 Mr. Carne has observed, regarding the metalliferous veins of Cornwall, that it is a rare circumstance when a vein, which has been productive in one species of rock, continues rich long after it has entered into another; and this change, he adds, is even...  A Geological Manual - Page 492by Henry Thomas De La Beche - 1832 - 535 pagesFull view - About this book
 | Royal Geological Society of Cornwall - 1828 - 944 pages
...be rich on, or near, the lines of the junction of different rocks, it is rarely the case that a lode which has been productive in one rock, continues rich long after it has entered another. In many of the Gwennap mines the lodes which are rich in the killas do not usually continue... | |
 | Henry Thomas De La Beche - Geology - 1830 - 178 pages
...be rich on or near the lines of the junction of different rocks, it is rarely the case that a lode which has been productive in one rock, continues rich long after it has entered another." * * * * « It is evident that lodes are as much affected when a change takes place in the... | |
 | David Dale Owen - Geology - 1844 - 258 pages
...with a corresponding change in the productiveness of the lead veins. Mr. Came has observed, regarding the metalliferous veins of Cornwall, that it is a...circumstance when a vein which has been productive in one species of rock continues rich long after it has entered into another ; and this change, he adds, is... | |
 | William John Alden Bradford - Botany - 1846 - 322 pages
...a corresponding change in the productiveness of the lead veins. " Mr. Carne has observed, regarding the metalliferous veins of Cornwall, that it is a...circumstance when a vein, which has been productive in one species of rock, continues rich long after it has entered into another; and this change, he adds, is... | |
 | John Gregory (C.E.) - Industries - 1853 - 340 pages
...a glistening lustre, and a sub-crystaline aspect. It is asserted by an experienced miner, regarding the metalliferous veins of Cornwall, that it is a...circumstance, when a vein, which has been productive in one species of rock, continues rich long afte r it has entered into another, and this change is even remark... | |
 | United States. Congress. House - United States - 898 pages
...with a corresponding change in the productiveness of the lead veins. Mr. Carne has observed, regarding the metalliferous veins of Cornwall, that it is a...circumstance when a vein, which has been productive in one species of rock, continues rich long after it has entered into another ; and this change, he adds,... | |
 | 1835 - 886 pages
...the contents of the veins are not generally the same in the two rocks, but will be different in the one and the other. Mr. Carne has observed respecting...rock, should such rock become harder or softer, more or more compact. He admits that such changes are sometimes small, but states that the general fact... | |
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