Arizona silver belt., 1899-10-05
CONCENTRATES.
Items of Interest in Regard to Mines
 and Timing.

mlileS make SOou miiieTs'
 Antimony sometimes occurs in me tallie state, but usually as the sulphide of the metal ,stibnitel.
 Zinc ores which contain iron make a poor grade of spelter and is not sale able as a iirst-class product.
 Coppersulphides. when roasted prior to mating, produce higher grade oi matte than if not previously roasted
 Electrical development in connec- ton with mine work is at its present highest advance in Cripple Creek. Col, Because an ore deposit is shallow is not a sign that it is without value Very rich ore is sometimes found in superficial deposits.
 Turn plates made of rolled steel are superior to turntables in mine work ings underground the latter being un- wieldly and requiring many repairs.
 United States copper mines last year furnished 243069 metric tons of cop per 55l per cent of the worlds sup ply. Spain was second with total of 5i,o17 tons.
 If the production of the mines of the Transvaal is not interrupted during the remainder of the year the output will reach about sl00,o00.o00 for the year 1899.
 The highest mine in the United States is probably that near the sum init of the Sierra Blanca, near Garland, Colo. The mine is l4,i00 feet above sea level
 During the past eight years mines owned by J. R. De Lamar, at De La mar, New, have produced S6,323, 900, out of which dividends amounting to g. 3J0, 600 have been paid.
 In ventilation of deep mines is re- commended an exhaust fan in the up- cast shaft. supplemented by electri- cally driven fans underground and the discharge of rock drills
 Any stock in any California corpor- ation is assessable. No bylaws of any corporation incorporated therein can waive the right conferred by the state to assess the stock.
 1t is less expensive ,o send ore out in trains of half a dozen or more ears and haul them back by horse or other power than to send cars out singly each in charge ofa trammer.
 The secretary of the interior last week decided that United States patent may issue covering both a quartz and placer claim, reversing the ruling of United States General Land Commissioner Best.
 At the intersection of the Galena and Jordan lodges at Bingham, Utah, 100000 tons of lead-silver ore were taken out in the early history of the camp. These ores sold for 5000, oO0.
 Pyritic smelting is process of re ducing sulphide ores in blast furnace without carbonaceous fuel, the neces sary heat being supplied by the burn. ing of the sulphur contained in the ore.
 Ores which contain as high as b pei cent sulphur should be roasted before smeIting This is matter of judg, ment on part of the shelter, for ores containing high values in silver lose silver in the roasting process,
 Nearly every city and village in ilunduras, Central America, has been built as the result of mining enter prises in the vicinity which have been carried on there ever since the settle ment of the country.
 The capacity of blast furnace de- bends largely upon lhe quality of fuxes necessary, t he Instability of the ore and the pressure and volume oi the blast. \ large body of fine ma terial lessens the capacity.
 lttCtnt lplt NNotN hN Sitt iRH Nl Np'b ing laboratory at London resulted ir the breaking of a wire rope E inches in diameter by pull of about 25l tons, the full strength of the l0s0 indi. yidual wires being 3j0 tons.
 Some ores and also mates are roasted without salt, the silver combining with the sulphur present in the form of sulphate, which is soluble and is ieached out with water. This the prin cipal feature of the Zievegel process.
 Good ventilation may usually be se cured in shaft by dividing it into two compartments by tight parti tion. When steam is available, powder smoke and other gases may quickly be driven from the bottom of thu shaft by turning in steam.
 A substantial track may De made O 2x4 scantling set on the narrow edg, and faced with strap iron. In some mines track of this description il ssed for empty cars going into thu shutes, T rail being used on q paralle track for loaded cars going out.