Proceedings of the second Pan American Scientific Congress, Washington, U.S.A., Monday, December 27, 1915 to Saturday, January 8, 1916 1915- 1916 v. 8U.S. Government Printing Office, 1917 |
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Häufige Begriffe und Wortgruppen
aceite acid ácido agua American amount años Argentina asfalto average bark beds bituminous Bolivia borato Brazil Buenos Aires cantidad capa carbon carnotite casi cent Cerro Chile ciento coal cobre coke Colombia color compañía contain copper Cordillera cost cual cuarzo cyanide depósitos deposits dirección district electric encuentran engine espesor estado están explosives explotación export extract feet field formación fuel furnace Geología Geological gold gramos hierro important industry manufacture material metal meters methods metros minas minas de oro mineral minerales Montevideo nitrate nitrate of soda norte operation partículas pequeña perborato Peru petróleo phosphate plant plata poco pounds present production punto pyrite quantity quebracho radium region República río rocas rock rubber Santa Catharina schists silver smelting sodio sólo South America tannin terreno tion tonelada tons trabajos United Uruguay veins Venezuela vetas yacimientos yareta zona
Beliebte Passagen
Seite 510 - Permanent partial disability means the loss of either one foot, one leg, one hand, one arm, one eye, one or more fingers, one or more toes, any dislocation where ligaments are severed, or any other injury Known in surgery to be permanent partial disability.
Seite 3 - Surgeon General, United States Army. WILLIAM H. HOLMES, Head Curator, Smithsonian Institution. HENNEN JENNINGS, Former President, London Institution Mining and Metallurgy.
Seite 556 - A great gold producing belt lies along the Pacific and reaches from California to Alaska, with local interruptions. These are the oldest deposits of early Cretaceous age and they have yielded vast placer or secondary deposits. The annual production including the placers, is not less than $40,000,000. Geologically they are connected with the intrusion of dioritic rocks, an intrusion extending like a gigantic dike along the Pacific Coast mountains. Throughout the interior part of the Cordilleran region...
Seite vii - Pursuant to the recommendation of the executive committee of the Second Pan American Scientific Congress, which was held in Washington December 27, 1915January 8, 1916, and by the cooperation of the United States Congress (urgent deficiency bill, Sept. 8, 1916), the papers and discussions of that great international scientific gathering have been compiled and edited for publication under the able direction of the Assistant Secretary General, Dr. Glen Levin Swiggett. In this volume is contained the...
Seite 558 - The South American Cordillera General Features. — From Cape Horn to Colombia the South American Cordillera or Andes forms a continuous chain closely following the coast. Its width ranges from 100 miles near Magellan Strait to 500 miles in the latitude of Bolivia. North of Bolivia it again contracts to a width of about 300 miles. It is thus, considering its length, a narrow mountain chain, but nevertheless generally made up of three longitudinal units. In the north they are known as the Eastern,...
Seite 557 - Igneous rocks, both flows and intrusions, abound in Mexico, and practically all of the deposits are of latest Cretaceous or of Tertiary age, thus on the whole more recent than many of those of Canada and the United .States. The most celebrated silver mines are of the type formed in or near volcanic flows near the surface: We need cite only Pachuca, Guanajuato, and Zacatecas; but there are hundreds of other similar districts. Of late the annual gold production has risen sharply to $20,000,000 or $25,000,000;...
Seite 556 - ... underlying the pre-Cambrian sediments and that only pegmatitic dikes and quartz veins reached up into the covering series.1 Similar geological conditions prevail in Rio Grande do Sul, beyond which the gold-bearing region continues into Uruguay, where the most southerly mines are found near Cunapiru. Uruguay yields annually up to $100,000 in gold. The most southerly representatives of this older class of gold deposits appear in the Sierras of the Pampas, for instance, in that extending from San...
Seite 564 - Potosi are shown, as the great mountain is penetrated by deep adits, to have been transformed into pyritic tinbearing veins. The silver production from this district is now of smaller moment than formerly. Chile Lack of statistical data makes it difficult to review at a distance the deposits of Chile. The republic of Chile, so progressive in other respects, has made little effort to study or keep account of its mineral deposits. The narrow strip of coast occupied by the republic is in few places...
Seite 563 - Sorata, which have yielded great amounts of gold since the time of the conquerors. There are many other localities south of this. Other placers have been worked recently on the San Juan River near the Argentine boundary. At the present time only two gold veins are worked, both in the eastern range and said to be of the " saddle reef " type inclosed in slates and sandstones.1 The quartz and free gold are accompanied by pyrrhotite, arsenopyrite, and pyrite.
Seite 562 - ... 300,000 kg. Of this again more than one-half is derived from the copper mines of Cerro de Pasco, a small amount from lead bullion, and the remainder from silver or gold-silver deposits. It is well known that Peru has yielded an enormous amount of silver. Professor Vogt has estimated 35,000,000 kg. as the production from 1533 to 1910. Whether this is accurate or not, it is certain that Cerro de Pasco has contributed the greater part of the silver of Peru. The silver districts are very numerous...