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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.

MDU Resources Group, Inc. engages in the regulated energy delivery, and construction materials and services businesses in the United States. It operates through four segments: Electric, Natural Gas Distribution, Pipeline, and Construction Services. The Electric segment generates, transmits, and distributes electricity for residential, commercial, industrial, and municipal customers in Montana, North Dakota, South Dakota, and Wyoming; and operates 3,400 miles of transmission lines, 4,800 miles of distribution lines, and 82 transmission and 298 distribution substations. The Natural Gas Distribution segment distributes natural gas for residential, commercial, and industrial customers in Idaho, Minnesota, Montana, North Dakota, Oregon, South Dakota, Washington, and Wyoming; and supplies related value-added services. The Pipeline segment provides natural gas transportation and underground storage services through a regulated pipeline system primarily in the Rocky Mountain and northern Great Plains regions; and cathodic protection and other energy-related services. The Construction Services segment offers electrical and mechanical contracting services, including the construction and maintenance of electrical and communication wiring and infrastructure, fire suppression systems, mechanical piping, and services; transmission and distribution contracting services, comprise construction and maintenance of overhead and underground electrical, and gas and communication infrastructure; and manufactures and supplies transmission and distribution lines construction equipment and tools. It serves manufacturing, commercial, industrial, transportation, institutional, and renewable and government customers, as well as utilities. MDU Resources Group, Inc. was incorporated in 1924 and is headquartered in Bismarck, North Dakota.

Sociedad Química y Minera de Chile S.A. produces and distributes specialty plant nutrients, iodine derivatives, lithium derivatives, potassium chloride and sulfate, industrial chemicals, and other products and services. The company offers specialty plant nutrients, including potassium nitrate, sodium nitrate, sodium potassium nitrate, specialty blends, and other specialty fertilizers. It also provides iodine and its derivatives for use in medical, pharmaceutical, agricultural, and industrial applications comprising x-ray contrast media, polarizing films for LCD and LED, antiseptics, biocides and disinfectants, pharmaceutical synthesis, electronics, pigments, and dye components. In addition, the company offers lithium carbonates for various applications that include electrochemical materials for batteries, frits for the ceramic and enamel industries, heat-resistant glass, air conditioning chemicals, continuous casting powder for steel extrusion, primary aluminum smelting process, pharmaceuticals, and lithium derivatives, as well as ingredient in manufacturing of gunpowder. Further, it supplies lithium hydroxide for the lubricating greases industry, as well as cathodes for batteries. Additionally, it offers potassium chloride and potassium sulfate for various crops, including corn, rice, sugar, soybean, and wheat; industrial chemicals, including sodium nitrate, potassium nitrate, potassium chloride, and solar salts; and other fertilizers and blends. The company operates in Chile, Latin America and the Caribbean, Europe, North America, Asia, and internationally. The company was founded in 1960 and is headquartered in Santiago, Chile.

Summit Materials, Inc. operates as a vertically integrated construction materials company in the United States and Canada. It operates in three segments: West, East, and Cement. The company offers aggregates, cement, ready-mix concrete, asphalt paving mixes, and concrete products, as well as plastics components. It also provides asphalt paving and related services. In addition, the company operates municipal waste, construction, and demolition debris landfills; and liquid asphalt terminals. The company serves the public infrastructure, and residential and nonresidential end markets. Summit Materials, Inc. was founded in 2009 and is headquartered in Denver, Colorado.

Teck Resources Limited engages in exploring for, acquiring, developing, and producing natural resources in Asia, Europe, and North America. The company operates through Steelmaking Coal, Copper, Zinc, and Energy segments. Its principal products include copper, zinc, steelmaking coal, and blended bitumen. The company also produces lead, silver, and molybdenum; and various specialty and other metals, chemicals, and fertilizers. In addition, it explores for gold. The company was formerly known as Teck Cominco Limited and changed its name to Teck Resources Limited in April 2009. The company was founded in 1913 and is headquartered in Vancouver, Canada.