Tamboti

 

Tamboti Project
 

Mineral Resources

The Tamboti Project is located approximately 45km south-west of Burgersfort on the eastern limb of the Bushveld Complex, down-dip of the Two Rivers Mine. Impala holds a prospecting right over 8 524ha on Buffelshoek and large portions of the farms Tweefontein and Kalkfontein. Agreements with junior resource company Kameni and with African Rainbow Minerals over these properties were recorded in the 2009 Annual Report.

Both the Merensky Reef and underlying UG2 Reef occur at the Tamboti Project. However, no Merensky Reef is present on Tweefontein and the UG2 Reef only occurs on a small portion of this farm. The vertical separation between the Merensky Reef and UG2 Reef is around 160m. The geological succession is broadly similar to other areas of the eastern limb, at the adjacent Two Rivers operation in particular. An exception is the presence of the Steelpoortpark granite in the south-western part of the project which is unique to this area.

Two distinct UG2 Reef types have been defined, namely a “normal” reef with a thick main chromitite layer and a “split” reef, characterised by an internal pyroxenite/norite lens. The Merensky Reef is the upper portion of a pyroxenite layer, with a chromitite stringer close to the contact with the hangingwall and mineralisation decreases from the chromitite stringer into the hangingwall and footwall.

   
 

The geological structure of the area is dominated by the regional north-north-east to south-south-west trending Kalkfontein fault with an apparent vertical displacement of 1 200m downthrow to the west and a lateral dextral displacement of several kilometres. In the central portions of the project area both reefs on the eastern side of the Kalkfontein fault are gently folded into a south-south-west plunging asymmetric syncline, followed by a smaller anticline to the west. Dips of the limbs vary from 10° to 31°. Further to the west of the anticline, the reefs occur at a lower level, due to the combined effects of the folding and the Buffelshoek fault.

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Tamboti Mineral Resources (100%)  
as at 30 June 2012

 Mineral Resources          as at 30 June 2012        as at 30 June 2011  
 Orebody per farm portions   Category   Tonnes  
Mt  
Width  
cm  
4E  
grade  
g/t  
6E  
grade  
g/t  
4E  
Moz  
6E  
Moz  
Pt  
Moz  
Tonnes  
Mt  
4E  
grade  
g/t  
6E  
grade  
g/t  
4E  
Moz  
Pt  
Moz  
 Kalkfontein   Merensky:   Portions  
1 – 3  
Inferred   58.0   113   3.43   3.70   6.4   6.9   3.8   58.0   3.43   3.70   6.4   3.8  
  Merensky:   Portions  
4 – 6  
Inferred   14.0   113   3.43   3.70   1.5   1.7   0.9   14.0   3.43   3.70   1.5   0.9  
  UG2:   Portions  
1 – 3  
Inferred   72.2   116   5.68   6.82   13.2   15.8   7.1   72.2   5.68   6.82   13.2   7.1  
  UG2:   Portions  
4 – 6  
Inferred   21.5   116   5.68   6.82   3.9   4.7   2.1   21.5   5.68   6.82   3.9   2.1  
 Buffelshoek   Merensky:   All  
portions  
Inferred   69.1   117   4.21   4.54   9.3   10.1   5.5   69.1   4.21   4.54   9.3   5.5  
  UG2:   All  
portions  
Inferred   83.9   124   5.46   6.45   14.7   17.4   7.6   83.9   5.46   6.45   14.7   7.6  
  Total       318.7     4.80   5.52   49.1   56.6   27.1   318.7   4.80   5.52   49.1   27.1  

 

 

Notes

  • The figures in the statement above reflect the total estimates for the Tamboti Project, and are fully attributable to Implats until the rights are transferred to Kameni and African Rainbow Minerals
  • The small area of UG2 Reef that occurs at Tweefontein was excluded as it is structurally complex
  • Only Mineral Resources are quoted, as Mineral Reserves cannot be calculated at this stage
  • Mineral Resource estimates allow for estimated geological losses but not for anticipated pillar losses during eventual mining
  • During the past few years both Two Rivers and Kameni have conducted exploration. The results were not incorporated in the estimate above as work was still in progress at 30 June 2012
  • The Merensky Reef represents the mineralised portion of the upper portion of the pyroxenite layer; the resource estimate is based on a minimum mining height of 100cm
  • The UG2 Reef includes the main and leader chromitite layers, which given their close proximity, makes them difficult to separate during mining
  • Mineral Resource grades are reflected in both 4E and 6E formats
  • Rounding of numbers may result in minor computational discrepancies.