Пошук Зображення Карти Play YouTube Новини Gmail Диск Більше »
Увійти
Книги Книги
" In general it may be said that all the veins of the district carry rich ores in bonanzas and ore shoots within the first 200 feet from the surface, but that in depth the ores rapidly decrease in value until the vein is no longer workable. It may also... "
Geology of the Marysville Mining District, Montana: A Study of Igneous ... - Сторінка 105
автори: Joseph Barrell - 1907 - 178 стор.
Повний перегляд - Докладніше про цю книгу

Bulletin, Випуски 213 – 215

1903 - 988 стор.
...3,000 feet horizontally and to a depth of 1,<HX) feet, but no ore was found below the 1,000-foot level. This vein, which is the largest and the most productive...dip of the vein. The ores consist of sulphides and snlpliaiitimonidcs uf silver, with gold aggregating (io per cent of the total value. In the upper levels...
Повний перегляд - Докладніше про цю книгу

Contributions to Economic Geology, 1902

Samuel Franklin Emmons - 1903 - 462 стор.
...feet horizontally and to a deptli of 1,000 feet, but no ore was found below the 1,000- foot level. This vein, which is the largest and the most productive...sulphides and sulphantimonides of silver, with gold aggregating (50 per cent of the total value. In the upper levels the ore is somewhat oxidized, and...
Повний перегляд - Докладніше про цю книгу

Bulletin of the United States Geological Survey

Geological Survey (U.S.) - 1903 - 464 стор.
...3,000 feet horizontally and to a depth of 1,iJOO feet, but no ore was found below the 1,000-foot level. This vein, which is the largest and the most productive...dip of the vein. The ores consist of sulphides and sulphantimouides of silver, with gold aggregating i»0 per cent of the total value. In the upper levels...
Повний перегляд - Докладніше про цю книгу

Professional Paper - United States Geological Survey, Випуск 57

Geological Survey (U.S.) - 1907 - 234 стор.
...in the district, consists in its lower levels of a mass of angular rubbish, derived from the walla of the fissure, and in places cemented by quartz,...sulphides and sulphantimonides of silver, with gold aggregating" 60 per cent of the total value. In the upper levels the ore is somewhat oxidized and in...
Повний перегляд - Докладніше про цю книгу

Bulletin of the United States Geological Survey

Geological Survey (U.S.) - 1913 - 272 стор.
...and to a depth of 1,600 feet, but no ore was found below the 1,000-foot level. According to Weed3 — In general, it may be said that all the veins of the...sulphides and sulphantimonides of silver, with gold aggregating 60 per cent of the total value. In the upper levels the ore is somewhat oxidized and in...
Повний перегляд - Докладніше про цю книгу

Coastal Glaciers of Prince William Sound and Kenai Peninsula, Alaska

Ulysses Sherman Grant, Daniel F. Higgins - 1913 - 800 стор.
...to a depth of 1,600 feet, but no ore was found below the 1 ,000-foot level. According to Weed3 — In general, it may be said that all the veins of the...matter barren and unworkable. The pitch of the ore eho';ts conforms to the usual habit, dipping to the right when looking down the dip of the vein. The...
Повний перегляд - Докладніше про цю книгу

The Enrichment of Sulphide Ores

William Harvey Emmons - 1913 - 274 стор.
...below the 1,000-foot level. According to Weed2 — In general, it may be said that all the veins of tho district carry rich ores in bonanzas and ore shoots...matter barren and unworkable. The pitch of the ore shouts conforms to the usual habit, dipping to the right when looking down the dip of the vein. The...
Повний перегляд - Докладніше про цю книгу

Bulletin of the American Institute of Mining ..., Випуски 92&nbsp;–&nbsp;96

1914 - 1346 стор.
...fissure, and in places cemented by quartz, in other places still retaining its original character. It may also be said that the ore shoots were well...right when looking down the dip of the vein. " The walls are usually indistinct in the productive parts of the lode, but in the barren portions they are...
Повний перегляд - Докладніше про цю книгу

Bulletin of the American Institute of Mining and ..., Випуски 91&nbsp;–&nbsp;96

1914 - 1444 стор.
...fissure, and in places cemented by quartz, in other places still retaining its original character. . It may also be said that the ore shoots were well defined the intervening vein matter barren and unworkable. The pitch of "^Vie ore shoots conforms to the usual...
Повний перегляд - Докладніше про цю книгу

Transactions of the American Institute of Mining, Metallurgical and ..., Том 49

American Institute of Mining, Metallurgical, and Petroleum Engineers - 1915 - 878 стор.
...fissure, and in places cemented by quartz, in other places still retaining its original character. . . . . It may also be said that the ore shoots were well...right when looking down the dip of the vein. " The walls are usually indistinct in the productive parts of the lode, but in the barren portions they are...
Повний перегляд - Докладніше про цю книгу




  1. Моя бібліотека
  2. Довідка
  3. Розширений пошук книг
  4. Завантажити ePub
  5. Завантажити файл PDF