E/MJ : engineering and mining journal . deposits of the Cottonwood districtsassociated with thrust faults constitute a special typeallied to the bed deposits. The origin of the deposits in the sedimentary rockscan best be approached by considering their relationto the deposits in adjacent igneous rocks of the originof which there seems little doubt. There is strongevidence that these classes of deposits were formed bysimilar solutions. The character of the solutions canbe judged only by their action on the rocks, and it, ofcourse, must be recognized that the same solution wouldact quite differ
E/MJ : engineering and mining journal . deposits of the Cottonwood districtsassociated with thrust faults constitute a special typeallied to the bed deposits. The origin of the deposits in the sedimentary rockscan best be approached by considering their relationto the deposits in adjacent igneous rocks of the originof which there seems little doubt. There is strongevidence that these classes of deposits were formed bysimilar solutions. The character of the solutions canbe judged only by their action on the rocks, and it, ofcourse, must be recognized that the same solution wouldact quite differently on rocks of different compositionas monzonite and limestone. The similarity may beindicated by the change effected by the more abundantconstituents, or it may be more strikingly evident bythe presence of some of the rarer elements, but theagency of similar solutions is indicated when the pro-portion of the more abundant constituents is similarlyshov^^l by the action on igneous and sedimentary coun- 2 £.84 FeO-MgO- MgO-. CHANGES OF LIMESTONE IN CONTACT Iron Springs district: a and b, fresh rock : A and B, San Francisco district; 1 and 2, fresh rock ; la and rods i, j, and h, altered rock lead-silver and lead-silver-copper-zinc deposits in manyareas, most productive in the Park City, Tintic, Bing-ham, Cottonwood, Ophir, and Stockton districts; silverdeposits of the Park City, Ophir, and Mercur districts;gold deposits of the IMercur district; and quicksilverdeposits of the Mercur and Marysvale districts. The important deposits of this type may be separatedinto fissure replacement deposits in which the replace-ment has extended only a short distance from the fis-sure, and bed deposits in which the replacement isconfined largely to certain beds or zones and may ex-tend into them for a considerable distance from the fis-sure. The more important deposits of the former oc-cupy fissures in quartzite, as in the Ontario fissure ofthe Park City dist
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectmineralindustries