 | | 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...Federal lands within parts of five counties: Broadwater, Jefferson, Meagher, Powell, and Lewis and Clark...was discovered in the region in Powell County in 1852. Mining began in the 1860's, and since then the |  | | Report (issue) | | Resources of the Elkhorn Wilderness Study Area, Montana A cooperative study by the U.S. Geological Survey...deposit':?.. Elkhorn-Tizer Basin zone Elkhorn district -»_»_.,H"1 -? r7Q f i-L^ifciL P. d o-i-n DdO-Lll...Chalcedony veins Lead and zinc in brecciated Lowland Creek Volcanics Silver, lead, and zinc in rhyolite Placer...deposits Porphyry deposits Golconda area Jackson Creek area Turnley Ridge prospect Breccia pipe deposits...(Au-Ag-As-Pb-Cu) Southeastern area Vosburg stock Staubach Creek area Group II - Rare metal anomalies (Mo-W-Nb-La-Y-Th) |  | Klepper, Montis Ruhl, Ruppel, E.T., Freeman, V.L., Weeks, R.A. (1971) Geology and mineral deposits, east flank of the Elkhorn Mountains, Broadwater County, Montana. Professional Paper 665. US Geological Survey doi:10.3133/pp665 | Report (issue) | | East Flank of the Elkhorn Mountains, Broadwater County, Montana GEOLOGICAL SURVEY PROFESSIONAL PAPER...East Flank of the Elkhorn Mountains, Broadwater County, Montana By M. R. KLEPPER, E. T. RUPPEL, V. L..._______ Iron Age Gulch and Weasel Creek areas (Winston and Beaver Creeks)___________________ Parkare...__ 49 2. Morrison and Swift Formations near Montana Silver Star mine____________________________ 52...Silver Saddle adit, and January mine, Winston mining district. 3. Geologic map of parts of the Marietta |  | | Journal (article/letter/editorial) | | Montana Mineral Locality Index Downloaded by [University of Nebraska, Lincoln] at 20:00 09 April 2015...2015 K NOWN AS THE TREASURE STATE, Montana is rich in mineral and gemstone localities. The state motto...with its representation of mining tools clearly proclaim Montanaâs mining origins. Montanaâs production...published describing the occurrence, collecting, mining, and cutting of the two state gemstones. Figure...Granville Stuart established Montanaâs first mining camp at Gold Creek in 1860. Geologic Provinces The state |  | | Journal (article/letter/editorial) | | mesothermal Pb-Zn-Ag veins of the Coeur dâAlene district in northern Idaho (total production: Pb, 7.5 Mt;...associated polymetallic veins in the Butte district in Montana (total resource: Cu, 35 Mt; Zn, 4.6 Mt; Ag...years of production. Mining of 26 major vein deposits in the Coeur dâAlene district began in the 1880s...peaked about 1950. Production in the Coeur dâAlene district continues today from the Galena and Lucky Friday...access shaft). Mining at Butte began in 1875, with copper production peaking in 1917. Mining continues today |  | | Report (volume) | | Director Bulletin 842 OF THE GREATER HELENA MINING REGION MONTANA BY J. T. PARDEE and F. C. SCHRADER UNITED...______________________-__-_________--_------___-_ Ophir district.________________________________________________...__________---__--_-___ Austin district._.____..._..._._.____._____.____.___-.___._____ Marysville district.___________...___________________________________________ Gould district._______________________________________________ Stemple...._ Heddleston district.___________________________________________ Wolf Creek district.._..........__ |  | | Report (volume) | | Geology of the Canyon Ferry Quadrangle, Montana By JOHN B. MERTIE, JR., RICHARD P. FISCHER, and S....limestone___ _______________________________ Dry Creek shale ________________________ ·___________ Devonian...map of bentonite deposits northeast of Winston, Broadwater County, Mont ____________________________ In...and parallels 46°30' and 46°45' in west-central Montana. As a new dam on the Missouri River is to be built...shale, Pilgrim limestone, and Dry Creek shale. The Park and Dry Creek shales have not everywhere been separately |  | | Journal (article/letter/editorial) | | belt, including the deposits of the Blackbird district, have been analyzed for their sulfur, carbon,...values are nearly uniform throughout the Blackbird district, with a mean value for cobaltite (CoAsS, the main...