Bulletin, Ausgabe 945U.S. Government Printing Office, 1946 |
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50 feet adit altered amphibolite average beach beds beryllium beryllium-bearing black sand body BULLETIN 945 PLATE Bureau of Mines chromiferous sand chromite chromite deposits claim concentrates contain Contour interval County diabase dikes diopside diorite disseminated district Drill dunite east explored exposed fault feet long feet thick feet wide FLORENCE Four Chromes fractures Gallon Jug garnet GEOLOGIC MAP GEOLOGICAL SURVEY grade grains granulite Hellroaring Plateau helvite Highline holes igneous rocks indicated Iron Mountain layers lens lenses limestone Line Creek Plateau magnetite mass massive tactite metamorphic rocks miles minerals monzonite NORTH MAGNETIC NORTH occur olivine percent Cr203 peridotite porphyry quartz quartzite range recrystallized Red Lodge rhyolite ribbon rock samples San Luis Obispo saxonite scheelite SECTION ALONG LINE serpentine Seven Devils shale short tons silicated Silver Run Plateau Strike and dip surface tactite terrace trenches TRUE NORTH MAGNETIC tungsten