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Porcupine district porphyries

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Journal Article
Journal: Economic Geology
Published: 01 May 2001
Economic Geology (2001) 96 (3): 453-475.
...Matthew D. Gray; Richard W. Hutchinson Abstract The Porcupine mining district is the largest lode gold-producing district in North America, with production in excess of 62,000,000 troy oz. Nearly all of the Au has come from quartz-carbonate lode systems hosted by metamorphic rocks of greenschist...
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Journal Article
Journal: GSA Bulletin
Published: 01 September 1944
GSA Bulletin (1944) 55 (9): 1115-1142.
...JAMES ERIC LLOYD EVANS Abstract The porphyry of the Porcupine district, Ontario, has been considered pre-Timiskaming by some and post-Timiskaming by others. A detailed study reveals that it is the result of two processes—igneous intrusion and metasomatic replacement—separated by a period...
Journal Article
Journal: Economic Geology
Published: 01 September 2008
Economic Geology (2008) 103 (6): 1341-1363.
.... The database contains more than 1,000 analyses from samples collected in the Porcupine gold camp. Approximately 150 analyses out of the 1,000 characterize the geochemistry of the Central Formation of the Tisdale assemblage. Younger quartz-feldspar porphyries and quartz porphyries sericite schist cut...
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Journal Article
Published: 21 November 2018
Canadian Journal of Earth Sciences (2019) 56 (4): 399-418.
... there were two separate gold mineralization events in the Timmins–Porcupine camp: an early porphyry-related Cu–Au event (i.e., magmatic–hydrothermal) followed by a younger, structural event (i.e., orogenic) that was responsible for the bulk of the gold mineralization in the district. Corresponding...
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Journal Article
Journal: Economic Geology
Published: 01 November 2014
Economic Geology (2014) 109 (7): 2035-2050.
... Porcupine Volcanics dome underlying the mine district. Not only would caldera heat have warmed the brine and lowered its density, but more importantly it would have produced a remarkable decrease in the brine viscosity. An increase in temperature from 15° to 100°C could have increased the brine infiltration...
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Journal Article
Journal: Economic Geology
Published: 01 September 2008
Economic Geology (2008) 103 (6): 1285-1308.
.... commun., 2004) where F 1 folds are cut by porphyry dikes with an age of 2685.1 ±1.5 Ma (Ayer et al., unpub. data). In Timmins, an early fold set, refolded in the Porcupine syncline and predating the folded Timiskaming unconformity ( Burrows, 1915 ; Hodgson, 1983 ; Piroschco and Kettles, 1991 ), has...
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Series: Society of Economic Geologists
Published: 01 January 2017
DOI: 10.5382/Rev.19.02
EISBN: 9781629491172
... and foliated mafic and ultramafic rocks and quartz-feldspar porphyry (e.g., Holmes, 1948 ; Rogers, 1982 ; Hodgson, 1983 ; Moritz and Crocket, 1990 , 1991 ). Bleeker (2012) proposed that the Destor-Porcupine fault zone was initiated after early (D 1 ) fault imbrication as a deep reaching, listric...
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Journal Article
Journal: Economic Geology
Published: 01 May 1952
Economic Geology (1952) 47 (3): 260-304.
... of about three miles and a depth of over 5,000 feet, and one of the major deposits in the Porcupine gold district, Ontario, to a depth of 5,375 feet.The studies included conventional direct current arc methods using different techniques, but standardized conditions for samples from individual deposits...
Journal Article
Published: 01 March 1979
Canadian Journal of Earth Sciences (1979) 16 (3): 440-458.
...R. Kerrich; B. J. Fryer Abstract The Porcupine District, Abitibi Greenstone Belt, is one of the most extensive areas of Archaean auriferous mineralisation. At least two stages of lode-gold emplacement are recognised: the first stage involves gold-bearing carbonate–chert chemical sediments within...
Series: Reviews in Economic Geology
Published: 01 January 2000
DOI: 10.5382/Rev.13.01
EISBN: 9781629490205
... proximity of world-class lode gold deposits to “crustal-scale” deformation zones (e.g., Boulder-Lefroy, Destor-Porcupine). Linking of active faults is important for fluid focusing and effective transport of hydrothermal fluids. The hydrothermal fluids transport gold along the pathways as one or more neutral...
