2 CO KEMP'S ORE DEPOSITS. 



but not enough for profitable mining. Blake thinks that the ore 

 has crystallized from descending solutions. Eruptive rocks are 

 present above the sandstones. 



2.14.08. An interesting deposit of senarmontite was worked 

 for a time in Sonora, just south of the Arizona line, but it was 

 soon exhausted. 1 



ARSENIC. 



2.14.09. This metal occurs with many silver ores in the West 

 and in arsenopyrite, or mispickel, a not uncommon arseno-sulphide 

 in the gold quartz veins, east and west. At the Gatling mines, in 

 the town of Marmora (more lately called Deloro), in Hastings 

 County, Ontario, auriferous mispickel occurs in great quantity in 

 granite, in veins with quartz gangue. Considerable oxide of arsenic 

 has been obtained in the past from the roasters, but for five years 

 or more the mines have not been productive. For reference to the 

 printed descriptions see under "Gold in Canada" (2.13.07). 



BISMUTH. 



2.14.10. Bismuth occurs with certain silver ores in the San 

 Juan district, Colorado, and is referred to in describing the country 

 under "Silver and Gold" (2.09.10). Lane's mine, at Monroe, 

 Conn., has furnished museum specimens of native bismuth in 

 quartz. Some neighboring parts of Connecticut have afforded 



1 General references : W. P. Blake, " General Distribution of Ores 

 of Antimony," Mineral Resources of the U. S., 1883-84, p. 641. Arkan- 

 sas : T. B. Comstock, Geological Survey of Arkansas, 1888, I., p. 136. 

 F. P. Dunnington, " Minerals of a Deposit of Antimony Ores in Sevier 

 County, Arkansas," A. A. A. S., 1877. Rec. J. W. Mallet, Chemical 

 Neu-s, No. 533. C. E. Waite, ''Antimony Deposits of Arkansas," J\L E., 

 VII. 42, C. P. Williams, " Notes on the Occurrence of Antimony in Ar- 

 kansas," M. E., III. 150. California : W. P. Blake, " Kern County," U. S. 

 Pac. R. R. Explorations and Survey, Vol. V., p. 291. H. G. Hanks, Rep. 

 Col. State Mineralogist, 1884. See also subsequent reports by William 

 Irelan, Jr. Mexico : E. T. Cox, " Discovery of Oxide of Antimony in So- 

 nora," Amer. Jour. Sci., XX. 421. J. Douglass, "The Antimony Deposit of 

 Sonora," Engineering and Mining Journal, May 21, 1881, p. 350. Nevada: 

 Engineering and Mining Journal, 1892, p. 6. New Brunswick : L. W. 

 Bailey, " Discovery of Stibnite in New Brunswick," Amer. Jour. Sci., ii., 

 XXXV. 150, and in Rep. on the Geol. of New Brunswick, 1865 ; also H. Y. 

 Hind, in the same. Utah: D. B. Huntley, Tenth Census, Vol. XIII., 

 p. 463. 



