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New Zealand
Macraes Mine (Macraes Operation)

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 Location:
55 km N from Dunedin, New Zealand

  Address:
Golden Point Road, RD3, Macraes Flat 9483, East Otago
Macraes
New Zealand
9483
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WebsiteWeb
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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
Production Start...


Owners

Source: p. 10,27
CompanyInterestOwnership
OceanaGold Corp. 100 % Indirect
Oceana Gold Limited holds 100% interests in the Macraes open pit and is a wholly owned subsidiary of OceanaGold Corp.

Contractors

Subscription required - Subscription is required.


Deposit Type

  • Orogenic
  • Vein / narrow vein
  • Breccia pipe / Stockwork


Summary:

The Coronation and Coronation North deposits are located 5 to 6 km to the northeast of the processing plant. Coronation consists of a 15 to 20 degrees dipping hangingwall shear that is between 3 and 10 metres thick. Immediately beneath (1 to 10 metres) the hangingwall shear is a thinner lode structure that parallels hangingwall. Unlike deposits to the south, there is very little development of stockwork mineralisation beneath the hangingwall. Mineralogically, the Coronation deposit is very similar to previously mined deposits to the south. Located 1km to the north of Coronation is the Coronation North deposit which was discovered in 2015. Coronation North differs from most of the previously mined ore bodies along the HMSZ. Pit mapping and grade control data have delineated a left-hand lateral bend in the strike of the HWS coincident with a high-grade zone of mineralisation that plunges to the ENE. Traversing along the shear from southeast to northwest the dip of the HWS gradually decreases whereas the strike bends towards the west. This bend coincides with a zone of steeply dipping en-echelon style mineralised splays beneath the HWS, whose dip steepens to near vertical as they approach the FWF. Zones of finely laminated mineralised quartz veins also form beneath this WSW-striking segment of the HWS, perpendicular to its strike. Compared to the other deposits in the goldfield, the WSW-strike of Coronation North, the relatively narrow approximately 100m width of the mineralised ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

Conventional open cut bench mining methods are used at the Macraes Goldfield. Pits are excavated on level benches 2.5m high within the ore zone (approx. 2.8m high after blasting) and 4m high within the waste zone.

Hydraulic backhoe excavators in the 250t and 360t class are used for mining ore and waste. Ore is mined with different techniques depending on the style of mineralisation.
- Hanging wall lode ore is mined by first removing the hanging-wall waste with an excavator under visual control of a geological technician, then mining the exposed ore. Footwall ore is selectively removed from the underlying footwall waste if it can be visually controlled, otherwise the footwall ore is diluted with the wedge of underlying waste; and
- Stockwork ore is generally mined within the defined ore blocks. Ore blocks are defined with the guidance from a conditionally simulated grade control model.

With this mining method and equipment, the smallest selective mining unit (SMU) used when defining ore blocks is 4m by 4m by 2.5m high (approximately 100t), but blocks are generally a minimum of 500t to minimise dilution.

Mining to date at Macraes has come from thirteen pits comprising (from north to south), Coronation North, Coronation, Deepdell North, Deepdell South, Golden Point, Northwest Pit, Round Hill, Southern Pit, Innes Mills, Innes Mills West, Frasers, Golden Ridge and Golden Bar. Current operations are based in Coronation North, Deepdell Nort ........


Crushing and Grinding
Flow Sheet: Source

The plant's crushing and grinding comprises the following components and stages:

- Two single stage jaw crushing circuits, which reduce the ore to a top size of approximately 200mm; the products from these two circuits are directly fed to the two SAG mills and an emergency feeder on the conveyor system feeding the higher capacity circuit provides continuity of feed to the grinding circuit if the jaw crusher feed is interrupted;

- A complex grinding circuit to reduce the particle size of the ore to 80% passing at 130 µm; the original, higher capacity crushing circuit feeds a 2,300kW SAG mill and the new crushing circuit feeds a 1,500kW SAG mill; discharge from the two SAG mills is combined with the discharge from one of the two ball mills (2,300kW) and directed to the primary cyclone cluster. Discharge from the higher capacity ball mill (2,500kW) is fed to the secondary cyclone cluster. The underflows from both cyclone clusters are combined and fed in parallel to the flash flotation circuit and two ball mills (2,300kW and 2,500kW);

- Regrind of the flotation concentrate is performed in a 900kW ball mill to 80% passing of 15 µm to improve pressure oxidation kinetics.


Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Combined production numbers are reported under Macraes Operation

Operational Metrics:

Metrics202120202019201820172016
Ore tonnes mined  ......  Subscription required  ......  Subscription required5,462 kt
Waste  ......  Subscription required  ......  Subscription required45,163 kt38,613 kt37,070 kt27,053 kt
Subscription required - Subscription is required.

Reserves at December 31, 2021:
The Mineral Reserves reported a 0.4 g/t Au cut-off.

The Mineral Resource reported using a 0.3 g/t Au cut-off.

CategoryTonnage CommodityGradeContained Metal
Proven 15.6 Mt Gold 0.87 g/t
Probable 19.9 Mt Gold 0.85 g/t
Proven & Probable 35.5 Mt Gold 0.86 g/t 0.98 M oz
Measured 21.7 Mt Gold 0.88 g/t
Indicated 56 Mt Gold 0.75 g/t
Measured & Indicated 77.7 Mt Gold 0.79 g/t 1.96 M oz
Inferred 24 Mt Gold 0.7 g/t 0.5 M oz

Operating Costs:

Units202120202019201820172016
OP mining costs ($/t mined) USD 1.331.131.211.31.31.81



Heavy Mobile Equipment as of June 30, 2020:
HME TypeModelSizeQuantityStatusLeased or
Contractor
Dozer (crawler) ....................... Subscription required ....................... Subscription required Existing Leased
Dozer (rubber tire) ....................... Subscription required ....................... Subscription required Existing Leased
Drill ....................... Subscription required ....................... Subscription required Existing Leased
Drill ....................... Subscription required ....................... Subscription required Existing Leased
Excavator ....................... Subscription required 22 cu. m ....................... Subscription required Existing Leased
Excavator ....................... Subscription required 15 cu. m ....................... Subscription required Existing Leased
Grader ....................... Subscription required ....................... Subscription required Existing Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed Leased
Loader ....................... Subscription required ....................... Subscription required Existing Leased
Loader ....................... Subscription required ....................... Subscription required Existing Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed Leased
Truck (dump) ....................... Subscription required ....................... Subscription required Existing Leased
Truck (water) ....................... Subscription required ....................... Subscription required Existing Leased
Truck (water) ....................... Subscription required ....................... Subscription required Existing Leased
Truck (water) ....................... Subscription required ....................... Subscription required Existing Leased
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required May 10, 2022
....................... Subscription required ....................... Subscription required Subscription required May 10, 2022
....................... Subscription required ....................... Subscription required Subscription required Sep 13, 2022
Subscription required - Subscription is required.

Staff:

EmployeesYear
Subscription required 2018
Subscription required 2017

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Corporate Presentation 2018
Press Release 2018
Year-end Mineral Reserves 2018
Corporate Presentation 2017
Corporate Presentation 2017
Annual Information Form 2016
Technical Report 2010
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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