Dynamite
- 16 Jul 2007 07:42
- 9 of 122
MEDUSA MINING LIMITED
BAROBO MINERALISED CORRIDOR
Medusa Mining Limited ('Medusa' or the 'Company'), the Australian based company
operating and developing gold mines in the Philippines, advises that it has now
received all sample results and assessments undertaken during the regional
evaluation of the northern section of tenements in the Company's portfolio. The
regional exploration initiative was referred to in the ASX announcement of 27
June 2007 as being in progress.
This work has identified the newly designated 16 kilometre long Barobo Corridor
which has a combination of features suggestive of a regional scale
mineralisation system capable of hosting several different styles of gold
deposits as well as porphyry copper-gold and related deposits. These features
include:
the intersection of the regional scale mineralised north-north
west-trending Barobo Fault with the Lianga Bay Fault which is interpreted to
be the major focal point for the extensive Tambis area 9.5 x 7.3 kilometre
aeromagnetically defined intense argillic alteration zone;
the prominent Barobo Fault corridor exending southwards from the Tambis
area appears to control numerous vein style and siliceous replacement gold
occurrences with high grades in outcrops and boulders in favourable host
rocks; and
the presence of diorite and dacite intrusives exhibiting porphyry copper
style alteration and shedding associated anomalous stream sediment copper
values.
Geoffrey Davis, Managing Director of Medusa, commented:
'These results show the presence of a major mineralised system potentially
containing significant gold and copper deposits. A number of porphyry copper and
gold targets have been located along the Barobo Fault and we are now assessing
various exploration methods that will provide us with detailed data for
advancing targets to the drilling stage.'
Barobo Corridor
The Barobo Corridor has been defined from remote sensing techniques including
satellite imagery, aerial photography and aeromagnetics, as well as regional
mapping, and surface sampling where appropriate. The aeromagnetics, regional
mapping, pan concentrate and surface sampling were completed by the Company. All
other information provided is historic. The Barobo Corridor is located at the
northern end of the Company's tenements.
The Barobo Corridor extends over approximately 16 kilometres (and open to the
south) straddling a major fault named the Barobo Fault that parallels the main
Philippine Rift Fault located approximately 25 km to the west.
The Barobo Fault is a significant aeromagnetic feature and is topographically
distinctive.
The Tambis regional area is located within a bullseye 9.5 by 7.3 kilometre
aeromagnetic anomaly indicative of and resulting from intense argillic
alteration. This widespread alteration has been field verified in numerous
places and is located to the south of the intersection of two regional scale
faults, the Barobo Fault and the major west-northwest trending Lianga Bay Fault
and partly straddling the Barobo Fault. The fault intersection is to the
immediate west of the Bananghilig Gold Mine.
It should be emphasised that reconnaissance field exploration to date has been
restricted to mapping and sampling of outcropping rocks on ridges and in creeks
and silica boulder trains with a large number of the outcrops being identified
as potentially mineralised. Various exploration methods are being assessed to
provide detailed regional scale data for prioritising targets for additional
work.
(i) Porphyry targets
At the northern end of the Barobo Corridor is the Sopon porphyry copper target
which consists of an altered and quartz veined diorite with visible copper
minerals. The target is associated with an area of aeromagnetic complexity
within the large intense argillic alteration anomaly. The diorite is associated
with massive sulphide skarn-style mineralisation which is not yet fully defined.
In the 1990s stream sediment sampling programme described below, one sample in a
small creek near the Sopon porphyry copper prospect recorded an anomalous value
of 124 ppm copper, and a stream sediment sample 2km to the west recorded 17.3
ppm gold.
A regional stream sediment sampling programme carried out in the 1990s over the
entire strike length of the Company's tenements by a previous explorer located
the highest regional stream sediment copper values in three creeks draining the
Bananghilig Mine area, being 1,662 ppm, 616 ppm and 530 ppm. This programme was
not systematic in that sampling was restricted to drainages accessible by road;
as a result large areas were not sampled.
