Transactions . e ore are located by were 147 producers of chrome ore in 1918; 120 in the 6 countiesof California and 27 in the 5 counties of Oregon, with a total shippedproduction of 27,185 short tons of all grades; of this amount 21,021 tonscame from California and 6164 tons from southwest Oregon. The total J. S. DILLER 137 amount of ore reported miijed in the Klamath Mountains in 1918 was48,571 short tons, of which 21,386 tons were unshipped. ? Blue Mountains of Eastern Oregon The chromite deposits of eastern Oregon, of which the general locationis shown in Fig. 22, occur chiefly
Transactions . e ore are located by were 147 producers of chrome ore in 1918; 120 in the 6 countiesof California and 27 in the 5 counties of Oregon, with a total shippedproduction of 27,185 short tons of all grades; of this amount 21,021 tonscame from California and 6164 tons from southwest Oregon. The total J. S. DILLER 137 amount of ore reported miijed in the Klamath Mountains in 1918 was48,571 short tons, of which 21,386 tons were unshipped. ? Blue Mountains of Eastern Oregon The chromite deposits of eastern Oregon, of which the general locationis shown in Fig. 22, occur chiefly in Grant County, about John DayValley between Dayville and Prairie City, the main point of railroadshipment. A less important group occurs in the valley of Granite Creek,near Sumpter. There are small areas in Baker County, on Conner Creek,about 20 mi. (32 km.) north of Huntington, and in Malheur County,15 mi. (24 km.) west of Huntington, where it is associated with redjaspery beds of chert full of so MILES Fig. 24.—Map showing serpentine areas and chromite deposits of easternOregon. (L. G. Westgate.) Lewis G. Westgate examined the Blue Mountain region in August,1918, hemapped the serpentine area (Fig. 24), and indicated the loca-tion of the mines. His report, which is my principal source of informa-tion, is now in com-se of publication by the United States GeologicalSurvey. The general geology of the Blue Mountains is similar to that of theSierra Nevada and Klamath Mountains. There are two main series ofrocks—an older series of Paleozoic and Mesozoic sedimentaries with someinterbedded lavas, cut by igneous intrusives, and a younger series ofTertiary lavas with associated sedimentary beds. The sedimentariesof the older series are slates and shales, with a small amount of limestone. 138 RECENT STUDIES OF DOMESTIC CliROMITE DEPOSITS Carl)Oiiif(ious, Triassic, Jurassic,^ and caily Crestacoous fossils havel)((ui identified in rocks of the lilue Mountains. Mo
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
