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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.

Kronos Worldwide, Inc. produces and markets titanium dioxide pigments (TiO2) in Europe, North America, the Asia Pacific, and internationally. The company produces TiO2 in two crystalline forms, rutile and anatase to impart whiteness, brightness, opacity, and durability for various products, including paints, coatings, plastics, paper, fibers, and ceramics, as well as for various specialty products, such as inks, foods, and cosmetics. It also produces ilmenite, a raw material used directly as a feedstock by sulfate-process TiO2 plants; iron-based chemicals, which are used as treatment and conditioning agents for industrial effluents and municipal wastewater, as well as in the manufacture of iron pigments, cement, and agricultural products; specialty chemicals for use in the formulation of pearlescent pigments, and production of electroceramic capacitors for cell phones and other electronic devices, as well as for use in natural gas pipe, and other specialty applications. In addition, the company provides technical services for its products. It sells its products under the KRONOS brand through agents and distributors to paint, plastics, decorative laminate, and paper manufacturers. The company was founded in 1916 and is headquartered in Dallas, Texas. Kronos Worldwide, Inc. is a subsidiary of Valhi, Inc.

Minerals Technologies Inc. develops, produces, and markets various mineral, mineral-based, and related systems and services. The company operates through two segments, Consumer & Specialties, and Engineered Solutions segments. The Consumer & Specialties segment offers household and personal care products, such as pet litter, personal care, fabric care, edible oil and other fluid purification, animal health, and agricultural products; and specialty additives products, including precipitated calcium carbonate and ground calcium carbonate products that are used in the paper, paperboard, and fiber based packaging industries, as well as automotive, construction, and table and food applications. This segment produces limestone and dolomitic limestone used in construction, automotive, and consumer markets for packaging applications. The Engineered Solutions segment provides high-temperature technology products consisting of custom-blended mineral and non-mineral products for casting auto parts, farm and construction equipment, oil and gas production equipment, power generation turbine castings, and rail car components; and environmental and infrastructure products comprising geosynthetic clay lining systems, vapor intrusion mitigation products, sub surface waterproofing systems, green roofs, wastewater remediation, drinking water purification technologies, and drilling products. In addition, this segment provides chromite products; gunnable monolithic refractory products and application systems; monolithic refractory materials and pre-cast refractory shapes; refractory shapes and linings; carbon composite and pyrolitic graphite; and filtration and well testing services. It markets its products primarily through its direct sales force, as well as regional distributors. The company serves in the United States, Canada, Latin America, Europe, Africa, and Asia. Minerals Technologies Inc. was incorporated in 1968 and is headquartered in New York, New York.

Tronox Holdings plc operates as a vertically integrated manufacturer of TiO2 pigment in North America, South and Central America, Europe, the Middle East, Africa, and the Asia Pacific. The company operates titanium-bearing mineral sand mines; and engages in beneficiation and smelting operations. It offers TiO2 pigment; ultrafine specialty TiO2; zircon; feedstock; pig iron; monazite; titanium tetrachloride; and other products. The company's products are used for the manufacture of paints, coatings, plastics, and paper, as well as various other applications. Tronox Holdings plc is based in Stamford, Connecticut.