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ASSET RETIREMENT OBLIGATIONS | 12 Months Ended
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Dec. 31, 2017
Disclosure of asset retirement obligations [Abstract] |
ASSET RETIREMENT OBLIGATIONS |
| 12. | ASSET RETIREMENT OBLIGATIONS
Asset retirement obligations primarily relate to the closure of mines of Wuhu Feishang, which includes dismantlement of mining related structures and the reclamation of land upon exhaustion of coal or metal reserves. Asset retirement obligations also include the dismantlement upon the closure of the copper smelting plant of Antay Pacha. The following table describes the changes to the Group's asset retirement obligation liability:
|  | Amount |  |  | Amount |
|  | CNY |  |  | US$ |
At January 1, 2016 |  |  | 4,967 |  |  |  | 763 |
Accretion expenses |  |  | 311 |  |  |  | 48 |
Exchange adjustment |  |  | 24 |  |  |  | 4 |
At December 31, 2016 |  |  | 5,302 |  |  |  | 815 |
Accretion expenses |  |  | 60 |  |  |  | 9 |
Disposal of subsidiaries (Note 3) |  |  | (5,338 | ) |  |  | (820 | )
Exchange adjustment |  |  | (24 | ) |  |  | (4 | )
At December 31, 2017 |  |  | — |  |  |  | — |
The inflation rate, discount rate and market risk premium used for estimating provision for asset retirement obligations of Wuhu Feishang at December 31, 2016 were 2.53%, 9.91% and 6.09%, respectively. The inflation rate, discount rate and market risk premium used for estimating provision for asset retirement obligations of Antay Pacha at December 31, 2016 were 4.80%, 8.42% and 6.09%, respectively.

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