THE MINING AND QUARRY INDUSTRY I9II 



35 



that the period of rapid expansion marking the development stage 

 of the gypsum industry is probably over and that progress hence- 

 forth will be slower and less constant than in the past. 



The output based on the crude rock mined or quarried last year 

 amounted to 446,794 short tons. The corresponding total for the 

 preceding year was 465,591 short tons, showing a decrease of 18,797 

 short tons, compared with a gain of 87,359 tons in 1910. With the 

 one exception the product last year was the largest on record. 



Of the total as given about 70 per cent was consumed by the local 

 calcining plants operated in connection with the mines for the 

 manufacture of plaster of paris and wall plasters. The reports of 

 these plants showed a production of 262,249 tons of calcined 

 plasters with a value of $871,106. The outturn for 1910 was 

 250,228 tons valued at $838,340. The quantity of gypsum ground 

 for land plaster was reported as 9959 tons valued at $18,508, against 

 12,597 tons valued at $28,100 in 1910. The sales of crude or lump 

 gypsum, chiefly to portland cement works, accounted for 144,035 

 tons valued at $202,984, as compared with sales of 178,518 tons 

 valued at $256,512 in the preceding year. 



Production of gypsum 



The output of gypsum and gypsum products as given was 

 reported by 14 firms and was divided among the five counties of 

 Onondaga, Cayuga, Monroe, Genesee and Erie. The greater 

 quantity of rock was obtained in the western section where it found 

 use mainly in the production of calcined plasters. 



In Onondaga county there was less activity than usual. The 



Fayetteville Gypsum Co. produced most of the crude gypsum 



obtained in the county and shipped the output to New York City 



for calcination. The property operated by the company was the 



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