The above stream sediment sampling programme post dates the large BLEG anomaly.
The BLEG survey was a systematic programme carried out specifically to target
gold.
The Sumugbong porphyry target consists of altered and quartz veined diorite
located to the west of the Alikway and Guinhalinan Prospects located in the
southern part of the Barobo Corridor. The 1990s regional stream sediment survey
referred to above also sampled in two creeks distant from and draining
southwards from this porphyry target and recorded regionally anomalalous copper
values of up 124 ppm.
(ii) Gold targets
A plethora of gold targets of several different styles have been located along
the Barobo Fault over a strike length of over 10 kilometres and still open to
the south. Pan concentrates were initially employed to delineate gold targets
but the presence of ubiquitous visible gold in all creeks has rendered pan
concentrates sampling as essentially non-discriminating, hence other regional
methods are being investigated. This is a very large area (approximately 21 by 8
kilometres), encompassing the Bananghilig Mine and Sopon porphyry target and
other prospective areas, of anomalous stream sediment BLEG gold values defined
by an earlier explorer. The area partially overlaps the extensive argillic
alteration zone. Some of the styles are:
Silica replacement style targets in sediments: These include the
Guinhalinan Prospect and number of areas to the north of Guinhalinan where
silicification of limestones and siltstones has occurred and where outcrops
have returned up to 2.3 metres at 16.23 g/t gold and 1.85 metres at 8.86g/t
gold, and grab samples returning up to 16.94 g/t gold. The silicified zones
are commonly controlled by numerous northeast-trending structures which may
result in the development of large areas of silicification. Some of the
silicified zones are also brecciated such as south of Campagang where
outcrops have returned up 80.26g/t gold. Gold mineralisation appears to be
ubiquitous in the silicified zones, along with common lead and zinc
mineralisation in potentially commercial quantities. Copper mineralisation
has also been identified in some areas.
Skarn style targets in limestones: Some subtle aeromagnetic anomalies
have been identified as containing skarn-style silica replacement in
limestones with gold, lead and zinc and disseminated magnetite, including in
the area slightly north east of Sumugbong Creek.
Veins: A large number of veins have been identified commonly with a
northeast trend. The most consistent of these to date is the Alikway Vein
where high grade mineralisation (including 1.40 metres at 33.89 g/t gold,
0.5 metres at 26.41 g/t gold and 0.4 metres at 15.73 g/t gold) has been
identified over a distance of approximately 500 metres and is open in both
directions. Numerous other veins in the Alikway vicinity, particularly to
the south, have also been discovered, such as at Matanog where samples have
returned up to 0.6 metres at 24.8 g/t gold..
It should also be noted that there is a very large area of anomalous stream
sediment BLEG gold values defined by an earlier explorer covering an area of
approximately 21 by 8 kilometres in the area encompassing the Bananghilig Mine
and Sopon porphyry target and other prospective areas.
Maps and cross sections which accompany this announcement can be viewed in the
ASX version of the announcement on the Company's website:
www.medusamining.com.au
Dynamite
- 04 Sep 2007 08:24
- 14 of 122
MEDUSA MINING LIMITED
ABN: 60 099 377 849
Unit 7, 11 Preston Street
Como WA 6152
PO Box 860
Canning Bridge WA 6153
Telephone: +618-9367 0601
Facsimile: +618-9367 0602
Email:
admin@medusamining.com.au
Internet:
www.medusamining.com.au
MEDUSA MINING LIMITED
713,000 RESOURCE OUNCES
Medusa Mining Limited ("Medusa" or the "Company"), the Australian
based company operating and developing gold mines in the Philippines,
is pleased to advise that it has completed new resource and reserve
estimations at the Co-O Mine.
The Resource estimation has increased the contained ounces by 446,000
ounces (266%) to 713,000 ounces using a lower cut of 3 g/t gold.
