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Ridgeway Deposit

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Journal Article
Journal: Economic Geology
Published: 01 January 2005
Economic Geology (2005) 100 (1): 177–178.
... similar to distal (inner propylitic, outer propylitic, and sodic) hydrothermal alteration zones documented from Ridgeway and other porphyry deposits of the Cadia district ( Tedder et al., 2001 ; Holliday et al., 2002 ). However, these distal alteration zones are precisely that—zones of alteration...
Journal Article
Journal: Economic Geology
Published: 01 January 2005
Economic Geology (2005) 100 (1): 175–176.
... is important in distinguishing types of hydrothermal alteration and the effects of burial metamorphism. For example, Smith (1968) described conspicuously heterogeneous alteration in the Ordovician volcanic sequences of the Molong volcanic belt that hosts the Cadia porphyry deposits, including Ridgeway...
Journal Article
Journal: Economic Geology
Published: 01 December 2003
Economic Geology (2003) 98 (8): 1637–1666.
...Alan J. Wilson; David R. Cooke; Benjamin L. Harper Abstract Ridgeway is a high-grade gold-copper porphyry deposit (54 Mt at 2.5 g/t Au and 0.77% Cu), related to an alkalic intrusive complex of monzonitic composition. The deposit occurs within the Cadia district of New South Wales, Australia, which...
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Journal Article
Journal: Economic Geology
Published: 01 March 2005
Economic Geology (2005) 100 (2): 225–252.
... the Ridgeway deposit (felsic ash-flow tuff from the stratigraphic host of the North pit gold deposit). Generally, the zircons are fine grained, fractured, and contain crystal imperfections (corrosion, inclusions, and pits). 206 Pb/ 238 U zircon spot ages for all deposits span a wide range, mostly from 400...
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Series: Society of Economic Geologists Guidebook Series
Published: 01 January 1995
DOI: 10.5382/GB.24.09
EISBN: 9781934969779
... in South Carolina in the 1980’s. It is currently the only operating gold mine in the Eastern United States. The Ridgeway mine produces gold bullion from two bulk-mineable, open-pit deposits located one mile apart. Low-grade oxide and sulfide ore produced from the siliceous deposits is blasted and hauled...
Journal Article
Journal: Economic Geology
Published: 01 January 2007
Economic Geology (2007) 102 (1): 3–26.
...Alan J. Wilson; David R. Cooke; Holly J. Stein; C. Mark Fanning; John R. Holliday; Ian J. Tedder Abstract The Cadia district, located in the eastern Lachlan fold belt of New South Wales, Australia, comprises four gold-copper porphyry deposits (Ridgeway, Cadia Quarry, Cadia Hill, and Cadia East...
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Journal Article
Journal: Economic Geology
Published: 01 March 2007
Economic Geology (2007) 102 (2): 239–256.
... the same time as ore deposition. Relict mafic rock fragments present in the ore zones suggest contemporaneous bimodal (rhyolite-basalt) volcanism. The maximum formation age of the Russell deposit is younger than 558 Ma, which is similar to that of the larger, well known Brewer, Haile, and Ridgeway deposits...
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Fig. 3. Interpreted geology and structure of section 11050E through the Ridgeway deposit. Mineralization is intimately associated with monzonite intrusions of the Ridgeway Intrusive Complex. Minor dislocation of mineralization is associated with the North and Purple faults. In addition, variation in the stratigraphic thickness of the andesite-clast volcanic conglomerate unit that overlies the transitional unit is interpreted to suggest that the North fault was in extension during deposition of at least part of the Forest Reefs Volcanics and may have influenced localization of the Ridgeway Intrusive Complex. Abbreviations: cpx = clinopyroxene, FRV = Forest Reefs Volcanics, Om = Weemalla Formation, pl = plagioclase. Numbers after the Forest Reefs Volcanics lithology in the key refer to the lithofacies association discussed in the text.
