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Compass Minerals International, Inc., provides essential minerals in the United States, Canada, the United Kingdom, and internationally. It operates through two segments, Salt and Plant Nutrition. The Salt segment produces, markets, and sells sodium chloride and magnesium chloride, including rock salt, mechanically and solar evaporated salt, and brine and flake magnesium chloride products; and purchases potassium chloride and calcium chloride to sell as finished products or to blend with sodium chloride to produce specialty products. This segment provides products for use as a deicer for roadways, consumer, and professional use; as an ingredient in chemical production; for water treatment, human, and animal nutrition; and for various other consumer and industrial uses, as well as records management services. The Plant Nutrition segment produces sulfate of potash specialty fertilizers in various grades that are used in broadcast spreaders, direct application, and liquid fertilizer solutions under the Protassium+ brand name; turf products used by the turf and ornamental markets, as well as for blends used on golf course greens; organic products; and develops and produces a portfolio of magnesium chloride-based aerial and ground fire retardant products. This segment provides its products to distributors and retailers of crop inputs, as well as growers. The company was formerly known as Salt Holdings Corporation and changed its name to Compass Minerals International, Inc. in December 2003. Compass Minerals International, Inc. was founded in 1844 and is headquartered in Overland Park, Kansas.

Hecla Mining Company, together with its subsidiaries, provides precious and base metal properties in the United States, Canada, Japan, Korea, and China. The company mines for silver, gold, lead, and zinc concentrates, as well as carbon material containing silver and gold for custom smelters, metal traders, and third-party processors; and doré containing silver and gold. It flagship project is the Greens Creek mine located on Admiralty Island in southeast Alaska. Hecla Mining Company was incorporated in 1891 and is headquartered in Coeur d'Alene, Idaho.

Piedmont Lithium Inc., a development stage company, engages in the exploration and development of resource projects in the United States. The company primarily holds a 100% interest in the Carolina Lithium Project that include an area of approximately 3,706 acres located within the Carolina Tin-Spodumene Belt situated to the northwest of Charlotte, North Carolina in the United States. It also owns a real property of approximately 5 acres in Bessemer City, North Carolina; and 61-acre property in Kings Mountain, North Carolina. The company was founded in 2016 and is headquartered in Belmont, North Carolina.

U.S. Silica Holdings, Inc. produces and sells commercial silica in the United States. It operates through two segments: Oil & Gas Proppants and Industrial & Specialty Products. The company offers whole grain commercial silica products to be used as frac for oil and natural gas recovery, as well as sells its whole grain silica products for the manufacturing of glass products. It also provides various grades of whole-grain round silica to the foundry industry; ground silica and industrial minerals products used for various products; and engineered performance materials made from diatomaceous earth (DE), clay, and perlite. In addition, the company offers transportation, equipment rental, and contract labor services. It serves oilfield services companies, and exploration and production companies that are engaged in hydraulic fracturing, building and construction products, chemicals, fillers and extenders, filtration, glass, sports, recreation, and industrial and specialty products end markets. The company was formerly known as GGC USS Holdings Inc. and changed its name to U.S. Silica Holdings, Inc. in July 2011. U.S. Silica Holdings, Inc. was founded in 1894 and is headquartered in Katy, Texas.