Exhibit 21.01

Subsidiaries of Registrant, as of December 31, 2017

Bear River Zeolite Company

C/o Box 643

Thompson Falls, MT 59873

Antimonio de Mexico S.A. de C.V.

C/o Box 643

Thompson Falls, MT 59873

United States Antimony, Mexico S.A. de C.V.

C/o Box 643

Thompson Falls, MT 59873