Arizona weekly enterprise., 1882-06-24
Denver Mining Exhibition.

Arrangements have been made for hold l ing at Denver, Colorado, in the month of | August, 1882, the first exhibition ever | organized in America principally for min ing machinery, ores, products of mills, 1 smelting works and other establishments 1 connected with the mining industry. The 1 plan of the exhibition has been received 1 with great favor, and it is already certain | that the most important and valuable col 1 lection of ores, machinery and reduction products ever gathered in the United States will be exhibited at Denver. l Large numbers of men interested in=4 mines, investors, managers, miners, mill men, scientific men and others connected with the development of the great min ing industry will be present. The American Institute of Mining Engineers, which numbers among its members more than one thousand of the leading mining men in America, will hold during the exhibition it's first meeting west of the Mississippi river. In every respect this exhibition and the gathering of promi nent men to which it will give rise will be important to Western mining inter ests, which will receive the principal attention both iii the exhibition and in the meeting of the engineers. Arizona cinnot afford to pass this favorable oppor tunity without energetic action. Much as our remarkable mining resources de- serve attention and development, they will not receive 1t unless We bring them to the knowledge of the world at proper times and places. The Denver Exposi- tion IS the best time and place which has been afforded us since the beginning of mining in Arizona. For the purpose Of producing concerted action on the part of Arizona mining men, his Excellency, Governor Tritle, has issued an address to the people, in which he calls upon the residents of each mining district to choose representative before the 16th day of June, and he has also appointed me Commissioner for the whole Terri tory Under this commission I hereby notify all District Commissioners that collections of ores and other exhibits should be sent properly packed and charges prepaid to one of the following points: Yuma, Maricopa, Tucson, Ben son, Wilcox, Bowie, in time to be at the railroad station before July 18th. As to the kind of exhibits desired this is neces- sarily governed by the character of mining resources ill the Territory. Ari- zona has already become remarkable for its free milling silver ores and oxidized copper ores, and both of these should receive the utmost attention, as they are the subject of inquiry amongst mining men and investors. The Territory also contains extensive indications of lead, gold ores and coal, which should be prop 1 erly placed before the world.
 In general the exhibits will naturally fall into broad classes like the following:
 Free milling silver ores.
 H-Base silver ores.
 III-Oxidized copper ores.
 1V-Sulphureted copper ores.
 Y-Lead ores.
 VI-Lead ores with gold and silver
 VII-Free gold ores
 VIII -Sulphureted gold ores.
 IK-In connection with the above, iron ores and limestones suitable for fluxes, and coal.
 X-Products of mills and reduction works
 XI-Plans and models of mines, mills and chemical factories.
 XII-Clear and detailed descriptions of the methods adopted for treating the ores, with plans of machinery.
 XIiI-Each district should send one suit of specimens of country rock, show ing the limestone, shale, quartzite ol granite, and especially any eruptive rocks that occur in the district.
 XIV-Statistics of ore mined, ore treated and bullion produced since the beginning of mining operations, and especially for the year which has elapsed since the collection of the census statis ties up to June 1, 1882. In addition, the wood, water and agricultural resources oi each district should be given; or failing the existence of these, the usual source of supply should be stated.
 In regard to the twelfth and thirteenth classes of exhibits, wish to say that this exhibition can be made of great perma nent value to the mining profession if tho managers of mills and other reduction works will give to the Commissioner l; short account of the methods used in re ducing their ores. In mills, the weigh of stamps, number of drops, size O screens, single or double discharge, weigh
 of pan charge, length of pan run, use O
 chemicals both as to quantity and mod,
 of adding them, mode of handling quick
 silver, amalgam and bullion. and thu
 quantity of each, proportions of settling
 tanks, all questions that affect losses whether in shines or tailings, are some o the points desired. In smelting work the style of furnace, character of ore fluxes and fuels, the losses in slag an, fue dust, the management of sulphure ores, and everything that relates to ob
 taining merchantable product in on operation, are in place. It is to be re .: membered also that the attention c thinking men will be aroused most cer : tainly by descriptions of experiments :, novel arrangements and the frank state ment of difficulties, whether overcome 0 ) not. A careful selection of specimen : showing the country rocks connected wit the ores will have great interest for expe , rienced mining men. Especially import 9 ant are the eruptive rocks which usual occur in dykes and are abundant in Ar [ zona. The exhibition will be attende l. by scientific men who are interested !, such collections, and who will freely giv 0 their aid in making the ore deposits ( e Arizona understood and appreciated r Specimens of ore should be accompanie t by an assay giving the amount of golC : silver, copper and lead It is intended |
 collect all such facts into suitable publ
 cation. To increase the value of tn
 work it is requested that short stat
 ment should be sent from each distri