Rerelease High Grade Uranium Intersected in Mauritania
17 Março 2008 - 4:01AM
UK Regulatory
MURCHISON UNITED NL
ASX, AIM and Media Release
17 March 2008
Re-release of Announcement from 13 March 2008
In order to provide clarification to investors, the Company has re-released its announcement from 13 March
that reported initial downhole radiometric logging results from drilling carried out at its Bir En Nar
uranium prospect in Mauritania. Additional information has been included with respect to the wireline
logging procedure used to obtain these results.
HIGH-GRADE URANIUM INTERSECTED AT BIR EN NAR URANIUM PROSPECT, MAURITANIA
Highlights
- Several high-grade uranium intersections indicated from downhole radiometric logging of samples
from RC drilling at the Bir En Nar uranium prospect (Zednes Region, Mauritania).
- Logging results received from eight holes of the 41-hole (4,006m) programme, significant results
included:
Drill Hole Section Intersection Thickness eU3O8
RC From (m) (m) (ppm)
BNR02 27.20 5.65 4,070
" " 58.30 0.70 5,750
BNR04 6.25 1.00 7,180
BNR05 40.20 3.85 3,400
BNR07 24.40 2.15 5,130
Drill Hole Section Intersection Thickness eU3O8
RC From (m) (m) (ppm)
BNR08 55.50 1.45 3,010
" " 70.80 2.35 ** 11,250
" " 87.45 1.55 5,060
- Further downhole radiometric logging results, together with assay results, will be released when
received.
Drilling Results - Mauritania
Murchison United NL (ASX: MUR, AIM: MUU - "Murchison") is pleased to announce that it has received
significant high-grade results from downhole radiometric logging of samples from the recently completed
maiden RC drilling program at the Company's 100% owned Bir En Nar uranium prospect, located in the northern
Zednes region of the Republic of Mauritania, West Africa (see Fig. 3).
To date, downhole logging results have been received for eight holes from the initial drilling program,
which comprised a total of 41 RC drill holes of 50 to 150 metres length, inclined 60� towards south west
(with a few exceptions) for a total of 4,006m. This programme was carried out during December 2007 by AMCO
Construction under the supervision of Murchison's Technical Director, Bosse Gustafsson (see Fig. 1).
To view Fig.1 Drilling in Mauritania, December 2007, please open the following link in a new window:
http://media3.marketwire.com/docs/muu0317fig1.pdf
Anomalous radioactivity was observed on samples from all but six holes, with the best recorded samples
exceeding 30,000 c/s with a scintillometer SGR from GF instruments.
Poseidon Geophysics carried out radiometric logging to enable calculation of the equivalent uranium
content. Results have been received for eight holes so far, with significant readings recorded in seven.
Four holes contained intercepts exceeding 5,000ppm eU3O8, with a maximum intercept of 2.35m at 11,250ppm
eU3O8. These results are considered to be very encouraging and confirm the prospectivity for uranium
mineralization. The Company will announce further results from downhole logging and assay results as soon
as they are received.
The downhole gamma ray logging, calculation of equivalent uranium grades, and compositing of mineralised
intervals was conducted by consultants Poseidon Geophysics (Pty) Ltd. All holes logged were inclined at
approximately 60�, with the deepest hole probed being 150 metres. Three holes were not able to be logged
due to collapsed bore holes. The logging programme was undertaken with an Auslog Logging System with the
estimated grades reported herein based on calculations by Poseidon Geophysics using data logged at 5 cm
sampling intervals (see Note at end of this report for further details).
To view Fig.2 Bir En Nar 2007 drilling program, locations of first eight holes, please open the following
link in a new window: http://media3.marketwire.com/docs/muu0317fig2.pdf
The drilling focused on one of the Company's southernmost licences at the Bir En Nar, where episyenite
samples collected during previous field reconnaissance visits returned assays of up to 9,500ppm Uranium.
The Bir En Nar prospect is a 900 metre long radioactive zone extending 50-70 metres in width and following
a tectonic structure in a NW-SE direction (see Fig. 2). A smaller parallel zone occurs a few hundred metres
to the SW. The main mineralisation occurs along a fracture zone at the contact between higher radioactive
granite in south west and lower radioactive syenite in north east. Episyenite pods with uranium
impregnation build up the mineralisation. The prospect was covered by RC drilling with SW-NE traverses at
70 metre spacings.
Radiometric logging results received to date from initial drilling at the Bir En Nar Prospect:
Drill Hole Section Intersection Thickness eU3O8
RC From (m) (m) (ppm)
BNR01 4.60 0.65 540
BNR02 27.20 5.65 4,070
34.20 2.15 770
58.30 0.70 5,750
62.75 0.30 1,470
89.40 0.75 1,230
104.30 0.55 1,730
BNR03 No anomaly
BNR04 6.25 1.00 7,180
BNR05 40.20 3.85 3,400
BNR06 91.60 4.00 580
BNR07 24.40 2.15 5,130
BNR08 55.50 1.45 3,010
70.80 2.35 11,250
74.10 0.40 2,060
85.15 1.40 3,130
87.45 1.55 5,060
Approximately 1,000 assay samples, each representing 1 metre of drilling, were also collected for multi-
element analysis in Canada by ALS Chemex. Assay results will be released as they become available.
