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Exchange rates in US$ (Tables)
 12 Months Ended
Dec. 31, 2017
Foreign Exchange Rates [Abstract]  
Summary of principal exchange rate used in preparation of financial statements

Strategic Report

 

Governance Report

 

Financial Statements

 

Production, Reserves
and Operations

 

Additional Information

 

 

The principal exchange rates used in the preparation of the 2017 financial statements were:

 

 

 

 

Full-year average

 

Year-end

 

 

 

 

2017

 

 

2016

 

 

2015

 

 

2017

 

 

2016

 

 

2015

 

Sterling

 

 

1.29

 

 

1.36

 

 

1.53

 

 

1.34

 

 

1.22

 

 

1.48

 

Australian dollar

 

 

0.77

 

 

0.74

 

 

0.75

 

 

0.78

 

 

0.72

 

 

0.73

 

Canadian dollar

 

 

0.77

 

 

0.76

 

 

0.78

 

 

0.79

 

 

0.74

 

 

0.72

 

Euro

 

 

1.13

 

 

1.11

 

 

1.11

 

 

1.20

 

 

1.05

 

 

1.09

 

South African rand

 

 

0.075

 

 

0.068

 

 

0.079

 

 

0.081

 

 

0.073

 

 

0.064

 

 

 

 

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