TIDMAGLD
RNS Number : 6722I
Allied Gold Limited
17 June 2011
THE INFORMATION CONTAINED HEREIN IS RESTRICTED AND IS NOT FOR
PUBLICATION, RELEASE OR DISTRIBUTION, DIRECTLY OR INDIRECTLY, IN OR
INTO THE UNITED STATES OR ANY JURISDICTION IN WHICH SUCH
PUBLICATION RELEASE OR DISTRIBUTION WOULD BE UNLAWFUL
17 June 2011
Allied Gold Limited
("Allied Gold" or the "Company")
PUBLICATION OF PROSPECTUS IN CONNECTION WITH PROPOSED MOVE FROM
AIM TO THE PREMIUM LISTING SEGMENT OF THE OFFICIAL LIST
Allied Gold is pleased to announce the publication of a
prospectus ("Prospectus") in connection with the proposed admission
to the premium listing segment of the Official List of the UK
Listing Authority ("Official List") and to trading on the London
Stock Exchange plc's main market for listed securities ("Main
Market") of the shares of Allied Gold Mining PLC (the successor
company under the proposed schemes of arrangement ("Schemes")).
Admission of the shares of Allied Gold Mining PLC to the
Official List and to trading on the Main Market and cancellation of
admission to trading on AIM of the shares of Allied Gold is
expected to occur simultaneously on Thursday, 30 June 2011, at 8:00
am, provided that the Schemes are approved by the Supreme Court of
Queensland at the court hearing to be held on Monday, 20 June
2011.
Certain information relating to the Company that is included in
the Prospectus is summarised in the Appendix to this announcement.
Capitalised terms used in the Appendix and not otherwise defined
have the meanings ascribed to them in the Prospectus.
A copy of the Prospectus has been submitted to the National
Storage Mechanism and will shortly be available for inspection on
the Company's website at: http://www.alliedgold.com.au/.
For further information please contact:
Allied Gold Limited
Australia - Simon Jemison - Investor and Media
+61-418-853-922
Canada - Rebecca Greco - Investor Relations +1 416-839-8610
London - David Simonson - C/. MerlinPR + 44(0) 20 7726 8400
Beaumont Cornish Limited (Allied Gold's nominated adviser)
Roland Cornish - +44 (0) 207 628 3396
RBC Capital Markets (Allied Gold's sponsor)
+44 (0) 207 653 4000
Stephen Foss
Matthew Coakes
Daniel Conti
APPENDIX
SUMMARY OF CERTAIN INFORMATION INCLUDED IN THE PROPSECTUS
PART 1 - INFORMATION ON THE GROUP
Paragraph 9 - Strategy
The Group's core strategy is to achieve profitable growth and
increase volume from current mining assets. The Group anticipates
that this will be achieved through a combination of organic growth
through its existing Melanesian assets and through the acquisition
of additional assets, including assets located in other regions.
The Group continually reviews and assesses potential acquisitions
throughout the world. The central driver of this strategy is
securing the Group's future production, which it intends to achieve
through the development and expansion of existing mining
assets.
The Group is currently forecasting gold production at a run rate
of in excess of 200,000ozpa from its combined Simberi and Gold
Ridge operations. Now that gold production at Gold Ridge has
commenced, the Group can also look to harness the potential of the
under-explored region around Simberi. There is significant further
potential to increase production at Simberi through expansion of
the oxide processing plant and developing a processing plant for
the sulphide resources.
The Group's aim is to keep growing its critical mass in terms of
resources, reserves and production capacity through exploration.
The Group is investing in excess of A$10 million annually into
exploration, with programmes around all of its producing assets and
at greenfield projects in PNG and the Solomon Islands, as the
Directors seek to build on the position of the Group as a prominent
gold producer and explorer in the region.
The Group is also focused on the organic development of in-house
projects and regional acquisitions of production or near-term
production assets.
Simberi 2010-2011
The Group's strategy is to add to the gold inventory on Simberi
Island by defining additional resources and converting these and
other known resources into reserves with a view to expanding
annualised gold production.
Plans are now underway to incrementally expand the Simberi oxide
circuit to produce 100Koz per annum by the end of December 2011.
