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Concentrations
12 Months Ended
Dec. 31, 2019
Risks and Uncertainties [Abstract]  
Concentrations Concentrations
As of December 31, 2019, two customers accounted for 81% of the Company’s total accounts receivable. As of December 31, 2018, four customers accounted for 89% of the Company’s total accounts receivable.
During the years ended December 31, 2019, 2018 and 2017, 73%, 66% and 72% of our revenues were earned from four customers, respectively.
As of December 31, 2019, one vendor accounted for 26% of the Company’s accounts payable. As of December 31, 2018, one vendor accounted for 16% of the Company’s accounts payable.
During the years ended December 31, 2019, 2018 and 2017, two suppliers accounted for 44%, 40% and 59% of the Company’s cost of goods sold, respectively.
The Company’s sand inventory and mining operations are located in Wisconsin. There is a risk of loss if there are significant environmental, legal or economic changes to this geographic area.
The Company primarily utilizes one third-party rail company to ship its products to customers from its plant. There is a risk of business loss if there are significant impacts to this third party’s operations.