Bisbee daily review., 1907-04-28

corps, by which term is meant that
 grades are being established and cuts
 land fills being indicated by stakes for the guidance of the contractor.
 The mouth of the canyon where the Is. P. has elected to begin work is about ten miles from tho point Of com
 mencement. It is perhaps the worst country for railroad construction along the entire survey. Tac contractor es- inmates he viii not be able to get out of 1t under nine months. After the canyon is trayersed the survey opens out into country where railroad con lstruction will be comparatively easy. lit is rolling with a considerable amount of mesa country and many iarroyoA
 A. Wallis, Subcontraetor.
 The man who is in charge of the iconstruction work is A. Wallis. an old
 inner at the business. He is a subcon- tractor on this work under Grant brothers who have the contract for the entire extension. Wallis is a work
 CT and will push things to the best Iadvantage.
 The engineering corps of the South Tern Pacific maintains camp in the lcanyon two or three miles nearer the town. There are fifteen or twenty
 men in the camp, practically all of
 whom are Americans. They co-ope-
 rate at all times with the contractor
 and are at hand whenever wanted to settle any Rnotty point that may be encountered
 Work on the extension is going on from both ends now. To the south Grant brothers have an immense force of men at work and with everything satisfactory at that end they are now directing their personal attention to { this end of the line. Two or three more complete outfits will be thrown into Nacozari canyon within a week 1 or so and over a thousand men, if they can be secured, will be put to
 work. Labor is a problem the con tractors will have to face Sonora cannot be depended upon to furnish as much as is desired The pay is about S2.50 in Mexican money for com mon labor and inasmuch as the mines are paying considerably more than that the local source of labor supply Is entirely inadequate. To overcome this Mexicans are being brought in from the southern country and Chi nese labor will be extensively used. 1 The new concentration which H. Ken i yon Burch. chief engineer in charge of construction of the MocteZuma Cop | per company, has designed and whose prodigious proportions will occupy the entire side of a mountain, is now un- der construction and is hardly second | in interest at Nacozari to the plans Of the Southern Pacific railroad. The concentrator in itself is an immense undertaking. In size and capacity it will compare favoTably with any in the country but in equipment, construc- ton and uptodateness it will be with out peer. The men who are making ! it set themselves to the task. when | they began the work, of constructing the most modern and the most scien- tifcally equipped concentrating plant | in the world. That they will succeed there is little doubt
 There will be a number of innoya-
 tions in the construction of this plant,
 but the feature of it that will most ap- peal to constructing engineers, per haps, his the vast amount of cement that will go into it. Built up on the side of a mountain, there are retaining
 walls thirty-two feet high, three feet wide and 400 feet long built of solid
 concrete. The floors will be concrete and much of the equipment will be of
 reinforced concrete. One hundred
 yards of concrete are being used a day and it is estimated that fully 20- 900 yards will be used in the construc-
 ton of the plant.
 The site selected for the plant is on | the side of a mountain few hundred yards down the canyon from the mill. Looking up from the railroad track to the excavations they are not unre- mindful Of a great fortification with series of trenches. There Is a re- taining wall and then a cut, another retaining wall and another cut until the top of the hill is reached. There are ten retaining walls in all. The first is eighteen feet high and three | feet wide at the top. The width at the
 bottom varies on the different walls
 according to local conditions. One of these walls, the largest, is thirty-two
 feet high and 400 feet long.
 The foundations will be completed in
 two months and the concrete work in
 four months. The work will be ready for the steel in three months and 1000 tons will be used. The plant will be
 covered with corrugated steel It will
 be painted white on the inside and
 black on the outside.
 | The distance between the upper end
 of the plant, where the ores enter. to the lower end, where the concentrates
 come out, is 225 feet. This will afford one an idea of the immensity of the lplant.
 The concentration bins are to be of
 reinforced concrete and 100 settling
 tanks are to be of the same material In the finished plant there will be about 100 yanners, sixty concentrating Itables. f20 compartments of figs. twen- ty-four trcmmeis, ten 6-feet Chilean mills and six sets of 4z by Is rolls of lspecial design. Automatic sampling and weighing machines will be in
 stalled. The crushing plant will be separate from the concentrator and will have a capacity of 200 tons an
 hour. crushed through one and one half inch ring. Crushing will be done for the entire plant in ten hours Electric motors will be used through Iout the entire plant
 The capacity of the plant wfn be Il 1250 tons a day.
 MT. Burch. who Is responsible for
 the plant from the lowest retaining wall up, Is gTatfied at the progress
 being made on the plant He expects [, it to Do completed to every detail by I lAps1I I. 1908 The crusbing machinery