USGS Professional Paper 1697 - Alaska Resources Library

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182 Metallogenesis and Tectonics of the Russian Far East, <strong>Alaska</strong>, and the Canadian Cordillera Progress Granitoid-Related Au Deposit The Progress granitoid-related Au deposit (A.N. Rodionov, written commun., 1991) consists of sulfide-poor veins and small veinlets that contain pyrite, arsenopyrite, quartz, and gold. In addition, the deposit contains poorly mineralized fracture zones, mylonite zones, and zones of metasomatically altered carbonate-chlorite-sericite rock. Mineralization occurs in a near a Late Cretaceous granitoid pluton and dikes Cross Section A Map 0 1 km A B B 100 m 0 -100 -200 that intrude Cambrian granitic and gabbro rocks of Sergeevka Complex. The average grade is 5.89 g/t Au. The deposit is also the source for local placer Au mines. Askold Granitoid-Related Au Deposit The Askold granitoid-related Au deposit (fig. 82) (M.I. Efimova and others, written commun., 1971; Efimova and others, 1978) consists of a Au-quartz vein stockwork in a Surficial deposits (Cenozoic) Granite porphyry (Late Cretaceous) Granodiorite (Late Cretaceous) Sedimentary rocks (Late Jurassic) Undifferentiated sedimentary rocks (Middle Jurassic) Undifferentiated metamorphic rocks (Permian) Undifferentiated granitoid rocks (Late Paleozoic) Gold-bearing shear and disseminated zones Diamond drill hole Fault Contact Figure 82. Askold Au granitoid-related Au deposit, Sergeevka metallogenic belt, Russian Southeast. Schematic geologic map and cross section. Minus elevations below sea level. Adapted from Goryachev (1995a). See figure 79 and table 4 for location.
greisenized Mesozoic granite that intrudes Paleozoic volcanic and sedimentary rocks. A K-Ar muscovite age for alteration associated with the vein is 83.2 Ma (Ishihara and others, 1997). The deposit is prospected to depths of more than 100 m. The deposit is of medium size with an average grade of 5.9 to 7.6 g/t Au. Origin of and Tectonic Controls for Sergeevka Metallogenic Belt The Sergeevka metallogenic belt is hosted in or near Cretaceous granitoid plutons and dikes that intrude the complex continental-margin arc Sergeevka terrane, which consists of (1) migmatized Cambrian gneissic gabbro and quartz diorite with a U-Pb zircon isotopic age of 500 to 527 Ma (J.N. Aleinikoff, written commun., 1992) and that contain large xenoliths of amphibolite, quartzite, marble, and calc-schist, and (2) the Early Ordovician biotite-muscovite Taphuin Granite with a muscovite Ar-Ar age of 491 Ma. Along with other units of the Khanka superterrane, the Sergeevka terrane is overlapped by Devonian continental-rift-related volcanic and sedimentary rocks, middle Paleozoic granitoid rocks, late Paleozoic granitoid rocks, and Permian back-arc-rift-related volcanic rocks. The Cretaceous granitoid rocks hosting the Sergeevka metallogenic belt are probably part of the East Sikhote-Aline volcanic-plutonic belt (fig. 79) of Late Cretaceous and early Tertiary age (Nokleberg and others, 1994c). This igneous belt consists chiefly of five major units (Nokleberg and others, 1994c)—(1) Early Cenomanian rhyolite and dacite, (2) Cenomanian basalt and andesite, (3) thick Turonian to Santonian ignimbrite sequences, (4) Maastrichtian basalt and andesite, and (5) Maastrichtian to Danian (early Paleocene) rhyolite. The East Sikhote-Alin belt also contains coeval, mainly intermediate-composition granitoid plutons. The East-Sikhote-Alin belt is equivalent to Okhotsk-Chukotka volcanic-plutonic belt on strike to the north in Russian Northeast, and is tectonically linked to the Aniva, Hidaka, and Nabilsky accretionary-wedge and subduction-zone terranes (Nokleberg and others, 2000). Other related, coeval metallogenic belts hosted in the East- Sikhote-Aline volcanic belt are the Kema, Luzhkinsky, Lower Amur, and Taukha,belts (fig. 79; table 3). Taukha Metallogenic Belt of B Skarn, Pb-Zn Skarn, Pb-Zn Polymetallic Vein, and Related Deposits (Belt TK), Eastern Part of Russian Southeast The Taukha metallogenic belt of B skarn, Pb-Zn skarn, Pb-Zn polymetallic vein, and related deposits (fig. 79; tables 3, 4) occurs in the eastern part of the Russian Southeast (Vasilenko and Valuy, 1998). The deposits in the metallogenic belt are mainly B skarn, Pb-Zn skarn, and Pb-Zn polymetallic vein deposits, which are hosted in or near mid- and Late Cretaceous and early Tertiary granitoid rocks of the East Sikhote-Alin volcanic-plutonic belt (Radkevich, 1991). This granitoid rocks Early Late Cretaceous Metallogenic Belts (100 to 84 Ma; figs. 79, 80) 183 of this belt intrude the intensely deformed Taukha accretionary-wedge terrane (Nokleberg and others, 1994c, 1997c). The major B skarn deposit is at Dalnegorsk; Pb-Zn skarns occur at Nikolaevskoe, and Partizanskoe; polymetallic vein deposits occur at Fasolnoe, Krasnogorskoe (table 4), Lidovskoe, Novo-Monastyrskoe (fig. 83; table 4), and Shcherbakovskoe; and a Fe skarn deposit occurs at Belogorskoe (fig. 84; table 4) (Nokleberg and others 1997a,b, 1998; Valuy and Rostovsky, 1998). An isolated porphyry Cu deposit occurs at Plastun, and an isolated Au-Ag epithermal vein deposit occurs at Soyuz (Valuy and Rostovsky, 1998). 90 m 40 m -10 m -60 m -110 m Ore Ore body body za zapodny zapodny N 5 Ore Ore body bodyN 5 Oxidized sulphide ore Massive primary ore Ore Ore body body vostochnoe vostochnoe Ore Ore body body N N 7 7 - - 8 8 - - 15 15 Linear and lenticular zones of stringer mineralization Diorite porphyry and diabase dikes Light gray silty shale Fault Contact 0 25 m Figure 83. Novo-Monastyrskoe Pb-Zn polymetallic vein deposit, Taukha metallogenic belt, Russian Southeast. Schematic cross section. Minus elevations below sea level. Adapted from Valuy and Rostovsky (1998). See figure 79 and table 4 for location.
