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9. Debt (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Total debt	$ 1,717,482	$ 1,786,114
Less current portion	(632,655)	(546,988)
Noncurrent portion	1,084,827	1,239,126
First Security
Total debt	2,725	8,054
Cat Financial Services
Total debt	21,243	27,096
Wells fargo bank
Total debt	37,972	40,278
De Lage Landen Financial Services
Total debt	9,630	13,344
De Lage Landen Financial Services 1
Total debt	12,106	15,776
Phyllis Rice
Total debt	14,146	14,146
Soyatal Mine
Total debt	682,229	715,709
Guadalupe Mine
Total debt	$ 937,431	$ 951,711

X

- Definition

Carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Convertible Notes Payable, excluding current portion. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder.

+ References

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X

- Definition

Carrying value as of the balance sheet date of the portion of long-term debt due within one year or the operating cycle if longer identified as Convertible Notes Payable. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder.

+ References

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
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