October 10, 2007

Encouraging Diamond Results from Tongo Project in Sierra Leone

Mano River Resources Inc. (“Mano” or “the Company”), the TSX-V and AIM-listed exploration and development company focussed on West Africa is pleased to announce encouraging initial diamond recoveries from the Tongo kimberlite project in eastern Sierra Leone. The Tongo project is a Joint Venture between Mano’s 68.5% owned subsidiary company, Stellar Diamonds Limited (“Stellar”) and BHP Billiton. BHP Billiton can earn up to a 51% interest in the Tongo project under the current spending plan of $3.4million, with a further option to earn up to 70%.

Highlights of the initial recoveries are:

  • 1,894 diamonds, totalling 2.05 carats, recovered from six 200 kg (dry weight) samples, including
  • 49 diamonds over 0.85mm recovered, totalling 1.43 carats
  • 72 diamonds, totalling 2.85 carats, recovered from 23 surface grab samples

Stellar’s CEO, Karl Smithson, commented:

“We are extremely pleased with these results and consider the significant number of diamonds recovered to be a promising indicator of potential grade. Additionally, the presence of diamonds in the plus 0.85mm size fraction from these small samples is particularly encouraging. With our partners, BHP Billiton, we are now undertaking a 1,200m drilling programme aimed at locating any potential kimberlite pipes or blows associated with the dykes and look forward to providing an update in due course.”

Four kimberlite dykes have been mapped and trenched at various points along strike by Stellar on the 33km2 Tongo project, which is a retained area from the original 9,700km2 Reconnaissance Exclusive Prospecting Licence. The dykes in the licence area currently range in strike length from 0.5km to 2km and range in width from a few centimetres up to 1m. Tongo is located 35km south of the Kono Joint Venture between Stellar and Petra Diamonds where underground test diamond mining is underway.

Six 200kg (dry weight) samples were collected from the Tongo trenches and consigned to the SGS Lakefield Research Africa laboratory (“SGS”) (non ISO compliant) in Johannesburg, South Africa for total diamond liberation by caustic dissolution.

Some 1,894 diamonds weighing a total of 2.05 carats were recovered. The full results are shown in Table 1. All six samples yielded a significant number of diamonds, many in excess of 0.85mm (i.e. ‘DTC sieve size 1’). The highest number of diamonds recovered from a single sample was 756 diamonds (totalling 0.317-carats) from Dyke 3 (sample JV-2527). However, the most carats from a single sample (0.534-carats) were recovered from Dyke 1 (sample JV-2525). The largest diamond recovered was a white octahedral stone weighing 0.31-carats (Dyke 1 sample JV-2525). The SGS laboratory described the majority of the diamonds as white, transparent or translucent, dodecahedrons, octahedrons or fragments. A number of these diamonds show perfect or near perfect preservation and exhibit octahedral form.

In addition to the six samples submitted for caustic dissolution, Stellar also collected 23 surface grab samples from the four dykes. These samples ranged in wet weight from 20 kg to 1,200 kg, and were processed in-field by washing and manual concentrating to produce a greater than 0.3 mm mesh sized concentrate. Diamonds were recovered from the concentrates using a binocular microscope in the kimberlite indicator mineral laboratory established by Stellar in Monrovia, Liberia. Some 72 diamonds, weighing 2.85-carats, were recovered from 22 of the 23 samples collected and processed. The full results are shown in Table 2.

Table 1

Summary of the Caustic Dissolution Results for the Stellar Diamonds Limited – BHP Billiton Joint Venture, Tongo Project, Sierra Leone. Each represents a 200kg (dry weight) sample.

JV- 2447 Tongo Dyke 1

Sieve Size
(mm square mesh)
Number
of diamonds
Weight of
Diamonds (carats)
>9.50 0 0
6.70 to 9.50 0 0
4.75 to 6.7 0 0
3.35 to 4.75 0 0
2.36 to 3.35 0 0
1.70 to 2.36 0 0
1.18 to 1.70 2 0.0984465
0.85 to 1.18 3 0.0297690
0.600 to 0.850 8 0.0336491
0.425 to 0.600 21 0.0343500
0.300 to 0.425 44 0.0229640
0.212 to 0.300 35 0.0070445
0.150 to 0.212 73 0.0071115
0.106 to 0.150 53 0.0013330
0.075 to 0.106 28 0.0002525
Total 267 0.2349201
Total >0.85 5 0.1282155
JV- 2525 Tongo Dyke 1

Sieve Size
(mm square mesh)
Number
of diamonds
Weight of
Diamonds (carats)
>9.50 0 0
6.70 to 9.50 0 0
4.75 to 6.7 0 0
3.35 to 4.75 0 0
2.36 to 3.35 1 0.3102525
1.70 to 2.36 0 0
1.18 to 1.70 5 0.1263540
0.85 to 1.18 2 0.0192740
0.600 to 0.850 9 0.0326575
0.425 to 0.600 11 0.0173515
0.300 to 0.425 26 0.0130395
0.212 to 0.300 41 0.0082375
0.150 to 0.212 55 0.0038245
0.106 to 0.150 62 0.0018360
0.075 to 0.106 36 0.0006450
Total 248 0.5334720
Total >0.85 8 0.4558805
JV-2448 Tongo Dyke 2

Sieve Size
(mm square mesh)
Number
of diamonds
Weight of
Diamonds (carats)
>9.50 0 0
6.70 to 9.50 0 0
4.75 to 6.7 0 0
3.35 to 4.75 0 0
2.36 to 3.35 0 0
1.70 to 2.36 1 0.0712690
1.18 to 1.70 3 0.1160940
0.85 to 1.18 2 0.0233875
0.600 to 0.850 12 0.0531935
0.425 to 0.600 19 0.0279135
0.300 to 0.425 30 0.0148490
0.212 to 0.300 59 0.0106520
0.150 to 0.212 118 0.0066650
0.106 to 0.150 60 0.0014350
0.075 to 0.106 41 0.0005950
Total 345 0.3260535
Total >0.85 6 0.2107505
JV-2527 Tongo Dyke 3

