Gold Mines and Mining in California: A New Gold Era Dawning on the State, Progress and Improvements Made in the Business ...

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G. Spaulding & Company, 1885 - 349 strani
 

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Stran 6 - It is bounded on the north by Oregon, on the east by Nevada and Arizona, on the south by Lower California, and on the west by the Pacific Ocean.
Stran 18 - The mining interest in California is of great importance, and I have the satisfaction of assuring you that it forms one of the most valuable resources of that department. Besides the silver mines which are found there, and various other mines which have actually yielded metals, the gold placer, especially, is worthy of great attention, which extending nearly thirty leagues, was discovered lately, together with mines of mineral coal. It is painful for me to have to confess that mining is in a worse...
Stran 327 - This was to frame timbers together in rectangular sets, each set being composed of a square base, placed horizontally, formed of four timbers, sills, and crosspieces from 4 to 6 feet long, surmounted at the corners by four posts from 6 to 7 feet high, and capped by a framework similar to the base. The...
Stran 20 - There Is no doubt but that gold, silver, quicksilver, copper, lead, sulphur, and coal mines are to be found all over California, and it is equally doubtful whether, under their present owners, they will ever be worked.
Stran 68 - ... out and buried up. Among the causes directly implicated in the production of these changes, floods, and volcanoes; the disrupting, comminuting, and transporting power of icebergs and glaciers; local uplifts and subsidence of the earth's surface; ocean surfs and tides, and the erosive effect of running water, were the most widely prevailing and potent; many of these agencies having succeeded each other in regular order, and remained active throughout long periods of time. When we reflect that...
Stran 328 - The cappieces forming the top of any set were at the same time the sills or base of the next set above. These sets could readily be extended to any required height and over any given area, forming a series of horizontal floors, built up from the bottom sets like the successive stories of a house. The spaces between the timbers were filled with waste rock or with wooden braces, forming a solid cube whenever the maximum degree of firmness was desired. By adjustments of these sets the ore bodies along...
Stran 129 - ... over and washed the next year. To this circumstance is due, in part, the uneven annual productions observable in the foregoing table. The Bald Mountain Company, it is calculated, have enough gravel left within the limits of their claim to keep them profitably employed for another nine years at least. REMOVING THE GRAVEL FROM THE MINE. Where the gravel from drift mines is to be brought to the surface through vertical or inclined shafts, the kind of motive power to be used for that purpose depends...
Stran 97 - The channel is 500 feet wide; the grade, 50 feet to a mile; the rim-rock, 100 feet high on the east and 20 on the west, on an average. The deposit of gravel is 100 feet deep. It is white near the top ; red, blue, and black at the bottom. There are many boulders...
Stran 18 - Not long after this he again wrote: " The mineral interest in California is of great importance, and I have the satisfaction of assuring you that it forms one of the most valuable resources of the Department.

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