18 CEMENTS, LIMES, AND PLASTERS. 



in one bed, which varies from 10 to 25 feet in thickness. It has been 

 extensively worked, eight plaster-mills being now in operation in the 

 district. 



Kansas. "The gypsum of Kansas consists of extensive beds of 

 rock gypsum and a number of deposits of secondary gypsum, or gypsite. 

 Some of the rock gypsum is suited to the manufacture of the finer grades 

 of plaster of Paris, and the gypsite is particularly adapted for wall and 

 cement plasters. There is a sufficient quantity of the gypsite now 

 known to permit extensive operations for a number of years. Certain 

 of the deposits, however, have shown signs of exhaustion, and have 

 been abandoned. It is probable that others will be discovered, as there 

 is a demand for further development of the industry. The rock-gypsum 

 beds are so vast in their proportions that only those which are favorably 

 situated with respect to transportation facilities will probably be worked. 



"The area in which gypsum is found is an irregular belt extending 

 northeast and southwest across the State, as indicated on the accom- 

 panying map of Kansas (Fig. 2). It is naturally divided into three 

 districts, which, from the important centers of manufacture, may be 

 named the northern or Blue Rapids area, in Marshall County; the central 

 or Gypsum City area, in Dickinson and Saline counties ; and the southern 

 or Medicine Lodge area, in Barber and Comanche counties. A number 

 of small areas have been developed between these, connecting more 

 or less closely the three main areas. The gypsum is found at Manhattan 

 and north of that city, though not worked. It is worked at Langford, 

 in the southern part of Clay County, and is found near Manchester, 

 in the northern part of Dickinson County. Gypsum is worked near 

 Burns, and has in past years been worked near Peabody and Furley, 

 and large deposits are known near Tampa. Farther south, in Sumner 

 County, a large mill has been operated at Mulvane, and gypsum has 

 been quarried at Geuda Springs. These different localities show an 

 almost continuous belt of gypsum across the State." 



Michigan. Gypsum is at present worked in two distinct areas in 

 Michigan, while a third locality may prove to be of importance in the 

 future. The two producing areas are (1) in the vicinity of Grand Rapids; 

 and (2) at Alabaster, near Saginaw Bay. The third, and as yet unex- 

 ploited, area is near St. Ignace, on the Upper Peninsula. 



Montana. Gypsum is worked for plaster in Cascade and Carbon 

 counties, and is known to occur at many other localities in the State. 



Nevada. At Moundhouse and Lovelocks, in northwestern Nevada- 

 gypsum deposits have been developed. Large deposits also occur in 

 southern Nevada. 



