Ressources minérales de l'United States, 1914--PARTIE I--Métaux . es ans attractedmore attention que d'autres en Californie. Ils se trouvent près de la ligne de rigidification de la Southern Pacific Railroad et convenientlylocated sont économiques pour l'exploitation minière. Ils commencent à la frontière nord du comté près de l'arrêt Dunsmuir Browns Mine, qui est la prin-cipal producteur de chromite dans l'État et a été dans operationsince 1906. Cette mine est à environ un kilomètre de la ligne de chemin de fer et environ 700 je Dolbear, S. H., l'exploitation minière, appuyez sur [Min. et Sci. Appuyez sur la touche], mars 6,1915, pp. 358-359. 2 Fairbanks, H. W., U.S. Geol. Survey Geol.

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Mineral Resources of the United States, 1914--Part I--Metals . ecent years attractedmore attention than any others in California. They lie near themain line of the Southern Pacific Railroad and are convenientlylocated for economic mining. They begin on the northern border ofthe county near Dunsmuir in Browns Mine, which has been the prin-cipal producer of chromite in the State and has been in operationsince 1906. This mine is within a mile of the railroad and about 700 i Dolbear, S. H., Mining Press, [Min. and Sci. Press], Mar. 6, 1915, pp. 358-359. 2 Fairbanks, H. W., U. S. Geol. Survey Geol. Atlas, San Luis folio (No. 101), p. 14, 1904; Harder, E. C, Chromic iron ore: U. S. Geol. Survey Mineral Resources, 1908, pt. 1, p. 767, 1909. 3 California State Min. Bur. Bull. 38, p. 269, 1906. 10 MINERAL RESOURCES, 1914 PART I. feet above it, so that gravity plays an important part in the -deliveryby tramway and wagon of the ore at the railroad. The accompany-ing map (fig. 2) and section (fig. 3) show the locality of the mine andthe position of the ore body.. x Chromite locality „ X Browns chromite mine Figure 2.—Map showing chromic iron ore localities in Shasta County, Cal. The ore body, about 25 feet in width, may be traced for nearly 100feet in a direction S. 54° W. It is well exposed in an open cut thatappears to promise well for future development. The country rockis chiefly pyroxenite and peridotite, more or less changed to serpen-tine, and both forms of rock appearto be connected with the genesis ofthe ore. The same body of basic rocks ex-tends southwest for 12 miles or moreacross Castle Creek, Mears Creek, andShotgun Creek, where several bodiesof chromite were mined a few yearsago.1 The total output of this beltto January 1, 1915, has been approxi-mately 3, 400 long tons, but the pro-duction was larger during 1914 thanever before, amounting to 867 shorttons, of which 567 were sold and 300 were stored. The average runof the ore as marketed is reported to be 45 per cen

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