Murchison United N.L
AIM : MUU
ASX : MUR

March 26, 2008 03:15 ET

Final Downhole Logging Results from Bir En Nar in Mauritania

WEST PERTH, WESTERN AUSTRALIA--(Marketwire - March 26, 2008) - Murchison United NL (ASX:MUR)(AIM:MUU) -

Highlights

- Further high-grade uranium intersections indicated from final downhole radiometric logging results from RC drilling at the Bir En Nar uranium prospect (Zednes Region, Mauritania).

- Best intercepts identified included:



Drill Hole Section Intersection eU3O8
RC From (m) Thickness (m) (ppm)
---------- ------- ------------ ------
BNR02 58.30 0.70 5,750
BNR04 6.25 1.00 7,180
BNR08 70.80 2.35 (ii) 11,250
" " 87.45 1.55 5,060
BNR11 85.35 1.55 (ii) 18,280
" " 114.20 5.35 9,310
BNR14 33.35 2.90 6,100
BNR21 46.05 0.95 5,500
BNR41 26.15 0.30 5,100
" " 28.25 0.35 8,140


- Assay results expected shortly and will be released when received.

Drillhole Radiometric Logging Results - Mauritania

Murchison United NL (ASX:MUR)(AIM:MUU)("Murchison") is pleased to announce that it has now received the final downhole radiometric logging results, including further significant high-grade results 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).

This drilling programme was carried out during December 2007 by AMCO Construction under the supervision of Murchison's Technical Director, Bosse Gustafsson (see Fig. 1). The programme consisted of 41 RC drill holes of 50 to 150 metres in length for a total of 4,006m. Further details of the drill holes are provided in Appendix 2 at the end of this announcement.

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 50 degrees, 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).


Fig.1 Drilling in Mauritania, December 2007 (to view image, please open the following link in a new window):

http://media3.marketwire.com/docs/murchisonfig1.pdf

26 of the 38 holes tested returned intercepts calculated at greater than 1,000ppm eU3O8. Seven holes contained intercepts exceeding 5,000ppm eU3O8, with a maximum intercept of 1.55m at 18,280ppm eU3O8. Murchison considers these results to be very encouraging and confirm the prospectivity for uranium mineralisation.

A table containing full results from the radiometric logging is shown as Appendix 1 at the end of this announcement.

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.

Fig.2 Bir En Nar 2007 drilling program, locations of first eight holes (to view image, please open the following link in a new window):

http://media3.marketwire.com/docs/murchisonfig2birennar.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.

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.

Fig.3 Location of Murchison United's exploration permits in Mauritania (to view image, please open the following link in a new window):

http://media3.marketwire.com/docs/murchisonfig3explorationpermitsMauritania.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 downhole logging results attained 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 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

Murchison's Nominated Advisor for the AIM market is RFC Corporate Finance Ltd.

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.

APPENDIX 1

Complete radiometric logging results received from initial drilling at the Bir En Nar Prospect:



