4. Manufacturing
4.1 From natural gypsum
There are three stages in making plaster from natural gypsum:
extraction and preparation of gypsum ;
cooking ;
obtaining finished products.
4.1.1 Extraction and preparation of gypsum
Extraction is carried out in underground or open-cast quarries.
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Underground mining
Where the...
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Manufacturing
Varieties
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Gypsum around the world
The United States Bureau of Mines (USBM) estimates global gypsum reserves at 2,300 million tonnes. However, not all existing deposits have been identified, and potential resources are certainly higher.
The United States and Canada have the largest identified reserves, estimated at 730 and 450 million tonnes respectively. Europe has around 800 million tonnes of reserves...
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