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USGS Prepared in collaboration with
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U.S. Department of the Interior Gal
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iv Hart River SEDEX Zn-Cu-Ag Deposi
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vi Specific Events for Middle Throu
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viii Metallogenic Belts Formed Duri
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x Origin of and Tectonic Controls f
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xii Toodoggone Metallogenic Belt of
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xiv Slate Creek Serpentinite-Hosted
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xvi Left Omolon Belt of Porphyry Mo
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xviii Origin of and Tectonic Contro
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xx Chukotka Metallogenic Belt of Au
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xxii Plutonic Rocks Hosting East-Ce
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xxiv Skeena Metallogenic Belt of Po
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xxvi Bee Creek Porphyry Cu Deposit
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xxviii 36. Wellgreen gabbroic Ni-Cu
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xxx 87. Partizanskoe Pb-Zn skarn de
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Metallogenesis and Tectonics of the
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format (Nokleberg and others, 1996)
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logenesis of the region (1) subduct
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Subterrane—A fault-bounded unit w
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dilemma consists of two conflicting
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2 to 20 m thick. A related dolomite
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Lantarsky-Dzhugdzhur Metallogenic B
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Origin of and Tectonic Controls for
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Metallogenic Belts Formed During Pr
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as at Oz, Monster, and Tart, may al
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Monashee Metallogenic Belt of Sedim
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Clark Range Metallogenic Belt of Se
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in addition to the Fe deposits. Min
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study) consists of lenses, from 100
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Omulev Austrian Alps W Deposit The
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ock, including coarse clastic rock,
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lative metalliferous brines in a re
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Prince of Wales Island Metallogenic
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suite of deposits and host rocks ar
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margin of the North American Craton
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newly created terranes migrated int
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(Ryazantzeva and Shurko, 1992). The
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tonnes Au and an average grade of a
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mafic and felsic metavolcanic rocks
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intrusion from about 402 to 366 Ma
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mentary rocks of the Cambrian to De
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(Preto and Schiarizza, 1985; Schiar
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ate and clastic rocks and volcanicl
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(Nokleberg and others, 1994c, 1997c
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Berezovka River Metallogenic Belt o
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Finlayson Lake Metallogenic Belt of
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and barite in siliceous black turbi
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Windermere Creek (Western Gypsum) C
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(NX, DL, MY), Viliga (VL), and Zolo
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South of the main east-west-trendin
