Bisbee daily review., 1903-04-25
SHANNON COPPER CO.

PrOmlnent among lnS many excei- lent copper properties of Graham
 County are those owned by the Shan
 non Copper Comapny and located near
 the town of Metcalf. four miles from
 Clifton. on Chase Creek. The Shan
 non Company was organized three or
 four years ago for the purpose of Dur-
 chasing the Hughes & Shannon copper
 mine which had for many years been
 considered as the equal of any copper
 mine in Arizona. It had been owned
 by Hon. Chas. M. Shannon, the well
 known pioneer of the district. for
 twenty years. MT. Shannon was not
 able to interest capital to develop the
 property so as to bring 1t to produc- ing stage until he attracted the atten-
 ton of Mir. W. B. Thompson. of the
 Thompson Investment Company. Of
 Boston. and MT. Thompson would not
 undertake to handle the property un- less Mir Shannon would agree to sell
 the property outright, which was final
 ly agreed to with the understanding that
 Mir. shannon would be allowed to re
 tain an interest In the company as a stockholder. The new company irn-
 mediately began the systematic de-
 velpoment of the property. which has
 continued steadily ever since. Besides
 the Shannon mine. the company sue ceeded afterwards in purchasing some
 adjoining claims to it from the Ari-
 zona Copper Company, the pioneer
 company of the district. This gave
 them not only some very valuable
 mines. but also control of ground
 which was necessary in the extensive
 work which had been mapped out for the Shannon mine.
 After several months of develop
 ment work. the Shannon Company be
 gan the erection of a reduction works (. securing a magnificent location on the
 Frisco river. just below Clifton. pict- ure of which accompanies this article
 About a year ago one of the most mod
 ern smelting plants to be found in the
 west was completed. having a capacity
 of six hundred tons per day of twenty
 four hours. The smelter was blown i'm mediately after its completion and was
 found to be perfect in its operation
 but 1t was soon discovered that the ore from the shannon mine, like all the ore in the Clifton Morenci district. required concentration in its most economical treatment. For the purpose of erecting a concentrating plant smelting was discontinued during the six or eight months required for the erection of the mill which was com pleted and successfully put in opera ton about the first of April, this year.
 The new concentrating mill occupies Q position on the hillside. just above the smelter. The mill was designed by William Corkeek, an experienced millman and engineer of Butte, Mon- tana. and was erected and equipped under his directions. The structure is of sufficient size for 600-ton mill. but equipment for only half this capac- ity is in at present. The upper sec ton. for the trommels, rolls and jigs. is 95x64 feet; the lower section for the yanners and tables is 5Ix144 feet. The engineroom Is 32x60 feet in size and contains a 330 horse power Nordberg tandem compounded engine, driven by two 250 horse power Sterling boilers. The water for the boilers and mill work is forced from wells near the T1yer by an electrically operated trl- plex pump of 600 gallons capacity per
 minute. The 55x15 Blake crusher is operated at the ore bins. It reduces the ore to egg size and finer. From the crusher the material is carried by a Robins belt conveyer to the foot Of an elevator at the head of the mill It Is thence delivered to trommels of four sizes. viz; 6-S. 5-16. 3-16 and 1-5 inch. The oversize from the first size trommel passes to set of 16x36 rolls: the oversize from the other three goes 10 figs of various sizes. The undersizes from the first three trommeels each go to a set of jigs suited to its size. The finest trommel undersize goes to hydraulic classifier, which is divided into four compartments by which four sizes are made that pass to the finer jigs. All the jig taiiings, from 5-16- | inch down are reground in the Hunt ! ington mills, whose screens are 1-25 xk inch size The Huntington prod 1 ucr passes to twelve tables. There | are six other tahles which handle the | overflow material from the calssifers. The tables which handle the coarsest from the calssifers have a corrugated l surface, the others being straight ! faced belts The final overflow wate: l is settled and clarified In tank 60x1c | feet in size. with fifteen divisions. The settings here are drawn off at the bot | tom and the clearer water is pipej 1 back to the head of the mill again.
 The ores to be handled comprise | copper and iron pyrites and copper | glance. II Is expected to concentrate !, about five tons into one ton. The jigs l products will be in six sizes. The 1 other product will be from the tables. These jig and table concentrates are mixed oc the shelter charge floor i with copper oxides and carbonates | which come direct from the mine. The tables in the mill consist of eighteen Frue vanners and two Standard tables |