Afplats, Imbasa and Inkosi

 

Afplats, Imbasa and Inkosi
 

Mineral Resources

Afplats’ Leeuwkop Project and adjacent prospecting right areas of Imbasa and Inkosi are located 10km west of Brits on the western limb of the Bushveld Complex. Since the dissolution of Afplats Plc., the Imbasa and Inkosi prospecting rights are held by Impala together with the joint venture partners. The Mineral Resources are therefore reported separately to reflect this ownership. The extent of the different areas are:

  Mining  
right  
(ha) 
Prospecting  
right  
(ha) 
Implats’  
interest  
(%) 
 Afplats   4 602   1 064   74  
 Imbasa     1 673   60  
 Inkosi     2 593   49  

Both the Merensky and UG2 Reefs have been extensively explored but only the UG2 Reef is considered to be economically exploitable at this time. The UG2 Reef comprises a main and upper chromitite layer separated by a narrow pyroxenite parting. This will be exploited as a single package. The Merensky Reef is the upper portion of a pyroxenite layer, with a chromitite stringer close to the hangingwall contact. Mineralisation peaks over the chromitite stringer and decreases into the hangingwall and footwall.

The Merensky Reef occurs about 850m below surface at the southern boundary of the farm Leeuwkop. The vertical separation between the Merensky and UG2 Reefs averages 200m and both reefs dip northwards at 9°.

Mine development was deferred in 2009 until last year, shaft sinking operations were initiated at the Main Shaft only given the prevailing market conditions. The Mineral Resource has therefore not been reclassified to the Reserve category pending the full project approval and funding in accordance with the Implats practice.

 

Afplats, Imbasa and Inkosi Mineral Resources (100%)  
as at 30 June 2012

 Mineral Resources        as at 30 June 2012        as at 30 June 2011  
 Orebody   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  
 Afplats   Measured   79.3   132   5.29   6.57   13.5   16.8   8.2   67.2   5.33   6.61   11.5   7.0  
 UG2   Indicated   14.1   133   5.30   6.57   2.4   3.0   1.5   24.9   5.21   6.45   4.2   2.5  
  Inferred   99.6   132   5.06   6.28   16.2   20.1   9.9   96.9   5.13   6.36   16.0   9.8  
Total Afplats   193.0     5.17   6.42   32.1   39.8   19.6   189.0   5.21   6.46   31.7   19.4  
 Imbasa   Indicated   12.8   131   4.46   5.61   1.8   2.3   1.1   10.9   4.97   6.15   1.7   1.1  
 UG2   Inferred   50.2   137   4.63   5.83   7.5   9.4   4.6   51.8   4.81   6.00   8.0   4.9  
 Inkosi   Indicated   33.1   135   5.14   6.41   5.5   6.8   3.3   22.3   4.47   5.59   3.2   2.0  
 UG2   Inferred   63.2   132   4.89   6.15   9.9   12.5   6.1   76.0   4.72   5.87   11.5   7.1  
Total Imbasa/Inkosi   159.2     4.83   6.06   24.7   31.0   15.2   161.0   4.73   5.89   24.5   15.0  
Total (Afplats, 
Imbasa, Inkosi) 
352.2     5.02   6.26   56.8   70.8   34.8   350.0   4.99   6.20   56.1   34.3  

Notes

  • The statement above reflects total Mineral Resource and Mineral Reserve estimates for Afplats and the adjoining prospecting areas as at 30 June 2012
  • The corresponding estimated Mineral Resources and Mineral Reserves attributable to Implats are summarised elsewhere in the report
  • Implats has chosen not to publish Merensky Reef Mineral Resource estimates as their eventual economic extraction is presently in doubt
  • The updated UG2 grade estimates are based on borehole assay data, which has been expanded through a prospecting programme conducted in the past year
  • The UG2 grade estimate has been updated as additional borehole assay data became available from the ongoing surface drilling campaign
  • The updated estimates are based on in-house Mineral Resource estimation using ordinary kriging
  • Given the additional prospecting, selected Mineral Resource areas with a higher level of confidence have been upgraded in terms of their classification
  • Mineral Resource and Mineral Reserve grades are reflected in both 4E and 6E formats
  • Rounding of numbers may result in minor computational discrepancies.

 

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