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New Zealand
Waihi District - Marhta Project

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 Location:
2 km N from Waihi, New Zealand

  Project Contacts:
43 Moresby Avenue
Waihi
South Australia, New Zealand
3610
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Overview

StatusArchived
Mine TypeUnderground
Commodities
  • Gold
  • Silver
Mining Method
  • Pillar mining
  • Truck & Shovel / Loader
  • Avoca
  • Cemented backfill
Mine Life2028
2021 Feasibility Study is related to the producing Martha mine at Waihi Operation


Owners

Source: p. 57
CompanyInterestOwnership
OceanaGold Corp. 100 % Indirect
The Waihi District Projects, 100% owned by wholly owned subsidiary OceanaGold (New Zealand) Limited

Contractors

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Deposit Type

  • Epithermal
  • Vein / narrow vein


Summary:

The Waihi vein system is hosted within andesitic flows and pyroclastic units of the late Miocene (7.36-6.76Ma) Waipupu Formation. The Waipupu Formation in Waihi can be subdivided into an upper quartzphenocryst poor unit and a lower quartz-phenocryst rich unit which dip shallowly towards the SE. Some of the veining and gold mineralisation in Waihi appears to be better developed within the lower quartz-rich andesite flows, with the exception of the Favona, Moonlight and GOP deposits which are solely hosted within the upper andesite unit. Much of the mineralised andesites in Waihi are overlain by post-mineral rocks including dacite flows of the Uretara Formation (5.23Ma), Pleistocene ignimbrites and recent ash deposits.

Where veining is exposed close to the surface, the quartz-adularia altered andesites form resistant paleotopo ‘highs’ that project through the post-mineral cover sequences.

Martha Vein System
The Martha Vein System is the largest and most documented of the vein networks in Waihi. The veins are numerous and form a large network that extends for more than 1600m along strike and 600m below the surface. The vein network although complex in detail, simply comprises the dominant southeast-dipping Martha vein and several northwest-dipping hangingwall splays including the Empire, Welcome, Royal and Rex veins. The Martha vein is the largest vein structure reaching up to 30m in thickness in places but averages 6 to 15m wide. Increased vein widths ........


Mining Methods

  • Pillar mining
  • Truck & Shovel / Loader
  • Avoca
  • Cemented backfill


Summary:

Permits and consents have been granted for MUG project and all selected mining methods are in accordance with the license, permit and consent conditions, principally related to placement of backfill, blast vibration limits, method of working and hydrogeological controls. Exploration drives were completed on 800 m RL and 920 m RL in 2018. Development of MUG commenced in mid-2019 and 2,169 m of lateral development and a 120 m ventilation raise were completed by the end of 2019.

The Martha underground is accessed via the existing Favona portal through the existing Trio and Correnso workings and shares the ventilation development and shafts as well as the Correnso workshop, Trio cribroom and dewatering systems. Exploration drives were completed on 800 m RL and 920 m RL in 2018.

Development of Martha underground commenced in mid-2019 and 2,169 m of lateral development and a 120 m ventilation raise were completed by the end of 2019 and a further 7,554 m of lateral development completed in 2020. Two breakthrough openings into the pit for ventilation and escape were also completed. Development up to end 2020 has been focussed on ramp accesses for Edward, Empire, Rex and Royal mine zones, ventilation connections, pumping well access drives, drilling platforms and back fill drives as well as the breakthroughs into the pit.

Four mining methods are proposed for the mine:
1. Modified Avoca with rockfill in previously unmined areas.
2. Modified Av ........


Crushing and Grinding
Source: Subscription required

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Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Projected Production:

CommodityUnitsLOM
Gold oz 589
Silver oz  ......  Subscription required
All production numbers are expressed as metal in doré.

Operational Metrics:

Metrics
Waste tonnes, LOM  ......  Subscription required
Ore tonnes mined, LOM  ......  Subscription required
Total tonnes mined, LOM  ......  Subscription required
Tonnes processed  ......  Subscription required
Annual ore mining rate  ......  Subscription required
* According to 2021 study.
Subscription required - Subscription is required.

