THE MINERALS OP IDAHO 23 



Koch, Louis A., A new occurrence of ptilolite. Amer. Mineralogist, vol. 2, 



pp. 143-144, 1917. 

 Julien, Alexis A., The volcanic tuffs of Challis, Idaho. (Abstract). New York 

 Academy of Sciences, Trans, vol. 1, pp. 49-56, 1882, Science, vol. 2, pp. 606-609, 

 1881. 

 44. Alder Creek (Lost River, White Knob). Cu, Au, Ag, Pb. Mackay Station, 

 O. S. L. R. R. 

 Paleozoic sediments, granite and porphyry. 

 Contact metamorphic. 

 Weed, W. H., the copper mines of the United States in 1905, Bull. 285, 



1906, p. 108. 

 Unipleby, J. B., Geology and ore deposits of the Mackay region, Idaho. 

 Prof. Paper 97, 1917. 



The genesis of the Mackay copper deposits, Idaho. Economic 



Geology, vol. 9, pp. 307-358, 593-594, 1914. 



Crystallized chrysocolla from Mackay, Ida. Wash. Acad. Sci. 



Journ., vol. 4, pp. 181-183, 1914. 



Schaller, W. T., and Larsen, E. S., Custerite, a new contact meta- 



morphic mineral. Amer. Journ. Sci., vol. 36, pp. 385-394, 1913. 

 Min. Res. 1905, p. 230. 



1906, p. 255. 



1907, pt. 1, p. 295. 



1908, pt. 1, p. 422. 



1909, pt. 1, p. 346. 



45. Bay Horse. Ag, Pb, Cu, Au., 76 miles NW. of Mackay, O. S. L. R. R. 

 Paleozoic sediments cut by granite. 



Veins and replacements. 

 Min. Res. 1887, p. 107. 



1905, p. 230. 



1906, p. 256. 



1908, pt. 1, p. 422. 



1909, pt. 1, p. 346. 



Umpleby, J. B., Ore deposits of northwestern Custer County, Idaho. Bull. 



539, pp. 59-76, 1913. 

 Bell, Robert N., The Ramshorn mine at Bayhorse. Mines and Minerals, 



vol. 21, pp. 174-176, 1900. 



46. East Fork. Pb, Ag, 24 miles west of Mackay, O. S. L. R. R. 

 Min. Res. 1908, pt. 1, p. 422. 



Umpleby, J. B., P. P. 97, pp. 103-106, 1917. 



47. Loon Creek (Casto, Lost Packer). Au, Ag, Cu. 125 miles NW. Mackay, 



0. S. L. R. R. 

 Precambrian sediments cut by granite and capped by rhyolite. 

 Veins. 

 Umpleby, J. B., A preliminary account of the ore deposits of the Loon 



Creek district, Idaho. Bull. 530, 1912. 

 Weed, W. H., The copper mines of the United States in 1905. Bull. 285, 



1906, p. 108. 

 Umpleby, J. B., Some ore deposits of NW. Custer Co., Idaho. Bull. 539, 



p. 94, 1913. 

 Min. Res. 1906, p. 256. 



1907, pt. 1, p. 295. 



1908, pt. 1, p. 422. 



1909, pt. 1, p. 346. 