----------------------------------------------------------------
Drill Hole Length of Section Intersection eU3O8
RC Hole (m) From (m) Thickness (m) (ppm)
---------- -------- ------- ------------ ------
----------------------------------------------------------------
BNR01 77 4.60 0.65 540
----------------------------------------------------------------
BNR02 109 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 79 No anomaly
----------------------------------------------------------------
BNR04 48 6.25 1.00 7,180
----------------------------------------------------------------
BNR05 111 40.20 3.85 3,400
----------------------------------------------------------------
BNR06 98 91.60 4.00 580
----------------------------------------------------------------
BNR07 49 24.40 2.15 2,510
----------------------------------------------------------------
" " 33.40 1.75 640
----------------------------------------------------------------
" " 39.70 0.55 660
----------------------------------------------------------------
" " 44.95 0.35 1,270
----------------------------------------------------------------
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
----------------------------------------------------------------
BNR09 148 124.85 2.10 1,420
----------------------------------------------------------------
BNR10 79 No anomaly
----------------------------------------------------------------
BNR11 125 85.35 1.55 18,280
----------------------------------------------------------------
" " 90.35 1.00 630
----------------------------------------------------------------
" " 92.35 0.85 660
----------------------------------------------------------------
" " 114.20 5.35 9,310
----------------------------------------------------------------
BNR12 149 84.45 0.35 4,300
----------------------------------------------------------------
BNR13 109 75.40 1.05 650
----------------------------------------------------------------
" " 79.45 0.75 500
----------------------------------------------------------------
" " 91.20 0.35 490
----------------------------------------------------------------
" " 92.55 1.40 570
----------------------------------------------------------------
" " 98.95 2.00 620
----------------------------------------------------------------
BNR14 77 29.10 0.45 570
----------------------------------------------------------------
" " 33.35 2.90 6,100
----------------------------------------------------------------
BNR15 99 0.85 0.30 3,410
----------------------------------------------------------------
" " 77.40 0.95 3,950
----------------------------------------------------------------
" " 80.65 0.60 820
----------------------------------------------------------------
" " 95.70 1.20 490
----------------------------------------------------------------
BNR16 148 No anomaly
----------------------------------------------------------------
BNR17 79 47.75 0.20 450
----------------------------------------------------------------
" " 49.10 0.80 230
----------------------------------------------------------------
BNR18 49 19.40 1.20 850
----------------------------------------------------------------
" " 21.70 0.25 970
----------------------------------------------------------------
BNR19 99 60.50 0.40 1,740
----------------------------------------------------------------
BNR20 71 49.15 1.05 2,070
----------------------------------------------------------------
" " 54.00 0.35 1,240
----------------------------------------------------------------
" " 55.70 1.40 550
----------------------------------------------------------------
" " 65.60 0.35 1,320
----------------------------------------------------------------
BNR21 97 21.05 0.45 940
----------------------------------------------------------------
" " 24.15 4.60 3,510
----------------------------------------------------------------
" " 46.05 0.95 5,500
----------------------------------------------------------------
" " 47.75 0.30 2,950
----------------------------------------------------------------
BNR22 Hole blocked
----------------------------------------------------------------
BNR23 98 No anomaly
----------------------------------------------------------------
BNR24 Hole blocked
----------------------------------------------------------------
BNR25 97 80.60 0.45 950
----------------------------------------------------------------
BNR26 99 No anomaly
----------------------------------------------------------------
BNR27 99 49.75 0.45 1,750
----------------------------------------------------------------
" " 52.70 0.35 2,430
----------------------------------------------------------------
BNR28 99 50.30 1.25 1,480
----------------------------------------------------------------
BNR29 97 46.2 0.65 1,860
----------------------------------------------------------------
BNR30 98 44.35 2.05 1,130
----------------------------------------------------------------
BNR31 99 25.70 1.30 2,040
----------------------------------------------------------------
BNR32 98 28.10 0.45 830
----------------------------------------------------------------
" " 30.15 0.30 1,080
----------------------------------------------------------------
" " 31.65 1.90 3,990
----------------------------------------------------------------
BNR33 119 12.70 0.55 1,450
----------------------------------------------------------------
" " 13.80 0.30 1,700
----------------------------------------------------------------
" " 18.35 0.90 1,040
----------------------------------------------------------------
" " 84.55 0.55 710
----------------------------------------------------------------
BNR34 98 No anomaly
----------------------------------------------------------------
BNR35 99 37.95 0.30 3,790
----------------------------------------------------------------
" " 46.60 0.25 2,580
----------------------------------------------------------------
BNR36 78 38.65 0.35 2,360
----------------------------------------------------------------
" " 41.90 0.20 550
----------------------------------------------------------------
" " 77.80 0.35 630
----------------------------------------------------------------
BNR37 98 85.45 1.70 2,180
----------------------------------------------------------------
BNR38 48 24.85 1.10 970
----------------------------------------------------------------
" " 37.00 0.25 930
----------------------------------------------------------------
BNR39 149 74.95 0.75 4,480
----------------------------------------------------------------
" " 110.20 1.30 700
----------------------------------------------------------------
BNR40 Hole blocked
----------------------------------------------------------------
BNR41 59 14.30 0.25 820
----------------------------------------------------------------
" " 19.90 1.50 910
----------------------------------------------------------------
" " 23.45 0.65 1,420
----------------------------------------------------------------
" " 26.15 0.30 5,100
----------------------------------------------------------------
" " 28.25 0.35 8,140
----------------------------------------------------------------


