Annual Report of the State Mineralogist for the Year Ending ..., Količina 4State Office, 1884 |
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alloy Amador County Angeles County antimony asphaltum assay Blake blowpipe boracic acid borax Calaveras County California Cañon carbonate of soda cent chrome clay coal coast color Company containing copper Creek crucible crystals cupel deposits diamond Dorado County El Dorado County employed Etym feet furnace glass gold granite heat Hill inches Inyo County iron known Lake lead lime limestone localities magnesia manufacture marble Mariposa Mariposa County melted mercury metal miles mineral Mineralogist mines Mono County Mountains Museum nearly Nevada County nitric acid obtained occurs operation ounces oxide Pacific petroleum placed Placer County platinum Plumas County portion potash pounds powder precipitate production pure pyrites quantity quartz quicksilver Railroad River rock roscoelite salt San Bernardino County San Francisco sand Sierra silica silver soluble solution specimens stone sulphate sulphide sulphuric acid tellurium tons tube Tuolumne County Valley veins washed weight yellow
Priljubljeni odlomki
Stran 217 - Sir Francis Drake, who, in 1579, visited this coast and entered the bay which now bears his name, on his return to England, gave such a glowing account of the country that Hakluyt, a historian of that day, in writing about it remarks that " there is no part of the earth here to be taken up wherein there is not a reasonable quantity of gold or
Stran 3 - of an Act of the Legislature, entitled "An Act to provide for the establishment and maintenance of a Mining Bureau,
Stran 79 - In the presence of lead and antimony Bismuth can be detected in the following manner: The mixture of the three oxides is added to an equal volume of sulphur and treated in a cavity upon charcoal with RF; the oxides are thus converted into sulphides. The assay is then placed upon a flat coal and treated with the
Stran 79 - ceased ; the residue is placed in a mortar and pulverized and mixed with an equal volume of a mixture of one part of iodide of potassium and five of sulphur; it is then heated in an open glass tube and if Bismuth
Stran 204 - inconvenient. If the bar is brittle, a much larger piece may break off with the chip than is required. If the proper sized chip is cut off successfully, it is likely to fly away and be lost. A better way is to bore into the bar in different parts with a small drill. This
Stran 204 - done in a lathe, or by means of a ratchet drill. The bar should be placed in a clean copper pan ; so that no loss may occur; the surface borings, resulting from the first revolutions of the drill, should be rejected. Those that follow, to the extent of a little more than one
Stran 204 - This number should represent the bar through every stage of the assay by which its value is ascertained. Some assayers stamp the initial of their name on the cut faces, so that no portion can be removed after it leaves their hands. The next step is to ascertain the weight of the bar in troy ounces
Stran 388 - Calaveras County, at Carson Hill, in the large vein, and associated with gold. This ore, in decomposing, leaves a blue stain of carbonate in the quartz, and where it is found the rock is generally rich in gold
Stran 79 - of Iodide of Bismuth will be deposited a short distance above the yellow sublimate of lead ; the sublimate of iodine, which is liable to be deposited higher up the tube, must not be confounded with the Bismuth sublimate.
Stran 167 - the reign of Louis XII. Cardinal Mazarin is said to have been the first who had diamonds cut in that form. The cutting of the brilliant is governed by certain rigid rules, the slightest deviation from which produces an imperfect gem. David Jeffries, who published a treatise on diamonds and pearls in London in 1750, a copy of which may be found in the library of the