Arizona weekly enterprise., 1882-08-05

copper tras, and both If these should receive tue utmost attention, as they are the subject of inquiry amongst mining men anu 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:
 Free milling silver ores.
 IT. Base silver ores.
 III -Oxidized copper ores.
 Sulphureted copper ores.
 N-Lead ores.
 VI-Lead ores with gold and silveN-
 NiI-Free gold ores.
 VIII-Sulphureted gold ores.
 IX-In connection with the above, iron ores and limestones 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-Eack district should send one smt 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, 1 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 oi 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, amalgan and bullion, and the quantity of each, proportions of settling tanks, all questions that affect losses whether in shines or tailings, are some oi the points desired. In smelting works the style of furnace, character of ore fluxes and fuels, the losses in slag anC hue dust, the management of sulphuret ores, and everything that relates to ob taining merchantabie product in on' operation, are i'll place. It IS to be re menbered also that the attention o thinking men will be aroused most cer tainly by descriptions of experiments novel arrangements and the frank state ment of difficulties, whether overcome O not. A careful selection of specimens showing the country rocks connected witl the ores will have great interest for expe rienced mining men. Especially import ant are the eruptive rocks which usuall' occur in dykes aud are abundant in Ari zona. The exhibition will be attended by scientific men who are interested il such collections, and who will freely giv their aid in making the ore deposits o Arizona understood and appreciated Specimens of ore should be accompanies by an assay giving the amount of gold silver, copper and lead. It is intended t collect all such facts into suitable publi | cation. To increase the value of thi work it is requested that short state mont should be sent from each distric l giving the position, altitude, surface char acter (whether mountainous or rolling, population and other facts of the distric at large, and also the especial facts COT nected with edch mine represented ia H erlibit Each district will also supply case to contain its exhibit, and such case when intended tor table should be tw and one-half feet wide, fifteen inche high at the back and eight inches high i front, inside measurement, with sas cover hinged at the back; length sufficier to contain the specimens sent. Wa cases to contain specimens should be si feet high and eighteen inches deep. any district omits to appoint commi sioner, any person desiring to exhibit ca send his specimens marked as above, pr' paying charges, and write to the neare' appointed commissioner, asking hlm take charge of his exhibit.
 District Commissioners, when al pointed, are requested to communicat with me for the purpose of securing ha mony of action. Communications on tf subject of the exposition may be a' dressed to me or to Thomas R. Soril Assistant Commissioner, Tombstone, A. ]
 DIRECTIONS FOR PACKING.
 1 Select fresh specimens if possibl
 9 Wash them clean, using toot brush to remove hardened clay.
 8. Do not paste any label on them.
 4. Write separate label for each spec men, giving name of mine, distric county and owner.
 5. If necessary to mark the specint use red paint and a small camePs Ina brush, and make small figures.
 6. Wrap the specimen with its lab in paper.
 7. Pack in strong box and .fu boT, so as to prevent shaking. Do Il use sawdust, but pack i'll with paper. 8. Paste the printed address attach( to this circular on one end of the bo and also mark the top with ink. Pac ages not marked with ink will not be T ceived by the railroad.
 All packages should be addressed follows:
 4-* JOHN A. CHURCH, E Mining Exposition, *-+ Denver, Colorado.