+---------------------------------------------------------------------+
|Category | > 0 g/t gold | > 3 g/t gold |
| |----------------------------+----------------------------|
| | tonnes | g/t | ounces | tonnes | g/t | ounces |
| | | gold | | | gold | |
|-----------+-----------+------+---------+-----------+------+---------|
|Indicated | 1,040,000| 11.5| 386,000| 928,000| 12.6| 377,000|
|-----------+-----------+------+---------+-----------+------+---------|
|Inferred | 1,320,000| 8.3| 351,000| 1,106,000| 9.5| 336,000|
|-----------+-----------+------+---------+-----------+------+---------|
|Grand total| 2,360,000| 9.7| 737,000| 2,034,000| 10.9| 713,000|
+---------------------------------------------------------------------+
The Reserve estimation has increased the contained ounces by 162,000
ounces (272%) to 256,000 ounces using a lower cut of 3 g/t gold.
+-----------------------------------------+
| Category | > 3 g/t gold |
| |------------------------------|
| | tonnes | g/t gold | ounces |
|----------+---------+----------+---------|
| Probable | 717,000 | 11.1 | 256,000 |
+-----------------------------------------+
Drilling is continuing with the objective to achieve a resource
target of 1 million ounces of similar grade.
Geoffrey Davis, Managing Director of Medusa, commented:
"These extremely robust resource and reserve numbers are quite
exceptional. We are confident that, with additional drilling over the
coming months, we can achieve a target resource of one million
ounces, at a similar grade. The Directors have a high expectancy of
converting a large proportion of the Inferred Resources into
reserves."
RESOURCE ESTIMATIONS
Discussion
A deep diamond drilling program was commenced in December 2006 with
the aim of extending the known Co-O vein system to depth and along
strike. A total of 25 drill holes have been completed of which 20
have been used in the resource estimation in conjunction with
available underground sampling data. The 5 holes not used are outside
the resource area.
Vein modelling
Cube Consulting Pty Ltd of Perth, Western Australia were contracted
to undertake resource estimations based on a wire frame model of the
vein system. As discussed in the announcement of 15 August 2007, the
model has focused on the main veins and does not include other drill
hole intersections, which are attributed to vein splits.
Resource Estimations
The resource estimations have utilised the following methodologies
and parameters:
* Creation of a digital geological interpretation based on all
available information, as at 31 July 2007, and comprising
construction of digital hanging walls and footwalls for each vein;
* Estimation of vein resources below the 3150 metre level for veins
which have current mine development (Central, Breccia and North
Veins) and new veins defined by drilling alone (Edphil, Jereme, New
Catto Veins 1, 2 and 3);
* Account for mining depletion to 31 July 2007;
* Provide technical input to resource classification and reporting of
resources in accordance with The 2004 Australasian Code for
Reporting of Mineral Resources and Ore Reserves (JORC Code); and
* Provide resource models suitable for VALMIN evaluation, planning
and formulation of reportable reserves.
