Williams news., 1906-12-08

Cochise county, only six miles from the Mexican border; Jerome, Yava- pal county, in the northwestern part of the state; Clifton, including Morenci, in Graham county, north of Bisbee and close to the New Mexican border; Globe, Pinal county; not far from the center of the territory. In addition 10 these four principal dis ricts, all of which are considerable producers, in about the order given, there are a dozen or more smaller districts. such as the Helvetia, in Pima county; the Wickenburg, and others
 The Bisbee district, of which the town of that name is the center, i> really part, geographically, of the great Sonoran copper belt of Mex ico. The ore deposits occur in car boniferous limestones, bedded in nearly horizontal planes, and un- derlaid by quartzite. The veins are notable for the quantity of huccan along the walls, and are easily mined as rule. The clay carries considerable finery com
 minuted native copper and masses of native metal of respectable size are occasionally encountered. The oxidized zone extends to a depth of of perhaps 400 feet and is succeed ed by una altered iron-copper .sul phides that average excellent values. The oxidized zone is notabl for the richness and extent of it's high grade carbonate ores.
 The country rock of the Jerome district is slate, extensive intruded by dioritic igneous rocks, states and diorites having capping of uncomformable limestones of later age ana devoid of copper. There is limited zone of -oxidized ores, but the principal dependence is placed upon the unaitered dissem mated sulphides These are by no means remarkable for their high percentages of copper, but are notable for their great extent and the high values carried in gold and silver.
 The Clifton district has quartzite and limestones superimposed on granite, with intrusive igneous rocks of both basic and acid types, the entire formation being greatly faulted. Ore occurs in both the eruptive rocks and the limestones It was in this district that the first Arizona copper mining was done, three decades ago There were very extensive deposits of rich oxidized ores near the surface, along the contacts between the porphyry and magnetism limestone. These ores were self-fuxing and highly profit able but gave out at shallow depth, and, contrary to the usual rule, were not succeeded by sulphides. Extensive openings, on the porphy ry of Humboldt Mountain, have developed enormous beds of of low grade sulphides, during the past ten yeafs, and these are TOW the ainstay of the district, though some carbonate ores are still mined. The teaching process, little used in the United States, is employed to advantage in the treatment of certain of the low grade ores of this district.
 The first mining in the Globe district was done in 1876, and was for silver. The Old Dominion, the principal producer a9d typical mine of this field, is opened on vein between a diorite foot and a hanging of arboniferous limestone, over the greater part of which there is a Arachyte capping The principal ore bodies are in the limestone, and the ores are mostly oxidized. A peculiar feature is the presence of a sulphide zone which has oxidized ores both above and below. The ores are highly sili