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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) Summary cross section through part of the Hyde-Macraes shear zone between Innis Mills and the Eastern lodes showing the extent of haloes of mineralized schist around each shear. (B) Map showing the position of strands of the Hyde-Macraes shear zone superimposed on an image of the airborne electromagnetic (EM) conductivity data (7200-Hz band). Some strands of the shear zone coincide with zones of elevated conductivity, whereas other strands such as the southeastern part of the Hanging-wall shear are no more conductive that the surrounding schist. NE-trending zones of elevated conductivity coincide with Cenozoic faults. EM survey specifications were flight lines in northeast direction 50 m apart at a terrain clearance of 30 m, the latter locally exceeded for safety reasons in some steeper areas.]()
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![First thumbnail for: Geochemical signatures of mesothermal Au-mineraliz...]()
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![First thumbnail for: In Situ 87 Sr/ 86 Sr of Scheelite and Calcite Reve...]()
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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.]()
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![(A) Map of the central core of the Macraes mine showing the location of major workings, important structures, and the position of the main highway. Approximately half of the gold discovered within the Hyde-Macraes shear zone is located in the Frasers area, a further 25% at Round Hill and Golden Point, and almost 10% at Innis Mills. These are the most richly endowed parts of the shear zone discovered to date. (B) Schematic sketch cross section through the Macraes mine illustrating the position of high- and low-grade mineralized rocks with respect to the Hanging-wall shear and Footwall fault.]()
![General location and regional tectonic map of the Otago Schist belt, South Island, New Zealand, showing locations of gold-bearing mineral occurrences. HMSZ = Hyde-Macraes shear zone; RSSZ = Rise and Shine shear zone (modified from Craw et al., 2006a).]()
![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); R&S, Rise & 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.]()
![The Otago and Alpine Schists, South Island, New Zealand, forming the Torlesse and Caples terranes. A continuous crustal section is exposed from unmetamorphosed greywackes to amphibolite-facies schists (garnet–oligoclase zone) exposed during Miocene to recent uplift along the Alpine Fault. Sample localities are shown, including the Macraes gold mine and the NW–SE-striking Hyde–Macraes Shear Zone (HMSZ). GS, greenschist.]()
![Map of the Otago region showing the different terranes, extent of regional metamorphism, and mineralized lodes in the region. HMSZ = Hyde-Macraes shear zone, RSSZ = Rise and Shine shear zone. Bottom left inset: Glenorchy region with the four lodes sampled from Mt. Judah. Over 12 W lodes occur here but are obscured by the sample identifiers. Modified from Paterson (1986), MacKenzie and Craw (2005), and Pitcairn et al. (2006).]()
![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.]()
![Geologic map of the Otago and Alpine schists, South Island, New Zealand, showing the Caples, Torlesse, and Aspiring terranes, metamorphic isograds, samples localities (boxes and squares), and the Alpine fault-Austro Pacific plate contact. DMOB = Dun Mountain ophiolite belt, HMSZ = Hyde Macraes shear zone. Modified from Mortimer, (2000).]()
![Geologic map of the Otago and Alpine schists, South Island, New Zealand, showing the location of ore deposits and the metamorphic isograds within the Otago and Alpine schists. Elements that were extracted economically and directions of strike and dip (where available) of structures that host the deposits are also included. Abbreviations: DMOB = Dun Mountain ophiolite belt, HMSZ = Hyde Macraes shear zone, R = reverse fault. Modified from Paterson (1986) and Mortimer (2000).]()
![A. Schematic cross section through Otago during the first mineralization event (142–135 Ma) showing the formation of fluids through dehydration at the greenschist-amphibolite (gs-amp) facies transitions. The interpreted fluid pathways are shown of the Glenorchy (with Paradise) and Hyde Macraes shear zone (HMSZ) deposits. The Rakaia-Aspiring boundary has been simplified. Depths of emplacement for mineral deposits and brittle ductile transition (BDT) are from Mortensen et al. (2010b). B. Cross section of the second mineralization event (~105 Ma) after uplift and erosion showing the interpreted fluid pathways that formed the Waipori, Bendigo, and Barewood deposits.]()
![Average 87Sr/86Sr isotope composition of scheelite for the deposits formed in the earlier mineralizing event (142–135 Ma). The Caples terrane bounds are defined only by samples from the Glenorchy region (Graham and Mortimer, 1992; this study). All host-rock data have been age-corrected to 135 Ma. Measured epidote 87Sr/86Sr from two Caples terrane grayschists overlaps with whole-rock Caples terrane values at 135 Ma. Aspiring and Rakaia values from Adams and Graham (1997), Adams and Maas (2004), and Wellnitz (2017). Darker bands represent most common host-rock values within each terrane as evaluated as the graphical mode from plotted data. HMSZ = Hyde-Macraes shear zone.]()
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Hyde-Macraes shear zone
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Journal Article
Structural Setting of Gold Mineralization within the Hyde-Macraes Shear Zone, Southern New Zealand Available to Purchase
Journal: Economic Geology
Publisher: Society of Economic Geologists
Published: 01 March 2018
Economic Geology (2018) 113 (2): 347–375.
