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4. Revenue Recognition (Tables)
3 Months Ended
Mar. 31, 2020
Revenue from Contract with Customer [Abstract]  
Disaggregation of revenue

Sales of products for the three month periods ended March 31, 2020 and 2019, were as follows:

 

    Three Months Ended  
    March 31,  
    2020     2019  
Antimony   $ 1,121,425     $ 1,705,823  
Zeolite     559,360       726,015  
Precious metals     62,206       24,527  
    $ 1,742,991     $ 2,456,365  

 

The following is sales information by geographic area based on the location of customers for the three-month periods ended March 31, 2020 and 2019

 

    Three Months Ended  
    March 31,  
    2020     2019  
United States   $ 1,566,237     $ 2,244,400  
Canada     176,754       211,965  
    $ 1,742,991     $ 2,456,365  

Sales of products to significant customers
Sales to Three    For the Period Ended  
Largest Customers  

March 31,

2020

   

March 31,

2019

 
Kohler Corporation   $ -     $ 458,094  
GE Chaplin, Inc.     114,291       -  
Nyacol Technologies     106,161       -  
East Penn Manufacturing     -       157,328  
Mexichem Speciality Compounds     413,993       684,011  
    $ 634,445     $ 1,299,433  
% of Total Revenues     36.40 %     52.90 %

 

Accounts receivable from largest customers were as follows at March 31, 2020 and December 31, 2019:

 

Largest            
Accounts Receivable  

March 31,

2020

   

December 31,

2019

 
Nutreco Canada Inc.   $ 20,452     $ 21,219  
Ralco Mix Products     16,600       -  
Lake Shore Gold     -       27,854  
Teck North America Inc.     78,869       -  
Commerce Industrial Chemical     -       54,684  
    $ 115,921     $ 103,757  
% of Total Receivables     50.47 %     36.48 %