 | | Report (issue) | | A RECONNAISSANCE IN THE KOFA MOUNTAINS, ARIZONA. By EDWARD L. JONES, Jr. INTRODUCTION. LOCATION. The...area here designated the Kofa Mountains lies in the central part of Yuma County, Ariz. These mountains...the Castle Dome Range are the nearest. The Kofa mining district, from which the mountains derive their name...of the range. HISTORY. Although southwestern Arizona had been prospected for many years, particularly...when the La Paz placers, 40 miles northwest of the Kofa Mountains, were actively worked, this area received |  | | Report (volume) | | RECONNAISSANCE OP THE ORE DEPOSITS IN NORTHERN YUMA COUNTY, ARIZONA ROWLAND BANCROFT WASHINGTON GOVERNMENT...........-.-.----.----..-.-.........-:...- 14 Mining and metallurgy ...................................................... Conditions and cost of mining......................................... 15 15 Methods........................... 55 Clara Consolidated Mining Company's properties................... 59 Deposits........................................ 68 Viati Mining Company's property............................ |  | | Report (volume) | | ----- - --. ---- - --- - .A reconnaissance in the Kofa Mountain , Ariz., by E. L. Jon , jr. (pub] ished...reconnaissance of the Cottonwood -American Fork mining region, tab, by B.S. Butler and G. F. Loughlin...Preliminary report on t.he economic geology of Gilpin County, Colo., by E. S. Bastin and J. M. llill (publish..._____ .. __ . _.. ____. ___ a iterite in San Diego County, Cal., by W. T . chall er (published J an. 15,...11. 12. 13. 14. Sketch map of Yellow Pin mining district, Clark ounty, N v.. Contorted flow structure |  | | Journal (volume) | | ELECTROCHEMICAL SOCIETY MEMBER, AMERICAN INSTITUTE OF MINING ENGINEERS VOLUME XXV Supplementing Volumes I...Editor, Engineering and Mining Journal, New York, N. Y. H. Instructor in Mining, South Bethlehem, Pa....(with Y. E. Bogard) Vice President, Wah Chang Mining and Smelt¬ ing Co. Ltd., 233 Broadway, New York...Consulting Mining Engineer, 1411 Merchants Natl. Bank Bldg., San Francisco, Cal. Professor of Mining, Massachusetts...Assistant State Geologist, Albany, N. Y. Editor, The Mining Journal, 15 George St., The Mansion House, London |
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