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2. Metal roof - Wikipedia

   en.wikipedia.org/wiki/Metal_roof

   Metal roof. A metal roof is a roofing system featuring metal pieces or tiles exhibiting corrosion resistance, impermeability to water, and long life. It is a component of the building envelope. The metal pieces may be a covering on a structural, non-waterproof roof, or they could be self-supporting sheets.

3. Zinc mining in the United States - Wikipedia

   en.wikipedia.org/wiki/Zinc_mining_in_the_United...

   Zinc mining in the United States. Zinc mining in the United States produced 780,000 tonnes (860,000 short tons) of zinc in 2019, making it the world's fourth-largest zinc producer, after China, Australia, and Peru. Most US zinc came from the Red Dog mine in Alaska. The industry employed about 2,500 in mining and milling, and 250 in smelting.

4. Matthiessen and Hegeler Zinc Company - Wikipedia

   en.wikipedia.org/wiki/Matthiessen_and_Hegeler...

   The Mattheissen and Hegeler (M&H) Zinc Company was a zinc manufacturing company headquartered in LaSalle, Illinois. At one time, the family-owned company was the largest zinc manufacturing plant in the United States. The company brought zinc ore from Wisconsin and Missouri to the coal fields of Northern Illinois. [1]

5. Red Dog mine - Wikipedia

   en.wikipedia.org/wiki/Red_Dog_mine

   The mine is the world's largest producer of zinc and has the world's largest zinc reserves. [ 1 ] [ 2 ] Red Dog accounts for 10% of the world's zinc production. [ 3 ] Red Dog accounted for 66% of the mineral value produced in Alaska in 2018. [ 1 ]

6. Roof - Wikipedia

   en.wikipedia.org/wiki/Roof

   A roof (pl.: roofs or rooves) is the top covering of a building, including all materials and constructions necessary to support it on the walls of the building or on uprights, providing protection against rain, snow, sunlight, extremes of temperature, and wind. [ 1 ] A roof is part of the building envelope.

7. Teck Cominco smelter - Wikipedia

   en.wikipedia.org/wiki/Teck_Cominco_smelter

   Coordinates: 49°06′00″N 117°42′45″W. Teck Cominco smelter. The Teck Cominco smelter, also known as the Teck Cominco Lead-Zinc Smelter, Cominco Smelter, and Trail smelter located in Trail, British Columbia, Canada, is the largest integrated lead-zinc smelter of its kind in the world. [1][2] It is situated approximately 10 miles (16 km ...