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Derivative Financial Instruments and Fair Value and Credit Risk of Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2015
Estimated Fair Values of Financial Instruments | The estimated fair values of the Group’s financial instruments are:
|  | December 31, 2015 |  |  | December 31, 2014 |
|  | Carrying value |  |  | Fair value |  |  | Carrying value |  |  | Fair value |
Financial assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  | 440.0 |  |  |  | 440.0 |  |  |  | 458.0 |  |  |  | 458.0 |
Receivables |  |  | 85.2 |  |  |  | 85.2 |  |  |  | 122.4 |  |  |  | 122.4 |
Non-current investments |  |  | 175.0 |  |  |  | 180.0 |  |  |  | 286.5 |  |  |  | 279.9 |
Financial liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term loans |  |  | 1,803.6 |  |  |  | 1,569.8 |  |  |  | 1,770.7 |  |  |  | 1,614.4 |
Accounts payable and provisions |  |  | 381.7 |  |  |  | 381.7 |  |  |  | 460.6 |  |  |  | 460.6 |
Interest payable |  |  | 11.4 |  |  |  | 11.4 |  |  |  | 11.2 |  |  |  | 11.2 |
Short-term loans and current portion of long-term loans |  |  | 16.7 |  |  |  | 16.7 |  |  |  | 140.2 |  |  |  | 140.2 |
Other non-current liabilities |  |  | 6.5 |  |  |  | 6.5 |  |  |  | 9.1 |  |  |  | 9.1 |
Financial Assets and Liabilities Measured at Fair Value by Level | The following table sets forth the Group’s financial assets and liabilities measured at fair value by level within the fair value hierarchy. As required by Accounting Standard Codification, or ASC, fair value guidance, assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. Items listed below are included in the financial assets and liabilities total above:
|  | Fair value at December 31, 2015 |
|  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Listed investments |  |  | 7.8 |  |  |  | 7.8 |  |  |  | — |  |  |  | — |
Trade receivable from provisional copper concentrate sales, net |  |  | 3.1 |  |  |  | — |  |  |  | 3.1 |  |  |  | — |
|  |  | 10.9 |  |  |  | 7.8 |  |  |  | 3.1 |  |  |  | — |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Oil derivative contracts |  |  | 1.5 |  |  |  | — |  |  |  | 1.5 |  |  |  | — |
|  | Fair value at December 31, 2014 |
|  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Listed investments |  |  | 4.4 |  |  |  | 4.4 |  |  |  | — |  |  |  | — |
Trade receivable from provisional copper concentrate sales, net |  |  | 29.5 |  |  |  | — |  |  |  | 29.5 |  |  |  | — |
|  |  | 33.9 |  |  |  | 4.4 |  |  |  | 29.5 |  |  |  | — |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Oil derivative contracts |  |  | 10.3 |  |  |  | — |  |  |  | 10.3 |  |  |  | — |

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13476-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19190-110258 + Details
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