Arizona weekly enterprise., 1882-07-01

copper ores, and both of these shou d receive the utmost attention, as they are e subject of inquiry amongst mimi 2 men and investors. The Territory also contains extensive indications of lead, gold ores and coal, which should be prop erly placed before the world.
 In general the exhibits will naturally fall into broad classes like the following:
 I-Free milling silver ores.
 JI-Base silver ores.
 III-Oxidized copper ores.
 IV-Sulphureted copper ores.
 V-Lead ores.
 VI-Lead ores with gold and silver.
 VII-Free gold ores.
 VIII-Sulphureted gold ores.
 IX-In connection with the above, iron ores and linestones suitable for huxes, 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 or 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- tics up to June 1, 1882. In addition, the wood, water and agricultural resources of 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, I wish to say that this exhibition can be made of great perma- nent value to the mining profession if the managers of mills and other reduction works will give to the Commissioner a short account of the methods used in re- ducing their ores. In mills, the weight of stamps, number of drops, size of screens, single or double discharge, weight of pan charge, length of pan run, use of chemicals both as to quantity and mode of adding them, mode of handling quick silver, amalgam and bullion, and the quantity of each, proportions of settling tanks, all qdest.ons that affect losses, whether in shines or tailings, are some of the points desired. In smelling works the style of furnace, character of ore, auxes and fuels, the losses in slag and flue dust, the management of sulphuret ores, and everything that relates to ob- taining merchantable product in one operation, are in place. It is to be re- membered also that the attention of thinking men will be aroused most cer- tainly by descriptions of experiments, novel arrangements and the frank state ment of difficulties, whether overcome ol not. A careful selection of specimens showing the country rocks connected with the ores will have great interest for expe- rienced mining men. Especially import ant are the eruptive rocks which usually occur in dykes and are abundant in Ari. zona. The exhibition will be attended by scientific men who are interested in such collections, and who will freely give their aid ill making the ore deposits of Arizona understood and appreciated. Specimens of ore should be accompanied by an assay giving the amount of gold, silver, copper and lead. It is intended tc collect all such facts into suitable publi- CdJlOu. 10 lHCTesSe Iile value OI UIlls work 1t is requested that short state, ment should be sent from each district giving the position, altitude, surface char acter (whether mountainous or rolling), population and other facts of the district at large, and also the. especial facts con- nected with ettch mine represented in tie erltibit. Each district will also supply a case to contain its exhibit, and such cases when intended tor table should be two and one-half feet wide, fifteen incher high at the back and eight inches high ir front, inside measurement, with a sash cover hinged at the back; length sufficient to contain the specimens sent. Wal cases to contain specimens should be siz feet high and eighteen inches deep. Il any district omits to appoint commis sioner, any person desiring to exhibit caI send his specimens marked as above, pre- paying charges, and write to the neares appointed commissioner, asking him tc take charge of his exhibit.
 District Commissioners, when ap pointed, are requested to communicate with me for the purpose of securing har mony of action. Communications on tn, subject of the exposition may be ad dressed to- me or to Thomas R. Sorin | Assistant Commissioner, Tombstone, A. T l DIRECTIONs FOR PACKIN0