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Macraes Deposit

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Journal Article

Round Hill Shear Zone-Hosted Gold Deposit, Macraes Flat, Otago, New Zealand: Evidence of a Magmatic Ore Fluid Available to Purchase

Cornel E. J. de Ronde, Kevin Faure, Colin J. Bray, David J. Whitford
Journal: Economic Geology
Published: 01 August 2000
Economic Geology (2000) 95 (5): 1025–1048.
DOI: https://doi.org/10.2113/gsecongeo.95.5.1025
...Cornel E. J. de Ronde; Kevin Faure; Colin J. Bray; David J. Whitford Abstract The 0.8-Moz Round Hill shear zone-hosted gold deposit is one of several located on, or near, the Hyde-Macraes shear zone, Macraes Flat, New Zealand. Field relationships show stockwork veins are the oldest part...
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View PDF for article title, Round Hill Shear Zone-Hosted Gold <span class="search-highlight">Deposit</span>, <span class="search-highlight">Macraes</span> Flat, Otago, New Zealand: Evidence of a Magmatic Ore Fluid
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Photomicrographs of gold-bearing sulfides from the Macraes deposit (New Zealand). A: Transmitted light image of pyrite (circled by dashed lines) surrounded by graphitic shears (dotted lines) that contain fine-grained carbonaceous material (CM) and sulfides, especially arsenopyrite. B: Backscattered electron (BSE) image of pyrite surrounded by graphitic shears. Pyrite is light gray and arsenopyrite is white. C: Transmitted light image of pyrite overprinting graphitic shears. D: BSE image of pyrite overprinting graphitic shears.

Photomicrographs of gold-bearing sulfides from the Macraes deposit (New Zea... Available to Purchase

Published: 01 February 2017
Figure 1. Photomicrographs of gold-bearing sulfides from the Macraes deposit (New Zealand). A: Transmitted light image of pyrite (circled by dashed lines) surrounded by graphitic shears (dotted lines) that contain fine-grained carbonaceous material (CM) and sulfides, especially arsenopyrite. B
Journal Article

Sources of Metals and Fluids in Orogenic Gold Deposits: Insights from the Otago and Alpine Schists, New Zealand Available to Purchase

Iain K. Pitcairn, Damon A. H. Teagle, Dave Craw, Gema R. Olivo, Robert Kerrich, Tim S. Brewer
Journal: Economic Geology
Published: 01 December 2006
Economic Geology (2006) 101 (8): 1525–1546.
DOI: https://doi.org/10.2113/gsecongeo.101.8.1525
... to amphibolite facies rocks. The belt contains abundant orogenic gold deposits, including the 125-t Au Macraes deposit. As such, the schist belt is an ideal geologic setting for investigation of the sources of metals and fluids responsible for formation of metamorphic rock-hosted gold deposits. A large suite...
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View PDF for article title, Sources of Metals and Fluids in Orogenic Gold <span class="search-highlight">Deposits</span>: Insights from the Otago and Alpine Schists, New Zealand
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Journal Article

Detecting hydrothermal graphite deposition during metamorphism and gold mineralization Available to Purchase

Iain K. Pitcairn, Steve Roberts, Damon A. H. Teagle, Dave Craw
Published: 01 May 2005
Journal of the Geological Society (2005) 162 (3): 429–432.
DOI: https://doi.org/10.1144/0016-764904-139
...Iain K. Pitcairn; Steve Roberts; Damon A. H. Teagle; Dave Craw Abstract Fourier Transform IR analyses of carbonaceous material from the Otago and Alpine Schists and the Macraes gold deposit of the South Island, New Zealand, show the progressive effects of graphitization during metamorphism...
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View PDF for article title, Detecting hydrothermal graphite <span class="search-highlight">deposition</span> during metamorphism and gold mineralization
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Figure 10. (A) CO2-N2-CH4 ternary diagram for fluid-inclusion gases from Benmore and Aviemore quartz + prehnite ± epidote ± pumpellyite veins (see Table 2). Gases from these inclusions plot in the same general field and are distinct from the field containing the gold-rich veins of the large Macraes gold deposit (de Ronde et al., 2000). (B) Organic (methane-ethane-propane) gas ternary diagram for the same samples shown in A. The main ore veins (i.e., flats, ramps, and stockwork veins) of the Macraes deposit again plot in a distinct field, although there is some overlap of Macraes stockwork veins with the Benmore data. These stockwork veins are the earliest veins recorded at the Macraes deposit and represent an early, meteoric water–dominated fluid, similar to that described in this study (de Ronde et al., 2000)

