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4. PROPERTY, PLANT AND EQUIPMENT, NET
3 Months Ended
Mar. 31, 2019
Property, Plant and Equipment [Abstract]  
4. PROPERTY, PLANT AND EQUIPMENT, NET

Property, plant and equipment, net consist of the following:

 

    March 31,
2019
  December 31,
2018
At cost:                
Mineral rights   $ 2,864,171     $ 2,809,977  
Buildings     62,040,345       60,866,462  
Plant and machinery     164,283,763       161,178,816  
Motor vehicles     6,350       6,230  
Furniture, fixtures and office equipment     3,352,442       3,289,010  
Construction in process     16,077,711       6,535,808  
Total     248,624,782       234,686,303  
Less: Accumulated depreciation and amortization     (140,597,289 )     (134,681,628 )
     Impairment     (18,063,835 )     (17,722,045 )
Net book value   $ 89,963,658     $ 82,282,630  

 

The Company has certain buildings and salt pans erected on parcels of land located in Shouguang, PRC, and such parcels of land are collectively owned by local townships or the government authority. The Company has not been able to obtain property ownership certificates over these buildings and salt pans. The aggregate carrying values of these properties situated on parcels of the land are $19,631,699 and $20,409,998 as at March 31, 2019 and December 31, 2018, respectively.

 

During the three-month period ended March 31, 2019, depreciation and amortization expense totaled $3,311,907, of which $3,066,896, $224,830 and $20,181were recorded in direct labor and factory overheads incurred during plant shutdown and administrative expenses and cost of net revenue, respectively.

 

During the three-month period ended March 31, 2018, depreciation and amortization expense totaled $4,688,248, of which $4,504,249 and $183,999 were recorded in direct labor and factory overheads incurred during plant shutdown and administrative expenses, respectively.