Bulletin, Ausgabe 13Geological Survey of Georgia., 1906 |
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4th district admixed Amer barite Bartow county Barytes Company Beaver limestone beds belt Blue Ridge Ocher calcined Cambrian Cartersville district cent chemical Cherokee Ocher color crude ocher crushed DEPOSITS OF GEORGIA dolomite east of Cartersville Emerson Engrs Etowah river exposed exposures feet ferric oxide formation fresh quartzite fresh rock Geological Survey Georgia Peruvian Ocher GEORGIA PLATE grade of ocher hard and fresh hard quartzite Hayes hematite impurities inclosed iron oxide irregular Knox dolomite limonite located manganese oxide masses metasomatism miles southeast mined mineral mode of occurrence N. P. Pratt Laboratory Ocher and Barytes ocher bodies Ocher Company's property ocher plant openings Paleozoic Peruvian Ocher Company portions pure ocher pyrite quantity quartz quartzite ridge refined ocher residual clays derived residual decay Ridge Ocher Company schists shales Short Tons silica slope southeast of Cartersville Survey of Georgia thickness town of Cartersville tunnels usually vitreous quartzite Weisner quartzite
Beliebte Passagen
Seite 26 - HAYES, CW Geological relations of the iron ores in the Cartersville district, Georgia. In Trans. Am. Inst. Min. Eng., vol. 30, pp. 403-419.
Seite 32 - In the next phase the ocher preponderates, but is held together by a more or less continuous skeleton of silica, although it can be readily removed with a pick. The final stage in the transition is the soft yellow ocher, filling the veins, which crumbles on drying, and contains only a small proportion of silica in the form of sand-grains.
Seite 74 - ... series of vats a short distance away where the ocher is allowed to settle. The water is in large part syphoned from the vats by means of rubber hose. After the ocher has settled and as much of the water syphoned off by the hose as possible, further expulsion of the water is by means of evaporation. The ocher is removed from the vats just as soon as it is stiff enough to handle. It is then placed on drying racks under the shed where the drying process is completed. The time required for evaporation...
Seite 61 - The intermediate zone between the pure ocher and the quartzite is usually a few inches in thickness, although it may be several feet between the extremes, and, on the other hand, sometimes only a fraction of an inch.
Seite 68 - Georgia. Up to this time the ocher had been dried with steam in large vats fitted with steam pipes along the bottom of the vats. Mr. Oram first introduced the natural process of air-drying, in vats dug in the ground. The capacity of the vats was a car-load or more of the ocher when dry. The two last plants established in the district, namely, the Blue Ridge Ocher Company, and The American Ocher Company, have not put in equipment for steam drying, but use only the natural or air-drying process. In...
Seite 59 - The more compact portions, which are only slightly stained with iron, are seen to be composed of a transparent ground-mass, threaded with minute cavities, which penetrate the rock in all directions and contain a fine dendritic growth of iron oxide. The latter occurs only rarely in isolated grains, but generally in clusters of minute grains or fibers, attached to each other and branching irregularly from a central stem.
Seite 23 - Westward the plain grades into the Knox dolomite plateau, a slightly more resistant magnesian limestone, whose general average elevation is but little above that of the Cartersville portion of the plain of the Paleozoic rocks.
Seite 61 - In the fresh rock the ocher forms a series of extremely irregular branching veins, which intersect this shattered quartzite without any apparent system. They frequently expand into bodies of considerable size; and when the ocher is removed, rooms 6 to 10 feet in diameter are sometimes left connected by narrow winding passages. The mining of the ocher has left the point of the ridge completely honey-combed with these irregular passages and rooms. The contact between the ocher and...
Seite 62 - Microscopic study of a large number of thin sections of the ocher charged quartzite collected from all parts of the area discloses with but few exceptions, either the former or the existing presence of pyrite. In many of the sections at least a part of the pyrite is entirely fresh and unaltered, but in a majority of them the pyrite has been completely oxidized leaving the original space occupied by the mineral only partially filled, as a rule, by its alteration product, iron oxide.
Seite 32 - ... color gradually fades and finally disappears in the absence of the yellow powder from the rock. Aside from the argillaceous matter or clay, the other impurities, silica and manganese oxide, exercise but little if any effect on the physical appearance of the pure ocher. Silica is constantly present ; but it is rarely sufficiently coarse-grained in the purer beds of ocher to impart any perceptible gritty "feel.