Published: 01 December 2003
F ig . 3. Interpreted geology and structure of section 11050E through the Ridgeway deposit. Mineralization is intimately associated with monzonite intrusions of the Ridgeway Intrusive Complex. Minor dislocation of mineralization is associated with the North and Purple faults. In addition, variation
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Fig. 4. Interpreted geology and structure of section 22750N through the Ridgeway deposit. Abbreviations are explained in Figure 3.
Published: 01 December 2003
F ig . 4. Interpreted geology and structure of section 22750N through the Ridgeway deposit. Abbreviations are explained in Figure 3 .
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Fig. 2. Geology of the Cadia district and location of the principal zones of porphyry- and skarn-related gold-copper mineralization. The Ridgeway deposit is concealed by Miocene basaltic lava flows. The location of sections 11050E and 22750N at Ridgeway (Figs. 3 and 4, respectively) are also shown. Based on unpublished mapping of Newcrest Mining Limited (reproduced with permission), and modified from Holliday et al. (2002). Abbreviations: CIC = Cadia Intrusive Complex, FRV = Forest Reefs Volcanics.
Published: 01 December 2003
F ig . 2. Geology of the Cadia district and location of the principal zones of porphyry- and skarn-related gold-copper mineralization. The Ridgeway deposit is concealed by Miocene basaltic lava flows. The location of sections 11050E and 22750N at Ridgeway ( Figs. 3 and 4 , respectively) are also
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Fig. 6. A. Quartz porphyry breccia in the Brewer pit closely associated with gold and copper mineralization. Note large light-colored clasts of quartz porphyry in center of picture, which are cut by multiple generations of quartz veins. B. Thin section photograph showing rounded bright gray pyrite grains (py) enclosed by medium gray enargite (en), light gray chalcopyrite (ccp), and dark gray quartz (qtz; Brewer deposit). C. Rock sample showing alternating laminae of sericite (light gray) and pyrite (dark gray) from the Haile deposit. Folded fold crests and interference between fold pieces indicate two generations of isoclinal folding. D. Thin section photograph showing some of the multiple generations of pyrite commonly found in mineralized samples (Haile deposit). Coarse pyrite occurs in remobilized layers separated by pyrite-bearing mudstone. Layers contain pyrite pebbles. E. Felsic ash-flow tuff from the Persimmon Fork Formation in the North pit of the Ridgeway deposit, showing silicification of layers (light gray) marking isoclinal folds with well-developed axial-plane cleavage. Small isoclinal folds wrap the crest of the large folds. Silicification associated with the gold mineralizing event predated the first generation of folds (Offield, 1994). F. Thin section photograph showing layering typical of mineralized zones (Ridgeway deposit). Note sedimentary layering and graded bedding in fine pyrite crystals (bright gray). G. Thin section photograph showing remnants of volcanic textures (pumice fragments, light gray) and sulfide minerals (black; Barite Hill deposit). H. Thin section photograph showing large angular crystals of pyrite (py) containing blebs and stringers of sphalerite (sp), chalcopyrite (ccp), and galena (gn; Barite Hill deposit).
Published: 01 March 2005
-flow tuff from the Persimmon Fork Formation in the North pit of the Ridgeway deposit, showing silicification of layers (light gray) marking isoclinal folds with well-developed axial-plane cleavage. Small isoclinal folds wrap the crest of the large folds. Silicification associated with the gold
Series: Society of Economic Geologists Guidebook Series
Published: 01 January 1995
DOI: 10.5382/GB.24.08
EISBN: 9781934969779
... Abstract Renewed gold exploration in the Carolina slate belt of North and South Carolina that led to the discovery of the Ridgeway gold mine (#5 on Figure 1) by Amselco (now Kennecott) began at about the same time as the last Geological Society of America field trip to focus on southeastern...
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Fig. 4. Generalized geologic map of the Ridgeway gold deposit showing geologic units, pits, (from Gillon et al., 1998), and drill hole and zircon sample locations.
Published: 01 March 2005
F ig . 4. Generalized geologic map of the Ridgeway gold deposit showing geologic units, pits, (from Gillon et al., 1998 ), and drill hole and zircon sample locations.
Journal Article
Journal: SEG Discovery
Published: 01 April 2012
SEG Discovery (2012) (89): 1–22.
