Navasota Drills Up to 57.4% Alumina at Koba Bauxite Project


Navasota Resources Ltd. (TSX-V : NAV) is pleased to report additional results from the Télimélé and Gaoual ("AMIG") permits of its Koba Project located in the Boke Bauxite Belt of northwestern Guinea, West Africa. At Kouraidendeli Plateau, 108 of 111 Phase 1 drill holes intersected bauxite mineralization having a weighted average grade of 43.41% Al2O3 and 2.56% SiO2 over an average thickness of 5.75 metres. In addition, Phase 2 drilling is now complete.

Navasota has now completed a total of 36,759 metres in 2,147 drill holes in two phases of aircore drilling on its Koba Bauxite Project. Resource modelling and estimation work have commenced.

Phase 1 Drilling Summary

Phase 1 drilling was designed to confirm the presence of bauxite mineralization on 25 target "plateaus" identified through Aster satellite imagery analyses. This drilling totalled 10,666 metres and consisted of 558 shallow holes at 300 and 600-metre hole spacings. Most assay results from the Phase 1 drill program have been received and results from 19 remaining plateaus will be released after they are composited.

To date, Phase 1 drill results are summarized in Table 1. It should be noted that bauxite intervals for Madina Diang (Tito) and Nomo were determined utilizing a 35% Al2O3 (alumina) cut-off and maximum 3-metre internal dilution. The figures for Ouda and Farenya added a 6% SiO2 (silica) cap, eliminating several high-silica samples from the margins of the bauxite intervals, thereby decreasing the overall silica and increasing the alumina.

Table 1 - Summary* of Phase 1 Results, Koba Bauxite Project

* For results released to date on 6 of 25 plateaus
** Tito Plateau assay results are incorporated into Madina Diang Plateau

Phase 2 Drilling Summary

Phase 2 drilling reduced the drill spacing to 150-metres on 12 plateaus previously covered by Phase 1 drilling. Such Phase 2 drilling will allow Navasota to determine bauxite mineralization continuity, grade and thickness variability; all necessary parameters for resource modelling. This in-fill drill program began in late January and covered the largest and most continuous bauxite plateaus identified during Phase 1 drilling. A total of 26,093 metres in 1,589 in-fill holes were completed.

Plateaus were selected for in-fill drilling based on Phase 1 results, when available, and observed thicknesses of bauxite noted during logging of drill cuttings by project geologists. During this preliminary assessment, three principal areas stood out; the Eastern Plateaus, particularly Nomo and Ouda plateaus, the Northeastern Plateaus, particularly Kouraidendeli, and the Northwestern Plateaus, notably Sapi and Foye.

Kouraidendeli Plateau

Selected composite assay results from the 111 Phase 1 drill holes (at 300-metre spacings) completed at the large Kouraidendeli Plateau are listed in Table 2. These results confirm the presence of an extensive bauxitic plateau with alumina and silica assay results similar to those from the nearby Eastern plateaus of Madina Diang (including Tito), Nomo, Ouda, and Farenya. The 108 bauxitic intervals on Kouraidendeli Plateau have weighted average grades of 43.41% Al2O3 and 2.56% SiO2 over an average 5.75-metre thickness, using 35% Al2O3 and 6% SiO2 cut-off grades.

Drill hole location maps can be found on the Navasota website.

Table 2 - Selected Assay Results from Kouraidendeli Plateau