Figure 10. (A) CO 2 -N 2 -CH 4 ternary diagram for fluid-inclusion gases ... Available to Purchase

Published: 01 August 2001
of the large Macraes gold deposit ( de Ronde et al., 2000 ). (B) Organic (methane-ethane-propane) gas ternary diagram for the same samples shown in A. The main ore veins (i.e., flats, ramps, and stockwork veins) of the Macraes deposit again plot in a distinct field, although there is some overlap
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F ig . 1. A. Inset shows location of the Macraes Flat area and the Hyde-Mac... Available to Purchase

Published: 01 August 2000
hydrothermal quartz vein localities. B. Simplified geology and structure of the Macraes gold deposits along the Hyde-Macraes shear zone. Combined Round Hill, Southern Pit, and Innes Mill pit outline from August 1996. Figures given in italics are combined historical gold production and gold reserves for each
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F ig . 7. A–G. Variation diagrams of some gases measured in fluid inclusion... Available to Purchase

Published: 01 August 2000
F ig . 7. A–G. Variation diagrams of some gases measured in fluid inclusions within ore veins from the Round Hill (RH) and other Macraes deposits. The various hydrocarbons are positively correlated with CO 2 and with each other and reflect interaction of hydrothermal fluid with organic-bearing
Journal Article

Structural Setting of Gold Mineralization within the Hyde-Macraes Shear Zone, Southern New Zealand Available to Purchase

Andrew Allibone, Philip Jones, Hamish Blakemore, Dave Craw, Doug MacKenzie, Jonathan Moore
Journal: Economic Geology
Published: 01 March 2018
Economic Geology (2018) 113 (2): 347–375.
DOI: https://doi.org/10.5382/econgeo.2018.4553
...Andrew Allibone; Philip Jones; Hamish Blakemore; Dave Craw; Doug MacKenzie; Jonathan Moore Abstract The 10 Moz Macraes gold deposit in southern New Zealand is hosted within a 100-m-thick slice of weakly altered schist and the overlying Hanging-wall shear. This shear marks the base of the >1.5-km...
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View PDF for article title, Structural Setting of Gold Mineralization within the Hyde-<span class="search-highlight">Macraes</span> Shear Zone, Southern New Zealand
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Journal Article

Age and Origin of Orogenic Gold Mineralization in the Otago Schist Belt, South Island, New Zealand: Constraints from Lead Isotope and 40 Ar/ 39 Ar Dating Studies Available to Purchase

James K. Mortensen, David Craw, Douglas J. MacKenzie, Janet E. Gabites, Thomas Ullrich
Journal: Economic Geology
Published: 01 June 2010
Economic Geology (2010) 105 (4): 777–793.
DOI: https://doi.org/10.2113/gsecongeo.105.4.777
..., with no overlap. Lead isotope compositions from the sulfides from the Macraes group of deposits form part of a less radiogenic cluster, together with Pb isotope compositions for sulfides from scheelite-rich veins in the Glenorchy camp. Lead isotope compositions for sulfides from younger, postmetamorphic quartz...
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View PDF for article title, Age and Origin of Orogenic Gold Mineralization in the Otago Schist Belt, South Island, New Zealand: Constraints from Lead Isotope and 40 Ar/ 39 Ar Dating Studies
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Cross-sections through the OSB, showing the basement structure in relation to orogenic Au deposits. (a) Section across the Hyde-Macraes Shear Zone and neighbouring structures (see Fig. 4 for location). (b) Enlarged section through the Hyde-Macraes Shear Zone (see A for location) which hosts the Macraes mine.(c) Sketch section across a mineralized normal fault (see A for location). (d) Section across the NW OSB (location in Fig. 4), showing the geological relationships between Early Cretaceous W-rich orogenic vein systems at Glenorchy, and Miocene Au-bearing orogenic veins.

