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Navasota Outlines Bauxite Resources of 343 Million Tonnes Indicated and 63 Million Tonnes Inferred at Koba Project, Guinea
Navasota Resources Ltd. (TSX-V : NAV) is pleased to report initial bauxite resources for the Koba Bauxite Project located in the Boke Bauxite Belt of northwestern Guinea, West Africa. Total Indicated resources are estimated at 343,183,000 tonnes averaging 42.78% Al2O3, 2.85% SiO2, and 27.83% Fe2O3 (Table 1), and an additional 63,342,000 tonnes averaging 43.81% Al2O3, 2.74% SiO2, and 26.76% Fe2O3 classified as Inferred resources (Table 2). Scott Wilson Roscoe Postle Associates Inc. (SWRPA), part of the Scott Wilson Mining Group, completed the resource study, which conforms to Canadian National Instrument 43-101, Standards of Disclosure for Mineral Projects.
Table 1: Indicated Bauxite Resources, Koba Bauxite Project
Plateau |
Tonnage |
Al2O3 (%) |
Fe2O3 (%) |
SiO2 (%) |
TiO2 (%) |
CaO (%) |
MgO (%) |
Eastern Plateaus |
|
|
|
|
|
|
|
Farenya |
32,020,000 |
41.28 |
29.49 |
2.93 |
3.01 |
0.01 |
0.04 |
Madina Diang+Tito |
100,836,000 |
41.65 |
29.53 |
2.69 |
2.57 |
0.01 |
0.04 |
Nomo |
120,553,000 |
43.58 |
26.77 |
2.74 |
2.29 |
0.01 |
0.03 |
Ouda |
43,411,000 |
43.73 |
26.86 |
2.84 |
2.20 |
0.01 |
0.02 |
Western Plateaus |
|
|
|
|
|
|
|
Foye |
14,802,000 |
42.58 |
26.94 |
3.72 |
2.08 |
0.01 |
0.03 |
Kouraidendeli |
31,561,000 |
43.62 |
26.52 |
3.33 |
2.07 |
0.02 |
0.03 |
TOTAL |
343,183,000 |
42.78 |
27.83 |
2.85 |
2.40 |
0.01 |
0.03 |
Table 2: Inferred Bauxite Resources, Koba Bauxite Project
Plateau |
Tonnage |
Al2O3 (%) |
Fe2O3 (%) |
SiO2 (%) |
TiO2 (%) |
CaO (%) |
MgO (%) |
Western Plateaus |
|
|
|
|
|
|
|
Fakkerefonye |
31,970,000 |
44.87 |
25.08 |
2.82 |
2.50 |
0.01 |
0.03 |
Killikocco |
7,944,000 |
41.41 |
30.19 |
2.54 |
2.73 |
0.02 |
0.02 |
Ore Pousse 1 |
1,137,000 |
41.33 |
30.27 |
2.79 |
1.91 |
0.02 |
0.03 |
Ore Pousse 2 |
7,439,000 |
44.18 |
26.33 |
2.87 |
2.32 |
0.02 |
0.04 |
Touguiwel Competa |
14,852,000 |
42.84 |
28.49 |
2.63 |
2.29 |
0.01 |
0.05 |
TOTAL |
63,342,000 |
43.81 |
26.76 |
2.74 |
2.44 |
0.01 |
0.03 |
Mineral resources were estimated using cut-off grades of >35% Al2O3, <35% Fe2O3, <6% SiO2, <5% TiO2, <0.2% CaO, <0.2% MgO, and Al2O3/SiO2 >10. A minimum mining thickness of 2 metres and a maximum stripping ratio of 3:1, waste: ore were also used in the estimation process. Resources are classified as Indicated based on hole spacings of 150 metres. Inferred resources are based on drill hole spacings up to 300 metres. CIM definitions were followed for the Mineral Resource estimate.
Resource estimation utilized much of the drill hole database of 36,759 metres in 2,147 drill holes in two phases of aircore drilling over 26 bauxitic plateaus. Only results available prior to October 31, 2008 were included. As a result, only 58% of the holes from Kouraidendeli Plateau, 82% from Nomo, and 0% from Sapi are included in the estimate. No resources are included from the Central Plateaus as the density of drilling is currently insufficient to establish continuity of the bauxite intervals. In addition, no estimates have been made for the plateaus located in the north part of the Gaoual Permit as assay results are pending. Once outstanding results become available, mineral resource estimates will be updated and preliminary economic assessments initiated.
