The Mexican mining journal . d on the railroad and must ship their products outand their supplies in on llama-back, mule-back, or incarts drawn by mules. The Bolivian Plateau is well-supplied with fair cart roads, but these rarely extendbut a short distance into the Main Range where mostof the mines are situated so that transportation isnecessarily largely upon the backs of animals. Llamascost about $15 apiece, find their own feed along thetrail, and carry loads ranging from 50 to 100 carry from 200 to 400 pounds, cost from $30 to$50, and require special feeding. The load a cart w
The Mexican mining journal . d on the railroad and must ship their products outand their supplies in on llama-back, mule-back, or incarts drawn by mules. The Bolivian Plateau is well-supplied with fair cart roads, but these rarely extendbut a short distance into the Main Range where mostof the mines are situated so that transportation isnecessarily largely upon the backs of animals. Llamascost about $15 apiece, find their own feed along thetrail, and carry loads ranging from 50 to 100 carry from 200 to 400 pounds, cost from $30 to$50, and require special feeding. The load a cart willcarry varies greatly with the road, great difficultybeing experienced in hauling even an empty cart onsome of the roads. Transportation by mule-back orcart is quicker than llama transportation but costsmore. Where the cart can be used, it has the advantageof being able to handle large pieces whole whichotherwise would have to be sectionalized. In figures 3and 4, pack train of llamas and mules bound for themines are (*) Director Mackey School of Mines, University ofNevada, Reno, Nevada. Llamas Transporting Mining Supplies in Bolivia All of the mines of Bolivia are situated at highaltitudes. There are two seasons, the rainy or summerseason from November to March, and the dry or winterseason from April to October. The total rainfall is onlyabout 30 inches per year, and this does not all fallduring the rainy season as there are occasional rainsthroughout the dry season. It is cool all the year, thedifference in temperature between seasons not beinggreat. The climate of those mines situated on the Bo- 87 THE MEXICAN MINING JOURNAL March. 1915. livian Plateau or at elevations not greatly exceedingthat is good, but the climate of the mines at elevationsof 15,000 feet and more in the Main Range is very badbecause of wind, cold, hail and snow. The altitude ofeven the lower mines seriously affects the comfortof most foreigners and prevents their exerting as greata mental or ph
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