Cross-sections through the OSB, showing the basement structure in relation ... Available to Purchase

Published: 27 February 2015
Fig. 5. Cross-sections through the OSB, showing the basement structure in relation to orogenic Au deposits. ( a ) Section across the Hyde-Macraes Shear Zone and neighbouring structures (see Fig. 4 for location). ( b ) Enlarged section through the Hyde-Macraes Shear Zone (see A for location
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(A) Map of the Hyde-Macraes shear zone showing the extent of larger shears within the shear zone and the location of gold deposits and prospects identified by mid-2016. The northeastern margin of the shear zone is located somewhere between the northeasternmost mineralized shears shown on the map and the Waihemo fault zone. The so-called Footwall fault juxtaposed the southwestern edge of the Hyde-Macraes shear zone against unmineralized younger schists approximately 15 m.y. after mineralization. Whereas most shears strike in a northwest direction, several swing to a west-southwest strike toward the western side of the area mapped. (B) Location of the Hyde-Macraes shear zone and Otago schist within South Island, New Zealand.

(A) Map of the Hyde-Macraes shear zone showing the extent of larger shears ... Available to Purchase

Published: 01 March 2018
Fig. 1. (A) Map of the Hyde-Macraes shear zone showing the extent of larger shears within the shear zone and the location of gold deposits and prospects identified by mid-2016. The northeastern margin of the shear zone is located somewhere between the northeasternmost mineralized shears shown
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F ig . 2. A. Southwest-northeast across-strike section through the Round Hi... Available to Purchase

Published: 01 August 2000
F ig . 2. A. Southwest-northeast across-strike section through the Round Hill deposit along Macraes grid 15150N. B. Northwest-southeast along-strike section along Macraes grid 69850E (see Fig. 1 for location). Drill holes shown are those sampled during this project. Flat and ramp veins
Image
Geological map of the OSB, with principal structural/metamorphic domains (after MacKenzie &amp; Craw 2005), showing the principal orogenic Au deposits (white lines), and locations of cross-sections (black dotted lines) in Figure 5. HMSZ, Hyde-Macraes Shear Zone (hosting Macraes mine); R&amp;S, Rise &amp; Shine Shear Zone. Inset shows the distribution of Mesozoic schistose rocks (shaded) including the OSB, and the box shows the location of the main map.

Geological map of the OSB, with principal structural/metamorphic domains (a... Available to Purchase

Published: 27 February 2015
Fig. 4. Geological map of the OSB, with principal structural/metamorphic domains (after MacKenzie & Craw 2005 ), showing the principal orogenic Au deposits (white lines), and locations of cross-sections (black dotted lines) in Figure 5 . HMSZ, Hyde-Macraes Shear Zone (hosting Macraes mine
Journal Article

Resolving the role of carbonaceous material in gold precipitation in metasediment-hosted orogenic gold deposits Available to Purchase

Si-Yu Hu, Katy Evans, Dave Craw, Kirsten Rempel, Kliti Grice
Journal: Geology
Published: 01 February 2017
Geology (2017) 45 (2): 167–170.
DOI: https://doi.org/10.1130/G38462.1
...Figure 1. Photomicrographs of gold-bearing sulfides from the Macraes deposit (New Zealand). A: Transmitted light image of pyrite (circled by dashed lines) surrounded by graphitic shears (dotted lines) that contain fine-grained carbonaceous material (CM) and sulfides, especially arsenopyrite. B...
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View PDF for article title, Resolving the role of carbonaceous material in gold precipitation in metasediment-hosted orogenic gold <span class="search-highlight">deposits</span>
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Journal Article

In Situ 87 Sr/ 86 Sr of Scheelite and Calcite Reveals Proximal and Distal Fluid-Rock Interaction During Orogenic W-Au Mineralization, Otago Schist, New Zealand Available to Purchase

