6. Commitments and Contingencies	3 Months Ended
Mar. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	The Company pays various royalties on the sale of zeolite products. On a combined basis, royalties vary from 8%-13%. During the three month periods ended March 31, 2021 and 2020, the Company had royalty expense of $62,130 and $64,150, respectively. At March 31, 2021 and December 31, 2020, the Company had accrued royalties payable of $353,591 and $434,981, respectively, which is included in accrued liablities. The Company is currently in negotiations with certain royalty holders to modify the terms of the agreements. In June of 2013, the Company entered into a lease, as lessor, to mine antimony ore from concessions located in the Wadley Mining district in Mexico. The lease called for a term of one year and required payments of $10,000, plus a tax of $1,700, per month. The lease was renewable each year with a 15 day notice to the lessor and agreement of terms. The lease renewal was scheduled for renewal in June 2020. In July 2020, the Company decided not to renew the lease due to the continuing low market price for antimony and to reduce Mexican antimony production while seeking other lower cost sources of antimony ore and concentrates. The Company wrote off $318,502 of assets at the Wadley mine during the year ended December 31, 2020.

6. Commitments and Contingencies

3 Months Ended

Mar. 31, 2021

Commitments and Contingencies Disclosure [Abstract]

The Company pays various royalties on the sale of zeolite products. On a combined basis, royalties vary from 8%-13%. During the three month periods ended March 31, 2021 and 2020, the Company had royalty expense of $62,130 and $64,150, respectively. At March 31, 2021 and December 31, 2020, the Company had accrued royalties payable of $353,591 and $434,981, respectively, which is included in accrued liablities. The Company is currently in negotiations with certain royalty holders to modify the terms of the agreements.

In June of 2013, the Company entered into a lease, as lessor, to mine antimony ore from concessions located in the Wadley Mining district in Mexico. The lease called for a term of one year and required payments of $10,000, plus a tax of $1,700, per month. The lease was renewable each year with a 15 day notice to the lessor and agreement of terms. The lease renewal was scheduled for renewal in June 2020. In July 2020, the Company decided not to renew the lease due to the continuing low market price for antimony and to reduce Mexican antimony production while seeking other lower cost sources of antimony ore and concentrates. The Company wrote off $318,502 of assets at the Wadley mine during the year ended December 31, 2020.