Phase 1 drilling was designed to confirm the presence of bauxite mineralization on 26 target "plateaus" identified through Aster satellite imagery analyses. This initial phase of drilling totalled 10,666 metres and consisted of 558 shallow holes at 300 and 600-metre hole spacings. Phase 2 drilling, totalling 26,093 metres in 1,589 holes, reduced the drill spacing to 150-metres on 12 plateaus previously covered by Phase 1 drilling. Phase 2 drilling allowed SWRPA to determine the continuity of bauxite mineralization, grade and thickness variability; necessary parameters for resource modelling.
Table 3 Summary of Drilling, Koba Bauxite Project
Plateau |
PHASE 1 |
PHASE 2 |
AC Holes |
Drill Metres |
AC Holes |
Drill Metres |
Eastern Plateaus |
|
|
|
|
Madina Diang |
24 |
570 |
269 |
4,702 |
Tito |
18 |
438 |
|
|
Nomo |
40 |
917 |
418 |
7,105 |
Ouda |
13 |
298 |
101 |
1,962 |
Farenya |
26 |
499 |
117 |
1,839 |
Maniega |
- |
- |
- |
- |
Akounedjande |
14 |
174 |
|
|
Central Plateaus |
|
|
|
|
Kaoulak |
18 |
329 |
|
|
Horefilo |
13 |
247 |
|
|
Fillo |
8 |
165 |
|
|
Kendaya |
12 |
239 |
|
|
Bounna |
17 |
279 |
|
|
Kounsitokhe |
15 |
254 |
43 |
601 |
Dounoama |
13 |
212 |
|
|
Lakhorde |
15 |
244 |
59 |
822 |
Tenkele |
25 |
441 |
68 |
976 |
Northeastern Plateaus |
|
|
|
|
Kouraidendeli |
111 |
2,077 |
320 |
5,094 |
Touguiwel Competa |
11 |
259 |
|
|
Killikocco |
8 |
165 |
|
|
Fakkerefonye |
25 |
559 |
|
|
Northwestern Plateaus |
|
|
|
|
Ore Pousse 1 |
7 |
103 |
|
|
Ore Pousse 2 |
8 |
155 |
|
|
Sapi North |
10 |
163 |
37 |
557 |
Sapi South |
14 |
246 |
58 |
933 |
Foye |
30 |
505 |
99 |
1,502 |
Gaoual North Plateaus |
|
|
|
|
Kounsidji |
57 |
1,026 |
|
|
Bhoundoutchale |
6 |
102 |
|
|
TOTALS |
558 |
10,666 |
1,589 |
26,093 |
GRAND TOTAL |
|
2,147 |
36,759 |
Technical Studies Initiated
Navasota has retained SWRPA to perform a high-level preliminary environmental and social review of the Koba Bauxite Project in Guinea. This process included a review of existing data, site visit, and report identifying both social and environmental issues to be addressed prior to project development. A SWRPA team recently completed the data review and site visit.
An average bulk density of 2.346 was derived from 10 representative samples collected from freshly dug pits on Nomo and Madina Diang plateaus. This bulk density value is higher than typically encountered in Guinea due to the relatively high iron content of the bauxite. Coffey Mining is currently on-site overseeing the collection of additional samples for bulk density and metallurgical studies. The program consists of excavating a series of pits on several plateaus to collect a broad suite of samples representing the different varieties of bauxite comprising the Koba resource.
General Information
Navasota has the right to earn a 100% interest in the "AMIG" permits, which cover 1,064 square kilometres in the Télimélé and Gaoual prefectures of Guinea. These permit areas are located in the Boke Bauxite Belt, which hosts the world's largest and highest-quality bauxite deposits, and are directly surrounded by several of the world's major bauxite miners.
Koba bauxite deposits are predominantly "blanket-type" and fall within the Gaoual deposit group of the Boke-Gaoual Bauxite District. The bauxite is primarily residual in nature, gibbsitic in composition, and containing 40-50% Al2O3 and 1-3% SiO2. Gibbsite is the most desirable aluminum hydroxide species as it can be processed at substantially lower temperatures than either boehmite or diaspore. The bauxite horizon is typically 5 -- 8 metres thick but locally may reach 15 -- 20 metres thickness.
Don Hains, P.Geo., Associate Consultant with SWRPA, and Christopher J. Wild, P.Eng., Vice-President Exploration with Navasota Resources Ltd., both Qualified Persons as defined by Canadian National Instrument 43-101, have reviewed and approved the technical disclosure contained in this news release.
For more information on Navasota and the Koba Bauxite Project, please visit www.navasota.com or contact Kyle Stevenson of Stevenson & Associates IR at 604-687-1779.
On behalf of the Board of Directors
Navasota Resources Ltd.
Signed
James T. Gillis, President & CEO
Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this news release.
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