(late 2011), construction is underway on a new mining operation that will exploit a reserve within the...settingâassemblages dominated by cobaltite and chalcopyrite in a metamorphosed siliciclastic sedimentary... metasandstone-, and argillite-dominated Apple Creek Formation (5.4 km thick), but also as crosscutting |  | | Journal (article/letter/editorial) | | Ag-Pb-Zn Vein Mineralization in the Coeur dâAlene District, Idaho JEFFREY L. MAUKâ Geology Department, University...mesothermal Ag-Pb-Zn vein ore in the Coeur dâAlene district of northern Idaho. Although it had long been recognized...the first 100 yr of mining in this district. In northern Idaho and western Montana, the Revett Formation...middle, and upper members. In the Coeur dâAlene district, most ore production south of the regionally significant...Formation. Base metal veins in the Coeur dâAlene district occur in relatively thick, chemically reduced |  | Graham, G., Hitzman, M. W., Zieg, J. (2012) Geologic Setting, Sedimentary Architecture, and Paragenesis of the Mesoproterozoic Sediment-Hosted Sheep Creek Cu-Co-Ag Deposit, Helena Embayment, Montana. Economic Geology, 107 (6) 1115-1141 doi:10.2113/econgeo.107.6.1115 | Journal (article/letter/editorial) | | Mesoproterozoic Sediment-Hosted Sheep Creek Cu-Co-Ag Deposit, Helena Embayment, Montana GARTH GRAHAM,1,â MURRAY W...the Mesoproterozoic Newland Formation. The Sheep Creek Cu-Co deposit occurs within a structural block along...in the fault system, where replacement-style chalcopyrite mineralization is spatially associated mostly...dolomite. Silicification and paragenetically late chalcopyrite, along with minor tennantite in the upper sulfide...pyrite, barite, and carbonate. The restriction of chalcopyrite to inferred synsedimentary E- and northerly |  | Nadoll, P., Mauk, J. L., Hayes, T. S., Koenig, A. E., Box, S. E. (2012) Geochemistry of Magnetite from Hydrothermal Ore Deposits and Host Rocks of the Mesoproterozoic Belt Supergroup, United States. Economic Geology, 107 (6) 1275-1292 doi:10.2113/econgeo.107.6.1275 | Journal (article/letter/editorial) | | the five following geologic settings in western Montana and northern Idaho has distinct geochemical signatures:...sediment-hosted stratiform Cu-Ag deposits (Spar Lake and Rock Creek) in Belt Supergroup metasedimentary rocks, (3) hydrothermal...hydrothermal Ag-Pb-Zn veins of the Coeur dâAlene district, (4) extensively deformed and partially altered...Belt Supergroup host rocks from the Coeur dâAlene district, and (5) two Cretaceous postmetamorphic igneous...and host-rock magnetite from the Coeur dâAlene district. In contrast, magnetite from postmetamorphic igneous |  | Lund, K., Tysdal, R. G., Evans, K. V., Kunk, M. J., Pillers, R. M. (2011) Structural Controls and Evolution of Gold-, Silver-, and REE-Bearing Copper-Cobalt Ore Deposits, Blackbird District, East-Central Idaho: Epigenetic Origins. Economic Geology, 106 (4) 585-618 doi:10.2113/econgeo.106.4.585 | Journal (article/letter/editorial) | | REE-Bearing Copper-Cobalt Ore Deposits, Blackbird District, East-Central Idaho: Epigenetic Origins K. LUND...