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U.S. Geological Survey Open-File Report 96-513-B

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U.S. Geological Survey Open-File Report 96-513-B Significant Lode Deposits of Russian Far East, Alaska, and Canadian Cordillera Deposit No. Deposit Name Major Metals Grade and Tonnage Latitude Metallogenic Belt Minor Metals Longitude Deposit Type Summary and References K52-01 Slavyanovskoe As Small. 42°54'N Laoelin As quartz vein 130°54'E Consists of a series of north-south-striking, elongate quartz veins hosted in Paleozoic (Silurian?) mica-graphite schist and metasandstone. Quartz veins, up to 4 to 5 m thick, can traced for several hundred m. Arsenopyrite is the dominant ore mineral, and occurs both as disseminations and as lenticular accumulations in quartz. Minor galena also occurs Lenses of sphalerite also occur conformable to bedding of the metasedimentary rocks. The genesis of the deposit is questionable. Vein formation is interpreted as related to Cretaceous accretion and associated metamorphism of Paleozoic island arc volcanic and associated sedimentary rocks. A.F. Frizh, written commun., 1932; N.E. Gritsenko, written commun., 1958; V.V. Ratkin, this study. K53-01 Skalistoe Mo Small. Average grade of 0.02-0.2% Mo, 43°36'N Samarka W 0.15-2.8% W2O3. 133°45'E Porphyry Mo Consists of molybdenite, pyrite, and wolframite that occur as thin veinlets and small masses in lenticular quartz and quartz-sericite zones up to 10 m thick. Local chlorite-sericite alternation and some garnet-amphibole skarn. Ore bodies are traced to a depth of 100 m. Deposit is hosted along contact of a hypabyssal stock of Paleogene granite porphyry and occurs both within and outside the pluton, between the country-rock and a miarolitic phase of the granite. Granite porphyry intrudes Jurassic turbidite deposits. Pokalov, 1972. K53-02 Nizhnee Sn, Pb, Zn Small. Average grade of 0.002-0.02% 43°37'N Luzhkinsky Sn polymetallic vein Pb; 0.33-1.53% Sn; 2.0% Zn. Mined in 134°15'E 1970's. Consists of Pb, Zn, Cu, and Fe sulfides and cassiterite that occur in the central parts of altered zones that contain tourmaline-chlorite-quartz and tourmaline-chlorite-quartz-hydrosericite alteration. Altered zones occur in mineralized fracture zones that are located along the margin of a caldera formed of intermediate composition, Late Cretaceous volcanic and interlayered volcanic-sedimentary rocks that exhibit intense propylitic and biotite alteration. Petrachenko, 1974. K53-03 Shcherbakovskoe Pb, Zn Small. Average grade of 3-5% Pb;1-4% 43°35'N Taukha Sn Sn; 2-9% Zn. 134°28'E Polymetallic vein Consists of northeast-trending, steeply-dipping, elongate (up to 300 m) veins, from 0.1 to 1.5 m thick that occur in Early Cretaceous sandstone and siltstone. Major ore minerals are sphalerite, galena, pyrrhotite, pyrite, and marcasite. Gangue minerals are quartz and calcite. Galena-sphalerite-pyrrhotite aggregates dominate and commonly occur along schistosity with pyrrhotite and sphalerite boudins coated by lenticular galena envelopes. Fractured sulfide ores are filled with sulfide-carbonate cement that contains jamesonite and secondary galena and sphalerite. Greisen-like cassiterite-bearing topaz-fluorite-mica veinlets cut sulfide ore. No definite relationships between mineralization and granitic intrusions is observed. Deposit includes small bodies of pre-ore gabbro and felsic and andesitic dikes that are genetically related to Late Cretaceous volcanic rocks that surround the deposit. Radkevich and others, 1960. K53-04 Fasolnoe Pb, Zn Small. Average grade of 0.1-30.0% Pb; 43°35'N Taukha Sn 0.01-0.3% Sn; 0.1% Zn. 134°42'E Polymetallic vein Consists of small en-echelon veins within a northwest-striking zone in a sequence of Upper Cretaceous (Cenomanian-Turonian) felsic volcanic rocks. Ore minerals are magnetite, sphalerite, galena, pyrrhotite, pyrite, arsenopyrite, cassiterite, valleriite, and cubanite. Host volcanic rocks are intensely altered to chlorite minerals with local garnet. Magnetite and cassiterite are closely associated with chloritic alteration. Radkevich and others, 1960. Significant Lode Deposits of Russian Far East, Alaska, and Canadian Cordillera Deposit No. Deposit Name Major Metals Grade and Tonnage Latitude Metallogenic Belt Minor Metals Longitude Deposit Type Summary and References K53-05 Soyuz Ag, Au Small. Average grade of 1.27 g/t Au; 43°25'N Taukha Au-Ag epithermal vein 127.9 g/t Ag. 134°20'E Consists of veins, veinlet zones, and adularia-quartz, quartz, and mica-quartz bodies with sulfides and sulfosalts. Gold occurs in a quartz-adularia-argentite-sulfosalt assemblage. Quartz-sulfide veinlets lack gold. Deposit hosted by argillic-altered calc-alkalic, Late Cretaceous (88-65 Ma) rhyolite and related tuff. Ore bodies occur along faults. No relationship with intrusive rocks is observed. E.D. Petrachenko, written commun., 1975. K53-06 Benevskoe W Small. Average grade of 0.44 to 3.15% 43°06'N Samarka W skarn W2O3. 