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Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO 4 ·2H 2 O. [4] It is widely mined and is used as a fertilizer and as the main constituent in many forms of plaster, drywall and blackboard or sidewalk chalk.
The community is named for deposits of the gypsum rock near the original town site. [3] Gypsum mining in the area by U.S. Gypsum Corporation began in 1902 and stopped in the 1970s, however the company continues to operate a manufacturing plant in the community. [4] Children from Gypsum families generally attend the Port Clinton City School ...
Open-pit and underground mining took place at the site. [3] In 1941, Blue Diamond added a processing plant on-site for the gypsum, which had previously been processed in Los Angeles. [3] [7] [8] Gypsum was mined at the top of Blue Diamond Hill and was transported by tram to the area below, where it was processed.
Gypsum mines, the origin of the famous plaster of Paris, used this technique with an added third dimension: as some of northern Paris's gypsum deposits measured 14 metres (46 ft) thick in some places, miners would create their tunnel grids in the top of the deposit, then begin extracting downwards.
Room and pillar mining of gypsum was used in Iowa beginning in 1892, and was phased out of use in 1927 due to low recovery and development of technologies that made surface mining more practical, safe, and cost effective. [4] More recently, the United States Gypsum Sperry mine, near Mediapolis, Iowa, opened in 1961. This room-and-pillar mine ...
The old mine in 2006, looking east from the haul road. The largest industry in the town is American Gypsum's (formerly Centex and before that, Eagle Gypsum Limited) drywall plant. The facility produces a variety of wallboard products, which is shipped by both rail and truck. The company also operates an open pit gypsum mine in the hills north ...
USG has a large gypsum plant located 17 miles (27 km) west of El Centro, California, along highway Interstate 8, at Plaster City. [25] The Plaster City location makes Sheetrock brand gypsum panels. The gypsum is mined from a quarry located 20 miles (32 km) to the north, in the Fish Creek Mountains of Imperial County. The quarry is estimated to ...
The gypsum deposit at Lake MacDonnell is the largest in the Southern Hemisphere. Gypsum has been mined at Lake MacDonnell since 1919. [3] Since 1984 the mine has been owned by Gypsum Resources Australia (GRA), which is owned 50% each by USG Boral (itself a 50–50 joint venture of USG Corporation and Boral) and CSR Limited.