Show REDUCTION PLANTS FOR COPPER MINES in his report to the stockholders of his company joseph B cotton president of the consolidated Copp ermines company operating at kimberly nevada advocates the construction of concentrating and smelting smelling sm elting plants for the treatment of company ores giving in detail his reasons why such a course would be advantageous to the company in summing up the advantages accruing by the treatment of the mine products on the ground mr cotton says on the basis thus set forth it is recommended that new concentrator having a capacity of 2000 tons of porphyry ore and tons of sulphide ore be constructed in connection with the concentrator there is to be constructed a power plant capable of generating K W which will furnish sufficient power for water supply operating concentrator smelting smelling sm elting and mining plants and a smelting smelling sm elting plant capable of smelting smelling sm elting the concentrates resulting from the above ore as well as about tons of oxidized ore per day the concentrator is to be constructed nominally in two sections but is to be arranged and provided with spare grinding mills and flotation machines that a breakdown of one of these will not affect operations allowance is to be made for future possible extension to tons treatment per day the crushing plant is to be built for tons per eight hours the power plant is to contain 2 K W turbo gen aerator sets for 2200 volts 60 cycle 3 phase boller boiler capacity is to be provided for the entire K W but about K W will probably be obtained from the waste heat boilers in the plant the boilers are to be equipped with automatic stokers smokers or possibly for pulverized coal the smelting smelling sm elting plant will consist of a drying department containing four 20 ft 7 hearth anaconda wedge roasting furnaces 9 2 smelting smelling sm elting department containing one ft by 20 ft coal dust fired reverb furnace equipped with stirling waste heat boilers and a converting department containing two 12 ft diameter great falls type converters and stands 1 I am inclined to recommend the immediate construction of a second furnace although it is not absolutely needed or it if it ft is not considered desirable to construct the furnace at once the smelter building should at any rate be made sufficiently long to accommodate the second furnace when it is built this will add approximately to the estimate and is being allowed for the second furnace would cost about more and is not being allowed for the plant will have a capacity of tons of total solid charge per day and about fifty tons per day of molten converter slag of this charge tons will be porphyry concentrates assuming that the concentrator be enlarged to tons daily capacity tons more or a total of tons of this kind of concentrate will result this would permit of smelting smelling sm elting about tons more oxidized ore or a total of tons of material requiring say sixty five tons or more of flux and producing twenty five tons more of three hundred and ninety tons per day is therefore the total probable future requirement qui rement of f the smelter and one additional furnace one more converter stand and two more drying furnaces will easily take care of this increase the plant is laid out with this possible extension in mind 1 I estimate that there will be a saving of practically twenty eight cents per ton of ore in favor of establishing the concentrator and smelting smelling sm elting plant at kimberly instead of at ely and pumping the water necessary for the concentrator in spite of the fact that the water must be pumped a total height of feet or against a total head including friction of 1200 ft lbs ibs per sq in and a distance of 13 miles this saving requires no qualification as the cost of coal for smelting smelling sm elting and power purposes as well as supplies would be exactly the same at kimberly as at ely the same rate being charged to both plants this would presumably also apply to shipments of copper fluxes could be delivered somewhat cheaper at kimberly than at ely it is obvious therefore that the reduction works should be located at kimberly since a saving of 28 cents per ton represents approximately 12 cents per pound of copper recovered from porphyry ore or about per year on a 2000 ton per day or per year on a ton pel day porphyry operation |