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          Smart coal mine: Higher efficiency, lower costs
          
        
          
      
          
      
          
        
          
          chinadaily.com.cn |
          Updated: 2021-10-14 11:26
          
          
          
          
        


        
      
          
      
          
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   Two workers show the screen of a phone when they make video contact with people on the ground at an underground water pump room at the Caojiatan smart coal mine on Oct 12. [Photo/Xinhua] 
 
           

           

          
        
          

        
        
      
          
        
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