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Series: Society of Economic Geologists
Published: 01 January 2017
DOI: 10.5382/Rev.19.01
EISBN: 9781629491172
... The two most important fault zones in the southern Abitibi greenstone belt are the Porcupine-Destor fault zone in the north and the Larder Lake-Cadillac fault zone in the south ( Fig. 3 ). These fault zones are subvertical (70°–90°) and dip either to the north or south. They have highly variable...
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Journal Article
Journal: Economic Geology
Published: 01 November 2012
Economic Geology (2012) 107 (7): 1403-1432.
...Cynthia Dusel-Bacon; Nora K. Foley; John F. Slack; Alan E. Koenig; Robert L. Oscarson Abstract Volcanogenic massive sulfide (VMS) Zn-Pb-Cu-Ag-Au deposits of the Bonnifield mining district formed during Late Devonian-Early Mississippian magmatism along the western edge of Laurentia. The largest...
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Series: Special Publication
Publisher: Society of Economic Geologists (SEG)
Published: 01 January 2018
DOI: 10.5382/SP.21.01
EISBN: 9781629496405
... analyses of large mineral deposits across several world-class provinces, including porphyry Cu deposits in the Cordilleran arcs of Chile, Peru, southwest United States, and Mexico, sedimentary Cu deposits in the Central African Copperbelt, shale-hosted massive sulfide Zn-Pb-Ag deposits in the Carpentaria...
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Series: Reviews in Economic Geology
Published: 01 January 2000
DOI: 10.5382/Rev.13.15
EISBN: 9781629490205
... to transpressional collision of terranes to continent or terrane to terrane. Carlin and Carlin-like gold deposits are sited at continent-ocean plate convergent margins, or their intracratonic back arcs. Epithermal gold-silver and copper-gold porphyry deposits develop in ocean-ocean plate, to ocean- continental plate...
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Journal Article
Journal: Economic Geology
Published: 01 January 2003
Economic Geology (2003) 98 (1): 51-67.
... information can only be determined by precise single zircon dating on rocks from a well constrained, structural, and stratigraphic context. Gold is mostly found near the deformed contact between the Moose Lake quartz porphyry volcanic complex and stratigraphically underlying metasedimentary rocks. These rocks...
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Journal Article
Journal: Economic Geology
Published: 01 January 2003
Economic Geology (2003) 98 (1): 1-29.
... intrusion-related deposits appear to be best distinguished by their near-craton setting, in locations more distal from subduction zones than most orogenic gold deposits and in provinces that also commonly contain Sn and/or W deposits; relatively low gold grades ( < 1–2 g/t Au); and district-scale zoning...
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Journal Article
Journal: Economic Geology
Published: 01 November 2008
Economic Geology (2008) 103 (7): 1531-1562.
... within and outside of mining districts, including the classic Noranda VMS district, were analyzed for major and trace elements to validate their proposed favorability for hosting VMS deposits. Results indicate that all of the rhyolite types are prospective, but mineralization may differ from the classic...
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Journal Article
Published: 18 June 2001
Canadian Journal of Earth Sciences (2001) 38 (6): 963-974.
...Ludvik Prevec; William A. Morris Abstract Structural information about that portion of the economically important Destor–Porcupine Deformation Zone and its associated faults, which lie buried under many metres of Clay Belt sediments in the region north of Matheson, Ontario, must rely principally...
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Journal Article
Published: 01 February 2012
The Canadian Mineralogist (2012) 50 (1): 129-146.
... Porcupine fault are by-products of natural carbon sequestration of ultramafic rocks where the carbonates provided permanent storage for CO 2 . Experimental studies on carbon sequestration support earlier conclusions, based on fluid inclusion microthermometry, that the quartz + carbonate formed from fluids...
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Journal Article
Journal: Economic Geology
Published: 01 August 2012
Economic Geology (2012) 107 (5): 1043-1072.
...D. A. Schneider; J. Bachtel; A. K. Schmitt Abstract Quartz-carbonate-Au vein deposits in the Timmins-Porcupine gold camp, Abitibi greenstone belt, have equivocal protracted parageneses and formed during late to post-Kenoran (2750–2670 Ma) deformation and metamorphism. Secondary ion mass...
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