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Inventories
 12 Months Ended
Dec. 31, 2019
Inventories [Abstract]  
Inventories

3.  Inventories



Inventories consist of the following:







 

 

 

 

 

 



 

 

 

 

 

 



 

December 31,

 

December 31,



 

2019

 

2018

Raw materials

 

$

 923,502 

 

$

 1,079,887 

Work-in-process

 

 

 393,433 

 

 

 1,105,272 

Finished goods

 

 

 1,151,713 

 

 

 1,499,900 

Total

 

$

 2,468,648 

 

$

 3,685,059 



The total cost of silver in inventory as raw materials, as work-in-process or as a plated surface on finished goods had an estimated cost of $380,347 and $461,272 at December 31, 2019 and 2018, respectively.