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Commitments | 12 Months Ended
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Dec. 31, 2018
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Commitments |
34. |  | COMMITMENTS |  |  |  |  |  |  |  |  |  |  |  |
|  | Capital expenditure |  |  |  |  |  |  |  |  |  |  |  |
|  | Contracted for |  |  | 50.0 |  |  |  | 44.5 |  |  |  |  |
|  | Operating leases2 |  |  |  |  |  |  |  |  |  |  |  |
|  | – within one year |  |  | 76.7 |  |  |  | 66.6 |  |  |  |  |
|  | – later than one and not later than five years |  |  | 256.5 |  |  |  | 257.9 |  |  |  |  |
|  | – later than five years |  |  | 324.2 |  |  |  | 448.0 |  |  |  |  |
Guarantees The Group provides environmental obligation guarantees and other guarantees with respect to its South African, Peruvian, Ghanaian and Australian operations. These guarantees amounted to US$207.6 million at 31 December 2018 (2017: US$112.1 million and 2016: US$100.1 million) (refer note 25.1).
2 | The operating lease commitments consist 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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- Definition The disclosure of commitments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 10 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_10_e&doctype=Standard -URIDate 2018-03-16 + Details
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