Fair Value of Assets and Liabilities (Tables)

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Summary of Estimated Fair Values of the Group's Financial Assets and Liabilities

The estimated fair values of the Group’s financial assets and liabilities are:

2017

2016

Carrying
amount
US$ million

Fair
value
US$ million

Carrying
amount
US$ million

Fair
value
US$ million

Financial assets

Cash and cash equivalents

479.0

526.7

Trade and other receivables

66.5

68.5

Gold and oil derivative contracts

25.0

—

Environmental trust fund

55.5

44.5

Investments

104.6

19.7

Financial liabilities

Trade and other payables

451.0

459.3

Borrowings

1,587.9

1,611.5

1,504.9

1,496.7

Current portion of borrowings

193.6

188.0

Copper derivative contracts

3.3

—

South Deep dividend

6.4

6.4

Schedule of Group's Assets and Liabilities Measured at Fair Value by Level Within the Fair Value Hierarchy

The following table sets out the Group’s assets and liabilities measured at fair value by level within the fair value hierarchy at the reporting date:


UNITED STATES DOLLAR					UNITED STATES DOLLAR
2016					2017
Level 1	Level 2	Level 3	Total		Total	Level 1	Level 2	Level 3
				Assets measured at fair value
—	10.6	—	10.6	Trade receivables from provisional copper and gold concentrate sales	21.2	—	21.2	—
10.5	—	—	10.5	Listed investments	99.0	99.0	—	—
—	5.9	—	5.9	Derivative instruments	5.5	—	5.5	—
—	—	—	—	Oil derivative contracts	14.1	—	14.1	—
—	—	—	—	Gold derivative contracts	10.9	—	10.9	—

				Liabilities measured at fair value
—	—	—	—	Copper derivative contracts	3.3	—	3.3	—