Subsidiaries of Registrant as of December 31, 2024

Name:

Jurisdiction

Bear River Zeolite Company

Idaho

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

Mexico

US Antimony de Mexico, S.A. de C.V.

Mexico

Stibnite Holding Company US Inc.

Montana

Antimony Mining and Milling US LLC

Montana

AGAU Mines, Inc.

Montana

Lanxess Laurel de Mexico, S.A. de C.V.

Mexico

Great Land Minerals, LLC

Alaska

Denali Minerals, LLC

Alaska

Alaska Antimony LLC

Alaska

UAMY Cobalt Corporation

Ontario, Canada