Table I. Co-O Mine mineral resource estimates
+-----------------------------------------------------------------------------------+
|Vein name| Category | > 0 g/t gold | > 3 g/t gold |
| | |------------------------------+------------------------------|
| | | tonnes | g/t | contained | tonnes | g/t | contained |
| | | | gold | ounces | | gold | ounces |
|---------+-----------+-----------+------+-----------+-----------+------+-----------|
|Central |Indicated | 494,000| 11.6| 184,000| 477,000| 11.9| 183,000|
|---------+-----------+-----------+------+-----------+-----------+------+-----------|
| |Inferred | 594,000| 5.5| 106,000| 584,000| 5.6| 105,000|
|---------+-----------+-----------+------+-----------+-----------+------+-----------|
| |Sub Total | 1,088,000| 8.3| 290,000| 1,061,000| 8.4| 288,000|
|---------+-----------+-----------+------+-----------+-----------+------+-----------|
|North |Indicated | 152,000| 5.6| 28,000| 102,000| 7.2| 23,000|
|---------+-----------+-----------+------+-----------+-----------+------+-----------|
| |Inferred | 128,000| 2.5| 10,000| 33,000| 3.6| 4,000|
|---------+-----------+-----------+------+-----------+-----------+------+-----------|
| |Sub Total | 280,000| 4.2| 38,000| 135,000| 6.3| 27,000|
|---------+-----------+-----------+------+-----------+-----------+------+-----------|
|Breccia |Indicated | 30,000| 5.5| 5,000| 24,000| 6.2| 5,000|
|---------+-----------+-----------+------+-----------+-----------+------+-----------|
| |Inferred | 124,000| 2.8| 11,000| 31,000| 4.5| 4,000|
|---------+-----------+-----------+------+-----------+-----------+------+-----------|
| |Sub Total | 154,000| 3.3| 16,000| 55,000| 5.3| 9,000|
|---------+-----------+-----------+------+-----------+-----------+------+-----------|
|Jereme |Indicated | 72,000| 13.4| 31,000| 72,000| 13.4| 31,000|
|---------+-----------+-----------+------+-----------+-----------+------+-----------|
| |Inferred | 186,000| 7.9| 47,000| 186,000| 7.9| 48,000|
|---------+-----------+-----------+------+-----------+-----------+------+-----------|
| |Sub Total | 258,000| 9.5| 78,000| 258,000| 9.5| 79,000|
|---------+-----------+-----------+------+-----------+-----------+------+-----------|
|Edphil |Indicated | 163,000| 5.2| 27,000| 124,000| 6.0| 24,000|
|---------+-----------+-----------+------+-----------+-----------+------+-----------|
| |Inferred | 112,000| 5.7| 21,000| 96,000| 6.3| 19,000|
|---------+-----------+-----------+------+-----------+-----------+------+-----------|
| |Sub Total | 275,000| 5.4| 48,000| 220,000| 6.1| 43,000|
|---------+-----------+-----------+------+-----------+-----------+------+-----------|
|New Catto| | | | | | | |
|---------+-----------+-----------+------+-----------+-----------+------+-----------|
|1 |Indicated | 23,000| 55.0| 40,000| 23,000| 55.0| 40,000|
|---------+-----------+-----------+------+-----------+-----------+------+-----------|
| |Inferred | 29,000| 54.7| 52,000| 29,000| 54.7| 52,000|
|---------+-----------+-----------+------+-----------+-----------+------+-----------|
| |Sub Total | 52,000| 54.8| 92,000| 52,000| 54.8| 92,000|
|---------+-----------+-----------+------+-----------+-----------+------+-----------|
|New Catto| | | | | | | |
|---------+-----------+-----------+------+-----------+-----------+------+-----------|
|2 |Indicated | 53,000| 5.6| 9,000| 53,000| 5.6| 9,000|
|---------+-----------+-----------+------+-----------+-----------+------+-----------|
| |Inferred | 87,000| 6.0| 17,000| 87,000| 6.0| 17,000|
|---------+-----------+-----------+------+-----------+-----------+------+-----------|
| |Sub Total | 140,000| 5.9| 26,000| 140,000| 5.9| 26,000|
|---------+-----------+-----------+------+-----------+-----------+------+-----------|
|New Catto| | | | | | | |
|---------+-----------+-----------+------+-----------+-----------+------+-----------|
|3 |Indicated | 55,000| 34.7| 61,000| 55,000| 34.7| 61,000|
|---------+-----------+-----------+------+-----------+-----------+------+-----------|
| |Inferred | 58,000| 46.9| 88,000| 58,000| 46.9| 88,000|
|---------+-----------+-----------+------+-----------+-----------+------+-----------|
| |Sub Total | 113,000| 41.0| 149,000| 113,000| 41.0| 149,000|
|---------------------+-----------+------+-----------+-----------+------+-----------|
|Grand Total | 2,360,000| 9.7| 737,000| 2,034,000| 10.9| 713,000|
+-----------------------------------------------------------------------------------+
The resource estimations have been undertaken by Cube Consulting Pty
Ltd.
