Mineral Resources of Virginia |
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Alumina Amelia county analyses argillaceous limestone Augusta county barite beds belt Blue Ridge Buckingham county calcareous Calcium carbonate Cambrian Campbell cent chert Chesapeake clay coal Coastal Plain Coke color Company composition copper creek crystalline deposits depth dolomite east fault feet feldspar formation fossil furnace gossan granite gray gypsum hematite inches Iron oxide James river Lime CaO limestone limonite located Louisa county Magnesium carbonate magnetite Manganese manufacture Metallic iron mica miles south mill MINERAL RESOURCES mines Mountain Nelson county northeast occurs ocher opened operated Ordovician Oriskany outcrop Piedmont plate Pocahontas portion principal produced Pulaski pyrite pyrrhotite quarry quartz quartzite Railway region reported Richmond rock Saltville sand sandstone sandy schist seam shaft shales Shenandoah showing Silica slate slope soapstone southeast stone strata sulphide Sulphur surface Tazewell thickness tons U. S. Geological Survey Valley vein vicinity Virginia Iron western Wythe county zinc
Popular passages
Page 168 - When such a mass of rock is exposed to the weather, minute cracks are formed in it, due to the rock expanding when heated by the sun and contracting when cooled at night, or they may be joint planes formed by the contraction of the rock as it cooled from a molten condition.
Page 118 - ... still higher formations. But a single area can be mentioned in which the cement rocks are exposed within a reasonable distance of a railroad. Several miles north of Stokesville, the terminus of the Chesapeake and Western Railroad, and a few miles south- of Little North Mountain, good outcrops of the rock are encountered. The quantity and quality of these limestones are such that, with the railroad facilities so near at hand, the rock will undoubtedly prove of economic importance. Shales are at...
Page 1 - fall-line," near the head of navigation and the source of water-power, has been an important factor in determining the location of many of the towns and cities of the Atlantic coast. In Virginia, the "fall-line'' passes near to or through the following important cities or towns : Washington, DC, Fredericksburg, Richmond, Petersburg, and Emporia.
Page 179 - IT years ago the company tried making soft-mud machine brick but gave it up for some unknown reason. The clay is obtained from under the surface at several points in the vicinity of the yard and averages from 15 to 18 feet in thickness with an underbedding of sand. The material is quite similar in character to that at Manchester, but lacks the stones and boulders. Maynard and Powers' pit is southeast of the Baltimore Brick Company's excavation.
Page 160 - The material used in the manufacture of natural cement is invariably a clayey limestone, carrying from 13 to 35 per cent, of clayey material, of which 10 to 22 per cent, or so is silica, while alumina and iron oxide together may vary from 4 to 16 per cent.
Page 554 - Here are stationed 18 small amalgamation bowls of cast iron, 30 inches in diameter. The bowls are supplied with runners which move horizontally; in the center of these runners is an eye or opening like that in the runner of a cornmill.
Page 324 - ... approximately 14 tons. It should be made of stout, well-seasoned wood, preferably cypress, should be well braced on the outside, and lined on the inside with heavy sheet lead. Connections should be provided so that either steam or water may be supplied through the perforations in the lead pipes. These perforations are best located at an angle of 45° off the vertical rather than directly on top, in order to prevent clogging of the pipes with fines.
Page 42 - Under the microscope it shows a matrix of minute alternating beds, chiefly of fine Muscovite, with coarser ones, chiefly of quartz, the former with a brilliant aggregate polarization, the latter with a faint one. These beds are parallel to the cleavage. The quartz fragments measure up to 0.085 millimeter.
Page 166 - Report of the progress of the Geological Survey of the State of Virginia for the year 1840.
Page 336 - ... penetrate the pyroxene syenite in dike-like forms and are accordingly younger in age. The mica-gabbro is the ore-bearing rock. In some parts of the gabbro, the sulphides are sparingly present, in others they make up 50 per cent. and more of the total rock mass, with all gradations between. COAL The first coal mined in the United States was in the Richmond basin, where mines were opened and worked on the James river, near Richmond, as early as 1750. For the next 71 years, or from 1750 to 1822,...