Arizona citizen., 1877-04-07
New Methods of Working Ores.

New Methods Of Working Ores.
 Colorado contains very rebelliou
 gold and silver ores. Perhaps as many
 mining failures have occurred in Colo
 rado for want of the right process o processes, as in any other State or Ter
 ritory. Assays proved the ores rIcf
 but the working processes in use faileC to save the precious metals. Of lat, years, men of the highest scientific at tainments have been experimenting
 with those and other ores with nor, or less success. James Douglas O. Phenixv.lle, Pa, Professor T. Sterry
 Hunt of Boston, Mass, and J. o. Stew art of Georgetown, Colorado, have per fectcd a process for which they have received g United States patent, which seems to have worked wonders in say ing the precious metals in Colorad, and Montana, and in connection with it, Mir. Wm. Purvine is introducing q wooden pan of his own invention which according to report is far supe rinr to any iron pan in use. Of five mills Tn operation at Butte, Montana four use the process and pan just re ferred to. Gold and silver ores con taining iron, copper, led, zIuc and antimony are successfully worked ur 10 90 per cent. of the fire assay, which by any other process never yielded above 60 per cent The process re quires copper. Copper in solution as chloride assists in the extraction ofsil- yer from ores, and this is a leading fea- ture Of the process of Messrs. Douglas, Hunt and Stewart If the ores do nOt contain copper, it must be added, and hence we think our Globe district mn. CTS would do we'll 10 correspond with the gentlemen named, giving the char '-ttA oi tANii OASSt dS w uuAC4o ottsLiN' they all contain some copper. From two to twenty-five per cent. copper in gold and silver ores are best adapted Tine Douglas -HuntStewart process is used in working copper ores in Phe- nixville, Pa, and making money fol the operators out of copper ore which contains but four per cent. metal. In Colorado and Montana, most saIisfaC. tory results are obtained, and we are assured that 90 per cent. of the assay value is being saved from samples Q. ore sent to Us. Mr. Wm. Puryine oi Butte, Montana, who is the inventor Ci the pan now successfully used with the process in Montana and Colorado nearly ten years ago spent several months ID me;allurgical works in San Francisco. ard while there worked con- siderable ore from Arizona, most ali of which contained copper, and thIs lead, him to correspond with Us regarding the character Uf late developments. In a reply 10 him, we stated that we hesi- tated very much t1 Ssk the attention ol miners to new processes, the introduc- ton of which might not meet repre-. senta,ions, either from inherent defects or incspscily of operators. In letter of date March 20, 1877, MT. Purvine says:
 You need not hesitate to give the process d liberal notice in your paper. You will see by reading the pamphlet. that there is no trumpejIng III it. Doug las Is making money at PhenIXviilc. Pa, out of copper ores that avera ge less than four per cent, and Stewart for whom am here (Ge0TgetOWn. Col OraqO,) building twO of my pans, i- extracting 90 per cent. anu upwards oi the gold and silver of such ores as send you. I will try and wriie you in 6 few days and give you working de- tails.
 We have rough sketches of the PUr- vine pan and also of the furnace used in the process. Referring to his sketch of the pan, Mr. Purvine says;
 You will see the sides are concave This allows all heavy matter, includ- ing quicksilver snd amalgam tO rise up the sides with the flowing body Oi the pulp. The sides being curved, causes the charge while being worked to circulate freely and tO sweep tho sides of the pan with force sufficient to prevent any packing as occurs in pans with straight sides and especially where wings are used to divert the flowing pulp from the sides of the pan to the center. The peculiar shape of this pan, diSpenseS entirely with the use ot wings This pan is made of any size required and k all wool, so as to admit of using iron m slabs or sponge, or both, or neither, as the treat ment may require. The pan is espc- cially adapted to the treatment of sil yer ores carrying copper, lead, zinc, antimnny and arsenic. Fully double the work can be done In given time by the same power with these pans that can be in the ordinary pan, and they are more durable than any iron pan.
 Speaking again of ores best adapted to the process and pans, he says:
 Ores of gold and silver, rich in cop r,..l o1-a val. is deficient in the ore, it is quite as well if ores ofcopper are added. and no matter what the condition of the copper, carbonate, oxide or sulphuret A very lsrge percentage of the ores worked in the laboratory. while 1 was in San Francisco. from Arizona, were rich in copper and were such as would work to great advantage by this pro cess
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