Gold And Silver; Comprising An Economic History of Mining in the United States, the Geographical And Geological Occurrence of the Precious Metals, With Their Mineralogical Associations, History And Description of Methods of Mining And Extraction of Values
Gold And Silver; Comprising An Economic History of Mining in the United States, the Geographical And Geological Occurrence of the Precious Metals, With Their Mineralogical Associations, History And Description of Methods of Mining And Extraction of Values
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In our eReader you can find the full English version of the book. Read Gold And Silver; Comprising An Economic History of Mining in the United States, the Geographical And Geological Occurrence of the Precious Metals, With Their Mineralogical Associations, History And Description of Methods of Mining And Extraction of Values Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Gold And Silver; Comprising An Economic History of Mining in the United States, the Geographical And Geological Occurrence of the Precious Metals, With Their Mineralogical Associations, History And Description of Methods of Mining And Extraction of Values
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The tendency then is to sort the materials entering the streams, each particular stream varying that action with its varying conditions of grade, width, depth and character of channel. Such variations are constantly happening at any particular place owing to changes in shape of channel and seasons. It is evident then that there will be a considerable overlapping of the grades of sorted products, including the accumulations of gold and associated minerals.
Disintegrated fragments of quartz-veins... entering a stream may be comparatively large fragments, pebbles or sands, which continue to be reduced in size by abrasion, thus gradually approaching the nor- mal specific gravity of the gold. The movement then of such a fragment under the action of running water becomes more and more retarded until freed of all adhering gangue it attains a maximum specific gravity, and a minimum volume, when it stops and is added to the accumulation in the bed of the stream, while the gangue passes on.
It has been observed that coarse gold tends to be concentrated on soft bed-rock in preference to hard.
What to read after Gold And Silver; Comprising An Economic History of Mining in the United States, the Geographical And Geological Occurrence of the Precious Metals, With Their Mineralogical Associations, History And Description of Methods of Mining And Extraction of Values?
You can find similar books in the "Read Also" column, or choose other free books by Crane, Walter R. (Walter Richard), B. 1870 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The tendency then is to sort the materials entering the streams, each particular stream varying that action with its varying conditions of grade, width, depth and character of channel. Such variations are constantly happening at any particular place owing to changes in shape of channel and seasons. It is evident then that there will be a considerable overlapping of the grades of sorted products, including the accumulations of gold and associated minerals.
Disintegrated fragments of quartz-veins... entering a stream may be comparatively large fragments, pebbles or sands, which continue to be reduced in size by abrasion, thus gradually approaching the nor- mal specific gravity of the gold. The movement then of such a fragment under the action of running water becomes more and more retarded until freed of all adhering gangue it attains a maximum specific gravity, and a minimum volume, when it stops and is added to the accumulation in the bed of the stream, while the gangue passes on.
It has been observed that coarse gold tends to be concentrated on soft bed-rock in preference to hard.
What to read after Gold And Silver; Comprising An Economic History of Mining in the United States, the Geographical And Geological Occurrence of the Precious Metals, With Their Mineralogical Associations, History And Description of Methods of Mining And Extraction of Values?
You can find similar books in the "Read Also" column, or choose other free books by Crane, Walter R. (Walter Richard), B. 1870 to read onlineMoreLess
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