OCR Text |
Show M . ui interest To Miners. m (Mining and Sclentinc Press.) : j When driving a drift, It should be L ut the full sko it is Intended to have- it. dei )1 Thcio is no economy In drifting a United ' ' small drift and subsequently charging "" H it. The same applies to shafts and all in tins I , other mine cuttings, excepting stopes, Vnm, H which should bo worked in blocks, yKf h , .' Where rock Is brokuu in an open cut e"ryri I j cither oro or waste for filling, if tho aland jj , rock is to bo sent down thru a mill suf'oJ p 4 hole located at tho lowest portion of tho cogp,sd' I cut, a grizzly of heavy timbers should pomta I . l be placed over tho shaft to keep largo ul?e ! rocks from passing down and jaiumiug (andti A J f the chilte below, Keceft ', In tho caso of tresspass and removal The ' of bro by another person than the owner, Jmowi I the United Slates Supremo Court said., "f 'jj1; I in case of Wooden ware Cr. vs. the due an I United States, "that an innbeont or un- Cedr' B intentional trespasser may deduct tho , I; cost of mining and raising to the sur- LM B face; but If the invasion is willful, no B , such deduction can be made. Whcro ft M B t ofo. has been mlued and raised to tho Xfl ', surface, and a demand is made for It " I' and refused, -tho owner may recover QAM the value in tho condition it was ut the "" v, ' time demand was made." Selenlto resembles mica when in thin transparent sheets. It Is sulphate of calcium (gypsum). To determine be. Northt . tweeii mica and selenlte, place a piece frf ' v of tliVmlnerulover a fire, and If it bo oho J - selenlte It will quickly become white ifisa" J and opaquo. Mica is little or not at all gjifi ;; nlTectcd by heat. Thcro are also mln- 7:'ss wgi erals containing selenium referred to as "xra'l'i Pp' "selenites,"- but these are ores contain- cctl" K ing U8uulli-copper, silver and lead as V well as bclenlum, and arc not to bo mis- ' B - taken for cither gypsum or mica. BB B r taken for cither gypsum or mica. 1 ''Lead poisoning" in lead mines is BBl due to the minors Inhaling the dust In BBJ the mine workings, caused by drilling, BBJ shoveling, etc. Cases or this kind occur BBj in dry lead mines, where the ores are BBl j oxidized carbonates, sulphates, oxides, BBJ ' etc., audit is seldom heard of in mines BBJ producing galena, unless the men BBJ drink the water in tho mine, which may BBJ contain various mineral salts detrimen- BH tal to health, though the water may bo BH cold and perfectly clear and pleasant BH i!1? tnste. Arsenic is often present H TherPare several kindsWmlca Tho micas arc scaly minerals, of which muscovito (tho ordinary colorless transparent trans-parent mica of commerce) and blollto (black mica of granite and other roclcf.) aro tho most characteristic types. In addition ad-dition to these there are fwrniconita (sodium mica), lepidollto (lithium mica) .intvaldits (Utlilum-hoii mien), plilopo-phlte plilopo-phlte (iiiatrncsiutu mien), liptdomelanc, (iron mica), roscoelltc, (vanadium mica), alurRitc, (mangaeeo uiica), fcerclte (a fine scaly mica of slllty luster), mnrlpos ito (magnesium mica colored by hrom ium oxldp), uranium mlea, and a .aum-bcr .aum-bcr of othei's'Wblcli arc raT: 'kWfai |