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Australia
Minari Dome Project

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 Location:
393 km SE from Port Hedland, Western Australia, Australia

  Project Contacts:
Level 2/16 Ord Street
PO Box 795, 6872
West Perth
Western Australia, Australia
6005
Phone  ...  Subscription required
EmailEmail
WebsiteWeb
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Overview

StagePreliminary Economic Assessment
Mine TypeOpen Pit & Underground
Commodities
  • Gold
  • Silver
  • Copper
  • Cobalt
Mining Method
  • Truck & Shovel / Loader
  • Sub-level caving
  • Longhole open stoping
Mine Life8 years (as of Jan 1, 2022)
Aggressive growth drilling programme at Minyari Dome commenced in June and running through H1 CY2023; updated resource expected Q3 CY2023 and to be incorporated into PFS.


Owners

Source: p. 36
CompanyInterestOwnership
Antipa Minerals Ltd, 100 % Indirect
Minyari Dome Project is 100%-owned by Antipa Minerals Ltd.

Contractors

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Deposit Type

  • Intrusion related
  • Breccia pipe / Stockwork


Summary:

Mineralisation at both Minyari and WACA is hosted predominantly within hydrothermally altered metasediments. There are several mafic bodies identified in the project area, predominantly dolerite, which are variably mineralised, along with late felsic intrusive dykes that cross-cut the deposit area and are generally unmineralised. The resource has been depleted in these lithologies. The Proterozoic rocks are overlain by transported overburden, typically desert/dune aeolian sand which varies in thickness up to 10 metres. The Minyari and WACA deposits precious (gold and silver) and/or base metal (copper and cobalt) mineralisation is interpreted to be reduced intrusion-related, with local controls on mineralisation related to variations in both the competency/hardness and chemical composition of rock units, in combination with other discrete structural controls such folding, faulting, fracturing, veining, brecciation and associated hydrothermal alteration and mineralisation (including sulphides) being the key factors influencing mineralisation grade and continuity. The Minyari deposit constitutes approximately 85% of the gold resource and 96% of the Scoping Study mining inventory gold ounces. Minyari mineralisation is generally moderate to steeply dipping and is hosted by a plunging pipe-like breccia body located in the hinge and both limbs of an interpreted synform. The true-thickness of mineralisation ranges from 5 to 120m and extends from surface to a depth of 670m and remai ........


Mining Methods

  • Truck & Shovel / Loader
  • Sub-level caving
  • Longhole open stoping


Summary:

Mining of the Project has been assumed to be by a combination of open pit and underground methods. The open pit mine life is currently projected to be approximately mined in conjunction with underground operations. The selected mining method, design and extraction sequence are tailored to suit orebody characteristics, minimise dilution and ore loss, utilise planned process plant capacity and expedite free cash generation in a safe manner. Mining schedules have been based on realistic mining productivities with readily achievable mining rates along with consistent material movements.

Contractor mining will be undertaken from three open pits using standard truck and shovel mining methods with the Minyari deposit accounting for 90% of the open pit gold mining production. The open pit lower economic cut-off grade was determined to be 0.30 g/t.

Contractor mining will also be undertaken for the Minyari deposit underground using Modified Sub-Level Caving (M-SLC) mining methods. The Minyari South open pit will also act as the box-cut for the Minyari deposit underground portal and decline. The Minyari underground lower economic cut-off grade was determined to be 1.50 g/t. Based on the conceptual underground mine design the decline is also an optimal drill platform for delineating and accessing underground resource growth and mining opportunities including the Minyari and WACA plunge targets, Minyari South and Sundown.

Open pit sequencing using two pit ........


Crushing and Grinding
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Processing

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Summary:

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Projected Production:

CommodityUnitsAvg. AnnualLOM
Gold koz 122975
Silver koz  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in doré.

Operational Metrics:

Metrics
Annual processing capacity  ......  Subscription required
Waste tonnes, LOM  ......  Subscription required
Ore tonnes mined, LOM  ......  Subscription required
Total tonnes mined, LOM  ......  Subscription required
Tonnes processed, LOM  ......  Subscription required
* According to 2022 study.
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Reserves at May 2, 2022:
Mineral Resources are based on 0.5 g/t and 1.5 g/t gold equivalent1 cut-offs.

CategoryTonnage CommodityGradeContained Metal
Total Resource 33,900,000 t Gold 1.6 g/t 1,750,000 oz
Total Resource 33,900,000 t Silver 0.54 g/t 584,000 oz
Total Resource 33,900,000 t Copper 0.19 % 64,300 t
Total Resource 33,900,000 t Cobalt 0.03 % 11,100 t

Commodity Production Costs:

CommodityUnitsAverage
All-in sustaining costs (AISC) Gold USD  ......  Subscription required
All-in costs Gold USD  ......  Subscription required
Assumed price Cobalt USD  ......  Subscription required
Assumed price Copper USD  ......  Subscription required
Assumed price Silver USD  ......  Subscription required
Assumed price Gold USD  ......  Subscription required
* According to 2022 study / presentation.
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Operating Costs:

Units2022
OP mining costs ($/t mined) AUD 25.3 *  
UG mining costs ($/t mined) AUD  ......  Subscription required
Processing costs ($/t milled) AUD  ......  Subscription required
G&A ($/t milled) AUD  ......  Subscription required
Total operating costs ($/t milled) AUD  ......  Subscription required
* According to 2022 study.
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2022 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Pre-Production capital costs $M AUD  ......  Subscription required
Sustaining CapEx $M AUD  ......  Subscription required
OP OpEx $M AUD  ......  Subscription required
UG OpEx $M AUD  ......  Subscription required
Processing OpEx $M AUD 410
Total OpEx $M AUD  ......  Subscription required
Gross revenue (LOM) $M AUD  ......  Subscription required
Pre-tax Cash Flow (LOM) $M AUD  ......  Subscription required
After-tax Cash Flow (LOM) $M AUD  ......  Subscription required
Pre-tax NPV @ 7% $M AUD  ......  Subscription required
After-tax NPV @ 7% $M AUD  ......  Subscription required
Pre-tax IRR, %  ......  Subscription required
After-tax IRR, %  ......  Subscription required
Pre-tax payback period, years  ......  Subscription required
After-tax payback period, years  ......  Subscription required
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Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Mar 3, 2023
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Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2023
Preliminary Economic Assessment 2022
Year-end Mineral Reserves 2022
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