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ated subduction zone in the Wrangel
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icite-biotite-quartz bodies in frac
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Canada Cordillera. The granitoid ro
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Viliga (VL) passive continental-mar
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32; tables 3, 4) occurs along the n
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superterrane, consists mainly of ma
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ers, 1994c, 1997c). In southern Bri
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mental volcanic rocks of intermedia
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a resource of 34.3 million tonnes o
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potassic zone. Combined estimated p
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and quartz monzodiorite stock and s
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and Omolon (OM) cratonal terranes,
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in volcanic and volcaniclastic rock
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minor calcite, and sporadic pyrite
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supergene blanket are interpreted a
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deposits and occurrences consist of
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onto the Omulevka terrane to form t
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superterrane. This belt is interpre
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to form along the leading edge of t
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quartz, and is virtually not associ
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deposits are at Terrassnoe and Kuna
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Peschanka Porphyry Cu-Mo Deposit Th
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The belt is hosted in the Late Jura
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in a island arc that was tectonical
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and Early Cretaceous Koyukuk island
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The deposit consists of disseminate
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The Orange Hill deposit contains an
Page 163 and 164: 49; tables 3, 4) (Foley and others,
Page 165 and 166: locally Late Triassic marine volcan
Page 167 and 168: gold in a gangue of quartz, calcite
Page 169 and 170: Verkhoyansk granite belt, which int
Page 171 and 172: metallogenic belts are interpreted
Page 173 and 174: assemblages, which may have been mo
Page 175 and 176: during hypogene and supergene alter
Page 177 and 178: collision and regional thrusting, t
Page 179 and 180: Yur Au Quartz Vein Deposit The smal
Page 181 and 182: phase has a Rb-Sr isotopic age of 1
Page 183 and 184: sian Northeast. The belt is hosted
Page 185 and 186: Host Granitoid Rocks and Associated
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Page 189 and 190: Metallogenic Belts Formed During La
Page 191 and 192: y partly coeval plutons that range
Page 193 and 194: tion is interpreted as occuring by
Page 195 and 196: the Badzhal-Ezop and Khingan parts
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Page 199 and 200: as interpreted for the Rock Creek d
Page 201 and 202: source (Yeo, 1992). The Blow River
Page 203 and 204: 2000). The spatial location of the
Page 205 and 206: to the east in the central Yukon Te
Page 207 and 208: occur in a 30-km-long belt along ir
Page 209 and 210: The Emerald deposit has produced ap
Page 211 and 212: Metallogenic-Tectonic Model for Ear
Page 213: cham oceans were closed, and the Ch
Page 217 and 218: composition magmatic bodies (with a
Page 219 and 220: Origin of and Tectonic Controls for
Page 221 and 222: to Albian pelecypods (Nokleberg and
Page 223 and 224: quartz-arsenopyrite-pyrrhotite, pol
Page 225 and 226: thermally altered to siliceous and
Page 227 and 228: These ore bodies are as much as 1 m
Page 229 and 230: Eastern Asia-Arctic Metallogenic Be
Page 231 and 232: Demin, and Krasilnikov, 1974; Nekra
Page 233 and 234: 10 percent Cu, as much as 0.92 perc
Page 235 and 236: pyrite, pyrite, galena, sphalerite,
Page 237 and 238: content decreases with depth, as do
Page 239 and 240: azdelnoye, (2) porphyry Sn deposits
Page 241 and 242: Karalveem Au Quartz Vein Deposit Th
Page 243 and 244: Democrat (Mitchell Lode) Granitoid-
Page 245 and 246: with high-temperature and high-pres
Page 247 and 248: chalcocite and covellite and also h
Page 249 and 250: cum-North Pacific, (2) completion o
Page 251 and 252: (6) In the Paleocene (about 56 to 6
Page 253 and 254: sists of cinnabar and metacinnabari
Page 255 and 256: Eastern Asia-Arctic Metallogenic Be
Page 257 and 258: groups of deposits are interpreted
Page 259 and 260: Indian Mountain and Purcell Mountai
Page 261 and 262: and southeastern Alaska (Moll and P
Page 263 and 264: Nokleberg and others, 1995a; Bundtz
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g/t Au or 368.2 Au gold. The deposi
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wim Group and altered mafic dikes.
