THE MINING AND QUARRY INDUSTRY I9IO 



31 



became productive during the past year and the increase came from 

 enlarged operations on the part of enterprises already well estab- 

 lished. 



The output of rock or crude gypsum in 1910 was 465,591 short 

 tons and the value of the marketed products as reported by the 

 producing companies amounted to $1,122,952. The product in the 

 preceding year was 378,232 short tons valued at $907,601. The 

 actual gain for the year was thus 87,359 short tons in production 

 and $215,351 in value. In the period since 1904 for which statistics 

 have been collected by this office the production has expanded by 

 more than 200 per cent. 



The accompanying table gives the statistics for gypsum for the 

 last two years. The figures are those returned by the mining com- 

 panies. It may be noted that the items for calcined and ground 

 plasters as given in the table probably fall a little below the actual 

 amounts made from local materials, since some of the crude gypsum 

 is sold to plaster mills outside of the mining district. The output 

 of calcined plasters, including plaster of paris and wall plaster, on 

 the above basis amounted in 1910 to 250,228 short tons with a value 

 of $838,340. In 1909 the output was 209,223 short tons valued at 

 $699,110. The amount ground for land plaster was 12,597 short 

 tons valued at $28,100 against 9468 short tons valued at $19,283 

 in the preceding year. The sales of crude or lump gypsum, chiefly 

 to Portland cement works, amounting to 178,518 short tons valued at 

 $256,512 as compared with 126,606 short tons valued at $189,208 

 in 1909. 



Production of gypsum 





1909 



I9IO 





SHORT TONS 



VALUE 



SHORT TONS 



VALUE 



Total output, crude. . . . 

 Sold crude 



378 232 

 126 606 



9 468 

 209 223 





465 591 



178 518 



12 597 

 250 228 





I189 208 



19 283 



699 1 10 



$256 512 

 28 100 



838 340 



Ground for land plaster. 

 Wall plaster, etc., made. 



Total value 





I907 601 





$1 122 952 









