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PROPERTY, PLANT AND EQUIPMENT (Net Carrying Amount) (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Disclosure of detailed information about property, plant and equipment [line items]      
At December 31 | ¥   ¥ 275 ¥ 337
USD [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
At December 31 | $ $ 40    
Net carrying amount [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
At December 31 | ¥   275 337
Net carrying amount [Member] | USD [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
At December 31 | $ 40    
Net carrying amount [Member] | Buildings [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
At December 31 | ¥   40 43
Net carrying amount [Member] | Buildings [Member] | USD [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
At December 31 | $ 6    
Net carrying amount [Member] | Mining structures and mining rights [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
At December 31 | ¥  
Net carrying amount [Member] | Mining structures and mining rights [Member] | USD [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
At December 31 | $    
Net carrying amount [Member] | Machinery and equipment [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
At December 31 | ¥   19 19
Net carrying amount [Member] | Machinery and equipment [Member] | USD [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
At December 31 | $ 3    
Net carrying amount [Member] | Motor vehicles [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
At December 31 | ¥   216 275
Net carrying amount [Member] | Motor vehicles [Member] | USD [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
At December 31 | $ 31    
Net carrying amount [Member] | Construction in progress [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
At December 31 | ¥  
Net carrying amount [Member] | Construction in progress [Member] | USD [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
At December 31 | $