Arizona weekly enterprise., 1882-07-29

it's 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 erly placed before the world.
 In general the exhibits will naturally fall into broad classes like the following:
 Free milling silver ores
 II-Base silver ores
 Oxidized copper ores.
 IV-Sulphueted copper ores.
 V-Lead ores.
 VI-Lead ores with gold and silver.
 VII-Free gold ores.
 VIIl-Sulphureted gold ores.
 IX-In connection with the above, iron ores and limestones suitable for fiuxes, and coal.
 X-Products of mills and reduction works.
 XI-Plans and models of mines, mills and chemical factories.
 XII1Clear and detailed descriptions of the methods adopted for treating the ores, with plans of machinery.
 AlIl-EdCR QlSJTlCL SCiiu Oic 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-Statistic 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 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, 1 wish to say that thi: 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 { short account of the methods used Tn re ducinc 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 mode of adding them, mode of handling quick silver. amalgam and bullion, and thu quantity of each, proportions ot settlln! tanks, all questions that affect losses whether ill shines or taillngs, are some o the points desired. In smelting work the style of furnace, character of ore fuxes and fuels, the losses ill slag an'
 fiue dust, the management of sulphure
 ores, and everything that relates to ob
 taining merchantable product Tn on
 operation, are ill place. It IS to be re membered 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 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
 ant are the eruptive rocks which usuall
 occur in dykes and are abundant in Ar . zona. The exhibition will be attende by scientific men who are interested l
 such collections, and who will freely giy
 their aid in making the ore deposits (
 Arizona understood and appreciated Specimens of ore should be accompanie 7 by an assay giving the amount of golC silver, copper and lead. It is intended , collect all such facts into a suitable publ
 cation. To increase the value ot tn [ work it is requested that short stat ment should be sent from each distrl giving the position, altitude, surface cha . acter Whether mountainous or rolling . population and other facts of the distri 2 at large, and also the especial facts col nected with each mine represented in L Q exhibit. Each district will also supply . case to contain its exhibit, and such cas- a when intended tor table should be tv e and one half feet wide, fifteen inch z high at the back and eight inches high n front, inside measurement, with sal i cover hinged at the back; length sutticlel
 to contain the specimens sent. Wa :. cases to contain specimens should be 8 f feet high and eighteen inches deep. e any district omits to appoint commi 7. sioner, any person desiring to exhibit e send his specimens marked as above, pr e paying charges, and write to the nearo ,s appointed commissioner, asking him a take charge of his exhibit. y District Commissioners, when a r. pointed, are requested to communica IT with me for the purpose of securing hf
 monv of action. Communications on t l. subject of the exposition may be a h dressed to me or to Thomas R. Sori D. Assistant Commissioner, Tombstone, A. y DIRECTIONS FOR PACKING.
 Select fresh specimens if possib es 2. Wash them clean, using toe ~ brush to remove hardened clay. of 3. Do not paste any label on them.
 4. Write separate label for each spe lv men, giving name of mine, distri ne county and owner.
 t. 5. If necessary to mark the specim
 use red paint and small cancels h
 brush, and make small figures.
 6. Wrap the specimen with it's la
 in paper.
 z. Pack in strong box and .fu d. boz, so as to prevent shaking. Do l of use sawdust, but pack in with paper. CT 8. Paste the printed address attacF h. to this circular on one end of the b. Is, and also mark the top with ink. Pa it's ages not marked with ink will not be he ceved by the railroad.
 ed All packages should be addressed in follows:
 ,l- x-4 JOHN A. CHURCH, on E Mining Exposition, ed *-* Denver, Colorado