The modelling technique addressed the following issues:
* Variable mineralised vein thickness ranging from 0.5 to 9 metres;
* The taking of samples, by necessity, over geological intervals
creating samples of unequal length or variable support;
* Assuming a relatively constant density;
* Undulating or variable zone geometry (dip and strike) and the
presence of grade/thickness trends within this variable geometry;
* Across vein mining selectivity is unlikely; and
* Data spacing is variable and often clustered.
Cube applied a 2D longitudinal modelling approach based on an
accumulation variable incorporating mineralised vein horizontal width
and intercept grade.
Variography has been used to analyse the spatial continuity of the
horizontal width and accumulation variables within the mineralised
veins and to determine appropriate estimation inputs to the
interpolation process. The accumulation variables were interpolated
into blocks using Ordinary Kriging.
It is important to note that the "variable" that is estimated is
"metal" based on the accumulation variable rather than the thickness
or grade component alone, thus eliminating issues relating to
variable thickness.
Variography was based on the Central Vein and resulted in well
structured variogram models with a nugget effect of 37% and a maximum
range of 62 metres for the accumulation variable. Variography of the
horizontal width was similar with a relative nugget effect of 36% and
a maximum range of 81.3 metres.
High grade limits were applied to gold prior to the calculation of
the accumulation variable. Within the Central and North Veins a high
grade limit of 300g/t gold was applied representing values in excess
of the 99th percentile of the gold distribution data.
Reserve Estimations
Golder Associates Pty Ltd of Perth Western Australia were contracted
to undertake a reserve estimation based on the resource wireframe
model provided by Cube Consulting Pty Ltd as described above.
The reserve estimation was derived from the Indicated Resource of
928,000 tonnes at 12.6 g/t gold containing 377,000 ounces of gold.
Table II: Co-O Mine probable reserve estimates
+--------------------------------------------+
| Vein name | > 3 g/t gold |
| |------------------------------|
| | tonnes | g/t gold | ounces |
|-------------+---------+----------+---------|
| Central | 358,000 | 10.0 | 115,000 |
|-------------+---------+----------+---------|
| North | 80,000 | 6.2 | 16,000 |
|-------------+---------+----------+---------|
| Breccia | 18,000 | 5.2 | 3,000 |
|-------------+---------+----------+---------|
| Jereme | 58,000 | 12.2 | 23,000 |
|-------------+---------+----------+---------|
| Edphil | 99,000 | 5.5 | 18,000 |
|-------------+---------+----------+---------|
| New Catto 1 | 18,000 | 50.0 | 29,000 |
|-------------+---------+----------+---------|
| New Catto 2 | 42,000 | 5.1 | 7,000 |
|-------------+---------+----------+---------|
| New Catto 3 | 44,000 | 31.6 | 45,000 |
|-------------+---------+----------+---------|
| Grand Total | 717,000 | 11.1 | 256,000 |
+--------------------------------------------+
The reserve estimations have been undertaken by Golder Associates Pty
Ltd.
The parameters utilised for the estimation include the following:
* A minimum diluted mining width of one metre;
* A block cut-off of 3 g/t gold;
* A dilution factor of 10% at 0 g/t gold; and
* A mining recovery of 73%.
Golder has classified the ore reserves in compliance with the JORC
Code as Probable Reserves.
Maps and cross sections which accompany this announcement can be
viewed in the ASX version of the announcement on the Company's
website:
www.medusamining.com.au
Please cut and paste the links below into your web browser for maps
and cross sections that accompany this announcement and inter alia,
illustrate the location of all the diamond drill holes drilled around
the Co-O Mine since December 2006.
