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DISPOSAL OF SUBSIDIARIES - Other disposals (Details) - CNY (¥)
¥ in Thousands
1 Months Ended 12 Months Ended
Feb. 20, 2019
Jul. 31, 2020
Jul. 31, 2019
Jan. 31, 2019
Aug. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Shandong Shanlv Electronic Ltd                
DISPOSAL OF SUBSIDIARIES                
Ownership interest in subsidiary (in percent)   75.00%            
Gain (loss) on disposal   ¥ 10,720            
China Aluminum Nanhai Alloy                
DISPOSAL OF SUBSIDIARIES                
Ownership interest in subsidiary (in percent)       100.00%        
The fair value of the remaining equity interest in subsidiary       ¥ 350,000        
Fair value gain (loss) recognized for remaining equity interest       ¥ 258,000        
Chinalco Innovative                
DISPOSAL OF SUBSIDIARIES                
Ownership interest in associate (in percent)       19.4852%        
Inner Mongolia Fengrong Co Ltd and Ningxia Fenghao, Disposal Group Held For Sale [Member]                
DISPOSAL OF SUBSIDIARIES                
Gain (loss) on disposal ¥ 3,014              
Inner Mongolia Fengrong                
DISPOSAL OF SUBSIDIARIES                
Ownership interest in subsidiary (in percent) 40.00%              
Ningxia Fenghao                
DISPOSAL OF SUBSIDIARIES                
Ownership interest in subsidiary (in percent) 60.00%              
Shanghai Kailin                
DISPOSAL OF SUBSIDIARIES                
Ownership interest in subsidiary (in percent)     100.00%          
Gain (loss) on disposal     ¥ 160          
Ruzhou Jinhua                
DISPOSAL OF SUBSIDIARIES                
Ownership interest in subsidiary (in percent)     51.00%          
Gain (loss) on disposal               ¥ 113
Zhengzhou Chalco Longyu Mining                
DISPOSAL OF SUBSIDIARIES                
Ownership interest in subsidiary (in percent)         51.00%      
Gain (loss) on disposal         ¥ 8,000      
Shanxi Huatai Carbon                
DISPOSAL OF SUBSIDIARIES                
Gain (loss) on disposal             ¥ (2,000)  
Hedong Carbon                
DISPOSAL OF SUBSIDIARIES                
Gain (loss) on disposal           ¥ (2,000)