Geology

The Télimélé project is a typical laterite bauxite type with mineralisation confined to limits of levelled surface of plateaux (bowes) above the water table that control mineralisation.

The main features of such deposits, which define the appropriate exploration methods, are:

  • Sub-horizontal and sub-conformable (to topographic surface` position of bauxite horizon;
  • Large size of mineralized bodies in plan view with considerable continuous strike extent;
  • Spotty distribution of bauxite with higher quality (>45% Al2O3) due to sporadic appearance of gelified bauxite;
  • Low variable laterite horizon thicknesses with higher variable thicknesses of bauxite;
  • Generally low variability of grades in plan and high variability in vertical dimension (zonality of laterite crusts); and
  • The lithological and geomorphological control of distribution of bauxite.



On the Télimélé project the drill holes are typically up to 23m deep. The mineralised horizons are close to horizontal, so all drilling is vertical.



Telimele_English_Resources_Final Report.jpg
Geological Map of the Telimele Bauxite Project


There were several stages of exploration of the Project. The stages prior to 2010 were before EAR’s involvement in the Project (Mamedov et al., 2012):



The 2011 auger drilling programme at Télimélé was carried out from the end of April 2011 to the beginning of July 2011 with the purpose of defining the extent of the bauxite. Drilling was carried out on a 600×600 m grid covering 21 bowes.
The next stage of exploration focused on the western part of the Télimélé licence. It began in November 2011 and finished in May 2012, with the intention of infilling the bowes previously not drilled to a 600×600 m grid and upgrading other bowes to 300×300 m. The bowes identified as favourable for higher quality bauxite from the previous drill programme were infill drilled on a 150×150 m grid. In addition, five discrete areas scattered around the western half of the licence were drilled on 75×75 m grids to provide concentrated data for geostatistical analysis. 380 diamond core holes were drilled and 21 trial pits were completed at this stage.








Summary of drilling results
Type Numbers Metres Raw Samples Special Samples
Auger drill holes 9,742 124,021 123,528 N/A
Duplicate auger drill holes 16 210 206 N/A
Core drill holes 383 5,157 6,475 material composition: 192;
bulk samples: 1,772
Trial pits 24 237 Bulk: 145;
Trench: 195
Bulk density (bulk samples): 236;
Bulk density and moisture (samples): 1,169;
Geotechnical samples: 64;
Water adsorption samples: 76;
Table: Summarised sampling meters by drilling type (Mamedov et al., 2012, EAR database)




Mineral Resources

Mineral Resources are reported in accordance with the JORC-Code 2012 Edition on Mineral Resources and Ore Reserves (2012) and was completed by CSA Global under the rules of a Competent Person as defined by the JORC Code 2012 Edition.

Mineral Resources are dated at 2016.





Key Highlights:
  • Average thickness of ore body is 6-8 meters, with practically no overburden, except for topsoil
  • Average silica — 2%, reactive silica — 1.1%
  • Bauxite composition: gibbsite (60.89%), goethite (19.66%), hematite (9.20%), kaolinite (2.32%), illite (1.95%), rutile (1.39%), quartz (0.82%), anatase (0.57%), with 3.20% amorphous material
  • The ore is amenable to low temperature Bayer process




JORC Mineral Resources by CSA Global
Resources

35% Al2O3 cut-off

40% Al2O3 cut-off
Tonnage (mt) Al2O3(%) SiO2(%) Tonnage (mt) Al2O3(%) SiO2(%)
Measured 1,781 40.53 2.16 839 43.7 2.15
Indicated 2,259 40.48 2.10 1,019 43.7 1.19
Sub-Total 4,040 40.48 2.10 1,858 43.7 2.06
Inferred 946 38.96 2.14 221 43.0 2.06
Total 4,986 40.19 2.11 2.079 43.6 2.06

— Mineral Resources based on dry bulk density of 1.91 t/m3;
— Measured Mineral Resources based on regular exploration drilling density of 150×150m;
— Indicated Mineral Resources based on regular exploration drilling density up to 300×300m;
— Inferred Mineral Resources are based on exploration drilling density up to 600×600m;
— Rows and columns may not add up exactly due to rounding.