The Iron Ores of the Iron Springs District, Southern Utah |
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abundant altered limestone altered rock alumina Analysis by R. D. andesite andesite laccoliths apatite average beds biotite breccia British thermal units Bull Valley calcite Canyon carbonate Carboniferous cent chalcedony Claron limestone coal delivered COMPARISON OF COMPOSITION COMPOSITION OF ALTERED conglomerate constituents contact phase Cretaceous crystals Desert Mound determined developed diopside dry coal erosion faulting feet feldspar fissures fragments fresh limestone furnace Geological Survey Granite Mountain GRAPHIC COMPARISON groundmass heating value hematite High Plateaus Homestake limestone hornblende Hurricane fault igneous rocks inches intrusion Iron Mountain Iron Mountain laccolith Iron Springs district iron-ore deposits laccolith latest trachyte lavas layers lime limonite magnesia magnetite mass metamorphism moisture ore-bearing solutions orthoclase percentage phenocrysts Pinto sandstone plagioclase quartz quartzite R. D. Hall rhyolite sample sediments shale silica SiO2 slopes soda Specimen surface temperature Tertiary thickness Three Peaks tion trachyte U. S. Geol Utah veins
Popular passages
Page 101 - BULLETIN 339. The purchase of coal under government and commercial specifications on the basis of its heating value, with analyses of coal delivered under government contracts, by DT Randall. 1908. 27 pp. 5 cents. BULLETIN 343.
Page 9 - Maximum limits for ash," on page 4, may be accepted. Frequent or continued failure to maintain the standard established by the contractor, however, will be considered sufficient cause for cancellation of the contract. PRICE AND PAYMENT.* Payment will be made on the basis of the price named in the proposal for the coal specified therein, corrected for variations in heating value and ash, as shown by analysis, above and below the standard established by contractor in this proposal.
Page 5 - However, if the coal containing the higher volatile matter is properly burned in a suitably designed furnace, it may be made equally efficient. "Sulphur may be present in the free state, or as is more commonly the case, in combination with iron or other elements. Other impurities with sulphur often form a clinker which shuts out the air and increases the labor of handling the furnaces. It is possible, however, to burn coals containing up to 5 per cent. of sulphur without particular difficulty from...
Page 3 - ... burned in a specially constructed furnace under a boiler. Coal is burned under boilers for producing power, for drying various materials, or for warming buildings. The most valuable coal, therefore, is that which gives up the most heat to the boiler for a given weight burned. The value of a coal is indicated by the number of heat units it contains. This heating value is expressed in terms of British thermal units (abbreviated B.
Page 15 - A small quantity of coal will be taken from each weighing hopper just before the hopper is dumped while the lighter is being unloaded. These quantities will be thrown into a receptacle provided for the purpose, and when the lighter is empty the contents of the receptacle will be thoroughly mixed, and a sample of this mixture will be taken for chemical analysis. This average sample of coal will be labeled and held for one week after the unloading of the lighter. The sample taken from the mixture for...
Page 12 - Marvine, AR Report on the geology of route from St. George, Utah, to Gila River, Arizona. Examined in 1871.
Page 25 - The classes numbered 2, 7, and 8 are sold at cost of publication; the others are distributed free. A circular giving complete lists can be had on application. Most of the above publications can be obtained or consulted in the following ways: 1. A limited number are delivered to the Director of the Survey, from whom they can be obtained, free of charge (except classes 2, 7, and 8), on application. 2. A certain number are delivered to Senators and Representatives in Congress for distribution. 3. Other...
Page 11 - ... the standard established by the contractor, but it is necessary that all deliveries shall be within the limits set by the Government. The standard established by the contractor should, however, be such as to require the least possible correction in price on account of variation in heat units and ash. The heating value, expressed in British thermal units, of coal containing approximately the same percentage of ash is essentially a direct measure of the actual value to the purchaser, and for this...
Page 17 - Owner shall be at liberty, after three days written notice to the Contractor , to provide any such labor or materials, and to deduct the cost thereof from any money then due or thereafter to become due to the Contractor under...
Page 23 - SLIPS. [Mount each slip upon a separate card, placing the subject at the top of the second slip. The name of...