Ressources minérales de l'United States, 1914--Partie I -- Les métaux . thatappears ut de promettre et de développement futur. Le pays rockis pyroxénite péridotite et surtout, plus ou moins modifiée pour serpen-tine, et les deux formes d'appearto rock être connecté avec la genèse du minerai. Le même corps de roches de base ex-tend au sud-ouest de 12 kilomètres ou moreacross Castle Creek, Mears Creek, andShotgun bodiesof Creek, où plusieurs ont été extraits de chromite quelques yearsago.1 Le rendement total de cette beltto Janvier 1,1915, a été environ 3 400 tonnes longues, mais la pro-duction était plus grand en 1914 thanev

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Mineral Resources of the United States, 1914--Part I--Metals . ut 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 cent chromic oxide.A sample of the ore from Shotgun Creek as analyzed in the Surveylaboratory contained 43.87 per cent Cr203. It is of interest to note in connection with Shasta County that theNoble Electric Steel Co. has resumed operations at Heroult with aview to the manufacture of ferromanganese and ferrochrome.. Figure 3.—Section of Browns chromic ironore mine, Shasta County, Cal. a, Pyroxe-nite, in some places saxonite or dunite; b, lean ore—granular groups of chromite inpyroxene and olivine; c, ore richer in chro-mite, pyroxene, and olivine (?) altered tochlorite and chromic chlorite. i U. S. Geol. Survey Geol. Atlas, Redding folio (No. 138), p. 14, 1906; also California State Min. Bur. Bull.38, p. 270, 1906. CHROMIC IRON ORE. 11 SONOMA COUNTY. In Sonoma County some chromic iron ore occurs at the same locali-ties where so much magnesite has recently been found.1 In thedevelopment of the magnesite about 100 tons of chromite is said tohave been gathered from a number of small bodies near Healdsburghin 1912 and to have remained unsold. The ore appears to be of finequality, and being near railroad transportation and within 100 milesof San Francisco, it should be in demand. The Mutual Chemical Co. of America has kindly furnished (Ap

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