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Coeur d'Alene and other districts

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Journal Article
Journal: Economic Geology
Published: 01 September 2012
Economic Geology (2012) 107 (6): 1275–1292.
... on average in hydrothermal and host-rock magnetite from the Coeur d’Alene district. Factor 3 divides igneous magnetite from other magnetite occurrences. This factor also subdivides magnetite of an alkalic-ultramafic intrusive complex from that of the granitic stock. Hydrothermal magnetite from siderite...
FIGURES | View All (9)
Journal Article
Journal: Economic Geology
Published: 01 January 2002
Economic Geology (2002) 97 (1): 23–42.
... not only yield apparent ages as high as 1033 Ma, but values as low as 189 Ma are measured only a few miles away ( Armstrong, 1976 ). An age of 530 Ma at the Silver Summit mine in the Coeur d’Alene district was reported by Armstrong (1976) . When the ages of Ar-Ar increments are combined with others within...
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Journal Article
Journal: Economic Geology
Published: 01 May 1956
Economic Geology (1956) 51 (3): 223–247.
...Verne Charles Fryklund; Janet Daphne Fletcher Abstract Forty sphalerite samples from the Star mine, Coeur d'Alene district, Idaho, and 19 sphalerite samples from other Coeur d'Alene mines have been quantitatively analyzed by spectrographic methods for Fe, Cu, Pb, Cd, Ga, Ge, In, Mn, Co, and Hg...
Journal Article
Published: 01 February 2002
Mineralogical Magazine (2002) 66 (1): 215–229.
... compositions were frozen in by 175°C. Examining the composition data for other Ag tetrahedrite fahlores found in the Coeur d’Alene district and elsewhere, we conclude that the thermodynamic database provides an accurate description of phase equilibria, except possibly for very Fe-rich systems where further...
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Series: GSA Special Papers
Published: 01 September 2016
DOI: 10.1130/2016.2522(13)
... A succession of separate tectonic events affected Mesoproterozoic Belt Supergroup strata of NW Montana, just as in the better-displayed Coeur d'Alene Mining District of Idaho. A series of these established a tectonic zone historically known as the Lewis and Clark line, here re-identified...
Journal Article
Journal: Economic Geology
Published: 01 November 1954
Economic Geology (1954) 49 (7): 753–758.
... of the Coeur d'Alene district Silver Belt suggests that other ore shoots may exist that contain commercial quantities of cobalt and nickel. GeoRef, Copyright 2006, American Geological Institute. Abstract, Copyright, Society of Economic Geologists. Reference includes data from Bibliography and Index of North...
Journal Article
Journal: Economic Geology
Published: 01 May 1949
Economic Geology (1949) 44 (3): 169–185.
... magma. Formation of potash-rich solutions at the magmatic source appears to be a prerequisite for mineralization in the Coeur d'Alene as in many other mining districts. GeoRef, Copyright 2006, American Geological Institute. Abstract, Copyright, Society of Economic Geologists. Reference includes data...
Journal Article
Journal: GSA Bulletin
Published: 01 February 1944
GSA Bulletin (1944) 55 (2): 131–164.
..., but quartz, microcline, orthoclase, albite, and sphene have been introduced by late replacement. Most of the granite and adamellite resulted from replacement of the other types. The Gold Hill stock is more like the igneous rocks in the Coeur d’Alene district. The principal type is syenite with considerable...
Journal Article
Journal: Economic Geology
Published: 01 December 1982
Economic Geology (1982) 77 (8): 1851–1866.
...Earl H. Bennett; Ramesh Venkatakrishnan Abstract Two palinspastic reconstructions of the Coeur d'Alene mining district have generated similar geologic maps. One of the reconstructions is based on the types of ore deposits and movement along the Osburn and Dobson Pass faults. The other is based...
Journal Article
Journal: GSA Bulletin
Published: 01 October 1970
GSA Bulletin (1970) 81 (10): 3061–3072.
...BRUCE R CLARK Abstract Deformational features in argillaceous rocks of the Belt Supergroup in the Coeur d'Alene district indicate that the slaty cleavage was produced by mechanical reorientation of original clays during an early period of folding. Furthermore, this regional folding event probably...
