The Mexican mining journal (1915) (14592052980)

Identifier: mexicanminingjou1920unse (find matches)

Title: The Mexican mining journal

Year: 1905 (1900s)

Authors:

Subjects: Mines and mineral resources

Publisher: Mexico City : Mexican Pub. Co. S.A.

Contributing Library: University of Illinois Urbana-Champaign

Digitizing Sponsor: University of Illinois Urbana-Champaign

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seem to be a far more trustworthy guide inpractice; but even in this case the term has only alimited application on account of changes due to theageing of materials in use. A steel rope may start fromthe factory with a high breaking limit, but this becomescontinually lower in use, partly as a result of continuedand repeated stresses inducing fatigue, partly by rea-son of deterioration of the material. The latter factoris especially serious in the case of certain metals andalloys entering now somewhat largely into the cons^truction of machinery of all kinds. Mr. Stromeyerremarks that the risk of ageing is so great that someengineers are becoming shy of using certain nickelsteel alloys and some brasses and bronzes, becausethese sometimes become absolutely rotten after a timeeven although they may be perfectly satisfactory whennew. There is much yet that remains to be investi-gated in the mysterious diseases to which some metalsseem to be liable. February, 1915. 4 Vmexican mining journal

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Map of Sonora. 51 THE MEXICAN MINING JOURNAL February, 1915. Alamos—Promontorios Districts, Sonora. Special Correspondence. Owing to various causes, such as the low price ofsilver, the unsettled conditions in Mexico during thepast four years, the paralyzed condition of business ingeneral on account of the European war, and the dif-ficulty of operating on a large enough scale to insurea profit, the three great old mines—the Promontorios,the Quintera, and the Minas Nuevas—have been closeddown for sometime, but there has been a steady ievel-opment. The following will give an idea of what hasbeen going on. The San Manuel, owned by Don Rafael Ibarra, hasbeen quite extensively worked by a great open cut tento fifteen feet wide and several hundred feet long., aridfrom this winzes have been sunk so as to extract fcfiegrade of ore that can be treated in arrastras andvalues recovered by the patio process. Some six orseven hundred feet of work has been done in this wayand the owner has mad

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1915

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