. This work, which was
carried out on primary mineralised diamond core from a 2012
drilling program, has included a further 18 leach tests comparing
reagent consumption at various pH levels and cyanide concentrations
in nanofiltered water and raw bore water. The results of this
program have now been received and are consistent with the outcome
of the preliminary test-work.
The latest test-work has shown that using nanofiltration to
reduce magnesium levels in the process water, significantly reduces
the amount of lime required to achieve targeted pH levels in the
gold leaching circuit.
Tests were carried out in raw water at pH levels of 8.5 to 9.5,
with 1.53kg of lime required for each tonne of ore to achieve a pH
of 9.5. In nanofiltered water, pH levels of 9.5 to 10.5 were able
to be achieved with much lower lime addition. A pH of 9.5 was
maintained with lime consumption of only 0.20 kg/t, 87.2% less than
the lime consumed for a 9.5 pH in raw water.
Cyanide consumption is generally lower at elevated pH levels.
However tests at the common pH of 9.5 showed that cyanide
consumption was 16.5% lower in nanofiltered water than in raw water
at the same pH level. Average cyanide consumption in all
nanofiltration tests was 28.0% lower than in the raw water tests.
Lime and cyanide consumption rates over the range of pH levels
tested are presented graphically in Figure 1 (which can be seen in
the version of the announcement available on the Company's
website). It should be noted that these results are intended to
enable a comparison of reagent consumption in nanofiltered water
relative to raw bore water and final estimates of operational
consumption may vary from these numbers.
As previously reported, cyanide and lime are major components of
the estimated operating cost for the Bullabulling Gold Project.
Therefore a reduction in the consumption of these reagents of the
magnitude indicated by the test-work results has potential to
significantly reduce gold production costs.
An initial phase of flotation test-work has also been performed.
Flotation tests were carried out at grind sizes between 75um and
212um to determine whether there was potential to save energy costs
by concentrating the gold mineralisation at a coarse grind size and
or improve gold recovery through intensive grinding and leaching of
a low volume concentrate.
The Bullabulling mineralised samples responded well to
flotation, with 87% to 95% of sulphides reporting to a flotation
concentrate of less than 5% of initial sample mass, as shown in
Table 1. Most of the gold also reported to the flotation
concentrate, indicating that there may be scope to lift overall
gold recovery by subjecting the concentrate to fine grinding and
intensive leaching. However there was a material amount of gold
remaining in the flotation tail that is likely to require recovery
through conventional grinding and leaching. This suggests that the
potential to deliver major savings in energy costs through coarser
grinding is low.
The potential merits of implementing flotation as a means of
increasing gold recovery will be further evaluated.
Table 1: Summary of Flotation Results
------------------------------------------------------------------
Grind Size Concentrate Sulphur Recovery Gold in Concentrate
Mass
----------- ------------ ----------------- --------------------
212um 4.3% 87.0% 61.2%
----------- ------------ ----------------- --------------------
150um 4.2% 91.8% 65.6%
----------- ------------ ----------------- --------------------
106um 3.7% 94.6% 71.6%
----------- ------------ ----------------- --------------------
75um 3.6% 95.3% 74.3%
----------- ------------ ----------------- --------------------
The next phase of test-work will focus on establishing gold
recovery factors under the optimised process conditions and testing
the variability of metallurgical performance in different areas of
the deposit. This work will utilize new mineralised sample from a
diamond drilling program completed at Bullabulling in early May.
Logging and physical testing of the core from this program has been
completed, with the core now cut and dispatched for multi-element
analysis. Full assay results are expected by the end of this
month.
For information, contact:
Brett Lambert Westhouse Securities Limited
Bullabulling Gold Limited (UK Broker & Nominated Adviser)
Level 2, 55 Carrington Street Martin Davison / Hugo Rubinstein
Nedlands, WA, 6009, Australia Tel: +44 20 7601 6100
Tel: +61 8 9386 4086
------------------------------- -----------------------------------------------
Neil Boom John Gardner / Rupert Dearden
Gresham PR Ltd (UK media) MAGNUS Investor Relations. Corporate
Tel: +44 7866 805 108 Communication. (Australian Media)
Tel: +61 8 6160 4900
jgardner@magnus.net.au rdearden@magnus.net.au
------------------------------- -----------------------------------------------
About Bullabulling Gold Limited
Bullabulling Gold Limited is listed on the Australian Securities
Exchange (ASX:BAB) and London's AIM Market (AIM:BGL) and has
approximately 350 million shares on issue. The Company's primary
asset is the wholly owned Bullabulling Gold Project, located 60
kilometres west of Kalgoorlie in Western Australia.
The Bullabulling Gold Project hosts estimated Mineral Resources
of 3.75 million ounces comprising Indicated Resources of 72.4
million tonnes at 0.98 g/t gold (2.28 million ounces) and Inferred
Resources of 41.6 million tonnes at 1.11 g/t gold (1.47 million
ounces). Exploration has demonstrated strong potential for further
expansion of the resource base.
The Bullabulling deposit is amenable to bulk tonnage open pit
mining and conventional CIL processing. All resources are situated
on granted Mining Leases in close proximity to infrastructure.
The Company is conducting a definitive feasibility study into
the development of a large scale, low cost mining operation at
Bullabulling, scheduled for completion in Q1 2015.
Competent Person Statement
The information in this report that relates to the Exploration
Results, Mineral Resources or Ore Reserves is based upon, and
fairly represents, information and supporting documentation
compiled by Mr Trevor Pilcher, who is a full time employee of the
Company and is a member of The Australasian Institute of Mining and
Metallurgy. Mr Pilcher has sufficient experience relevant to the
style of mineralisation and type of deposit under consideration and
the activity in which he is undertaking to qualify as a Competent
Person under 2012 Edition of the Australasian Code for Reporting
Exploration Results, Mineral Resources and Ore Reserves (JORC
Code). Mr Pilcher consents to the inclusion in this report of the
matters based on his information in the form and context in which
it appears.
The information in this report that relates to the Exploration
Results, Mineral Resources or Ore Reserves was prepared and first
disclosed under the JORC Code 2004. It has not been updated since
to comply with the JORC Code 2012 on the basis that the information
has not materially changed since it was last reported.
This information is provided by RNS
The company news service from the London Stock Exchange
END
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