(± Ag ± Ni ± REE) ore deposits of the Blackbird district, east-central Idaho, have previously been classified...section. New studies indicate that, across the district, mineralization was introduced into the country...associations across the district. Both early and late quartz veins contain chalcopyrite and pyrite, whereas...of a regional thrust fault. Specifically, the district lies within an oblique thrust ramp containing |  | | Journal (article/letter/editorial) | | argillaceous rocks are represented by the Garden Creek Phyllite and Ramshorn Slate. Calcareous rocks are...4), Wood River area (box marked as Fig. 2), Beaver Creek area (box marked as Fig. 3), Carrietown area...the Wood River area showing the locations of Deer Creek, Bullion, Croesus, McCoy, Minnimoore, Silverstar...two-mica granite Thompson Creek, Deer Creek, McCoy, Croesus, Beaver Creek (Pilgrim, Silver King), Vienna...Vienna, Carrietown, Rooks Creek, Dead Wood, White Cloud Peak, Little Boulder Creek, Treasure Vault PennsylvanianPermian |  | | Journal (article/letter/editorial) | | occur in the metasedimentary rocks of the Apple Creek Formation (Mesoproterozoic) in a linear belt called...partially overlap Pb isotope ratios of the Apple Creek Formation but would have been much less radiogenic...mineralization age of about 1400 Ma. Only the host Apple Creek Formation is known to have appropriate Pb isotope...belt ranges from Fe rich in the southeast (Iron Creek prospect) through Co-Cu rich in the middle (Black...Mesoproterozoic metasedimentary rocks of the Apple Creek Formation (formerly included in the Yellowjacket |  | | Report (issue) | | mines, particularly in the northern portion of the county. Large bodies of gravel of lower grade yet remain...particularly to Mr. H. L. Lowden, formerly county surveyor of Trinity County, who through many years by maps and...the whole of Trinity County except the south end and also the part of Humboldt County about the Hoopa Reservation...Mountains. The valleys of such streams as Coffee Creek, Swift Creek, and Stewarts Fork were occupied by glaciers...auriferous conglomerate of the Cottonwood mining district of Siskiyou County, Cal.," and recently G. F. Kay 3 |  | PerellĂł, JosĂ©, Clifford, John A., Wilson, Alan J., Kennedy, Sean, Creaser, Robert A., Valencia, Victor A. (2021) On the timing and metallogenic implications of the sediment-hosted stratiform copperâsilver mineralization in the Creston Formation (Belt-Purcell Supergroup), British Columbia, Canada. Ore Geology Reviews, 131. 104032pp. doi:10.1016/j.oregeorev.2021.104032 | Journal (article/letter/editorial) | | Washington State University, Pullman, WA 99164-2812, USA b A R T I C L E I N F O A B S T R A C T Keywords:...lithostratigraphic unit of the Ravalli Group of western Montana. The Ravalli Group hosts the largest sediment-hosted...presents Fig. 1. The Belt-Purcell Supergroup in the USA and Canada. a. Geographic extent of the Belt-Purcell...Belt-Purcell Supergroup within key areas of Canada and the USA, with established correlations between formations...strata of the Purcell Anticlinorium spanning the USA-Canada border and principal controlling structures |  | | Journal (article/letter/editorial) | | microprobe, etc.) Because New Mexico is a mining state, mining districts are given whenever possible in...2015 Bernalillo County Cerro Colorado, W. of Albuquerque: carnotite. Placitas district (Sandia Mountains)...Mountains), NE of Albuquerque: schorl. Tijeras Canyon district (Manzano Mountains), E. of Albuquerque. Galena...malachite. Catron County Apache Creek, N. of Reserve: quartz (chalcedony). Mogollon district, NE of Glenwood:...Park, SW of Reserve: labradorite. Taylor Creek Tin district, Black Range. Adobe Ranch: cassiterite, hematite |  | | Report (volume) | | Part of the Townsend Valley Broadwater and Jefferson Counties,x Montana GEOLOGICAL SURVEY BULLETIN...OF PART OF THE TOWNSEND VALLEY BROADWATER AND JEFFERSON COUNTIES, MONTANA By V. L. FREEMAN, E. T. RUPPEL...Valley, a broad intermontane basin in west-central Montana, extends from Toston to Canyon Ferry. The area...indicate GEOLOGY OF PART OF TOWNSEND VALLEY, MONTANA 483 epeirogenic movement, or crustal warping...gravel and valley-bottom alluvium along Indian Creek and a little has been mined from small lode deposits |  | | Journal (article/letter/editorial) | | ASSOCIATED WITH THE COEUR DâALENE MINING DISTRICT, IDAHO AND WESTERN MONTANA: INSIGHTS FROM ISOTOPES AND RARE-EARTH...associated with the Coeur dâAlene mining district, Idaho and western Montana, constrain the age and origin...calcite-dominant veins. Introduction The Coeur dâAlene mining district is one of the most important sources of Pb...