This will be by way of an increase in the nameplate capacity of the
plant from 2.4Mtpa to 3.5Mtpa to take advantage of the increasing
oxide reserve and resource base.
Whilst the Directors believe that the Group has sufficient
oxides for the next decade, opportunities remain to lift both the
oxide and sulphide inventory. In the year ahead, the Group will
target pit edge oxides at the Sorowar deposit. The Group will also
target underlying sulphide mineralisation at Pigiput, Pigibo and
Sorowar as well as testing the possible link between the Samat
North and Samat East deposits. A decision on the sulphide
development is expected in 2012 after the completion of further
exploration drilling and a BFS on the sulphide reserves at
Simberi.
The Group has budgeted A$8 million for the year to December 2011
to undertake 20,000m of diamond core and 40,000m of RC drilling at
Simberi.
Gold Ridge 2010-2011
Production commenced at Gold Ridge in March 2011. The Group is
targeting an increase of throughput to 2.5Mtpa producing on average
120Koz per annum of gold for the first three years of operation. A
review of a possible further increase in throughput will be ongoing
as more exploration data progressively becomes available, although
such an increase would not be likely to affect the initial
development throughput design.
The Group plans to commit approximately A$5 million to near-mine
and regional exploration activity. Drilling with a Group-owned
reverse circulation rig commenced in July 2010 at Namachamata. An
extensive IP geophysical survey, covering all the known deposits
and their possible extensions and parallel zones, is also underway.
Preliminary results indicate the known deposits respond to the
geophysical survey offering the potential for new discoveries.
The Directors believe that the region has great exploration
potential, and the Group has applied for a significant regional
exploration tenement package of 129km(2) in readiness for future
aggressive exploration campaigns.
With Gold Ridge in operation, total Group gold production is
currently projected to run at over 200Koz per annum and group
operating cash flow at approximately US$100 million per annum. This
will help support further growth initiatives and exploration
activity in PNG and the Solomon Islands, where operations have lain
dormant for almost a decade.
Tabar and Tatau exploration
Tatau is the closest island to Simberi, some 20km away. Work by
Kennecott in the 1970s produced encouraging results. The Group now
plans to apply modern exploration methods to the area.
A number of areas have been highlighted for exploration in 2011
including Mount Letam, Mount Tiro, Siro, Pepewo and Talik. At Mount
Letam, drilling commenced in Q4 2010.
Big Tabar Island gives its name to the chain of islands which
include Tatau, Mapua and Simberi. During its 21 month tenure as JV
manager, Barrick drilled ten diamond core holes at the Tupinda and
Banesa prospects. Potentially economic grades of alkaline porphyry
style copper gold mineralisation were encountered. However, the
Banesa prospect remains under-explored and an IP geophysical survey
is planned to help determine the next round of targets.
PART IX - HISTORICAL FINANCIAL INFORMATION
SECTION B - FINANCIAL STATEMENTS FOR SIX MONTHS ENDED 31
DECEMBER 2010
The Prospectus contains an audited half-year financial report of
Allied Gold Limited, which comprises the consolidated statement of
financial position as at 30 June 2010, 2009, and 2008, the
consolidated statement of comprehensive income, the consolidated
statement of changes in equity and the consolidated statement of
cash flows for the years then ended on those dates, notes
comprising a summary of significant accounting policies and other
explanatory information, and the directors' declaration of the
consolidated entity comprising the disclosing entity and the
entities it controlled at the year's end or from time to time
during the financial years.
The financial information in the Prospectus has been prepared in
accordance with International Financial Reporting Standards as
adopted by the European Union. The financial statements previously
disclosed to the market through the Company's audited interim
financial statements (dated 11 February 2011) and Scheme booklet
(dated 28 April 2011) were prepared in accordance with the
Australian equivalents to International Financial Reporting
Standards. The change has not resulted in any change to the
reported Profit/(Loss) after Tax or Net Asset position of the group
for any of the reported periods.
PART XIV - COMPETENT PERSON'S REPORTS
SECTION A - SUMMARY
2.0 Summary - Simberi Project
2.1 Scope
This section is a summary of the Simberi Gold Project CPR which
has been prepared separately (set out in Section B of Part XIV of
the Prospectus).
