Howard W. Hilshorst

Excalibur Industries is a natural resource company. It engages in the provision of uranium mining services. The company was founded on June 1, 1971 and is headquartered in Hibbing, MN.

Minnesota Steel Industries LLC manufactures and supplies steel. It offers steel products and provides mining and steel erecting contracting services. The company is headquartered in St. Paul, MN.

Society for Mining, Metallurgy, & Exploration, Inc. operates as a professional society corporation representing all professionals serving the minerals industry in more than 85 countries. Its members are engineers, geologists, metallurgists, educators, students and researchers. The company was founded in 1871 and is headquartered in Englewood, CO.

Superior Mineral Resources LLC is a mineral management enterprise that specializes in mineral ownership and management. Superior Mineral Resources is based in the Lake Superior region and is committed to providing a superior level of quality service to its members. The team is made up of a strong mix of seasoned mineral industry veterans and eager new talent. The American company is committed to conducting its business in an ethical, sustainable, and professional manner. The private company was founded in the 19th century and has since grown into a comprehensive mineral management enterprise.