 Weed,5 in masses of nearly pure leadlike mineral 20 feet or more wide. In depth the mineral shows a more crystalline structure, and it is found in all the mines in greater or less abundance and purity, but in the great bulk of the ores it forms small...  Contributions to Economic Geology, 1902 - Page 178by Samuel Franklin Emmons - 1903 - 449 pagesFull view - About this book
 | Geological Survey (U.S.) - Geology - 1903 - 464 pages
...even rarer than the last-named mineral. Until 1900 copper glance constituted the most important oiv mineral of the veins, but it is now nearly equaled...it forms small grains scattered through the ores. Bornrte is less common than glance, and is practically restricted in occurrence to the veins in the... | |
 | Walter Harvey Weed - Copper mines and mining - 1907 - 402 pages
...mineral of the veins, but it is now nearly equaled in quantity by enargite. In the great orebodies of the upper levels of the Anaconda veins glance occurred in masses of nearly pure lead-like mineral 20 ft. or more wide. In depth the mineral shows a more crystalline structure, and it is found in all the... | |
 | Ulysses Sherman Grant, Daniel F. Higgins - Glaciers - 1913 - 800 pages
...great ore bodies of the upper levels of the Anaconda veins chalcocite occurred, according to Weed,5 in masses of nearly pure leadlike mineral 20 feet...it forms small grains scattered through the ores. Emmons, Weed, Tower, and many others who studied the copper lodes in the earlier stages of their development... | |
 | William Harvey Emmons - Chemistry, Inorganic - 1913 - 274 pages
...great ore bodies of the upper levels of the Anaconda veins chalcocite occurred, according to Weed,5 in masses of nearly pure leadlike mineral 20 feet...it forms small grains scattered through the ores. Emmons, Weed, Tower, and many others who studied the copper lodes in the earlier stages of their development... | |
 | Geological Survey (U.S.) - Geology - 1913 - 272 pages
...great ore bodies of the upper levels of the Anaconda veins chalcocite occurred, according to Weed,5 in masses of nearly pure leadlike mineral 20 feet...purity, but in the great bulk of the ores it forms small grams scattered through the ores. Emmons, Weed, Tower, and many others who studied the copper lodes... | |
 | Geological Survey (U.S.) - Geology - 1917 - 572 pages
...great ore bodies of the upper levels of the Anaconda veins chalcocite occurred, according to Weed,4 in masses of nearly pure leadlike mineral 20 feet...it forms small grains scattered through the ores. Emmons, Weed, Tower, and many others who studied the copper lodes in the earlier stages of their development... | |
 | William Harvey Emmons - Ore-deposits - 1917 - 574 pages
...great ore bodies of the upper levels of the Anaconda veins chalcocite occurred, according to Weed,4 in masses of nearly pure leadlike mineral 20 feet...it forms small grains scattered through the ores. Emmons, Weed, Tower, and many others who studied the copper lodes in the earlier stages of their development... | |
 | William Harvey Emmons - Geology, Economic - 1918 - 642 pages
...great ore bodies of the upper levels of the Anaconda veins chalcocite occurred in nearly pure masses 20 feet or more wide. In depth the mineral shows a...mines in greater or less abundance and purity, but as a rule it forms small grains scattered through the ores. The chalcocite ores are present in large... | |
 | William Harvey Emmons - Geology, Economic - 1922 - 548 pages
...great ore bodies of the upper levels of the Anaconda vein chalcocite occurred in nearly pure masses 20 feet or more wide. In depth the mineral shows a...mines in greater or less abundance and purity, but as a rule it forms small grains scattered through the ores. The chalcocite ores are present in large... | |
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