2.2 Property Description
The Simberi Gold Project is located on Simberi Island in the
Tabar Islands Group. The Tabar Islands are situated in the New
Ireland Province of Papua New Guinea (PNG) at approximately
latitude 2.5[deg] South and longitude 152[deg] East. The four
sparsely inhabited islands of the Tabar Group are located 130 km
east of the capital city of New Ireland Province, Kavieng. The
Simberi Gold Project is located within Mining Lease ML136 which
covers the eastern half of Simberi Island.
2.3 Ownership
Simberi Gold Company Ltd ("Simberi Gold"), a fully owned
subsidiary of Allied Gold Pty Ltd ("Allied") operates the Simberi
Gold Mine on Simberi Island.
2.4 Geology
Simberi Island is the oldest and northernmost island of the
Tabar Island group. It forms part of a silica-poor, potassium-rich
alkaline volcanic Pliocene-Pleistocene island arc to the immediate
north of New Ireland, PNG.
The currently known gold prospects on Simberi Island are located
in the eastern half of the island, within the central volcanic core
and are contained within a sub-cropping epithermal alteration
system extending 4 km north-south and 2 km east-west. The host
rocks for the mineralisation comprise altered andesitic lava flows
or intrusives (porphyries), volcanoclastics and tuffs.
Gold mineralisation, however, does not appear to be closely
associated with any particular lithology. Where recognised, the
main primary control of gold mineralisation is steeply dipping
fracture systems, in places associated with milled breccia dykes
(diatremes). Particularly high grades are associated with
diatreme-country rock contact zones. Gold mineralisation is
generally associated with sulphides or iron oxides occurring within
all variety of hydraulic fractures, such as simple fracture
infills, single vein coatings and crackle brecciation in the more
competent andesite units and broad disseminations in the naturally
porous volcanoclastic rocks.
In the Oxidised zone, the gold is predominantly associated with
iron oxides after sulphides, with higher
grades occurring with rare vuggy and chalcedonic quartz.
The Sulphide zone mineralisation includes refractory gold hosted
by pyrite or marcasite and scarcer arsenopyrite at depth. Trace
element analyses indicate the pyrite is arsenian.
2.5 Exploration
The Tabar Island Group has been extensively explored by a number
of operators since the discovery of in situ gold in 1981.
Exploration in ML 136 is focussed around the identified deposits of
Sorowar, Pigiput, Pigibo, Botlu, Pigicow, Bekou and Samat. In
addition to these, there are a number of smaller prospects yet to
be properly defined. Exploration uses a combination of channel
sampling, reverse circulation and diamond core drilling.
In addition to ML 136, Allied also hold Exploration Lease 609
covering most of the rest of the Tabar Island Group. EL 609 is also
being actively explored.
2.6 Mineral Resources
Table 2-1 summarises the Mineral Resources for the Simberi
deposits.
Table 2-1: Simberi Resource (0.5 g/t Au cut off-depleted to 1
January 2011)
Deposit Material Measured Indicated Inferred
------------------- -------------------- --------------------
Au Au Au
Mt g/t koz Mt g/t koz Mt g/t koz
Bekou .
. . . .
.......
. Oxide 0.04 1.74 2 0.06 1.14 2
Transition 0.01 1.17 0 0.05 1.16 2
Sulphide 0.02 1.93 2 0.92 1.38 41
Bekou Total
. ...... 0.07 1.71 4 1.03 1.36 45
Botlu .
. . . .
.
.......
. Oxide 1.22 1.14 44 0.45 1.23 18 0.31 1.16 11
Transition
Sulphide 1.45 1.81 84
Botlu Total
. . ...... 1.22 1.14 44 0.45 1.23 18 1.76 1.70 95
Pigibo .
. . . .
.
...... Oxide 2.96 1.11 106 0.6 0.89 17
Transition 2.19 1.19 84 0.51 0.92 15
Sulphide 3.86 1.11 137 6.22 0.94 188
Pigibo Total
. ...... 9.01 1.13 327 7.33 0.93 220
Pigicow
. . . .
.
..... Oxide 0.15 1.65 8 0.29 1.3 12
Transition 0.11 1.29 4
Sulphide 2 1.26 81
Pigicow Total
...... 0.15 1.65 8 2.4 1.27 97
Pigiput
. . . .
.