Sieve Size
(mm square mesh)
Number
of diamonds
Weight of
Diamonds (carats)
>9.50 0 0
6.70 to 9.50 0 0
4.75 to 6.7 0 0
3.35 to 4.75 0 0
2.36 to 3.35 0 0
1.70 to 2.36 1 0.0790750
1.18 to 1.70 5 0.1674805
0.85 to 1.18 7 0.0704790
0.600 to 0.850 22 0.0864705
0.425 to 0.600 58 0.0817730
0.300 to 0.425 82 0.0354835
0.212 to 0.300 119 0.0203180
0.150 to 0.212 190 0.0134695
0.106 to 0.150 204 0.0052150
0.075 to 0.106 68 0.0007225
Total 756 0.5604865
Total >0.85 13 0.3170345
JV-2446 Tongo Dyke 4

Sieve Size
(mm square mesh)
Number
of diamonds
Weight of
Diamonds (carats)
>9.50 0 0
6.70 to 9.50 0 0
4.75 to 6.7 0 0
3.35 to 4.75 0 0
2.36 to 3.35 0 0
1.70 to 2.36 0 0
1.18 to 1.70 1 0.0384845
0.85 to 1.18 3 0.0417240
0.600 to 0.850 1 0.0037535
0.425 to 0.600 2 0.0013575
0.300 to 0.425 10 0.0054435
0.212 to 0.300 21 0.0047045
0.150 to 0.212 19 0.0016500
0.106 to 0.150 18 0.0005950
0.075 to 0.106 6 0.0000800
Total 81 0.0977925
Total >0.85 4 0.0802085
JV-2505 Tongo Dyke 4

Sieve Size
(mm square mesh)
Number
of diamonds
Weight of
Diamonds (carats)
>9.50 0 0
6.70 to 9.50 0 0
4.75 to 6.7 0 0
3.35 to 4.75 0 0
2.36 to 3.35 0 0
1.70 to 2.36 2 0.1107165
1.18 to 1.70 1 0.0222685
0.85 to 1.18 10 0.1094660
0.600 to 0.850 3 0.0131115
0.425 to 0.600 16 0.0220770
0.300 to 0.425 19 0.0109820
0.212 to 0.300 36 0.0067005
0.150 to 0.212 40 0.0030150
0.106 to 0.150 52 0.0017950
0.075 to 0.106 18 0.0002665
Total 197 0.3003985
Total >0.85 13 0.2424510

Table 2

Summary of Tongo Diamond Results
Taken from Field Grab Samples
Sample Number Dyke Wet weight (kg) Diamonds
(+0.3mm)
Carats
2446 Dyke 4 120 2 0.250
2446 Dyke 4 1,200 5 0.320
2505 Dyke 4 430 15 1.655
2528 Dyke 4 90 12 0.120
2529 Dyke 4 210 0 0.000
2530 Dyke 4 360 14 0.820
2531 Dyke 4 450 1 0.010
2532 Dyke 4 840 5 0.020
Total 3,700 54 3.195
2526 Dyke 3 60 0 0.000
2527 Dyke 3 400 2 0.150
Total 460 2 0.150
2448 Dyke 2 320 1 0.030
2504 Dyke 2 250 4 0.005
2536 Dyke 2 600 16 1.240
Total 1,170 21 1.275
2506 Dyke 1 250 9 0.210
2525 Dyke 1 1,000 15 0.850
2449 Dyke 1 20 1 not weighed
2447 Dyke 1 500 3 0.030
2506 Dyke 1 250 9 0.050
2533 Dyke 1 430 10 0.440
2534 Dyke 1 500 5 0.020
2535 Dyke 1 160 4 0.150
2537 Dyke 1 1,000 15 1.080
2538 Dyke 1 90 1 0.020
Total 4,200 72 2.850

Mano’s Qualified Person responsible for reviewing the content of this release is Karl Smithson, Executive Director and CEO of Stellar Diamonds Limited. Mr. Smithson holds BSc in Geology from Kingston University in the UK, a MBA from the Graduate School of Business, Cape Town and is a member of the South African Council for Natural Scientific Professions (as Professional Geologist).

About the laboratory procedure

At the SGS laboratory in Johannesburg, South Africa, the samples were dried and 200kg (dry weight) of each sample was subjected to total diamond liberation through caustic dissolution (4kg sample aliquots boiled at 550-deg Celsius in caustic soda for 14 hours). The fusion residues were then passed through a 90 micron sieve and the +90 micron fractions were then dried and passed to the MSA Geoservices laboratory for diamond picking. Diamonds that reported to the +0.075mm square mesh sieve size were recovered, measured (X,Y,Z axes), described and weighed. Diamonds reporting to the +0.212mm sieve size were weighed individually, whereas diamonds reporting to the -0.212mm sieve size were weighed together in their respective sieve class size.

For further information on Mano River Resources and Stellar Diamonds Limited, you are invited to visit the Company’s website at www.manoriver.com or contact:

Mano River Resources Inc
Luis da Silva, CEO +44 (0) 1235 810 740
Stellar Diamonds Limited
Karl Smithson, CEO +44 (0) 77 837 07971
Pelham PR
Charles Vivian +44 (0) 20 7743 6670
GMP Securities Europe LLP,
an Appointed Representative of Panmure Gordon ( UK) Limited
James Hannon +44 (0) 20 7459 3606
Panmure Gordon ( UK) Limited
Edward Farmer +44 (0) 20 7614 8384

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