Medusa Mining Limited +61 8 9367 0601
Geoffrey Davis, Managing Director
Roy Daniel, Finance Director
Ambrian Partners +44 (0)20 7776 6417
Richard Brown / Richard Greenfield
Bankside Consultants +44 (0)20 7367 8888
Michael Padley / Louise Davis
JORC COMPLIANCE - CONSENT OF COMPETENT PERSONS
Medusa Mining Limited
Information in this report relating to Exploration Results, is based
on information compiled by Mr Geoff Davis, who is a member of The
Australian Institute of Geoscientists. Mr Davis is the Managing
Director of Medusa Mining Limited and has sufficient experience which
is relevant to the style of mineralisation and type of deposits under
consideration and to the activity which he is undertaking to qualify
as a Competent Person as defined in the 2004 Edition of the
"Australian Code for Reporting of Exploration Results, Mineral
Resources and Ore Reserves". Mr Davis consents to the inclusion in
the report of the matters based on his information in the form and
context in which it appears.
Cube Consulting Pty Ltd
Information in this report relating to Mineral Resources has
been estimated and complied by Mark Zammit of Cube Consulting Pty
Ltd. Mr Zammit is a member of The Australasian Institute of Mining &
Metallurgy and has sufficient experience that is relevant to the
style of mineralisation and type of deposit under consideration and
to the activity which he is undertaking to qualify as a Competent
Person as defined in the 2004 Edition of the "Australian Code for
Reporting of Exploration Results, Mineral Resources and Ore
Reserves". Mr Zammit consents to the inclusion in the report of the
matters based on his information in the form and context in which it
appears.
Cube Consulting is an independent Perth based resource industry
consulting firm specialising in geological modelling, resource
estimation and information technology.
Golder Associates Pty Ltd
The information in this report that relates to Ore Reserves is based
on information compiled by Charles Hastie BAppSc (Mining
Engineering), B AppSc (Multidisciplinary Science), MAusIMM and Peter
Onley MBA, MSc, BSc (Hons), FAusIMM, CP. Mr Hastie and Mr Onley are
full-time employees of Golder Associates Pty Ltd.
Messrs Hastie and Onley have sufficient experience which is relevant
to the style of mineralisation and type of deposit under
consideration and to the activity which they are undertaking to
qualify as Competent Persons as defined in the 2004 Edition of the
"Australasian Code for Reporting of Exploration Results, Mineral
Resources and Ore Reserves". Charles Hastie and Peter Onley consent
to the inclusion in the report of the matters based on their
information in the form and context in which it appears.
Golder Associates is a global consulting group employing more than
5500 staff offering services in earth engineering and environmental
sciences.
---END OF MESSAGE---
http://hugin.info/138050/R/1150858/220733.doc
Dynamite
- 01 Nov 2007 10:19
- 17 of 122
Published date:Thursday, November 1, 2007
Fast-rising gold producer Medusa Mining (MML:AIM) has been identified as one of ten takeover targets for Avocet Mining (AVM:AIM). Chief executive Jonathan Henry confirmed that Medusa had been approached, but insisted talks were at an early stage.
Avocet should produce 178,000 ounces of gold this financial year. The company wants to expand its Penjom mine in Malaysia and North Lanut in Indonesia; and the Bakan project should start production in 2009. It believes an acquisition, funded from a $100 million cash pile, could potentially advance group gold output to 300,000 ounces per year. Henry told Shares that a short list of targets had been drawn up, including Philippines-based Medusa, and that Avocet had initiated the process with each business. The hardest thing is the characters in mining. Everyone thinks their company is undervalued so they dont want to talk about M&A, said Henry.
He said Avocet would focus on south east Asia for acquisition targets. Aside from Medusa, Allied Gold (AGLD:AIM) is the only UK-quoted gold producer in the region and is the right size for Avocets needs. One analyst said the company may stretch to Australia but said the market is quiet on Avocets targets. It could be anyone, quoted or private. Its shares have risen 46% to 168p since August.
Shares says: Bouncing back after restructuring with plenty of growth potential