NO. 2 BIBLIOCilUrilY OF TIX — IIESS 153 



SOUTH DAKOTA (Continued) 



Gives a short history of the discovery of tin in the Black Hills and tlic efforts 

 to mine it. States that cassiterite occurs at Nigger Hill in Cambrian pegmatitie 

 granite which is an inclusion in Tertiary acid porphyry. Columbite, tantalite, tour- 

 maline, and wolframite accompany the cassiterite. The cassiterite is irregularly dis- 

 tributed through the granite, .nnd may possibly be mined on a small scale at a 

 profit. 



Says topaz accompanies stream tin in the creeks of the area. 



1011. . The ore deposits of the Northern Black Hills. 



Mg. Rep. Vol. 50, 1904, Denver, pp. 430-431. 



Some tin occurs in the Algonkian schists. " The tin ore also occurs in placers as 

 stream gravels, derived from distintegration of the country rock containing tin. The 

 cassiterite in these gravels is but little rounded and differs in its black color from the 

 reddish brown t.vpo of stream tin." See No. 1010. 



1012. M , H. Tin mines in the Black Hills of Dakota. 



Mg. Journ. Railw. Comm. Gaz., Vol. 61,* 1891, London, p. 694. 



Extracts from report of English Consul at Chicago. Speaks of tin outlook as very 

 encouraging from various reports of experts. Describes deposits chief of which are 

 found in Custer and Pennington counties, as veins, varying from a foot to more than 

 300 feet in width, and in length from a few yards to 5 miles. Outcrops are from a 

 few feet to 1.50 feet above surface. Abundant fuel at hand. 



1013. Morse, Arthcr J. The Harney Peak tin mines. 



Eng. Mg. Journ. Vol. 58, 1894, New York, p. 463. 



Summary of surface developments. .Says surface indications are not liorne out in 

 depth. Describes and gives illustration of pinching out of " greisen " band, and says 

 quartz veins de the same. 



1014. O'Harra, Cleophas C. The mineral wealth of the Black Hills (South 



Dakota). Tin. 



South Dakota, Geol. Surv. Bull. No. 3, Mineral Resources of South Dakota, 1902, 

 Vermillion, pp. 62-67. 



Gives a general sketch of the geology of the Black Hills and describes the occur- 

 rence of the minerals. 



Rosen, Peter. See No. 1000. 



1015. S(T0RMS?), W. H. Bear Gulch tin district, South Dakota. 



Mg. Sci. Press, 'V'ol. 86, 1903, San Francisco, pp. 198-199. 



This district is of unusual interest, as in it occur both mines of gold and tin. 

 Tlie gold miners were greatly hampered in their sluicing, by the abundant occurrence 

 of black sand and small pebbles of high specific gravity which filled riffles and caused 

 loss of gold. About 1880 it was discovered that this sand — at least part of it, was 

 cassiterite. Other minerals of economic importance in this district are, wolframite 

 and columbite-tantalite. 



1016. Sadtler, B. Gold and tin in Northwestern Black Hills. 



Mg. World, Vol. 25, 1906, Chicago, pp. 520-522, sections 5. 



Editorial on same: Ibid., p. 517. 



Treats of gold and tin bearing districts in Crook Co., Wyoming, and Lawrence Co., 

 South Dakota. " The district shows proper geologic conditions being identical with 

 the historic Deadwood district, with addition of a large belt of tin veins. It is 

 admirably located as regards wood, water and all necessary supplies, as well as being 

 within the reach of railroads. It has exposed and partly developed large bodies of 

 gold and tin ore in vein, and large and quickly available amounts of the same metals 

 in placers, all of pay grade. Incidental to the extraction of the above metals, mica 

 and tungsten form a probable source of income," 



