Bullabulling Gold Limited METALLURGICAL TEST-WORK PROGRAM EXPANDED (6261F)
28 4월 2014 - 3:01PM
UK Regulatory
TIDMBGL
RNS Number : 6261F
Bullabulling Gold Limited
28 April 2014
28 April 2014 ASX Code: BAB, AIM Code: BGL
METALLURGICAL TEST-WORK PROGRAM EXPANDED TO EVALUATE FURTHER
OPPORTUNITIES TO ENHANCE GOLD RECOVERY AND REDUCE OPERATING
COSTS
Bullabulling Gold Limited (the "Company") is pleased to provide
a progress report on the metallurgical test-work currently underway
as part of the Bullabulling Gold Project definitive feasibility
study (DFS).
-- Nanofiltration tests on Bullabulling bore water support earlier positive results
-- Potential identified to reduce energy costs and improve gold recovery through flotation
-- Current metallurgical program expanded to incorporate flotation test-work
-- DFS program extended to 1(st) quarter 2015 to accommodate the additional work
Preliminary test-work had demonstrated potential to
significantly reduce expenditure on processing reagents through the
removal of detrimental elements in the process water by
nanofiltration (see release of 12 March 2014). A broader test-work
program was subsequently initiated to validate the initial
nanofiltration results and further optimise other processing
parameters, including gravity concentration, leach residence time,
cyanide concentration and pH level.
Nanofiltration of a bulk water sample, derived from five
individual bores at Bullabulling, has now been completed producing
results that are consistent with the previous work. The filtered
water will be used for subsequent stages of the test-work
program.
Further test-work has also been carried out to assess pre-leach
gravity concentration. This work was performed using a bulk mineral
sample selected to be representative of primary ore to be processed
over the life of mine. Prior to commencing leach tests, the grade
of the bulk sample was checked with five assays returning values
ranging from 0.73g/t to 1.08g/t and averaging 0.92g/t, within 10%
of the projected life of mine average head grade.
Five leach tests were carried out on whole ore at various grind
sizes and residence times, with and without oxygen injection. Five
equivalent tests were also carried out following extraction of
gravity recoverable gold. Evaluation of the results supported the
prefeasibility study assessment that leaching of whole ore was
optimal. However calculated head grades from the ten leach tests
ranged from 1.11g/t to 1.53g/t and averaged 1.34g/t, 60% above
forecast mine head grade.
The reason for the grade significantly exceeding expectations
remains unclear. The bulk sample was composed of diamond drill core
sourced from ten holes drilled through mineralised lenses that
comprise approximately 90% of the Bullabulling resource and was
expected to represent typical Bullabulling mineralisation. Advice
from the Company's metallurgical consultant is that conclusions
drawn from the gravity test-work remain valid despite the grade of
the mineral sample varying from the forecast mine head grade.
Sulphur levels recorded during the comparative leach tests were
also above average at 0.8%, compared to typical levels of 0.2% to
0.6%. Sulphide levels are generally low at Bullabulling, however
the observance of sulphides is often an indicator of higher grade
gold, so the combination of high gold grades and higher sulphur
levels is not surprising. If a close association of gold with
sulphides can be confirmed, there may be opportunity to implement
flotation at a coarse grind size and subject the resulting
concentrate to a fine grind and intensive leach. Being able to
implement a coarse grind at Bullabulling would significantly reduce
energy consumption, the largest component of processing costs. Fine
grinding followed by intensive cyanidation of a low volume
concentrate has potential to improve gold recovery.
Flotation of Bullabulling ore has not previously been evaluated
as sulphide levels are lower than typically seen in flotation
plants. However recent examples have been cited of other gold
operations where ore of similar sulphur content has been
successfully treated by flotation.
In order to assess the performance of flotation on Bullabulling
mineralisation, the current metallurgical test-work program has
been expanded, with Bureau Veritas directed to conduct a series of
flotation tests. This work is currently underway with initial
results expected to be available by mid-May. Some further
mineralogical studies will also be carried out to improve
understanding of the gold/sulphide relationship and assess the
prevalence of gold encapsulation by sulphides to determine whether
this may impair gold recovery.
Other elements of the current metallurgical program have been
paused whilst the flotation work is carried out and the reason for
the high grade of the bulk sample is investigated. A new bulk
sample will be prepared for the next phase of leach test-work. The
DFS program has been extended to accommodate this work, with
completion now expected in the first quarter of 2015.
For information, contact:
Brett Lambert Westhouse Securities Limited
Bullabulling Gold Limited (UK Broker & Nominated Adviser)
Level 2, 55 Carrington Street Martin Davison / Dominic Palmer-Tomkinson
Nedlands, WA, 6009, Australia / Hugo Rubinstein
Tel: +61 8 9386 4086 Tel: +44 20 7601 6100
------------------------------- -----------------------------------------------
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 344 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 JORC compliant Mineral
Resources(3) 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
information 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. All material
assumptions and technical parameters underpinning the estimates of
mineral resources continue to apply and have not materially
changed.
This information is provided by RNS
The company news service from the London Stock Exchange
END
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