The ore deposits of Utah . mostof it changing to the hydrous oxide, but therehas probably been some enrichment from theremoval of other constituents. Some move-ment of the iron is indicated by its precipitationwith zinc in secondary deposits. Migration ofiron on a large scale is illustrated by the Tinticor Dragon iron mine, where iron derived fromthe oxidation of pyritized volcanic rock moveddownward and formed a large replacementbody in the underlying limestone. In non-calcareous rocks migration has apparently beenmuch greater. In some places it has appar-ently been largely dispersed, but in
The ore deposits of Utah . mostof it changing to the hydrous oxide, but therehas probably been some enrichment from theremoval of other constituents. Some move-ment of the iron is indicated by its precipitationwith zinc in secondary deposits. Migration ofiron on a large scale is illustrated by the Tinticor Dragon iron mine, where iron derived fromthe oxidation of pyritized volcanic rock moveddownward and formed a large replacementbody in the underlying limestone. In non-calcareous rocks migration has apparently beenmuch greater. In some places it has appar-ently been largely dispersed, but in other placesit may have been precipitated along fissures orother openings as hydrous oxide concentratedfrom disseminated sulphides. PART IL—RANGES AND DISTRICTS. WASATCH RANGE. REGION NORTH OF OGDEN. By G. F. LouGHLiN. BEAR RIVER RANGE. GENERAL FEATURES. North of Ogden, the Wasatch Mountains, asdefined by the United States GeographicBoard, consist of two distinct parallel rangeswhich are separated by depressions 4 to 10. miles wide. (See PI. I, in pocket.) The easternrange is often called the Bear River Range orPlateau. Tlie Bear River Range or Plateau extendsnorth from latitude 41° 45 to latitude 42° 45,between Cache Valley on the west and BearLake vaUey on the east. Its length is approxi-mately 120 miles and its average width 10 to15 miles. The Bear River Range includes the GardenCity or Swan Creek district in RichCounty and the districts of theHyrmn-Paradise region in CacheCounty. (See fig. 37.) Productionfrom these districts comprises smallshipments of lead and zinc ore anda little copper ore, all low in silverand gold and typical of depositsformed remote from important ig-neous intrusions. The period ofmineralization has not been deter-mined from local evidence. Figure 37.—Map showing relation of mining prospects to Bear River Range and over-thrast. The margin of the overthrust block is indicated by the heavy, broken line.(After R. W. Richards.) 216
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectminesandmineralresou
