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Show INTER-MOUNTA- IN inise Iron and Reduction works, under efficient management of Capt. t Junes Baxter, indicates at least an MINING REVIEW. Automatic High Speed Engine. The accompanying cut illustrates a ordinary degree of success in mining new type of automatic high speed enenterprises. When the establishment gine, recently brought out by the Denof that plant was first broached the ver Engineering Works of Denver, Mki of such a thing, as a business Colo. venture, was regarded by many of the The electric generator is coupled diones chimerical. as absurdly rect to the engine and is self contained, knowing of demand for the sub-bas- e Li ck of money, lack carrying the engine and of the insufficiency foundry products, generator. Two of the above engines were to be field supplied, mining were recently installed in the Colorado the disheartening arguments Telephone among building of Denver, and reemployed to embarrass the promoters peated tests showed a variation of less of the enterprise. But they persevered, than 1 cent, between no load and and today the Boise Iron and Reduc- full load. per tion works is one of the recogTwo more of the same style of engine institutions of the city. nized are now being built for the Colorado passed under the sole Having management and control of James Baxter & Son, who are machinists and engineers as well as practical mill men 5 to possess the peculiar felt-lik- e structures called by lithologists microfelsitic. The porphyry crystals are usually of a different color from the groundmass in which they are imbedded, and hence produce the striking effect which has made these rocks so famous in all ages and caused them to be used in the finest ornamentation in spite of their hardness. Accordingly as the porphyries vary in mineral composition they are divided into two principal varieties Quartz-porphyrwhich consists of the finegrained groundmass in which quartz alone or quartz and othoclase are por- phyritically developed, and orthoclase-porphyrin which orthoclase feldspar y, y, and miners, they have succeeded in overcoming popular prejudices and dis- trust, and 'have built up a profitable and growing business. They have probably the best plant in the interior Northwest, and are prepared to furnish quartz mills of any desired capacity, also all kinds and descriptions of castings and of mining and other machinery, and their work is equal to the best done abroad. All of which goes to prove that gold mining and kindred Industries are making material progress in our State. Boise, Ida., Aug. 31, 1896. The next annual convention of the Western Federation of Miners will be held in this city on the second Monday in May. The organization has grown rapidly during the past year that there will be a large attendance of delegates at this convention and it will be the most important gathering in the interest of organized labor ever held in Salt Lake City. There is one matter in connection with this meeting in which all citizens are interested. The Federation has decided to erect a home for disabled and aged miners and the site for this home will be determined at next years meeting. President Boyce states that he favors Salt Lake and believes this city can secure it if the citizens offer any reasonable so State Reformatory, and one for an electric plant for the Mining Exchange building of Denver. This company shipped last week to che Germania smelter, of this city, five Bruckner revolving cylinders, eight feet, six inches diameter, twenty-tw- o feet long, weighing, complete, about seventeen tons each. The cylinders are of a new design and contain many new improvements over the old style. The company is very busy on orders for smelting and concentrating plants and reports business much better than last year. The home is to be encouragement. built by popular subscriptions and will Porphyry. bn an institution of considerable magA Colorado geologist says the geologinitude. The contest for the location will be between Denver and Salt Lake, cal term porphyry is often confusing, and as this city can offer the advant- and frequently misapplied. Originally ages of a central location and superior the term is said to have been applied elimate, it certainly ought to be an to certain kinds of igneous rocks of a easy matter for it to carry the day. reddish or purple color, such as the o Nmething should be done in the way celebrated red porphyry or roseo of offering a suitable site. of Egypt. Popularly any finegrained, compact rock carrying large is in the Rand South Africa, says an crystals scattt'rcd through its mass exchange, mining engineers are able to called a porphyry, whatever may be its calculate the depth of reefs very closely composition. Geologists, however, relll to 3000 feet from the outcrop, as is strict this term to this acid (siliceous) shown in the case of one of the shafts eruptive rocks, consisting of a very inin the Robinson Deep, which, a year compact felsitic base formed of an John Hays Hammond calculated timate mixture of quartz and feldspar wuuia reach the reef at 1800 feet. The and in which one or both of these min1,M'f has lately been struck at a depth erals are porphyritieally developed, ol 1S06 feet. The average depth to that is, large crystals of feldspar or "hich the main reef series has been quartz are scattered throughout the This groundmass is sJ"I'ed is not over 400 feet, and this groundmass. c',mft demonstrates the permanency of usually too fine to allow a determinaunaided tl,, reef to 2000 feet in vertical depth, tion of its composition by the is found nearly 4000 feet on the incline. eye, and under the microscope an-tic- alone prevails in crystals, no quartz appearing porphyritieally or in the groundmass. Quartzless porphyries are usually termed porphyrites. Through an entire disapeparance of the porphyritic crystals, the rock passes into felsite. Magazine publishes an amusing story from one of the English coal mining districts where some of the mines had been drowned for years, and the many attempts to pump them dry had been ineffectual. After many thousand pounds had been spent in pumping without doing any good, it was found Cassiers that the water raised by the pumps had been allowed to find its way back into the mines, through old shafts, crevices and other avenues. It made both amusing and instructive reading, but if one simply changed the names the whole account sounded not much different from one hundred and one things within the experience of undoubtedly a great many engineers. Work is performed over and over again to no purpose, just because care is not taken to see that every stroke tells. The Canadian police, at on the Yukon, have levied Forty Mile, a tax of $15 mining claim in the district, but where there is doubt as to whether a claim is upon British soil, payment Is not exacted, though accepted if proffered, such payment entitling the claim owner to police protection, those who do not pay being left to protect on each The treasury deficit for the first two months of the fiscal year was nearly $24,000,000. |