154 KEMP'S ORE DEPOSITS. 



cite and barite have made the mine famous the world over. While 

 at one time a source of copper, for many years it has been unpro- 

 ductive. 1 



2.04.32. Example 21c. Chalcocite and copper carbonates re- 

 placing vegetable remains, etc., in the Permian or Triassic sand- 

 stones of Texas, New Mexico, and Utah. In the Permian of 

 northern central Texas are three separate copper-bearing zones, 

 forming three lines of outcrop that extend in a general north- 

 easterly direction over a range of about three counties. The ore 

 is largely chalcocite in beds of shale, and often replacing frag- 

 ments of wood. It may be available in time. 2 



At various places in Utah and New Mexico (Abiquiu, N. M., 

 Silver Reef, Utah) the sandstones, as reported by Newberry and 

 others, have copper ores disseminated through them and deposited 

 on fossils, at times with associated silver (Utah). The copper, 

 whether coming from the waters along the shore line or from sub- 

 terranean currents, was precipitated by the organic matter. (See 

 also under "Silver," in Utah.) These deposits are not yet sources 

 of copper. 3 



1 L. C. Beck, " Notice of the Native Copper Ores, Copper, etc., near 

 New Brunswick, N. J.," Amer. Jour. Sci., i., XXXVI. 107. G. H. Cook, Geol 

 of N. J., 1868, p. 675; also L. C. Beck, Ibid., 218-224. J. G. Percival, Rep. 

 on Geol. of Conn., p. 77. C. A. Shaeffer, "Native Silver in New Jersey 

 Copper Ore," Engineering and Mining Journal, February, 1882, p. 90. C. 

 Shepherd, Geol. of Conn., 1837, p. 47. B. Silliman and J. D. Whitney, 

 "Notice of the Geological Position and Character of the Copper Mine at 

 Bristol, Conn.," Amer. Jour. Sci., ii., XX. 361. J. D. Whitney, Metallic 

 Wealth. Rec. 



2 W. F. Cummins, " Report on the Permian of Texas and its Over- 

 lying Beds," First Ann. Rep. Texas Geol. Survey, p. 196. J. F. Furman, 

 " Geology of the Copper Region of Northern Texas and Indian Territory," 

 Trans. N. Y. Acad. Sci., 1881-83, p. 15. 



3 F. M. F. Cazin, "The Origin of the Copper and Silver Ores in Tri- 

 assic Sand Rock," Engineering and Mining Journal, April 30, 1880 ; Dec. 

 11, 1880, p. 331. "The Nacemiento Copper Deposits," Ibid., Aug. 22, 

 1885, p. 124. A. W. Jackson, Rep. Director of the Mint, 1880, p. 334. 

 J. S. Newberry, "Copper in Utah, Triassic Sandstones," Engineering 

 and Mining Journal, Vol. XXXI. , p. 5. Also Oct. 23, 1880, p. 269; 

 Jan. 1, 1881, p. 4. See also Tenth Census, Vol. XIII., Precious Metals, 

 pp. 40, 478. C. M. Rolker, "The Silver Sandstone District of Utah," 

 M. E., IX. 21. R. P. Rothwell, Quoted in Tenth Census, Vol. XIII., p. 



-478. B. Silliman, " The Mineral Regions of Southern New Mexico," M. E., 

 XVI, 427. 



