Arizona weekly enterprise., 1882-07-08

copper ores, and both of these should receive the utmost attention, as they are the s, | js:; of inquiry amongst mining men a.. 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.
 u-Base silver ores.
 IlI-Oxidized copper ores. IV-Sulphureted copper ores. V-Lead ores.
 VI-Lead ores with gold and silver.
 VII-Free gold ores.
 VIIl-S Sulphureted gold ores.
 N-In connection with the above, iron ores and limestones suitable for fuxss, 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.
 X1II-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, 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 l silver, amalgam and bullion, and the | quantity of each, proportions of settling tanks, all questions that affect losses, whether in shines or tailings, are some of 1 the points desired. In smelting works the style of furnace, character of ore, | fuxes and fuels, the losses in slag and iue 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 l thinking men will Do aroused most cer- | &afp hxv Sf novel arrangements and the frank state ment of difficulties, whether overcome or 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 1 by scientific men who arc interested in such collections, and who will freely give their aid in 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 to collect all such facts into a suitable publi- cation. To increase the value of this work it 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 nt large, and also the especial facts con nected with each mine represented D, the e1hibit. Each district will also supply a case to contain it's exhibit, and such cases when intended tor a table should be two and one-half feet wide, fifteen inches high at the back and eight inches high in front, inside measurement, with a sash cover hinged at the back; length sufficient to contain the specimens sent. Wall cases to contain specimens should be six 1 feet high and eighteen inches deep. If any district omits to appoint a commits sioner, any person desiring to exhibit can send his specimens marked as above, pre- paying charges, and write to ths nearest appointed commissioner, asking him to take charge of his exhibit.
 District Commissioners, when ap- pointed, are requested to communicate with me for the purpose of securing har- monv of action. Communications on the subject of the exposition may be sd- dressed to me or to Thomas R. Sorin, Assistant Commissioner, Tombstone, A. T. DIRECTIONS FOR PACKING.
 1 Select fresh specimens if possible.
 2. Wash them clean, using tooth brush to remove hardened clay.
 3. Do not paste any label on them.
 4. Write separate label for each speci- men, giving name of mine, district, county and owner
 5. If necessary to mark the specimen use red paint and small camers hair brush, and make small figures.
 6. Wrap tho specimen with its label in paper.
 2. Pack in strong box and .till the boz, so as to prevent shaking. Do not use sawdust, but pack in with paper.
 8. Paste the printed address attached to this circular on one end of the box,