 | | Report (issue) | | (including the Virginia City mining district), Madison and Beaverhead Counties, southwest Montana: Mineral-resource...Muddy mining district Blacktail mining district Cherry Creek mining district Chinatown mining district...Prairie mining district Medicine Lodge mining district Monida mining district Pony mining district Red Bluff...Bluff mining district Revenue mining district Ruby Mountains mining district Sheridan mining district...district Silver Star mining district Virginia City mining district Mapleton mine Browns Gulch area Alameda-Cornucopia-U |  | | Report (issue) | | ASSESSMENT OF THE HELENA NATIONAL FOREST, WEST-CENTRAL MONTANA Edited by R.G. Tysdal 1 , Steve Ludington2 , and...ASSESSMENT OF THE HELENA NATIONAL FOREST, WEST-CENTRAL MONTANA U.S. GEOLOGICAL SURVEY OPEN-FILE REPORT 96-683-A...in west-central Montana. It lies in the vicinity of Helena, the capitol city of Montana, and includes Federal...was discovered in the region in Powell County in 1852. Mining began in the 1860's, and since then the...References cited F. Mineral resource geology of mining districts/areas Lincoln Region by R.G. Tysdal, |  | | Journal (article/letter/editorial) | | THE BERYL-MOLYBDENITE DEPOSIT COUNTY, COLORADO. KENNETH OF CHAFFEE K. LANDES. INTEREST hasrecentlybeenaroused...stationon the D. & R. G. railroad near the mouth of Brown's Gulch. 1Worcester, P. G.: Molybdenite Deposits of...to Crawford, the monzoniteat the headwatersof Brown's Creek has beenseparatedfrom a much larger massin...were gray in color and finely granular. Both plagioclase and orthoclasefeldsparare present. The vein is...investigatorsreport the presenceof pegmatitesin the district and ascribethe origin of the beryl and associatedmineralsto |  | | Book (edition) | | MARIN COUNTY FREE LIBRARY 3 1111 00289 4184 \ I s Fifth Revised Edition A complete, state-by-state...gem minerals. A sharp sliver of agate, such as Montana moss agate, is also useful to test minerals near...intrusive rock is diorite, containing some quartz; plagioclase, the sodium feldspar; and the dark, iron and...the sapphires in the Missouri River near Helena, Montana, and the star garnets of Idaho. Distribution in...Maine, New Hampshire, Connecticut, New Jersey, Virginia, and North Carolina. In the West, the Rockies |  | | Report (issue) | | Mountains I I Jefferson and Broadwater Counties, Montana GEOLOGICAt ' SURVEY PROFESSIONAL Prepared partly...Mountains Jefferson. and Broadwater CountieS, Montana By HARRY w. SMEDES GEOLOGICAL URVEY PROFESSIONAL...____ _ Frequency diagrams of composition of plagioclase crystals in Cretaceous intrusive rocks __ Sketches...ELKHORN MOUNTAINS JEFFERSON AND BROADWATER COUNTIES, MONTANA BY HARRY ABSTRACT The northern Elkhorn Mountains...area of about 132 square miles in west-central Montana. The area includes parts of four major geologic |  | | Report (issue) | | Geological Survey Board and the Colorado Metal Mining Fund ~ oopr is PUBliC P[O'J>ERTY aud 1• DOt ~re~~o~...__________________________________________ _ 1 Summary of mining districts---.---------------------Introduction..._____________________ _ Copper deposits in Jefferson County __ _ F. M.D. property _____________ _ Malachite..._______________________ _ 68 68 68 68 Lone Chimney, Mill Gulch, and Copper King mines _____________________ _ Nisley...Cherry Creek and Douglas County placers _________________________ _ Mining districts in the mineral belt |  | | Journal (volume) | | Bingham, Utah, Mining Black Sand Page. Abbott, James W A Visit to Ely, Nevada Mining at Bingham, Utah...Greenwater District Ditto Ditto Ditto Abyssinia, Minerals In The Requirements of Modern Mining 70S 52...Charles [64 James W. 82 431 114 Nelll 815 District, British W Columbia, The 783 431 795 736 241...Tube-Mill Lining Forbes Rlckard 511 17 The Boundary District The Mineral Output of. In 1906 Broken Hill, Acid...D. Del prat Brown, Walter 8 A Filing System for Mining Engineers llucke, Horace W The Meaning of stria |
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