322 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 58 



MEXICO (Continued) 



776. Ingaixs, Walter Renton. Tin deposits of Durango, Mexico. 



Eng. Mg. Journ., Vol. 59, 1895, New York, p. 293. 



This paper is based on a study of mines of Mexico in 1892. Deposits at Potrillos and 

 Cac.lria are dscribed. A table of 10 analyses made by Dr. Genth on Mexican 

 tin ore — half from Potrillos, remainder from CacSria — is given. 



777. . The tin deposits of Durango, Mexico. 



Trans. Amer. Inst. Mg. Eng., Vol. 25, 1896, Now York, pp. 146-163, map 1, figs. 2. 



Treats of early tin mining in Mexico, and especially of the physical characteristics, 

 geology, and occurrence of tin at Potrillos, Cacflria and Ccrro de Iglesia dc los 

 Remedies, tin regions of Durango. 



Discussion by C. W. Kempton, pp. 997-998. (See No. 779.) Additional notes. Vol. 27, 

 1897, pp. 428-429. 



778. . Notes on the tin deposits of Mexico. 



Trans. Amer. Inst. Mg. Eng., Vol. 27, 1897, New York, pp. 428-429. 

 Some additional notes on tin localities in Mexico, mentioned in paper " Tin 

 deposits of Durango " in Trans. Amer. Inst. Mg. Eng., Vol. 25, New York, p. 146. 



Kemp, Jas. F. 8ee No. 1213. 



779. Kempton, C. W. The tin deposits of Durango, Mexico. 



Trans. Amer. Inst. Mg. Eng., Vol. 25, 1896, New York, pp. 997-908. 

 In discussion of pajjer on same subject by W. R. Ingalls (No. 777), mrniions an 

 occurrence of tin placers at Sain Alto, Zacatecas, Mexico. 



Lock, C. G. Warnford. See No. 1338. 



Louis, Henry. See No. 1340. 



780. Manzano, Jesus P. The mineral zone of Santa Maria del Rio, San Luis 



Potosi, Mexico. 



Trans. Amer. Inst. Mg. Eng., Vol. 32, 1901, New York, pp. 481-482. 

 Description of tin ores and occurrences, and output of several mines. Deposits 

 generally small. Country poorly forested. 



781. Nevius, J. Nelson. The Sain Alto tin deposits (Mexico). 



Eng. Mg. Journ., Vol. 75, 1903, New York, p. 929, fig. showing tin smelter. 



Digest: Geol. Centr., Vol. 5, 1904, Leipzig, p. 437. 



The eassiterite occurs in rhyolite, associated with chalcedony. As the rock 

 weathers the eassiterite nodules are washed out and concentrated in the ravines 

 where they are collected. The method of smelting the ores is also described.— H. Ries. 



782. Newland, D. H. Tin in Mexico. 



Min. Ind. for 1903, Vol. 12, 1904, New York and London, pp. 331-332. 

 Sain Alto deposits described. Output amounts to a few tons a year. Grade of ore 

 as smelted is nbout 40 per cent metallic tin. 



PiBSSON, L. V. See No. 1635. 



Pratt, Joseph Hyde, and Sterrett, Douglass B. See No. 252. 



783. Richthofen, F. Ueber' das Alter der goldfiihrenden Gange und der 

 von ihnen durchsetzten Gesteine. 



Zeitschr. deutsch. geol. Ges., Vol. 21, 1869, Berlin, p. 737. 

 A foot note describes the tin ore at Durango. 



Rolker, Chas. M. See No. 1357. 



784. Wilson, Geo. Tin and petroleum in Mexico. 



Eng. Mg. Journ., Vol. 34, 1882, New York, p. 280. 



