NO. 2 BIBLIOGRAPHY OF TIN^ — HESS 43 



BOLIVIA (Continued) 



depends upon rainfall, since absence of grass paralj'zes transport which is carried 

 on by mules and llamas. The labor problem is one of great difficulty. With 

 present price of tin, all mines are worked to limit; but it is improbable that 

 there will be an increase in production in the near future owing to the excessive 

 difficulties here encountered. 



174. . Tin mining in Bolivia. 



Amer. Mg. Rev., November 7, 190S, Los Angeles, p. 1, pi. 1. Abstract of paper 

 read beofre Roy. Cornwall Polyt. Soc. of England. 

 Briefly describes the tin mines and mining' conditions existing in Bolivia. 



. See No. 467. 



Penfikld, S. L. See No. 1631. 



PiiiLi^iPS, J. A., and Louis H. See No. 1350. 



175. Preumont, G. The Bolivian tin mining industries and railways. 



Mg. Journ. Railw. Conim. Gaz., Vol. 83, 1!X)S, London, pp. 5-G, 65-06. 



Bolivia presents after the Malayan States the most interesting field for tin mining. 

 Since ore occurs mostly in lodes, it has, in many respects an advantage over those 

 countries depending on alluvial grounds, which are rapidly becoming depleted. 

 Most of the mines are comparatively yet in virgin ground. The possibility of the 

 output increasing rapidly, is largely dependent on better and cheaper methods of 

 transportation. Hence the outlook for railway development is treated at length. 



176. . Northern tin fields of Bolivia. 



Mg. Journ. Railw. Comm. Gaz., Vol. 83, 1908, London, pp. 160, 249, 314. 



Gives location, geographic and climatic description of country in which tin 

 deposits occur. The tin-bearing lodes seem to bear no direct relation to the 

 granite core of the mountains, but occur in quartzite on their western flanks. 

 This quartzite is neither very continuous nor very wide, but all areas of it have 

 been found to be stanniferous. The tin fields of Milluni, Quimsa Cruz, Araca and 

 Ichoea occur in such areas. Describes in detail the Iluaina-Potosi, Milluni, Araca, 

 Quimsa Cruz, and Santa Vela Cruz fields. 



Prior, G. T. See No. 1636. 



Describes teallite. 



177. PuNNETT, H. Macauley. The tin deposits of Bolivia. 



Mg. Journ. Railw. Comm. Gaz., Vol. 33, 1863, London, pp. 403, 443, 479, 498, 554. 

 Enumeration and description of principal tin districts of Bolivia and mSdes of 

 working mines, crushing and washing of ores. 



RoLKER, CiiAS. M. See No. 1357. 



178. Roberts, Malcolm. Chorolque tin mines and alluvial deposits, Bolivia. 



Trans. Inst. Mg. Met., Vol. 9, 11>UO-1901, London, pp. 372-376. 

 Geography, geology, mineralogy; description of the mines and their working, also 

 a description of the alluvial deposits. 



179. . Notes on Chorolque tin mines and alluvial deposits, Bolivia. 



Trans. Inst. Mg. Met., Vol. 12, 1Wj2-1;M)3, London, pp. 404-405. 



Additions to paper in Trans. Inst. Mg. Met., Vol. 9, 19001901, London, pp. 

 372-376, giving further details of the geology. 



180. Romana, Euuaruo A. L. ue. Una inspecion de los yacimientos de estano 



de Bolivia y una exploracion per el mismo metal en el Perti. 



Boletin Cuerpo de Ingonieros de Minas del Pert! No. 57, 1W)8, Lima, pp. 99, figs. 26, 

 maps 2.. 



