Bisbee daily review., 1904-04-29
Prof. Douglas Inter-
 esting Address
Continued from Page Three.)

development of mines on large scale ! can therefore appreciate the impossi- nility of avoiding them altogether.
 The few remarkable instances out Of many which 1 have quoted, of waste on a national scale. it may not be within the power of many or any of us to remedy. But we shall all have 10 consider again and again what pro vision can be made to preserve valua- ble material for future treatment, which, at the moment, is virtually waste.
 Treating Lower Grade Ores.
 Tt is difficult to forecast the future and to anticipate the economical changes which time win bring with it, but of this We may be certain, that the drift of events win be inevitably toward lower treatment charges and therefore the utilization, not only of lower grade ores, but what is today actually rejected as waste.
 Tn mining therefore, 1t is better 10 store at surface, if the character of the ore will permit of it, lower grade ores than to bury them in the stopes as filling, under the certainty that the day is not distant when they will be valuable; or if they must be left un- oerground separate the ore. no matter how low. from actual waste. It may cost tri1e more at first to do so, but in the end it will pay, and the end must always be kept in view.
 ''I have to do with a mine which, when first worked, was 125 miles from -A AL ore fed to the furnace was fixed by the management at IS per cent of copper WSth lower freight and cheaper fuel. the standard was reduced to 12 per cent. Now it is between six and seven per cent.
 Gradaton of Wastes.
 During the first stage, F per cent was waste; during the second, seven per cent was waste. Today i; would be rash to count any copper bearing ma terial as actual waste But a. each stage of development tho ore rejec.ed Tor the moment was treL.el as worth less and thrown as such into the stopes. From there it can be recover ed though at needless cost
 As, however, the property has thrice changed hands since the eafi- days, the original owners would deride i the suggestion that for the good of their successors they should have incurred dollar of unnecessary expense. iu very truth, however, the property would not so often have changed hands had the future and not the immediate present been more prominent in the calculations of each successive admin istration
 The ores of the Arizona mines have changed, and so have the method of treatment. For years it was consider ed that with the appearance of sul- phur would date their rapid decline. Then that pernicious element was re- garded as worse than waste Today it Is in urgent demand, for, with the in- Production of the pneumatic method and the cleaner slags made by matte smelling, it is found cheaper to make copper from sulphide mixture, though by several operations, than from carbonate ores by a single fur mace treatment
 Moreover, We are everywhere re- sme}ting the rich slags formerly made, though, unfortunately, at certain fur naces they were considered as of such little prospective value as to have been granulated and run into the river or go dumped that they have been wash ed away.
 We were not to blame for making copper direct from carbonate ores, though it involves waste, for sulphur cited ores were not obtainable and it would not have paidsto reduce a sul- phide charge by the older methods in vogue 20 years ago. But We were at times to blame for not believing that metallurgy and railroading and all as- i sociated industries would rapidly ad i vance and put cheaper methods, cheap l CT fuel, cheaper transportation within i our reach, and thus change what was then waste into valuable material.
 Waste of Precious Metals.
 The same has been eminently true | of the waste from gold, silver and cop 1 per concentrating mills. Only some l 60 per cent of the hundreds of millions 1 which the Comstock lode yielded was recovered at the time. and yet at first 1 those enormously rich tailing were | not even collected. Such was the l haste of the miner to empty that stu pendous deposit which should have made Nevada prosperous for genera tioDs. instead of whirling the whole country into a mad dance of reckless speculation
 And at Anaconda there are said to be taiEngs by the millions of tons which will run from two to two and a half per cent of copper. made when a arge production rather than minute economies was the order of the day.
 The values locked up in our Ari- zona slags. in the Comstock shines, in he Anaconda tailings. all represent a arge waste and heavy loss, even hough they may be in part recovered y subsequent treatment"