Journal Article
Journal: Economic Geology
Published: 01 June 1960
Economic Geology (1960) 55 (4): 645–658.
...Austin Long; A. J. Silverman; J. L. Kulp Abstract Galena samples representing the vertical and geographical extent of the Coeur d'Alene mining district have been isotopically analyzed for Pb. The isotopic composition is essentially uniform at Pb 2O6 /Pb 2O4 = 16.44, Pb 2O7 /Pb 2O4 = 15.58, Pb 2O8...
Journal Article
Journal: Economic Geology
Published: 01 May 1940
Economic Geology (1940) 35 (3): 430–444.
...Philip John Shenon; Roger Harmon McConnel Abstract In mapping the closely folded Belt sediments of the Coeur d'Alene district, Idaho, the question frequently arises whether certain beds are overturned or not. The answer can in many cases be found by observing mud cracks, ripple marks, cross-bedding...
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F ig . 3. Location of measured sections in the <span class="search-highlight">Coeur</span> <span class="search-highlight">d’Alene</span> mining distric...
Published: 01 March 2004
F ig . 3. Location of measured sections in the Coeur d’Alene mining district. Major faults redrawn from Gott and Cathrall (1980) . The Snowstorm and Missoula Tunnel deposits, and the Military Gulch and Blossom Lakes sections contain sediment-hosted stratiform copper mineralization. All other
Journal Article
Journal: GSA Bulletin
Published: 01 September 1957
GSA Bulletin (1957) 68 (9): 1117–1140.
..., Saskatchewan, 1900 ± 50 m.y.; and the Wilber-force area, 1050 ± 20 m.y. Other probable ages are Bedford, New York, 350 m.y.; Colorado Plateau, 60 m.y.; Coeur d'Alene, 1200 m.y.; and Great Bear Lake, Northwest Territories, 1500 m.y. Although there may have been several regional metamorphic events...
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F ig . 4. Correlation diagram of mean δ 13 C and δ 18 O results for carbona...
Published: 01 January 2002
F ig . 4. Correlation diagram of mean δ 13 C and δ 18 O results for carbonate minerals from individual vein systems of the Coeur d’Alene mining district, Idaho ( Table 2 ). Positive correlation of δ 13 C and δ 18 O is typical of the covariation of these isotopic systems in carbonate minerals
Series: SEPM Special Publication
Published: 01 January 2007
DOI: 10.2110/pec.07.86.0065
EISBN: 9781565762947
...-bedded, dolomite-capped cycles, averaging 1.4 m thick. The Helena thins to 100 m on eastern thrust plates of the Front Range, thickens to 800 m north of Plains, Montana, but thins to 250 m in the Coeur d'Alene Mining District. Based principally on scattered halite casts, the crosscutting...
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F ig . 9. Comparison of radiometric age data for mineralization and some ot...
Published: 01 December 2004
. Lucky Friday, Bunker Hill, Galena, Baychief, and Sunshine are deposits in the Coeur d’Alene district.
Journal Article
Journal: Economic Geology
Published: 01 December 1967
Economic Geology (1967) 62 (8): 1092–1094.
...Roy A. Anderson Abstract Information published in U.S.G.S. Professional Papers 445 and 478 indicated to the writer that the structure of the Coeur d'Alene District in northern Idaho were developed by slumping along a rift graben that formed during late Precambrian time while the sediments were more...
Published: 01 January 1962
DOI: 10.1130/Petrologic.1962.217
EISBN: 9780813759425
...: Iron River, Michigan, oxidized iron formation and post-ore mineralization, 20° to 100° C; Balmat, New York, post-ore supergene mineralization, 90° C; Coeur d’Alene district, Idaho, 200° C; Iron Mountain, Missouri, 280°–365° C; and Iron Springs, Utah, 710° C. ...
Journal Article
Journal: Economic Geology
Published: 01 May 1955
Economic Geology (1955) 50 (3): 339–344.
...Verne Charles Fryklund; Richard Stanley Harner Abstract The cobalt and nickel content of pyrrhotite from the Highland-Surprise mine, Coeur d'Alene district, Idaho, was determined by spectrographic methods. The Co and Ni values fall within the ranges of values found by other investigators...