GYPSUM DEPOSITS OF NEW YORK 



55 



tramce is had to the mine by means of a shaft 60 feet deep. This 

 shaft is divided into three compartments, one 5 by 8 feet for air 

 passage and stairway ; one 6 by 8 feet for passenger elevatoir ; and 

 one 6 by 8 feet accommodating the bucket elevator. Mining is 

 carried on underground much as in coal mines, the most approved 

 methods being employed to secure economy and safety. The gang- 





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Fig. s Map of the surface plant anrl underground wordings of ihe Ameri.an Gypsum Co.. 



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ways arc carried 6 feet higli and arc wide enough to admit of 

 using the 2 feet of barren rock taken from below the gypsum 

 bed for a supporting wa'll on either s.ide of the gangway. The 

 rooms are driven 24 feet wide Iw 300 feet long and their hight is 

 simply the t'hickness of the vein, or 4 feet. Pillars 24 feet wide 

 and alternately 40 or 60 feet long are left, each lieing separated by 