....... Oxide 2.89 0.86 80 4.6 0.92 137 2.01 0.79 51
Transition 1.95 0.89 56 0.77 0.83 21
Sulphide 32.56 1.51 1583 32.25 1 1042
Pigiput Total
. ...... 2.89 0.86 80 39.11 1.41 1776 35.03 0.98 1114
Samat
East .
.
...... Oxide 0.4 1.13 14
Transition 0.08 0.78 2
Sulphide 3.5 0.78 88
Samat East
Total . 3.98 0.82 104
Samat
North A
.... Oxide 0.11 0.78 3 0.11 0.84 3
Transition 0.04 1.29 2 0.01 1.26 0
Sulphide 0.36 0.81 9 1.08 0.86 30
Samat North
A Total .
. . . ............ 0.51 0.84 14 1.2 0.86 33
Samat
North B
.... Oxide 0.12 0.86 3 0.12 0.75 3
Transition 0.05 2.86 5 0.02 0.78 1
Sulphide 1.9 1.22 74 1.05 0.73 25
Samat North
B Total .
. ............... 2.07 1.24 82 1.19 0.73 29
Samat
South A
. . . Oxide 0.02 1.96 1 0.16 1.28 7
Transition 0.01 0.98 0 0.01 0.77 0
Sulphide 0.02 1.01 1 1.73 0.97 54
Samat South
A Total .
. . 0.05 1.38 2 1.9 1.00 61
Samat
South B
. . . Oxide 0.05 2.94 5 0.17 1.51 8
Transition 0.05 2.03 3 0.02 0.99 1
Sulphide 1.7 1.76 96 3.36 1.07 115
Samat South
B Total .
. .............. 1.8 1.80 104 3.55 1.09 124
Sorowar
. . . .
.
..... Oxide 5.61 1.3 235 8.56 1.08 298 2.4 1.09 84
Transition 0.54 1.17 20 1.46 1.14 53 0.29 0.83 8
Sulphide 1.3 0.93 39 6.93 0.92 205 19.03 0.9 549
Sorowar Total
...... 7.45 1.23 294 16.95 1.02 556 21.72 0.92 641
Sorowar
South
.... Oxide 0.68 0.82 18
Transition 0.28 0.68 6
Sulphide 5.39 0.66 114
Sorowar South
Total . .
. . . . .
...... 6.35 0.68 138
Grand Total
. . .... 11.56 1.13 418 70.17 1.28 2891 87.44 0.96 2701
2.7 Mineral Reserves
Table 2-2 summarises the Mineral Reserves and Resources within
designed pits for the Simberi deposits.
Table 2-2: Simberi Mineral Reserves and Resources within Design
Pits (1 January 2011)
Proven Probable Total Ore
------------------- --------------------- --------------------
Au Au Au
Pit Mt g/t koz Mt g/t koz Mt g/t koz
Sorowar
Oxide . . .
. . . . .
. ....... 6.03 1.23 238 5.40 1.18 205 11.43 1.21 433
Transition
. . . . .
......... 0.55 1.08 19 0.52 1.29 22 1.07 1.18 41
Sulphide .
. . . . .
......... 0.38 1.10 13 0.74 1.49 35 1.12 1.36 49
Sorowar
Total . .
....... 6.96 1.21 271 6.66 1.22 262 13.62 1.22 533
Pigiput
Oxide . . .
. . . . .
. ....... 3.94 0.73 92 5.35 0.82 141 9.42 0.78 233
Transition
. . . . .
........ 1.67 0.86 46 1.67 0.86 46
Sulphide .
. . . . .
........ 12.51 2.39 961 12.51 2.39 961
Pigiput
Total . .
. ...... 3.94 0.73 92 19.53 1.83 1148 23.47 1.64 1241
Pigibo
Oxide . . .
. . . . .
. ....... 3.43 1.00 110 3.43 1.00 110
Transition
. . . . .
........ 1.65 1.21 64 1.65 1.21 64
Sulphide .
. . . . .
........ 0.43 2.04 28 0.43 2.04 28
Pigibo
Total . .
. .
...... 5.51 1.14 203 5.51 1.14 203
Samat North
A
Oxide . . .
. . . . .
. ....... 0.07 0.70 2 0.07 0.70 2
Transition
. . . . .
........
Sulphide .
