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Resources and Reserves

2E PGM Mineral Resources and Mineral Reserves split per operation and project as at 31 December 2017

PGM Mineral Resources
(84.4Moz)
PGM Mineral Reserves
(21.9Moz)
Gold Mineral Resources
(6.3Moz)
Copper Mineral Resources
(18,661.1Mlb)

2E PGM Mineral Resource and Mineral Reserve statement as at 31 December
Mineral Resources  Mineral Reserves  
OPERATIONS2017 2016OPERATIONS20172016
 Tonnes
(Mt)
Grade
(g/t)
2E PGM
(Moz)
2E PGM
(Moz)
 Tonnes
(Mt)
Grade
(g/t)
2E PGM
(Moz)
2E PGM
(Moz)
Stillwater         Stillwater        
Measured 3.7 21.3 2.527   Proved 2.6 20.6 1.727  
Indicated 20.2 18.7 12.132   Probable 15.1 20.1 9.792  
Inferred 48.9 17.5 27.485            
Stillwater – total 72.8 18.0 42.144   Stillwater – total 17.8 20.2 11.519 10.467
East Boulder         East Boulder        
Measured 3.4 15.2 1.687   Proved 2.4 13.2 1.018  
Indicated 29.4 15.6 14.689   Probable 21.6 13.5 9.366  
Inferred 43.6 15.7 21.943            
East Boulder – total 76.4 15.6 38.319   East Boulder – total 24.0 13.4 10.384 10.731
Total 149.2 16.8 80.463   Total 41.8 16.3 21.903 21.198
US region Project Mineral Resource classification
 Dec 2017
 Tonnes
(Mt)
Gold
Grade (g/t)
Gold
(Moz)
Sulfide copper
Grade (%)
Sulfide copper
(Mlbs)
Platinum
Grade (g/t)
Platinum
(Moz)
Palladium
Grade (g/t)
Palladium
(Moz)
Altar 1                  
Measured 1,005.9 0.1 2.981 0.336 7,458.0        
Indicated 1,051.5 0.1 2.253 0.304 7,053.0        
Inferred 556.6 0.1 1.087 0.279 3,420.0        
Altar – total 2,614.0 0.1 6.321 0.311 17,931.0        
Marathon 2                  
Measured 93.4     0.230 473.5 0.2 0.649 0.7 2.044
Indicated 57.9     0.199 254.0 0.2 0.334 0.5 0.956
Inferred 0.4     0.291 2.6 0.0 0.000 0.1 0.001
Marathon – total 151.7     0.218 730.1 0.2 0.983 0.6 3.001
Projects – total open pit 2,765.7 0.1 6.321 0.306 18,661.1 0.0 0.983 0.0 3.001
  • 1 Altar Mineral Resource notes:
  • The Mineral Resource statement is included within a floating cone defined with the following metal prices: $2.75/lb copper, $1,179/oz gold, $22.79/oz silver
  • Copper and arsenic grades are in percentage of dry weight
  • Gold and silver grades are in grams per metric tonne
  • Sulfide copper reflects the estimated grade of copper that could be processed by sulfide flotation
  • There are no Mineral Reserves at Altar at this time
  • Gold contained are in thousands of troy ounces
  • 2 Marathon Mineral Resource notes:
  • Mineral Resources are defined within an optimised pit shell at a net smelter return cut-off of $13.33. Mineral Resources which are not Mineral Reserves do not have demonstrated economic viability. The estimate of Mineral Resources may be materially affected by environmental, permitting, legal, marketing, or other relevant issues. The Mineral Resources were estimated using the Canadian Institute of Mining, Metallurgy & Petroleum (CIM), CIM Standards on Mineral Resources and Mineral Reserves, definitions and guidelines prepared by the CIM Standing Committee on Mineral Reserve Definitions and adopted by CIM Council
  • The quantity and grade of reported Inferred resources in the estimation are uncertain in nature and there has been insufficient exploration to define these inferred resources as an Indicated or Measured Mineral Resource and it is uncertain if further exploration will result in upgrading them to an Indicated or Measured Mineral Resource category
  • Mineral Resources reported within an optimised pit shell using net smelter return (NSR) cut-off of $13.33