APPENDIX 2 - Drilling Programme

This initial drilling program consisted of 41 holes for a total of 4,006m of RC drilling. The holes were drilled to between 50m and 150m. Further details of the drill holes are contained in the following table:



---------------------------------------------------------------------
Hole East North Inclination (deg) Bearing Length (m)
---------------------------------------------------------------------
BNR 01 360750 2661050 50 SW 80
---------------------------------------------------------------------
BNR 02 360800 2661100 50 SW 109
---------------------------------------------------------------------
BNR 03 360700 2661000 50 NE 80
---------------------------------------------------------------------
BNR 04 360700 2661100 50 SW 50
---------------------------------------------------------------------
BNR 05 360750 2661150 50 SW 114
---------------------------------------------------------------------
BNR 06 360775 2661175 50 SW 101
---------------------------------------------------------------------
BNR 07 360800 2661000 50 SW 50
---------------------------------------------------------------------
BNR 08 360850 2661050 50 SW 100
---------------------------------------------------------------------
BNR 09 360900 2661100 50 SW 150
---------------------------------------------------------------------
BNR 10 360850 2660950 50 SW 80
---------------------------------------------------------------------
BNR 11 360900 2661000 50 SW 126
---------------------------------------------------------------------
BNR 12 360950 2661050 50 SW 150
---------------------------------------------------------------------
BNR 13 360950 2660950 50 SW 110
---------------------------------------------------------------------
BNR 14 360975 2660975 50 SW 78
---------------------------------------------------------------------
BNR 15 361000 2660900 50 SW 100
---------------------------------------------------------------------
BNR 16 361050 2660950 50 SW 150
---------------------------------------------------------------------
BNR 17 361025 2660825 50 NE 80
---------------------------------------------------------------------
BNR 18 361037 2660837 50 NE 50
---------------------------------------------------------------------
BNR 19 361200 2660700 50 SW 100
---------------------------------------------------------------------
BNR 20 361250 2660650 50 SW 90
---------------------------------------------------------------------
BNR 21 360850 2660650 50 SW 100
---------------------------------------------------------------------
BNR 22 361287 2660587 50 SW 100
---------------------------------------------------------------------
BNR 23 361337 2660537 50 SW 100
---------------------------------------------------------------------
BNR 24 361400 2660500 50 SW 100
---------------------------------------------------------------------
BNR 25 361450 2660450 50 SW 100
---------------------------------------------------------------------
BNR 26 361500 2660400 50 SW 100
---------------------------------------------------------------------
BNR 27 360962 2660562 50 SW 100
---------------------------------------------------------------------
BNR 28 361000 2660600 50 SW 100
---------------------------------------------------------------------
BNR 29 360912 2660612 50 SW 100
---------------------------------------------------------------------
BNR 30 360800 2660700 50 SW 100
---------------------------------------------------------------------
BNR 31 361037 2660537 50 SW 100
---------------------------------------------------------------------
BNR 32 361000 2660500 50 SW 100
---------------------------------------------------------------------
BNR 33 360950 2660850 50 NE 120
---------------------------------------------------------------------
BNR 34 361050 2660450 50 SW 100
---------------------------------------------------------------------
BNR 35 360700 2661200 50 SW 100
---------------------------------------------------------------------
BNR 36 360625 2661225 50 SW 80
---------------------------------------------------------------------
BNR 37 360825 2661125 50 SW 100
---------------------------------------------------------------------
BNR 38 360650 2661150 50 SW 50
---------------------------------------------------------------------
BNR 39 360987 2660987 50 SW 150
---------------------------------------------------------------------
BNR 40 360650 2661250 50 SW 100
---------------------------------------------------------------------
BNR 41 360800 2661000 45 NE 60
---------------------------------------------------------------------


ACN 009 087 852

Contact Information

  • Stuart Laing
    +618 9480 2506