âgreat Coeur dâAlene mineral beltâ of Idaho and Montana, a structural zone that extends ~160 km southeast...southeast from Coeur dâAlene, Idaho, to Superior, Montana (Fryklund, 1964; Hobbs and Fryklund, 1968). It is |  | | Report (volume) | | it helpful to refer to Survey Bulletin 507, "The mining districts of the western United States," and to...abundant, it may have been completely exhausted by mining or quarrying. Deposits of minerals of wide distribution...because they occur in sufficient quantity to warrant mining for their usual products but because they furnish...Collier, Eugene. Pennsylvania.... .Mr. R. R. Hice, Beaver. Prof. Florence Bascom, Bryn Mawr. Rhode Island...See Bauxite and Hallpysite. Asbestos. Tallapoosa County, with corundum deposits near Dudleyville; not found |  | | Journal (article/letter/editorial) | | alsoare zoned,froma centralzonewith a low pyrite/chalcopyrite ratio and generallylow total sulfides,througha...dominantchalcopyrite, then to a halo of high pyrite/chalcopyrite andhightotalâąulfideswhichgradesoutwardto lowertotal...workers undoubtedly recognize this problem (Meyer district-scale view of their characteristics. In addibetween...simply metamorphicrocks. In the more strongly chalcopyrite, Ti oxides,plagioclase, magnetite,anhyaltered...south-central part of the stock (Fig. 3). In contrast,chalcopyrite tendsto be most abundantin a zone approximatelyalong |  | | Report (issue) | | description of the geology, mining history, and production of the major gold-mining districts in 21 States...relations ---------------------------History of gold mining and trends in production_ J\labama -----------...--------------Cleburne County ----------~----------------- Tallapoosa County --------------------------Alaska...------------------Cochise County -----------------------------Gila County --------------------------------Greenlee...ee County ----------------------------R[aricopa County ----------------------------R[ohave County -- |  | | Report (volume) | | ....................................... 102 District of Columbia ......................................... 139 144 146 153 158 163 169 . 172 174 Montana..................................................to refer to Geological Survey Bulletin 507, "The mining districts of the western United States," and to...abundant it may have been completely exhausted by mining or quarrying. Deposits of minerals that are widely...because they occur in sufficient quantity to warrant mining for their usual products, but because they furnish |  | | Journal (article/letter/editorial) | | of deposits composed of cobaltite, Co pyrite, chalcopyrite, and gold with anomalous Nb, Y, Be, and rare-earth...in Cretaceous silver veins of the Coeur dâAlene district in the Belt Basin. The results show that in some...Blackbird, composed of cobaltite, Co pyrite, chalcopyrite, and native gold with anomalous Nb, Y, Be, and...metasandstones, and argillites of the 5.4-km-thick Apple Creek Formation (Fig. 1) â Corresponding author: e-mail...Quartzite and the 2.7-km-thick Yellowjacket Formation (Winston et al., 1999). Detrital zircon studies suggest |  | | Journal (article/letter/editorial) | | New Mexico Institute of Mining and Technology, Socorro, New Mexico 87801, USA Abstract The Copper Cliff...prospect, located 48 km east-southeast from Missoula, Montana, presents two distinct phyllic alteration events:...experience in Resolution (Arizona, USA), the Copper Cliff prospect (Montana, USA), and several other smaller...associated copper mineralization comprising mainly chalcopyrite and bornite (Sillitoe, 2010). The late phyllic...wavelength from 2,196 to 2,211 nm (Graham et al., 2018). Mining and Exploration History The Copper Cliff deposit |
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