Bisbee daily review., 1910-12-18

has good mixture for its porphy- retic crS.s from the Cumberland Ely mine containing needed iron, limel and other desirable elements. It is a mixture readily treated, and therel is great tonnage daily put through this point The ores run low in cop Ter and it is only by handling an immense amount of them that profits are to be gained Of course immense tonnages mean big holes in the orel deposits.
 The investment at this porphyre- tic property runs high into the mil ]
 ions and there should be a much bet. ter return for the expenditure than Is now possible with the ruling price for copper.
 As Nevada Consolidated work ] westward fs has more stripping to do. the burden being heavier, which adds to the cost. It has spots, too | where the ore runs we'll, this assist ing in keeping up the average which is sometimes lowered because Cf numerous lean tongues of ground 1 These richer epots are probably found in all the porphyry deposits in this and other fields.
 Miami. in the Globe district of Arizona is just cor,mencing the mak
 ing of copper after a preparatory work covering a period of severa
 years, and following the expenditure of many millions of dollar5. At this property the mining will be done UT derground, following the caving or
 wrecking plan where is can be en'
 ployed, or the milling system where it can he used to advantage. Mi.
 Charming is well versed in the best
 systems of ore extraction, having had experience in the Lake Superior and Southern fields in both copISq and iron ores and he will do his
 mining as cheaply as conditions will
 permit. He cannot hope to equal tho low cost of Nevada Consolidated
 due to the physical differences III Jne
 properties. Miami has very elabor- ate plan, for the concentration of it's ores. Its concentrates will go to Greene Cananea smelterfs for treat l ment. The company deserves srest success for its very liberal prepara- tory work here. It was not task for any number of poor men. and is only
 another instance in which combined capital was needed for the develop ment of conditions that otherwise would never have to be treated by
 Miami to make the property pay ex,
 penses and earn dividends.
 Ray Consolidated is another of the porphyretic properties that Is getting
 ready for copper making on a iarge
 scale. It has invested about ten mil
 lion. This gives one an idea of the great expenditures necessary for op
 er.atine the Iow-grade ore deposits
 II takes time and a vast mount ct money 10 get them into condition or copper making. The cOnceu,r-- tors ar. very expensive structure and take a long time in building B.g copped mines are not prepared lor busincss without an abundance | of money. We see illustrations of
 ,his in operating the little ones
 nany places in our Michigan field ! Just what the new porphyry copper l ores will yield in the way of profit has yet to be established in actual l practice. Laboratory tests and mill tests are altogether different proposi lions. It isn't the easiest thing to get
 at a flair percentage of ore fathom
 of ground by the usual assay meth | ods. Wher it come5 to opsration Of l the big plant all the ores haze to go | through and if is well known that the
 a say value and the smelter value
 of ores are often at great variance | the smelter tests running lower. This is true of all kinds of mines, copper, non and the precious mcta-s.
 | Among the newcomers in the Sixty second Congress who wn. doubtless l attract attention by erason of the