. . . . .
.......
Samat North
A Total . 0.07 0.70 2 0.07 0.70 2
Samat North
B
Oxide . . .
. . . . .
. ....... 0.12 0.79 3 0.12 0.79 3
Transition
. . . . .
......... 0.05 3.61 6 0.05 3.61 6
Sulphide .
. . . . .
......... 0.33 2.28 24 0.33 2.28 24
Samat North
B Total . 0.50 2.06 33 0.50 2.06 33
Samat South
Oxide . . .
. . . . .
. ....... 0.08 2.37 6 0.08 2.37 6
Transition
. . . . .
......... 0.05 2.16 3 0.05 2.16 3
Sulphide .
. . . . .
........ 0.68 2.43 53 0.68 2.43 53
Samat South
Total . . 0.81 2.41 62 0.81 2.41 62
Botlu South
Oxide . . .
. . . . .
. ....... 0.74 1.35 32 0.12 1.61 6 0.86 1.39 38
Transition
. . . . .
.........
Sulphide .
. . . . .
........
Botlu South
Total . .
. 0.74 1.35 32 0.12 1.61 6 0.86 1.39 38
Total All
Pits
Oxide . . .
. . . . .
. ....... 10.71 1.05 363 14.57 1.01 473 25.28 1.03 836
Transition
. . . . .
........ 0.55 1.08 19 3.94 1.11 141 4.49 1.11 160
Sulphide .
. . . . .
........ 0.38 1.10 13 14.69 2.33 1102 15.07 2.30 1116
Total All
Pits . . .
...... 11.64 1.06 395 33.20 1.61 1716 44.84 1.46 2112
2.8 Mining
The current mine plan consists of the open pit mining of oxide
deposits. The Samat oxide pits have been largely depleted. Ore is
currently being extracted from the Sorowar pit.
The Simberi mining operation is a conventional load and haul
operation using a mixed fleet of owner and contractor equipment
(Table 2-3). Ore from the Sorowar pit is transported to the
processing plant by an aerial conveying system. Currently, just
over 100,000 t of ore per month is being mined.
Table 2-3: Simberi Gold Company (SGC) Mining Fleet
Machine Number
Cat 740 articulated truck . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . .................. 8
Cat 725 articulated truck . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . ................. 2
Cat 330 excavator . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . ................. 2
Komatsu PC450 LC-7 excavator . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . .
. . . .................. 2
Cat D10N dozer . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . ................... 1
Cat D9N dozer . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . .................. 1
Cat D6R dozer . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . .................. 3
Cat 140 grader . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . ................. 1
Cat CS-563E roller . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . ............... 1
Cat IT38G . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................. 1
Cat 980G FEL . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . .................. 2
2.9 Processing
The current oxide plant is treating greater than 2 Mtpa at a
recovery of greater than 92% gold.
Expansion of the oxide plant is based on providing increased
comminution capacity including a SAG mill, and increased leaching
and carbon adsorption capacity. Capital cost is estimated at A$32 M
for the oxide expansion project.
Metallurgical testwork has aimed at developing a viable
flotation, roast, leach flowsheet for the sulphide ore. A
preliminary process design has been developed. Preliminary
engineering at PFS level has resulted in a capital cost estimate of
$188 M for the sulphide plant, and a further $7.6 M for
infrastructure associated with the use of Heavy Fuel Oil (HFO) for
power supply.
A project to expand of the oxide processing plant capacity to
3.5 Mtpa is currently underway and a Bankable Feasibility Study is
currently being conducted to consider a proposed development of a
1.5 Mtpa sulphide processing facility on Simberi Island to
facilitate treatment and recovery of gold from sulphide ore.
Operating cost for the expanded oxide plant is estimated at
$9.25/t ore milled. This is based on the current operating cost
adjusted for increased throughput. Operating cost for the sulphide
plant has been estimated from first principles at $23.29/t.
NPV of the combined expanded 3.5Mtpa oxide and 1.5Mtpa sulphide
project has been calculated at $334 M. This includes the
contribution of the existing oxide project. Cash operating costs
are $678/oz.
All dollars are in Australian Dollars (A$) unless otherwise
denoted.
2.10 Authors' Conclusions
2.10.1 Mineral Resources
-- The Simberi resource is a robust and proven gold deposit.