...-thick, gently dipping, Hyde-Macraes shear zone. The term “Hanging-wall” reflects the position of this shear within the current Macraes mine but not its position within the wider Hyde-Macraes shear zone, which includes numerous other mineralized shears at higher structural levels. Major km-scale zones...
FIGURES
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
Journal: Economic Geology
Publisher: Society of Economic Geologists
Published: 01 December 1990
Economic Geology (1990) 85 (8): 1711–1719.
...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...
Image
(A) Map of the Hyde-Macraes shear zone showing the extent of larger shears ... Available to Purchase
in Structural Setting of Gold Mineralization within the Hyde-Macraes Shear Zone, Southern New Zealand
> Economic Geology
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
Image
(A) Summary cross section through part of the Hyde-Macraes shear zone betwe... Available to Purchase
in Structural Setting of Gold Mineralization within the Hyde-Macraes Shear Zone, Southern New Zealand
> Economic Geology
Published: 01 March 2018
Fig. 16. (A) Summary cross section through part of the Hyde-Macraes shear zone between Innis Mills and the Eastern lodes showing the extent of haloes of mineralized schist around each shear. (B) Map showing the position of strands of the Hyde-Macraes shear zone superimposed on an image
Journal Article
Round Hill Shear Zone-Hosted Gold Deposit, Macraes Flat, Otago, New Zealand: Evidence of a Magmatic Ore Fluid Available to Purchase
Journal: Economic Geology
Publisher: Society of Economic Geologists
Published: 01 August 2000
Economic Geology (2000) 95 (5): 1025–1048.
...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...
FIGURES
Journal Article
Geochemical signatures of mesothermal Au-mineralized late-metamorphic deformation zones, Otago Schist, New Zealand Available to Purchase
Publisher: Geological Society of London
Published: 01 August 2007
Geochemistry: Exploration, Environment, Analysis (2007) 7 (3): 225–232.
..., and mineralized rocks are only subtly different from unmineralized rocks. Most Au in the shear zones is associated with sulphide minerals (pyrite and arsenopyrite) disseminated through the host schist or along microshears. Minor enrichment of Sb, Mo and Bi (ppm level) is detectable in the Hyde-Macraes Shear Zone...
FIGURES
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
Journal: Economic Geology
Publisher: Society of Economic Geologists
Published: 01 November 2018
Economic Geology (2018) 113 (7): 1571–1586.
..., 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...
FIGURES
Includes: Supplemental Content
Image
Cross-sections through the OSB, showing the basement structure in relation ... Available to Purchase
in Contrasting geochemistry of orogenic gold deposits in Yukon, Canada and Otago, New Zealand
> Geochemistry: Exploration, Environment, Analysis
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
Image
F ig . 1. A. Inset shows location of the Macraes Flat area and the Hyde-Mac... Available to Purchase
in Round Hill Shear Zone-Hosted Gold Deposit, Macraes Flat, Otago,
New Zealand: Evidence of a Magmatic Ore Fluid
> Economic Geology
Published: 01 August 2000
F ig . 1. A. Inset shows location of the Macraes Flat area and the Hyde-Macraes
shear zone (HMSZ) within the Otago Schist of central Otago, South Island, New
Zealand. The stripe pattern outlines the outcropping Median batholith ( Mortimer et al., 1999 ). Also shown are the Benmore Dam and Cromwell
Image
(A) Map of the central core of the Macraes mine showing the location of maj... Available to Purchase
in Structural Setting of Gold Mineralization within the Hyde-Macraes Shear Zone, Southern New Zealand
> Economic Geology
Published: 01 March 2018
Fig. 2. (A) Map of the central core of the Macraes mine showing the location of major workings, important structures, and the position of the main highway. Approximately half of the gold discovered within the Hyde-Macraes shear zone is located in the Frasers area, a further 25% at Round Hill
Image
General location and regional tectonic map of the Otago Schist belt, South ... Available to Purchase
in 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
> Economic Geology
Published: 01 June 2010
F ig . 1. General location and regional tectonic map of the Otago Schist belt, South Island, New Zealand, showing locations of gold-bearing mineral occurrences. HMSZ = Hyde-Macraes shear zone; RSSZ = Rise and Shine shear zone (modified from Craw et al., 2006a ).
