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REVENUE | 12 Months Ended
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Dec. 31, 2020
Revenue [abstract] |
REVENUE FROM CONTINUING OPERATIONS | 10. REVENUE Revenue represents the following:
|  | Year Ended December 31, |
|  | 2018 |  |  | 2019 |  |  | 2020 |  |  | 2020 |
|  | CNY |  |  | CNY |  |  | CNY |  |  | US$ |
Revenue from contracts with a customer |  |  | — |  |  |  | 12,969 |  |  |  | 6,867 |  |  |  | 1,052 |
Revenue from contracts with a customer (a) Disaggregated revenue information
|  | Year Ended December 31, |
|  | 2018 |  |  | 2019 |  |  | 2020 |  |  | 2020 |
|  | CNY |  |  | CNY |  |  | CNY |  |  | US$ |
Type of goods |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of copper ores |  |  | — |  |  |  | 12,969 |  |  |  | 6,867 |  |  |  | 1,052 |
Geographic market |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mainland China |  |  | — |  |  |  | 12,969 |  |  |  | 6,867 |  |  |  | 1,052 |
Timing of revenue recognition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goods transferred at a point in time |  |  | — |  |  |  | 12,969 |  |  |  | 6,867 |  |  |  | 1,052 |
All revenue was generated from the exploration and mining segment (Note 22). No revenue was recognized in the current reporting period that was included in contract liabilities at the beginning of the reporting period and recognized from performance obligations satisfied in previous periods. (b) Performance obligation Information about the Group’s performance obligation is summarized below: Trading of copper ores The performance obligation is satisfied upon delivery of the copper ores and payment is generally due within 3 months from delivery.

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