133°43'E Consists of two zones containing skarn and hydrothermal alteration that contain approximately 30 ore bodies ranging from a few m to 200 m long and from 0.6 to 6 m thick. Skarns consist of magnetite, garnet, pyroxene-garnet, garnet-epidote, and garnet-orthoclase types. Scheelite is dominant ore mineral, with minor magnetite, arsenopyrite, pyrite, and rare cassiterite. Gangue minerals are quartz, feldspar, amphibole, epidote, biotite, and tourmaline. Late stages alterations consist of quartz-sericite and zeolitie.Late-stage quartz-feldspar and quartz-amphibole overgrowths replace skarn and contain nest-like veinlets and disseminated ore minerals. Skarns occur in veins and lenses that are located along the contact of Early Cretaceous biotite alaskite, granite porphyry, and granodiorite. Granitic rocks intrude sandstone and siltstone that are part of a Middle and Late Jurassic accretionary wedge complex is cut by numerous dikes of aplite, diorite and basalt porphyry, quartz diorite, granite porphyry, and granodiorite porphyry. V.D. Shlemchenko and others, written commun., 1983. K53-07 Krinichnoe Au Small. Contains up to 2.8 g/t Au and 42°54'N Sergeevka Granitoid-related Au up to 171 g/t Ag. 132°29'E Consists of gold-pyrite-quartz, and quartz-carbonate zones in a Late Cretaceous granitic pluton that intrudes metamorphosed Paleozoic volcanic and sedimentary rocks. Sulfide-poor gold-pyrite-quartz occurs in ore bodies of variable shape and size. S.M. Rodionov, written commun., 1991. K53-08 Askold Au Medium. Average grade of 5.9-7.6 g/t 42°44'N Sergeevka Granitoid-related Au Au. 132°20'E Consists of a gold-quartz vein stockwork in a greisenized Mesozoic granite that intrudes Paleozoic volcanic and sedimentary rocks. Deposit prospected to depths of more than 100 m. M.I. Efimova and others, written commun., 1971; Efimova and others, 1978. K53-09 Balykovskoe Au Small 42°58'N Sergeevka Granitoid-related Au 132°57'E Consists of: (1) Ore-bearing thrust zones with gold-pyrite-quartz veins; and (2) quartz veins with galena, sphalerite, and silver. Deposit formed in two stages. Deposit occurs in Late Cretaceous granite that surrounds and intrudes early Cambrian gabbroic rocks of the Sergeevka Complex with a U-Pb age of 527 Ma (John N. Aleinikoff, written commun., 1985). Fineness of gold is 600. E.D. Petrachenko (this study). Significant Lode Deposits of Russian Far East, Alaska, and Canadian Cordillera Deposit No. Deposit Name Major Metals Grade and Tonnage Latitude Metallogenic Belt Minor Metals Longitude Deposit Type Summary and References K53-10 Progress Au Medium. Average grade of 5.89 g/t Au. 42°52'N Sergeevka Granitoid-related Au 132°50'E Consists of sulfide-poor pyrite-arsenopyrite-gold-quartz veins, small veinlets, poorly mineralized fracture zones, zones of mylonite, and zones altered to metasomatic carbonate-chlorite-sericite rocks. Deposit hosted in a Late Cretaceous granitic pluton that cuts a sequence of granitic-gabbro rocks of Sergeevka Complex with a Cambrian age of 500 to 527 Ma (J.N. Aleinikoff, wrtten commun., 1992). The deposit is prospected to depths of a few tens m. This lode is also the source for nearby placer Au deposits. A.N. Rodionov, written commun., 1991. K53-11 Porozhistoe Au Small. Average grade of 5.39 g/t Au. 42°54'N Sergeevka Granitoid-related Au 133°28'E Consists of sulfide-poor gold disseminations and veins in cataclastic and schistose zones that occur in metamorphosed gabbroic rocks of the Cambrian Sergeevka Complex. Main sulfide minerals are pyrite, pyrrhotite, and chalcopyrite. Gangue minerals are quartz, biotite, sericite, chlorite, and carbonate minerals. Gold occurs as disseminations in chlorite-bearing gabbroic rocks and also as thin veins and veinlet networks. Deposit associated with Late Cretaceous granitic plutons in the area. I.I. Fatianov and others, written commun., 1988. K55-01 Golovninskoe S, FeS Small. Contains an estimated few tens 43°53'N Kuril Sulfur-sulfide. of thousands tonnes averaging 10-25% 145°36'E S. Consists of sulfur-bearing bodies, approximately 4 m thick and containing 20-25% S that are deposited at the floor of boiling lake in the caldera of Holocene Golovnin volcano, and near fumarolic vents at the foot of extrusive domes. Sulfur ooze overlies sediments rich in melnikovite (FeS2, amorphous pyrite) and poor in sulfur (up to 10% S). Quaternary age of mineralization. Vlasov, 1977. L52-01 Komissarovskoe (Vorob'eva Au, Ag Small. Average grade of 1.92 g/t Au 44°34'N plad) Au-Ag epithermal vein and 49-52 g/t Ag. 131°27'E Laoelin-Grodekovsk Consists of low-grade gold-silver-pyrite and minor galena and sphalerite that occur in metasomatic sericite-biotite-quartz bodies, fracture zones, and short veins. Deposit hosted in dacitevolcanic rocks, presumably part of a Permian volcanic sequence. Very low grade gold also occurs short quartz veins in an associated Permian sedimentary sequence, and are conformable to bedding, and are also folded and cross-cutting. Mineralization occurred in areas of higher carbon contents in thin-bedded siltstone and argillite.
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