-- The current resource models show a positive reconciliation in
the mined pits. This issue should be investigated with the
objective of optimising production and potentially increasing the
mine life.
-- The historical resource at Botlu is accepted as Inferred
based on the Author's validations. The resource models should be
re-estimated using the current data set and understanding of the
deposits' geology.
-- The Sulphide resource at Sorowar needs to be drilled and
assessed.
-- Beyond the Simberi mining lease, the exploration ground held
by Allied over the Island group is all very prospective.
2.10.2 Mineral Reserves
-- The reserves at Simberi, being based on the resource are also
proven and robust.
-- Improvements to the reserve position come directly from
improvements and increases in the resource.
-- The development of some of the satellite deposits will add to
the reserve base.
-- Inclusion of more Sulphide material has the potential to
significantly increase reserves.
2.10.3 Processing
-- The current oxide processing plant is operating well and
achieving good oxide recoveries.
-- The infrastructure that is in place at Simberi Gold is
adequate for the 2 Mtpa operation, and with some upgrading
including the wharf facility, will be adequate for the 3.5 Mtpa
oxide operation and 1.5 Mtpa sulphide operation.
-- The author is of the opinion that the proposed oxide plant
expansion modifications and additions will be effective in
increasing oxide plant throughput to 3.5 Mtpa.
-- The capital cost estimate of $32 M for the oxide plant
expansion to 3.5 Mtpa is reasonable for the modifications and
additions proposed.
-- The capital estimate of $188 M for the 1.5 Mtpa sulphide
plant design and construction is reasonable.
-- The gold grades to be fed to the oxide process plant are low
at 1.1 g/t average over the mine life, and maintaining low overhead
and operating costs will be critical to project viability.
-- The combined 3.5 Mtpa oxide project and 1.5 Mtpa sulphide
project is commercially viable with NPV of $334 M (at 10% discount
factor) pre-tax, using US$1,000/oz gold price and A$:US$ exchange
rate of 0.8. The NPV is sensitive to gold price.
2.11 Recommendations
-- The remaining historical resources should be re-estimated
incorporating the current geological understanding of the island,
recent drilling and other geological data and any updated
topographical information. Outsourced this is estimated to cost
AUD$50 K.
-- The positive mining reconciliation should be investigated.
This could be done in-house or outsourced at an estimated cost of
AUD$30 K.
-- A critical review of current mining operations should be
undertaken and any revisions applied to the optimisation, pit
design and scheduling. This could be done in-house or outsourced at
an estimated cost of AUD$40 K.
-- Optimisation of the resource and reserve calculations, final
pit designs and scheduling should be revisited on a regular basis.
The pit optimisations need to be updated to reflect more recent
increasing trend in the gold price.
-- Exploration drilling to investigate the nature of the
sulphide mineralisation beneath the current Sorowar pit design
should proceed as a matter of priority. There appears to be
significant potential to increase the sulphide resource and reserve
base at Simberi, and thus improve the overall economics of the
project, through improving the understanding of the sulphide
mineralisation in the Sorowar area.
-- Expansion of the oxide plant to 3.5 Mtpa should proceed.
Estimated cost is $32 M.
-- Allied Gold should consider a Bankable Feasibility Study, in
conjunction with additional drilling, which will provide greater
confidence to the combined oxide and sulphide project. The cost of
a Bankable Study is estimated at $6-$10 M. The total cost of the
combined oxide and sulphide project is estimated at $278 M
including the $32 M oxide plant expansion.
-- Allied should closely manage its operating costs to keep its
costs within budget estimates.
3.0 Summary - Gold Ridge Project
3.1 Scope
This section is a summary of the Gold Ridge Project CPR which
has been prepared separately (set out in Section C of Part XIV of
the Prospectus).
3.2 Property Description and Location
The Gold Ridge Project is located on the island of Guadalcanal,
the central island of the Solomon Islands, approximately 30 km
south-east of the capital city Honiara. The project is accessed
from Honiara by approximately 40 km of varying quality road.
