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The Yaramoko Project consists of a single permit, in the Houndé greenstone belt in the western part of the country. It is located directly south of Semafo's Mana Gold Mine, which started production in 2008. Semafo has reported 902,900 ounces of proven and probable gold reserves, plus an additional 301,700 ounces of measured and indicated and 444,800 ounces of inferred gold resources. The Mana Mine is being developed on a series of high-grade gold veins, similar to those at Riverstone's Yaramoko permit.
The company has defined an 8 km long deformation zone on Yaramoko which appears to be the continuation of the mineralized zones at Mana. It contains at least 12 artisanal gold mining sites, and sampling by the company has returned some very high gold values. A 2,000 m RC drilling program was completed at Yaramoko in November 2007 with encouraging results including a 14 metre thick intersection of 2.04 g/t gold in Hole 015 and 6.0 metres of 11.88 g/t gold in Hole 022, confirming the high-grade gold nature of a series of quartz veins that have been traced on surface for approximately 6 kilometres. Selected results are shown in the table.
| Hole # |
From
(metres) |
To
(metres) |
Hole Interval
(metres) |
Grade
(g/t Au) |
|
| YRM-07-RC-003 |
54 |
58 |
4 |
3.43 |
|
| YRM-07-RC-005 |
128 |
130 |
2 |
1.91 |
|
| YRM-07-RC-006 |
110 |
116 |
6 |
1.58 |
|
| YRM-07-RC-010 |
38 |
42 |
4 |
3.18 |
|
| YRM-07-RC-015 |
50 |
64 |
14 |
2.04 |
|
| YRM-07-RC-017 |
42 |
44 |
2 |
14.82 |
|
| YRM-07-RC-018 |
82 |
90 |
8 |
1.93 |
|
| YRM-07-RC-019 |
0 |
2 |
2 |
1.46 |
| and including |
64 |
66 |
2 |
2.10 |
|
| YRM-07-RC-020 |
30 |
32 |
2 |
1.09 |
| and including |
42 |
48 |
6 |
1.56 |
|
| YRM-07-RC-021 |
44 |
46 |
2 |
1.36 |
| and including |
56 |
60 |
4 |
4.30 |
|
| YRM-07-RC-022 |
8 |
10 |
2 |
3.46 |
| and including |
58 |
64 |
6 |
11.88 |
The Yaramoko permit is 224 square km in size, and like Ligidi, it too contains Tarkwaiian sedimentary rocks. Work by Riverstone since late in 2005 has concentrated on soil sampling, geological mapping and rock sampling. The soil sampling has outlined a 3.5 km long by 500 m wide gold-in-soils geochemical. Rock samples taken from throughout the permit have returned significant results, including 16 samples with gold values ranging from 1.0 to 11.9 g/t. Selected results are listed in the following table.
| Sample No. |
Grams/tonne Gold |
|
| 16048 |
11.86 |
|
| 16028 |
11.52 |
|
| YRAO-01 |
8.48 |
|
| 16027 |
6.80 |
|
| 16180 |
5.78 |
|
| RT-154 |
5.46 |
|
| 16054 |
4.19 |
|
| 16029 |
3.18 |
|
| 16058 |
2.86 |
|
| 16111 |
2.53 |
|
| 16191 |
2.15 |
|
| YRAO-13 |
1.85 |
|
| JMYB-02 |
1.70 |
|
| 16110 |
1.52 |
|
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