Other Mineral Resources
Offshore areas of the US may contain resources of sulfur, salt, sand and gravel, phosphate rock, manganese nodules, and heavy-mineral placer deposits. To date, none of these has been produced for commercial purposes except sulfur and salt, although the MMS has allowed sand dredging in federal waters to restore damaged beaches in Maryland, Virginia, South Carolina, and Florida.
From 1960 to 2000, sulfur was mined by the Frasch process from the caprock of a salt dome at the Main Pass 299 mine, offshore Louisiana. A total of 34 million short tons of sulfur were recovered before the mine was closed; salt was also recovered.
Read more about this topic: Offshore Oil And Gas In The United States
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