colliee.1 LITERATURE OF TIN DEPOSITS. 57 
Ulke (Titus). A contribution to the geology of the Dakota tin mines: Eng. and 
Min. Jour., vol. 53, 1892, p. 547. 
Includes a brief description of the Archean rocks in which tin occurs, the mineral 
species found, and a discussion as to the origin of the tin-bearing granites. 
Ulke (Titus). The occurrence of tin ore at Kings Mountain, North Carolina, and 
near Vesuvius, Virginia: Mineral Kesources U. S. for 1893, U. S. Geol. Survey, 
1894, pp. 178-182. 
Describes the character of the country rock of the two localities, and the manner 
of occurrence of the tin ore. 
Weed (W. H.). The El Paso tin deposits: Bull. U. S. Geol. Survey, No. 178, 1891. 
Description of occurrence of cassiterite in Texas. 