Emma J. Scanlan, James M. Scott, Victoria J. Wilson, Claudine H. Stirling, Malcolm R. Reid, Petrus J. Le Roux
Journal: Economic Geology
Published: 01 November 2018
Economic Geology (2018) 113 (7): 1571–1586.
DOI: https://doi.org/10.5382/econgeo.2018.4603
..., while scheelite 87 Sr/ 86 Sr values in the Hyde-Macraes shear zone and the Barewood and Bendigo deposits overlap with the age-corrected 87 Sr/ 86 Sr values of the host Rakaia terrane, scheelite 87 Sr/ 86 Sr values in the Glenorchy and Waipori deposits are commonly more radiogenic than the age-corrected...
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View PDF for article title, In Situ 87 Sr/ 86 Sr of Scheelite and Calcite Reveals Proximal and Distal Fluid-Rock Interaction During Orogenic W-Au Mineralization, Otago Schist, New Zealand
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Includes: Supplemental Content
Image
Structure contour plan of the Hanging-wall shear in the northwestern part of the Macraes mine between Golden Point and Innis Mills. A major frontal ramp 100 to 140 m high and two near flat-lying jogs dominate the km-scale structure of the Hanging-wall shear in this part of the deposit. Round Hill pit is centered on a swarm of minor near-vertical NE-striking shears and quartz veins that splay off a minor right-hand lateral ramp in the overlying Hanging-wall shear. Marked changes in the strike and dip of the Hanging-wall shear occur over several hundred m at the northern end of Golden Point and the southern end of Innis Mills, the latter in the vicinity of the younger Macraes and Innis Mills faults.

Structure contour plan of the Hanging-wall shear in the northwestern part o... Available to Purchase

Published: 01 March 2018
Fig. 3. Structure contour plan of the Hanging-wall shear in the northwestern part of the Macraes mine between Golden Point and Innis Mills. A major frontal ramp 100 to 140 m high and two near flat-lying jogs dominate the km-scale structure of the Hanging-wall shear in this part of the deposit
Journal Article

Structural controls on gold-bearing quartz mineralization in a duplex thrust system, Hyde-Macraes shear zone, Otago Schist, New Zealand Available to Purchase

Damon A. H. Teagle, Richard J. Norris, Dave Craw
Journal: Economic Geology
Published: 01 December 1990
Economic Geology (1990) 85 (8): 1711–1719.
DOI: https://doi.org/10.2113/gsecongeo.85.8.1711
...Damon A. H. Teagle; Richard J. Norris; Dave Craw Abstract The Hyde-Macraes shear zone in east Otago, New Zealand, is a low-angle north- to northeast-dipping thrust system in which gold-bearing quartz veins have been deposited. Mineralization accompanied deformation in the shear zone which...
View PDF for article title, Structural controls on gold-bearing quartz mineralization in a duplex thrust system, Hyde-<span class="search-highlight">Macraes</span> shear zone, Otago Schist, New Zealand
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F ig . 12. Data for fluid inclusion δD H 2 O and calculated δ 18 O H 2 O ... Available to Purchase

Published: 01 August 2000
F ig . 12. Data for fluid inclusion δD H 2 O and calculated δ 18 O H 2 O (VSMOW), where T h data are available, for different veins from the Macraes gold deposits (mainly Round Hill). The Macraes data are interpreted to represent O isotope shifted meteoric water (with an inferred starting
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Geological map of the Otago and Alpine schists, South Island, New Zealand, showing the Caples and Torlesse terranes, metamorphic isograds, sample localities (squares or boxes), gold deposits (black dots), and the Alpine Fault – Austro-Pacific plate contact. Abbreviations: HMSZ: Hyde Macraes Shear Zone, DMOB: Dun Mountain Ophiolite Belt.

Geological map of the Otago and Alpine schists, South Island, New Zealand, ... Available to Purchase

Published: 01 October 2010
F ig . 1. Geological map of the Otago and Alpine schists, South Island, New Zealand, showing the Caples and Torlesse terranes, metamorphic isograds, sample localities (squares or boxes), gold deposits (black dots), and the Alpine Fault – Austro-Pacific plate contact. Abbreviations: HMSZ: Hyde
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F ig . 13. A. Ternary diagram for the gases CO 2 , N 2 , and CH 4 trapped ... Available to Purchase

Published: 01 August 2000
F ig . 13. A. Ternary diagram for the gases CO 2 , N 2 , and CH 4 trapped by type I fluid inclusions. The majority of the Round Hill and other Macraes data fall in a narrow field near the CO 2 apex, with only the hanging-wall shear samples plotting off toward the N 2 apex. Shown for reference