Reserves at December 31, 2021:
Martha Phase 5 (MOP5) and Gladstone (GOP) open pit resources are signs based on cut-off grades of 0.5g/t and 0.56g/t respectively.

Martha underground Mineral Resource is reported below the conceptual Martha Phase 5 open pit cutback design and is reported to a 2.15 g/t cut-off.

The WKP Resource is constrained within a conceptual underground design - based upon the incremental cut-off grade of 2.5 g/t Au.

CategoryOreTypeTonnage CommodityGradeContained Metal
Probable In-Situ (UG) 4.77 Mt Gold 4.2 g/t 0.64 M oz
Probable In-Situ (UG) 4.77 Mt Silver 14.5 g/t 2.23 M oz
Indicated In-Situ (OP) 6.6 Mt Gold 1.86 g/t 0.4 M oz
Indicated In-Situ (UG) 7.33 Mt Gold 7.44 g/t 1.76 M oz
Indicated Total 13.93 Mt Gold 4.8 g/t 2.15 M oz
Indicated In-Situ (OP) 6.6 Mt Silver 13.6 g/t 2.89 M oz
Indicated In-Situ (UG) 7.33 Mt Silver 21.1 g/t 4.99 M oz
Indicated Total 13.93 Mt Silver 17.6 g/t 7.87 M oz
Inferred In-Situ (OP) 5.4 Mt Gold 1.8 g/t 0.31 M oz
Inferred In-Situ (UG) 5.15 Mt Gold 7.02 g/t 1.17 M oz
Inferred Total 10.58 Mt Gold 4.35 g/t 1.5 M oz
Inferred In-Situ (OP) 5.4 Mt Silver 17 g/t 3 M oz
Inferred In-Situ (UG) 5.15 Mt Silver 21.8 g/t 3.62 M oz
Inferred Total 10.58 Mt Silver 19.3 g/t 6.57 M oz

Commodity Production Costs:

CommodityUnitsAverage
All-in sustaining costs (AISC) Gold USD  ......  Subscription required&nbs
C1 cash costs Gold USD  ......  Subscription required&nbs
Assumed price Gold USD  ......  Subscription required&nbs
* According to 2021 study / presentation.
Subscription required - Subscription is required.

Operating Costs:

Units2021
UG mining costs ($/t milled) USD 62.1 *
Processing costs ($/t milled) USD  ......  Subscription required
G&A ($/t milled) USD  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required
* According to 2021 study.
Subscription required - Subscription is required.

2021 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Initial CapEx $M USD  ......  Subscription required
Sustaining CapEx $M USD  ......  Subscription required
Total CapEx $M USD  ......  Subscription required
UG OpEx $M USD  ......  Subscription required
Processing OpEx $M USD 134.3
G&A costs $M USD 80.1
Total OpEx $M USD  ......  Subscription required
Income Taxes $M USD  ......  Subscription required
Royalty payments $M USD  ......  Subscription required
Gross revenue (LOM) $M USD  ......  Subscription required
Pre-tax Cash Flow (LOM) $M USD  ......  Subscription required
After-tax Cash Flow (LOM) $M USD  ......  Subscription required
Pre-tax NPV @ 5% $M USD  ......  Subscription required
After-tax NPV @ 5% $M USD  ......  Subscription required
Pre-tax IRR, %  ......  Subscription required
After-tax IRR, %  ......  Subscription required
Pre-tax payback period, years  ......  Subscription required
Subscription required - Subscription is required.


Heavy Mobile Equipment as of March 31, 2021:
HME TypeModelQuantityStatus
Drill (long hole) ....................... Subscription required ....................... Subscription required Proposed
Drill (long hole) ....................... Subscription required Existing
Drill jumbo (two boom) ....................... Subscription required ....................... Subscription required Existing
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed
Loader ....................... Subscription required ....................... Subscription required Existing
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed
....................... Subscription required ....................... Subscription required Proposed
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed
Truck (underground) ....................... Subscription required ....................... Subscription required Existing
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Feb 3, 2023
....................... Subscription required ....................... Subscription required Subscription required Feb 3, 2023
....................... Subscription required ....................... Subscription required Subscription required Feb 3, 2023
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2021

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2023
Year-end Mineral Reserves 2022
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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