The permit areas are located in the north of the country near the town of Bir Moghrein and at Bir En Nar in
Zednes region. These were originally identified by the Company's Technical Director, Mr Bosse Gustafsson,
from a study commissioned by the World Bank and further refined from aeroradiometric data highlighting the
region's prospectivity for uranium occurrences.
To view Fig.3 Location of Murchison United's exploration permits in Mauritania, please open the following
link in a new window: http://media3.marketwire.com/docs/muu0317fig3.pdf
Murchison United has secured an extensive portfolio of uranium exploration projects comprising some
13,600km2 of highly prospective tenements in Mauritania and Guinea, West Africa. Its objective is to
delineate significant new uranium deposits within these under-explored terrains.
In Guinea, initial drilling of the Company's Bohoduo uranium prospect and reconnaissance exploration at the
Sesse uranium prospect is to be carried out during Q2 2008.
A 5,000m diamond drilling program at Firawa prospect in Guinea, is scheduled to commence in September 2008
following the wet season, targeting a JORC compliant resource estimate to follow up initial drilling
carried out in 2007.
Commenting on the results, Murchison United's Managing Director, Mr Mark Reilly, said "The exciting results
attained so far at Bir En Nar in Mauritania follow on from the successful drilling program undertaken last
year at Firawa, Guinea, and the recently completed A$7.4 million share placement.
We are eagerly awaiting the remaining logging and assay results from Bir En Nar and we look forward to
embarking on further drilling programmes this year at the Bohoduo and Firawa Prospects in Guinea."
Murchison United NL is an Australian-based no liability company whose principal activity is minerals
exploration. The company currently has uranium exploration projects in Mauritania and Guinea in West Africa
and copper interests in the Millennium copper leases in Cloncurry, Queensland and the Maroochydore copper
project in Western Australia.
Shares in the company are listed on both the Australian Stock Exchange (ASX: MUR) and the Alternative
Investment Market (AIM: MUU) of the London Stock Exchange
For further information regarding this announcement, please call Mark Reilly.
..........
Mark Reilly
Managing Director
Notes:
The information in this report that relates to exploration results in West Africa is based on information
compiled by Mr. Bosse Gustafsson, who is a member of the European Federation of Geologists a Recognised
Overseas Professional Organisation ("ROPO"). Mr Bosse Gustafsson is a full time Technical Director of
Murchison United NL and is responsible for exploration activities in Mauritania and Guinea. Mr Gustafsson
has sufficient experience, which is relevant to the style of mineralisation and the 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
Reserve'. Mr Gustafsson consents to the inclusion in this report of the matters based on their information
in the form and context in which it appears.
Down hole gamma logging/probing of drill holes provides a powerful tool for uranium companies to explore
for, and evaluate, uranium deposits. Such a method measures the natural gamma rays emitted from material
surrounding a drill hole out to around 0.5 metre from its centre - the gamma probe is therefore capable of
sampling a much larger volume than that which would normally be recovered from a core or RC hole. These
measurements are used to estimate uranium concentrations with the commonly accepted initial assumption
being that the uranium is in (secular) equilibrium with its daughter products (or radio-nuclides) which are
the principal gamma emitters. If uranium is not in equilibrium (viz. in disequilibrium) - as a result of
the redistribution (depletion or enhancement) of uranium and/or its daughter products - then the true
uranium concentration in the holes logged using the gamma probe will be higher or lower than those reported
in the announcement.
Total count gamma logging does not account for energy derived from thorium and potassium but is calibrated
on the uranium band and factor applied to account for the average effect of thorium and potassium and thus
the result is expressed as an equivalent value or ppm eU308. The logging programme was undertaken by
Poseidon Geophysics (Pty) Ltd utilising an Auslog Logging System using instruments calibrated at Pelindaba,
South Africa, an IAEA accepted and approved standard facility. Data was converted from raw counts per
second of natural gamma rays to eU3O8 using the calibration constant obtained from measurements made at the
Pelindaba calibration borehole. Poseidon Geophysics carried out regular checks to validate the accuracy of
probe data using a test hole, BNR14, located on site. Uranium mineralisation grades through this report
annotated with a sub-prefix 'e' have been reported as uranium equivalent grades derived from down-hole
gamma ray logging results and should be regarded as approximations only.
Murchison United N.L
Murchison United Nl (LSE:MUU)
Gráfico Histórico do Ativo
De Nov 2024 até Dez 2024
Murchison United Nl (LSE:MUU)
Gráfico Histórico do Ativo
De Dez 2023 até Dez 2024