Image
Geological map of the OSB, with principal structural/metamorphic domains (a... Available to Purchase
in Contrasting geochemistry of orogenic gold deposits in Yukon, Canada and Otago, New Zealand
> Geochemistry: Exploration, Environment, Analysis
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
Image
The Otago and Alpine Schists, South Island, New Zealand, forming the Torles... Available to Purchase
in Detecting hydrothermal graphite deposition during metamorphism and gold mineralization
> Journal of the Geological Society
Published: 01 May 2005
. Sample localities are shown, including the Macraes gold mine and the NW–SE-striking Hyde–Macraes Shear Zone (HMSZ). GS, greenschist.
Image
Map of the Otago region showing the different terranes, extent of regional ... Available to Purchase
in 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
> Economic Geology
Published: 01 November 2018
Fig. 1. Map of the Otago region showing the different terranes, extent of regional metamorphism, and mineralized lodes in the region. HMSZ = Hyde-Macraes shear zone, RSSZ = Rise and Shine shear zone. Bottom left inset: Glenorchy region with the four lodes sampled from Mt. Judah. Over 12 W lodes
Image
Geological map of the Otago and Alpine schists, South Island, New Zealand, ... Available to Purchase
in SULFIDE EVOLUTION DURING PROGRADE METAMORPHISM OF THE OTAGO AND ALPINE SCHISTS, NEW ZEALAND
> The Canadian Mineralogist
Published: 01 October 2010
Macraes Shear Zone, DMOB: Dun Mountain Ophiolite Belt.
Image
Geologic map of the Otago and Alpine schists, South Island, New Zealand, sh... Available to Purchase
in Sources of Metals and Fluids in Orogenic Gold Deposits: Insights from the Otago and Alpine Schists, New Zealand
> Economic Geology
Published: 01 December 2006
Macraes shear zone. Modified from Mortimer, (2000) .
Image
Geologic map of the Otago and Alpine schists, South Island, New Zealand, sh... Available to Purchase
in Sources of Metals and Fluids in Orogenic Gold Deposits: Insights from the Otago and Alpine Schists, New Zealand
> Economic Geology
Published: 01 December 2006
that host the deposits are also included. Abbreviations: DMOB = Dun Mountain ophiolite belt, HMSZ = Hyde Macraes shear zone, R = reverse fault. Modified from Paterson (1986) and Mortimer (2000) .
Image
A. Schematic cross section through Otago during the first mineralization ev... Available to Purchase
in 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
> Economic Geology
Published: 01 November 2018
Macraes shear zone (HMSZ) deposits. The Rakaia-Aspiring boundary has been simplified. Depths of emplacement for mineral deposits and brittle ductile transition (BDT) are from Mortensen et al. (2010b) . B. Cross section of the second mineralization event (~105 Ma) after uplift and erosion showing
Image
Average 87 Sr/ 86 Sr isotope composition of scheelite for the deposits for... Available to Purchase
in 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
> Economic Geology
Published: 01 November 2018
within each terrane as evaluated as the graphical mode from plotted data. HMSZ = Hyde-Macraes shear zone.
Journal Article
Detecting hydrothermal graphite deposition during metamorphism and gold mineralization Available to Purchase
Journal: Journal of the Geological Society
Publisher: Geological Society of London
Published: 01 May 2005
Journal of the Geological Society (2005) 162 (3): 429–432.
.... Sample localities are shown, including the Macraes gold mine and the NW–SE-striking Hyde–Macraes Shear Zone (HMSZ). GS, greenschist. ...
FIGURES
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