Arizona silver belt., 1899-10-12
CONCENTRATES.
Items of Interest in Regard to Mines
 and Timing.

than brittle rock. Muriatc ichloride) of copper is green darker than malachite. There are 5000 shareholders in the Calumet & Hecla Copper Co.,; very few of them hold over 1000 shares.
 It is a difficult matter to see into the ground; it requires muscle, persever- en,,e and the expenditure of money.
 In the last fifty years the state of California has yielded an aggregate value of Sl.Soo, ,0OO,Oo0 in mineral pro ducts.
 Ina placer location of l60 acres by on association but one discovery is sur iicient. Such association must con sist of eight persons.
 Although liquid air is reported to have been successfully used in bast- ing operations, it has not as yet come into extended use nor is it likely to. It. is stated that on a clear day the summit of the mountain Fernando Pc. on the coast of Africa, can be seen at sea from distance of 35o miles.
 The original gold nugget found hy Marshall at Coloma, Cal. January l9, 1S4S. is now in the possession ot W. w. Allen, san Francisco.
 
 A desideratum is blasting powder, safe to handle and equal to the various grades of nitro powder which, upon exploding. shall make no noxious gases.
 The new Talnarack shalt, near HoughtOn, Mich, will be completed in two years more. It has live com partments and connects with levels two miles in length.
 Native tellurium is rare, butts found in Boulder county and other parts of Colorado. II is most commonly gran ular, massive. but sometimes occurs is six-sided prisms.
 At one period of it's history the Rob ert F. Lee mine on Fryer hill, Lead vile. Colo. produced about s1l1,0Oo in seventeen hours. The ore was very rich in chloride Of silver.
 Colorado mine-0wners have now to advertise for working miners, and the usual line in the morning papers, warning miners looking for work. to "keep away, is absent.
 Miners who have been making new locations for Uncle sam arc returning from the extreme east or west, where they have aided in perfcciing title and doing location work.
 Most of the ore deposits of Cripple Greek. Colo, occur in andesitc breccia, but the veins also extend downward into the underlying granite.
 Quicksilver mines, like those oi cop Der, gold and other mctals,cdn be made profitable on a very low percentage of metal if the deposit bc large and other conditions are favorable.
 The ridiculous statement about mo lybdenite are not bc believed. MOlyb- denite is not used on the Pacific coast. Concentrated to a product of high per centagc. il is worth about Sj00 per ton.
 X gasoline engine uses about l2 gal lon of gasoline per brake H. P. hour. Gasoline is rated according to it's spe- cifc gravity. n deg. Baumc gasoline is ordinarily used. 72 deg. and Il deg. being also employed.
 Fluorite. or iiuor spar. treated with sulphuric acid, evolves an acid which will ctch glass. IIydro-huoric acid cannot he kept in glass bottles for this reason. II is put in leaden or rubber bottles.
 The treatment of ore in every mine is at first largely matter of cNpcri- ment. and il would be true economy al the start iO employ q competent man ia give the necessary information connected herewith.
 Machine drills are simple in cor struciiun and are sclf-opcrating with either steam or air. but there are many things concerning machine drills and their operation which cannot ho learned in day. as some suppose.
 In some ores thc gold occurs il, aSSo- citation with other minerals which render anaeama,iun difficult or in- possible. The gold may in some eases be obtained by concentration, where amalgamation or other methods fail.
 To determine the h. D. of water supply. multiply number of gallons flow per minute by pressure in pounds per square inch; divide product by 1j0o To find pressure in pounds per square inch" multiply number of feet fall by 0435.
 \ mine manager recently testified that property which had been under his management for four year never paid more than expenses. On being questioned more closely he said the mine paid no profits, but the divi- linn. lN..tt tS.