Daily Arizona silver belt., 1908-12-20
MIAMI COPPER COMPANY.

lnROPABLf the most notable sue
 Il cess of the year among the new
 copper mines, is that of the Miami
 Copper company, situated about six
 miles west of Globe. The property
 comprises about 300 acres, practically
 all of which has been proven to be min
 eral in character. In 1906 the General
 Development company Ccontrolled by
 the Lewisohns of New York; obtained
 bonds on the claims at Red Springs
 from J. B. Newman, Philip Oates and
 others, and started development work
 which was carried on continuously un-
 til March, 1908, at which time, accord.
 ing to J. Parke Charming, the engineer
 in charge, 2,00o,0OO tons of per cent sulphide ore had been brought into sight.
 The Miami Copper company was then formed, the organization being com pleted in April, and development con tinued on a larger scale. On July 20, MT. Charming in a report to the direc- tors of the company, stated that 4,400,- 900 tons of ore had been placed in sight, and 2,2o0,OOo tons additional partly in sight.
 In September the amount of ore prae- tically blocked out had increased to more than 6,OOo,ooo tons, and since that time the tonnage indicated in the various openings on the several levels has steadily grown with the progress of development work, until at the present time there have been brought into sight in the Miami mine nearly 14,000,000 tons of ore (principally chalcocite) the average value of which on the differ ent levels runs from 2.75 to 3.l0 per cent copper.
 To quote Mir. Charming: "The geo. logical conditions of the ground show that the ore occurs in an area of highly silicifed Pinal schist at or where it has been cut by the Scbulze granite. This SC hist has been profoundly sheared and scanned, and in this rock the miner al occurs as veinlets and particles of chalcocite or copper sulphide. Some pyrite is also visible on the 470.foot level. The principal development on the property has been at the Red Rock shaft At this point the shaft has been sunk to depth of 720 feet and three levels (now four levels) have been opened up, at 270 feet, 370 feet and 470 feet (and subsequently, at 670 feet) respectively" On the 470-foot level drifts have demonstrated the deposit of merchantable orc to be more than 1900 feet wide, north and south.
 The ore will be treated by concentra- ton. A small experimental mill hay ing Nissen stamp to crush the ore, was erected at the mine and tests have been conducted by the company and at sampling works elsewhere, with sat isfactory results. These tests have shown that the ore can be readily con centrated fifteen into one, and that the final yield of copper (according to MT. Channing) allowing for concentrating, smelting and refining losses, will be 42 pounds of copper to the ton of ore.
 A concentrating mill of 2000 tons capacity has been planned and the con struction of the first unit of 1000 tons capacity will begin just as soon as the extension of the Gila Valley, Globe & Northern railroad is built from Globe to the Miami property. Part of this extension for few miles out of Globe, has been constructed and the final sur vey and some other preliminary work over the remainder of the route is be- ing carried on. It is expected that this piece of railroad will be in opera tion within four or five months. The mill will be erected at the east end of then property, in close proximity to the four-compartment, square working shaft, which is now being sunk, and which will be put down to 1000 feet. It is expected that the first unit of the mill will be complete by January, 1910.
 When it is. ycmembered that only about cne-tentl of the property has been develop'd to the very moderate depth of 670 feet, the further possi- bilities of inc teasing the known ton.