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Northern Technologies International Corporation develops and markets rust and corrosion inhibiting solutions in North America, South America, Europe, Asia, the Middle East and internationally. It offers rust and corrosion inhibiting products, such as plastic and paper packaging, liquids, coatings, rust removers, cleaners, diffusers, and engineered solutions designed for the oil and gas industry under the ZERUST brand. The company provides a portfolio of bio-based and certified compostable polymer resin compounds and finished products under the Natur-Tec brand. In addition, it offers on-site and technical consulting for rust and corrosion prevention issues. It sells its products and services to automotive, electronics, electrical, mechanical, military, retail consumer, and oil and gas markets through direct sales force, network of independent distributors, agents, manufacturer's sales representatives, and strategic partners. The company was founded in 1970 and is headquartered in Circle Pines, Minnesota.

PolyMet Mining Corp., through its subsidiary, Poly Met Mining, Inc., engages in the exploration and development of natural resource properties. Its primary mineral property is the NorthMet project, a polymetallic project that hosts copper, nickel, cobalt, platinum, palladium, gold, and silver mineralization covering an area of approximately 5,980 acres located in northeastern Minnesota, the United States. The company was formerly known as Fleck Resources Ltd. and changed its name to PolyMet Mining Corp. in June 1998. PolyMet Mining Corp. was incorporated in 1981 and is headquartered in Saint Paul, Minnesota. PolyMet Mining Corp. operates as a subsidiary of Glencore AG.

Reunion Gold Corporation engages in the acquisition, exploration, and development of mineral projects in South America. The companys flagship project is the Oko West project located in Guyana. It also holds interest in other projects located in French Guiana and Suriname. The company was formerly known as New Sleeper Gold Corporation and changed its name to Reunion Gold Corporation in June 2006. Reunion Gold Corporation was founded in 2003 and is headquartered in Longueuil, Canada.

Vista Gold Corp., together with its subsidiaries, engages in the evaluation, acquisition, exploration, and advancement of gold exploration and development projects primarily in Australia. The company's flagship asset is the 100% owned Mt Todd gold project located in Northern Territory, Australia. Vista Gold Corp. was incorporated in 1983 and is headquartered in Littleton, Colorado.