Arizona silver belt., 1899-10-12

kIdhltcS VT luc tIdIiItN pCdh iahSN' South Dakota.
 Spokane, Wash, wants to build a smelter, and very wisely debates its site. whether to erect it where the prevailing winds will blow the fumes through the town. or build outside and with view to subsequent smi- tary requirements.
 An original locator' can locate as many more claims as he wants to, and and by doing the required amount Of assessment work, can hold them. \ woman or minor can locate. and by complying with the legal require ments, can hold a mining claim.
 Scheelite, containing 56 per cent of tungstic acid, has been worked at Macracs, Otago, New Zealand. It is found associated with the orc-an auriferous lode and is obtained by crushing the quartz, the scheelite being recovered by concentration. Where several holes, heavily charged with nitro powder, are to be fired in a shaft, in which it has been necessary to carry the timbers near to the bot tom, it is not advisable to discharge them simultaneously by means of the electric spark, as great damage to the timber may thus result.
 Cheap" assaying is like cheap advertising. In both eases il is not what you pay, but what you get for what you pay that determines the value. ''ChcapnesS" is only q relative l term, and cheap work is very often the costlicst kind to those who pay for it..
 Soft ground may be blasted with black powder to better advantage than with nitro powder. Hard ground re- quircs high-grade No. Il powder: medium ground, No. ?. When break ing short ground deep holes are not advisa ble, except where the previous blasts have left particularly favor able condition. Nitro powder freezes at about 42' F. There is great danger in thawing powder when once frozen. It should be handled as little as possible. It may be safely thawcd by placing in tn can or bucket, surrounded by warm water. which is very gradually heated. Nitro powder must not be subjected to sudden change of temperature.
 Near Stockton Hill. Arizona. is found a vein carrying complex ore, in which iron, lead, zine and copper sulphideS are prominent. with usually good values in silver and low values in gold. Crossing this vein at d right angle is another vein composed almost wholly of quartz. hut carryin" q small amount of iron and copper Sulphides and rich in gold.
 Where there is a soft streak in q ! vein or where the vein itself is soft, it is usually good practice to pick out the sofl material before blasting, as better headway may bc made by so doing. It is not advisable lp attempt to pick out the soft material further than can be conveniently done. as the loss of time would soon uyerbalancc any gain otherwise obtained
 
 ! Where the low grade of the ore does not permit an extensive sSstem of tim bering and filling. the vein is worked in series of large-SiZed rooms Ol stopes, timbercd sufficiently t0 kccp up the ground temporarily. and the pillars removed later. the ground being iall0wed to cave. This system is em; ployed extensively in the Lake Su. perior region. and the mines are worked very chcaply.
 II Where q shaft passes through the loose, soft earth OF decOmpOSed rock near the surface. which when dry stands well enough. close tagging should bc done. for ground of this character when. wet. often runs badly and may later cause much trouble AS depth is attained and the ground l becomes more firm the tagging maybe spaced. and still deeper, where il ir hard, Tagging may often b@ dispensed with.
 NOlybdcnitc and mUlybdate of lead are not the same mineral. The former is soft, metallic, scaly, foliatcd min, cral of glossy lead color. and is the Sul phidc of molybdenum. NOlybdatc Oi lead is q soft, brittle mineral. of light yellow to red color, having no metallic lustcr. II sometimes occurs witt other lead ores and is not desirable mineral in any large quantity. either in the mill or shelter.
 \ saw cut may bc made at the cen ter of the inner side of wall-plate, used in shafts. for the purpose of lin ing up the sets. but it is unsafe to de pend upon this center cut alone, fOl while ihc center lines may coincide exactly the ends may swing either il or out of true line and the result i, q very bad job. The only safe way i! to hang plub line at each corner