The mine area is located on the lower northern slopes of Mount
Chaunapaho in the central ranges of Guadalcanal Island. The project
area is extremely rugged, with very steep gradients and is heavily
forested. The area has a north-south aspect and an approximate
average elevation of 550 m. The gold deposits are situated in the
Chovohio and Charivungo river catchments in the headwaters of the
Matepono River. Both these rivers have steep gradients with a
combined catchment area of 17.4 km(2)
above their confluence. The river system falls from 1200 m
(Chovohio) and 800 m (Charivungo) to the
sea in 20 kilometres.
The property consists of Special Prospecting License (SPL) #194
covering an area of 130 km(2) which
surrounds a 30 km(2) Mining Lease (No 1/1997).
3.3 History
Serious exploration has been undertaken at the site since 1939.
The Project was an operating mine from 1998 until June 2000, when
it was shut down during the period of civil unrest. During the 22
months that the Valehaichichi mine was actively operating the total
gold production amounted to approximately 210,000 ounces.
After the shutdown, the camp and office buildings were destroyed
by people taking usable construction material. The refurbishment of
the plant by GRML is expected to be completed in March 2011.
The Gold Ridge project is managed by Gold Ridge Mining Limited
(GRML), a subsidiary of Australian Solomons Gold (ASG), which is in
turn a wholly owned subsidiary of Allied Gold Limited. Allied Gold
has held effective control of the property since March 2010.
3.4 Geology
Gold Ridge is located within the central part of Guadalcanal
Island which lies between the North Solomon Plate and the San
Cristobal Trench. Rock-types occurring on Guadalcanal range from
ultramafic to diorite intrusives, felsic to mafic and marine
sedimentary rocks to fluvial sediments.
The Gold Ridge deposits are hosted by the Lower Pliocene Gold
Ridge Volcanics. The Gold Ridge deposits are concentrations of
low-sulphidation intrusion related epithermal gold
mineralisation.
Mineralisation is related mainly to alteration and veining and
to a lesser extent lithology. Although alteration assemblages are
similar throughout Gold Ridge, the relative abundance and intensity
of alteration is different for each deposit. Valehaichichi hosts
the most intense and concentrated argillic and silica-pyrite
alteration. Propylitic alteration survived at Kupers and Dawsons
where argillic and silicapyrite alteration is less intense. Primary
porosity of shallow dipping lithologies as well as moderate to
shallow dipping fractures and veins combine to impart a strong
sub-horizontal distribution to gold mineralisation.
The Gold Ridge project comprises four separate gold deposits
called, from north to south, Valehaichichi, Namachamata, Kupers and
Dawsons. To date only Valehaichichi has seen any significant
mining, mostly by Ross Mining (August 1998 to June 2000). GRML
under Allied Gold has recently re-commenced mining operations in
the Valehaichichi pit. Numerous artisan workings can be found
throughout the mining lease area.
3.5 Metallurgy
The Gold Ridge processing plant treated 4.4 million tonnes of
ore from the Valehaichichi pit from August 1998 until the plant was
shut down due to escalating civil unrest in June 2000. The plant
produced approximately 210,000 ounces of gold at a mean gold
recovery of around 78%. Gold recovery generally trended downwards
during the period of operations ranging from a high of 86% in May
1999 to a low of 68% in April 2000.
In 2005 ASG initiated a metallurgical testwork programme to
resolve the reasons for the poor metallurgical performance within
segments of the deposits.
The Gold Ridge ores were considered to range from "free-milling"
to refractory. Processing by conventional cyanidation resulted in a
range of gold recoveries. Gold recovery was shown to correlate with
the arsenic content for the fresh and transition ores, but was
independent of it in oxide ores.
Average gold recoveries by ore type and by pit, are calculated
from the arsenic head grade using a
regression algorithm developed from the testwork.
3.6 Mineral Resources
A recoverable resource estimation was undertaken by Hellman and
Schofield Limited in 2008. The method used was Multiple Indicator
Kriging (MIK). The estimation is based on sample data from Diamond
and Reverse Circulation drill holes.
The resource at a cut off grade of 0.5 g/t Au is as shown in
Table 3-1.
Table 3-1: Gold Ridge Mineral Resources
Cut
Deposit off Measured Indicated Total
------- ------------ --------------- -------------
Au Au
Au g/t Mt g/t Mt Au g/t Mt g/t
Valehaichichi . . . .
. . . . . . . . . . .
