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Commitments | 12 Months Ended
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Dec. 31, 2017
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Commitments |
33. | COMMITMENTS
|  | UNITED STATES DOLLAR |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Capital expenditure |  |  |  |  |  |  |  |  |  |  |  |
Contracted for |  |  | 44.5 |  |  |  | 46.2 |  |  |  |  |
Operating leases2 |  |  |  |  |  |  |  |  |  |  |  |
- within one year |  |  | 66.6 |  |  |  | 42.5 |  |  |  |  |
- later than one and not later than five years |  |  | 257.9 |  |  |  | 229.9 |  |  |  |  |
- later than five years |  |  | 448.0 |  |  |  | 277.3 |  |  |  |  |
Guarantees |  |  |  |  |  |  |  |  |  |  |  |
The Group provides environmental obligation guarantees with respect to its South African, Peruvian and Ghanaian operations. These guarantees amounted to US$112.1 million at 31 December 2017 (2016: US$100.1 million) (refer note 25.1).
| 2 | The operating lease commitments consists mainly of power purchase agreements entered into at Tarkwa, Damang, Granny Smith and Gruyere. Included in these amounts are payments for non-lease elements of the arrangement.

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