SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 58 



MEXICO (Continued) 



758. . Tin in Mexico. 



Eng. Mg. Journ., Vol. 80, 1905, New York, pp. 519-520, 1500 words. 



" The tin properties now under development are 5 in number: La Esperanza, Tinnit, 

 La Santa (sic) Francisco, La Minita and Los Dos Amigos. The tin at La Hsperanza 

 occurs in threads or stringers in the vein. When development work was started on 

 property, the first stringer discovered was only 1-64 inch thick, but in uncovering the 

 vein, stringers ranging from *4 to % inch thick were encountered and about 800 

 pounds of tin ore running 75 per cent tin was taken out. An assay across the vein 

 runs from 2 to 4 per cent tin, while the ore as sorted by natives runs from 55 to 65 

 per cent and by concentration it can be brought up to 75 or 85 per cent tin. 



759. . Mexico's first tin ingot. 



Mo. Bull. Int. Bur. Amer. Repub., Vol. 21, Sept. 1905, Washington, D. C., p. 802. 



States that although stream tin has been produced in Mexico for many years, the 

 first ingot of lode tin has only recently been smelted. Gives a few details of a tin 

 deposit at Aguas Calientes. 



760. - . Tin in Mexico. 



Mg. World, Vol. 25, 1906, Chicago, p. 301. 



" The tin-bearing area extends from south of Aguas Calientes to north of Duran?o 

 on the eastern side of the Sierra Madre range. The localities are widely separated 

 and according to reports, quite different in geology and ore occurrence." 



761. BARCENA, MARIANO. Tratado de geologia elementos aplicables la agri- 



cultura, & la ingenieria a la industria. 



Bol. Seer. Fom. 1886, Mexico, p. 146. 



Tin occurs in veins in Mesa de los Caballos in Zacatecas, and in alluvium in Lagos 

 and other localities. 



762. BARRIGA, MANUEL DIAZ. Mining in Mexico. 



Mg. Journ. Railw. Comm. Gaz., Vol. 77, 1905, London, p. 631. 



Tin bearing ground is found in many portions of the Republic, but the deposits of 

 the Coneto region in Durango are the most important. Occur in calcareous trachite. 

 Concentrated ores, mostly in form of oxides, yield from 35 to 75 per cent of metal. 



BECK, RICHARD. See No. 1299. 



763. BENEDICT, WM. DE L. Tin in Mexico. 



Min. Ind. for 1892, Vol. 1, 1893, New York, pp. 451-452. 



" Tinstone has been found in Mexico at numerous widely separated localities. 

 None of the deposits have been systematically or extensively exploited except those 

 of Durango, where the ore is found to occur in small but frequently very rich pockets 

 in ill-defined veins in trachite-porphyry, which is the common country rock." 



764. BERGEMANN, C. Zinnstein von Xeres in Mexico. 



Neues Jahrb. Min. 1857, Stuttgart, p. 395. 



Gives an analysis of tin ore from Xeres, Mexico. 



765. BRETHERTON, H. G. The tin deposits of Mexico. 



Mg. World, Vol. 27, 1907, Chicago, pp. 685-686. 



" Notes on the history and present standing of the tin deposits which are situated 

 in and about the border region between the states of Jalisco and Aguas Calientes." 



766. BROMLY, A. H. Tin mining and smelting at Santa Barbara, Guanajuato, 



Mexico. 



Trans. Amer. Inst. Mg. Eng., Vol. 36, 1906, New York, pp. 227-233, figs. 2. 

 Mg. Journ. Railw. Comm. Gaz., Vol. 78, 1905, London, pp. 121, 139. 



