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INCOME TAX EXPENSE (Narrative) (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 | Dec. 29, 2017 | Dec. 31, 2019 CNY (¥)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Applicable tax rate | 25.00% | 25.00% | 25.00% |  |
USD [Member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Applicable tax rate | 25.00% |  |  |  |
Unused tax losses [Member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Unused tax losses for which no deferred tax assets were recognized | ¥ |  | ¥ 6,740 |  |  | ¥ 7,410
Unused tax losses [Member] | Expiring 2020 [Member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Unused tax losses | ¥ |  |  |  |  | 1,100
Expiry date description | Unused tax losses if unused, will expire by the end of 2020 |  |  |  |
Unused tax losses [Member] | Expiring 2021 [Member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Unused tax losses | ¥ |  |  |  |  | 1,170
Expiry date description | Unused tax losses if unused, will expire by the end of 2021 |  |  |  |
Unused tax losses [Member] | Expiring 2022 [Member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Unused tax losses | ¥ |  |  |  |  | 1,070
Expiry date description | Unused tax losses if unused, will expire by the end of 2022 |  |  |  |
Unused tax losses [Member] | Expiring 2023 [Member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Unused tax losses | ¥ |  |  |  |  | 2,320
Expiry date description | Unused tax losses if unused, will expire by the end of 2023 |  |  |  |
Unused tax losses [Member] | Expiring 2024 [Member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Unused tax losses | ¥ |  |  |  |  | ¥ 1,750
Expiry date description | Unused tax losses if unused, will expire by the end of 2024 |  |  |  |
Unused tax losses [Member] | USD [Member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Unused tax losses for which no deferred tax assets were recognized | $ | $ 1,060 |  |  |  |
Unused tax losses [Member] | USD [Member] | Expiring 2020 [Member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Unused tax losses | $ | $ 160 |  |  |  |
Expiry date description | Unused tax losses if unused, will expire by the end of 2020 |  |  |  |
Unused tax losses [Member] | USD [Member] | Expiring 2021 [Member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Unused tax losses | $ | $ 170 |  |  |  |
Expiry date description | Unused tax losses if unused, will expire by the end of 2021 |  |  |  |
Unused tax losses [Member] | USD [Member] | Expiring 2022 [Member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Unused tax losses | $ | $ 150 |  |  |  |
Expiry date description | Unused tax losses if unused, will expire by the end of 2022 |  |  |  |
Unused tax losses [Member] | USD [Member] | Expiring 2023 [Member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Unused tax losses | $ | $ 330 |  |  |  |
Expiry date description | Unused tax losses if unused, will expire by the end of 2023 |  |  |  |
Unused tax losses [Member] | USD [Member] | Expiring 2024 [Member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Unused tax losses | $ | $ 250 |  |  |  |
Expiry date description | Unused tax losses if unused, will expire by the end of 2024 |  |  |  |
HONG KONG |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Applicable tax rate | 16.50% |  |  |  |
Bolivia |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Applicable tax rate |  |  |  | 25.00% |
PRC |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Applicable tax rate | 25.00% |  |  |  |

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