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Mount Nansen porphyry Cu-Mo deposit
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A Map 450 500 550 Cross section Dik
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Cretaceous and early Tertiary conti
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deposits, at Chichagoff and Hirst-C
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others, 1994c, 1997c). The signific
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tonnes grading 0.53 percent Ni, 0.3
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with a 0.25 percent cut-off. The de
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Bulkley Metallogenic Belt of Porphy
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Red Rose W-Au-Cu-Ag Polymetallic Ve
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ish Columbia and consists of severa
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during back-arc extension or transt
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stocks and dikes, is associated wit
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etrograde minnesotaite (Fe talc), F
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Specific Events for Early to Middle
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of fractured and faulted Permian-Tr
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sists of a mineralized fracture zon
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dolomite. Wall rock alteration incl
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elt of late Tertiary plutons that a
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plates that exhibit magnetic anomal
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stages (Petrenko, 1999): (1) In the
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mon. The deposit is of medium size
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Metallogenic-Tectonic Model for Lat
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The origin of the Hg deposits of th
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margin or island-arc tectonic envir
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Columbia: Implicatons for the Middl
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Bazard, D.R., Butler, R.F., Gehrels
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Bradley, D.C., Haeussler, P.J., and
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Bundtzen, T.K., Laird, G.M., Caluti
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Cecile, M.P., 1982, The lower Paleo
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Debari, S.M., and Coleman, R.G., 19
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U.S. Bureau of Land Management Open
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Cordilleran Orogen in Canada: Geolo
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Goldfarb, R., Hart, C., Miller, M.,
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Grove, E.W., 1986, Geology and mine
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Høy, T., 1982a, Stratigraphic and
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Jones, D.L., Silberling, N.J., Cone
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Kutyev, F. Sh., Baikov, A.I., Sidor
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Shield—Ultramafic magma and its m
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Manns, F.T., 1981, Stratigraphic as
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Miller, M.L., and Bundtzen, T.K., 1
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Mortimer, N., 1987, The Nicola Grou
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Noble, S.R., Spooner, E.T.C., and H
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Canada Annual Meeting, Saskatoon, S
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Perello, J.A., Fleming, J.A., O’K
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Far East—Mineralogical criteria f
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Roeske, S.M., Mattinson, J.M., and
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Schmidt, J.M., and Zierenberg, R.A.
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formation occurrences: Materialy po
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Struik, L.C., 1986, Imbricated terr
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Valuy, G., and Rostovsky, F., 1988,
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Wolfe, W.J., 1995, Exploration and
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Appendix Table 1. Mineral deposit m
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Table 2 Summary of correlations and
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Table 2—Continued Unit(s) and Cor
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Table 2—Continued Unit(s) and Cor
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Table 3—Continued Metallogenic Be
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Table 4. Significant lode deposits,
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Table 4—Continued Appendix 369 De
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Table 4—Continued Tracy Metalloge
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Table 4—Continued Appendix 373 In
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Table 4—Continued Deposit Name Mi
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Table 4—Continued Mainits Metallo
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Table 4—Continued Whitehorse Meta
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Table 4—Continued Appendix 389 LA
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Table 4—Continued Surprise Lake M
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Table 4—Continued Sredinny Metall
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