The largest salt mine in the world is located at Goderich Ontario Canada which is situated on the eastern shore of Lake Huron.
There is a salt mine in Poland that has a church, a hospital, hotel in it. It is one of the world's largest.
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Some of the biggest gold mines in the world are Grasberg Gold Mine (Indonesia), Muruntau Gold Mine (Uzbekistan), Carlin-Nevada Complex (USA) and Yanacocha Gold Mine (Peru).
The biggest pulley in the world is located at the Cerro Verde mine in Peru, with a diameter of 11 meters (36 feet). It is used to transport materials in the mining operation.
The biggest salt lake in China is Qinghai Lake, located in Qinghai Province. It covers an area of about 4,550 square kilometers and is also the largest lake in China by surface area.
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The largest copper mine in the world is the Escondida mine located in Chile. It is owned by BHP and Rio Tinto. The mine produces more than a million tons of copper annually.