... the outer pyritic alteration halo above the Ridgeway deposit. † E-mail: [email protected] * Continued from the January Newsletter (no. 88) © 2012 The Society of Economic Geologists, Inc 2012 The Society of Economic Geologists, Inc During the discovery of the Cadia Hill...
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Series: Special Publications of the Society of Economic Geologists
Published: 01 January 2020
DOI: 10.5382/SP.23.30
EISBN: 9781629496429
... Abstract The Cadia district of New South Wales contains four alkalic porphyry Au-Cu deposits (Cadia East, Ridgeway, Cadia Hill, and Cadia Quarry) and two Cu-Au-Fe skarn prospects (Big Cadia and Little Cadia), with a total of ~50 Moz Au and ~9.5 Mt Cu (reserves, resources, and past production...
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Central Colorado Trough paleo-geographic reconstruction illustrates the three-stage interpretation of drainage reorganization and structural development of the northern Apishapa Uplift with modern-day co-ordinates for reference. Location is also shown in Figure 2. Stage 1—deposition of the Kerber, Sharpsdale, and Minturn formations (fms.) with stratigraphic thickness contours adapted from Minturn Formation in De Voto and Peel (1972). Stage 2—deposition of the lower Sangre de Cristo Formation with stratigraphic thickness contours adapted from De Voto and Peel (1972). Stage 3—deposition of the upper Sangre de Cristo Formation. Cambrianage igneous bodies are shown in green, and hypothesized Cambrian intrusion is marked with ?. Other Wet Mountains Cambrian igneous intrusions were adapted from Olsen (1977). Paleocurrent data inside the study area are from this study, and data from outside of the study area are from De Voto and Peel (1972) and Hoy and Ridgeway (2002). Paleocurrent data from this study and Hoy and Ridgeway (2002) are displayed as rose diagrams of all paleocurrent data from that interval and location, and with mean paleocurrent shown by an arrow. Paleocurrent data from Hoy and Ridgeway (2002) are the same in stages 2 and 3 because no distinction is made in stratigraphic data between the lower and upper portions of the Sangre de Cristo Formation.
Published: 18 January 2023
Figure 10. Central Colorado Trough paleo-geographic reconstruction illustrates the three-stage interpretation of drainage reorganization and structural development of the northern Apishapa Uplift with modern-day co-ordinates for reference. Location is also shown in Figure 2 . Stage 1—deposition
Journal Article
Journal: Economic Geology
Published: 01 July 2001
Economic Geology (2001) 96 (4): 891–902.
... for the gold deposits. Early pyrite textures are present in other major deposits of the Carolina slate belt, such as Ridgeway and Barite Hill, and these provide strong evidence for models whereby the sulfide ores formed prior to tectonism. The role of Paleozoic metamorphism was to remobilize and concentrate...
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Journal Article
Journal: Economic Geology
Published: 01 September 2021
Economic Geology (2021) 116 (6): 1309–1327.
..., Ridgeway, Brewer, and Barite Hill mines of the Carolina slate belt ( Foley and Ayuso, 2012 ). Located in South Carolina, these large pyrite-dominated gold deposits are hosted in hydrothermally altered metamorphic rocks of the Carolina terrane ( Fig. 1 ), originally part of a volcanic island arc that formed...
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Series: SEPM Special Publication
Published: 01 January 2011
DOI: 10.2110/sepmsp.097.311
EISBN: 9781565763074
... developed in dryland depositional environments. Their recognition has been used to indicate a range of controls, including climate, landscape stability, sedimentation rate, soil residence time, and proximity to alluvial channels (the pedofacies concept). A study of the Devonian Ridgeway Conglomerate...
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Series: GSA Field Guide
Published: 01 January 2016
DOI: 10.1130/2016.0042(01)
EISBN: 9780813756424
... Abstract The Haile gold mine is located in southern Lancaster County, South Carolina, near the town of Kershaw. Gold was discovered at the site in 1827, and four periods of mining have yielded 360,000 ounces of gold. The mine is located between the past producing Ridgeway and Brewer mines...
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