. . . . . ...... 0.5 2.04 1.38 10.56 1.14 12.60 1.18
Namachamata . . . . .
. . . . . . . . . . .
. . . ..... 0.5 1.15 1.92 1.46 1.43 2.61 1.64
Kupers . . . . . . . .
. . . . . . . . . . .
. . . . . . ...... 0.5 3.95 1.54 10.97 1.23 14.92 1.31
Dawsons . . . . . . .
. . . . . . . . . . .
. . . . . . .... 0.5 1.09 1.40 17.91 1.27 19.00 1.28
Total . . . . . . . .
. . . . . . . . . . .
. . . . . . . . .... 0.5 8.24 1.53 40.89 1.23 49.13 1.28
Based on the Author's validation of the Hellman and Schofield
work, the models appear to be a consistent and reasonable
representation of the data.
3.7 Mineral Reserves
The latest Ore Reserves estimation for Gold Ridge was completed
by IMC in June 2010. Based on a USD$850 per ounce gold price the
current Reserves are as shown in Table 3-2.
Table 3-2: Gold Ridge Mineral Reserves
In situ Predicted Recovered
Mineral Reserve Category Tonnage Grade Au Au Recovery Au Grade
dry Mt g/t % g/t
-------- ---------- ------------- ----------
Proved . . . . . . . .
. . . . . . . . . . .
. . . . . . .... - - - -
Probable . . . . . . .
. . . . . . . . . . .
. . . . . .... 23.2 1.71 0.82 1.40
Proved + Provable . .
. . . . . . . . . . .
. . ...... 23.2 1.71 0.82 1.40
Waste . . . . . . . .
. . . . . . . . . . .
. . . . . . ..... 33.4
The Mineral Reserves are included in the Mineral Resources
stated above.
3.8 Interpretation and Conclusions
3.8.1 Resources
The shortcomings of early drilling and sampling have been
addressed adequately and the drill sample database used in the
resource estimation seems robust. The current resource estimation
is a reasonable reflection of the sample database and geological
understanding of the deposit. There is potential to improve the
selectivity of the resource by reconsidering the variance
reductions applied to the models.
3.8.2 Reserves
The mining fleet installed at Gold Ridge is considered
appropriate for the application and should provide sufficient
capacity to achieve the production rates set out in the Life of
Mine plan.
In reporting the Mineral Reserves, appropriate account has been
taken of the uncertainty associated with the plant recovery, by
converting Measure Mineral Resources within the pit design to
Probable Mineral Reserves, rather than Proven Mineral Reserves.
3.8.3 Metallurgy and Processing
The Gold Ridge processing plant operated from August 1998 until
the plant was shut down due to civil unrest in June 2000. The plant
has recently been refurbished and upgraded. A number of process
design changes and plant improvements have been incorporated in the
refurbished plant design to increase plant capacity, and mitigate
previous operational issues.
Ore commissioning of the upgraded plant commenced in March
2011.
Metallurgical testwork on Gold Ridge fresh and transitional ore
samples has shown that the ore types are partially refractory, and
that gold recovery is dependent on the arsenic grade of feed.
Further variability testing will be required to confirm the gold
recovery relationship.
Gold recovery in initial operations is predicted to be 72-74%
with ore from the Valehaichichi and Namachamata pits. Recovery is
then predicted to increase to 80-85% as increasing amounts of
Kupers and Dawsons are processed.
3.9 Recommendations
3.9.1 Mineral Resources
When the exploration and mine drilling is again fully
operational the drilling and sampling processes should be reviewed
to ensure they have been implemented as documented and are
applicable to the Gold Ridge geology and environment.
New drilling should be routinely validated against the current
models and trigger updates where changes are noted.
An investigation into the variance reductions applied in
modelling should be considered as a possible path to improving the
selectivity of the models and consequently any mine planning based
on these models.
3.9.2 Mineral Reserves
Once the mine is again fully operational the optimisation
parameters used in the reserve definition, especially recovery,
should be validated against production data.
3.9.3 Metallurgy and Processing
Variability metallurgical testing should be undertaken on drill
samples and plant feed samples to further develop gold recovery
prediction relationships, and minimise variations in plant
metallurgical recovery.
This information is provided by RNS
The company news service from the London Stock Exchange
END
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