Regional
Setting
The Pine Creek Inlier is an area of mostly sedimentary rocks
dating to the Early Proterozoic Era
(approximately 1,800 million years ago). It is one of a number
of such sedimentary basins of similar
age, geological history and gold endowment.
The Pine Creek Inlier is recognized in “The Geology of
the Mineral Deposits of Australia and Papua
New Guinea”, as the Australian Proterozoic basin with the
greatest number of deposits containing
more than 3 tonnes (100,000 ounces) of gold. In particular the
gold deposits of the Tanami and
Pine Creek regions have many characteristics in common. Anticlinal
structures and persistent shear
zones are major hosts. In the Company’s view the Pine Creek
region displays all the key geological
characteristics thought to be associated with gold deposits of
the style, scale and grade of the
+5 million ounce Callie gold deposit in the Tanami region.
The most prospective host rocks of the Pine Creek Inlier occur
over much of the area of Australasia
Gold’s tenements, at surface and at relatively shallow
depth, but are often concealed by shallow
transported overburden. The overburden has inhibited their effective
exploration.
The Pine Creek Project
Australasia Gold’s Pine Creek Project includes a block
of mineral claims covering the Glencoe
gold deposit, tenements covering four satellite gold occurrences
(plus extensions) in reasonable
proximity to Glencoe, and a joint venture right to explore for
and mine gold in prospective
adjacent areas.
Past exploration expenditure at Glencoe alone exceeds $2.1 million.
Glencoe Deposit
The total of measured, indicated and inferred resources at the
Glencoe deposit has been estimated
as approximately 1.5 million tonnes (Mt) averaging 1.9 grams/tonne
(g/t), containing approximately
90,000 ounces of gold, to 100m depth. The estimate was prepared
in accord with the then current
provisions of the JORC Code. The deposit displays many features
characteristic of the quartz-vein
hosted style of mineralisation which is particularly widespread
in the Pine Creek Inlier (e.g. nterprise,
Union Reefs, Toms Gully, Woolwonga and Zapopan). The production
histories and current resources
of these deposits show the potential of this ore style to develop
significant bodies of better grade.
For example: Toms Gully (resources + production approximately
2.5 Mt averaging 8-9 g/t gold),
Zapopan (resources approximately 0.3 Mt averaging 15 g/t gold)
and Cosmo Howley: (7.5 Mt
averaging 4.3 g/t gold – i.e. more than 1 million ounces,
including a higher grade component of
2 Mt in excess of 6 g/t).
The Glencoe deposit was drilled to a maximum depth of 100 metres,
and bulk sampled during the
1980’s. Some 70,000 tonnes of ore are recorded as having
been excavated from four shallow trial
pits. The records reveal the recovery of 37% more tonnes than
was contained in the relevant part of
the detailed resource model, without dilution of the estimated
grade. From this it may be inferred that
the resource estimate is conservative as to tonnage, while the
grades predicted from drilling and gold
recovery from oxidised ore were validated by the trial. Details
are reported in the Independent
Geologists Report (Section 5.4.2.) Only preliminary metallurgical
tests were made on primary
mineralisation, with variable results.
Each of the four shoots which make up the Glencoe resource remains
open at depth, particularly in
the easterly down plunge extension direction.
The Redbank Mineral Claim located three km to the west of Glencoe
shows high gold values in
the near surface gossan zone of an apparently stratabound gold
occurrence (e.g. a costean intercept
of 8m averaged 10.9 g/t gold, and a shallow drillhole intercept
of 8m averaged 19.3 g/t gold). Limited
reverse circulation (RC) drilling failed to locate the immediate
extensions of this mineralisation.
Feasibility Considerations
It is the Board’s view that changes in mining and processing
technology, gold price and cost
structures since the original evaluation, and the exploration
potential of the deposit, warrant a new
feasibility study. Glencoe is situated in close proximity to
all-weather road access and other regional
infrastructure and services which should facilitate mining efficiency
and cost management.
In order to determine how much of the Glencoe resource may be
economic to mine, metallurgical
testing of primary mineralisation and geotechnical studies to
optimize pit design will be required, as
well as environmental investigations and other work preparatory
to permitting.
Barring currently unexpected developments in the feasibility
investigation phase, and subject to the
satisfying itself as to the profitability of mining and the availability
of toll milling capacity, the Board
anticipates Australasia Gold could be ready to commence production
from the Glencoe deposit within
12 months of listing.
Pine Creek Exploration
Blocks of Mineral Leases cover each of Johns Hill, Star of the
North, Great Northern and Great Western
gold deposits. EL 24142 covers the strike extensions largely
beneath alluvial cover of the mineralised
structures hosting these deposits and other gold deposits in
the district.
A joint venture with Softwood Plantations Pty Ltd in the McKinlay
area approximately 30 km east of
Glencoe grants to Australasia Gold a 100% interest in any gold
mineralisation discovered in two
exploration licences EL’s 22301 & 23824.
All of these areas are located within trucking distance of Glencoe.
Most contain relics of historic mining.
All contain features which are elsewhere associated with the
major gold deposits of the region. Much
of the area is concealed by blacksoil plain, diminishing the
effectiveness of the reconnaissance
previously undertaken by prospectors and explorers. The Company
regards the areas as highly
prospective for thinly concealed structurally controlled gold
deposits of the Pine Creek - Tanami style.
Program for the Pine Creek Project
As soon as practicable after listing, the Company will commence
a program to complete the
feasibility study of mining at Glencoe, including drilling, dump
sampling, metallurgical testing, detailed
mine planning, and the estimation of ore reserves. Exploration
drilling will target the intersection of
mineralising structures with deeper, more prospective stratigraphic
horizons. Environmental studies
which may be necessary for permitting purposes will also be undertaken.
Initial exploration work will be principally geological in nature,
including detailed review of past
exploration results, regolith studies and field reconnaissance.
Field programs, including bedrock
geochemical and IP geophysical surveys, prior to drilling will
commence in the second year.
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