Was andere dazu sagen - Rezension schreiben
Es wurden keine Rezensionen gefunden.
Andere Ausgaben - Alle anzeigen
amalgamation Appalachian assays auriferous beryl Burke County Carolina belt carried cent cerium chalcopyrite Charlotte Cherokee county Chestatee chlorite Clay county color concentrates copper corundum Corundum Hill country-rock creek crystalline crystals cyanide Dahlonega Dahlonega method deposits depth developed diabase discovery district dunite emerald enstatite feet deep feet in thickness feldspar Franklin free gold furnace galena garnet gems Geological Survey gneiss Gold Hill Gold Mining granite gravel Haile hydraulic inches Jour Kryst lenticular localities Macon County masses material mica miles northeast miles west minerals mining and milling monazite North Carolina nuggets occur olivine operations ore-bodies outcrop oxide pegmatite peridotite plant plates pounds pyrite quartz quartz-stringers quartz-veins region reported river roasted rock rockers sand saprolites schistose schists serpentine shaft Silver situated slates sluice South Mountain Southern specimens stamp-mill stamps stopes strike sulphurets tailings turnerite vein washing width Zeitschr
Seite 140 - The full charge consists of 120 gallons of water (to make an easily flowing pulp), from 8 to 11 pounds of bleaching powder, then the ore, and finally 12 to 15 pounds of sulphuric acid. The barrel is hermetically closed and revolves for about 3 hours at the rate of 15 to 18 revolutions per minute. (A 5 horse-power engine performs this work and also the elevating of the ore.) The barrel is then inverted, opened and discharged through a lead-lined semicircle in the floor to a filter on the floor below....
Seite 47 - Concord on the west, and a corner of Rowan and of Randolph. In almost any part of this region, gold may be found, in greater or less abundance, at or near the surface of the ground. Its true bed, however, is a thin stratum of gravel enclosed in a dense mud, usually of a pale blue, but sometimes of a yellow colour.
Seite 52 - On the nortwest side of the Uharie mountains is a series of gravel mines situated in a line between the mountains and the Uharie river. Among others may be mentioned the Bright, Ophir * (Davis), Spanish Oak Gap, Dry Hollow, Island Creek, Deep Flat, Pear Tree Hill, Toms Creek, Bunnell Mountain, Dutchmans Creek, and the Worth. The available portions of these placers have been exhausted so far as the present supply of water will answer. The Beaver Dam placer is located about 5 miles west of Eldorado.
Seite 47 - ... exposed to be washed by rains, this stratum frequently appears at the surface ; and in low grounds, where the alluvial earth has been accumulated by the same agent, it is found to the depth of eight feet : where no cause operates to alter its original depth, it lies about three feet below the surface- Rocky river and its small tributaries which cut through this stratum, have hitherto proved the most fruitful localities of the precious metal.