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Papua New Guinea
Kainantu Stage 3 Expansion Project (Kainantu)

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 Location:
140 km NW from Lae, Papua New Guinea
  Project Contacts:
PO Box 1290 Morobe Province
Lae
Papua New Guinea
411
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News
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Overview

StageFeasibility
Mine TypeUnderground
Commodities
  • Gold
  • Copper
  • Silver
Mining Method
  • Longhole stoping
  • Avoca
  • Paste backfill
Mine Life4 years (as of Jan 1, 2022)
Kainantu Stage 3 Expansion involves a new standalone 1.2 mtpa process plant and supporting infrastructure constructed with mining focused on the Kora Central Zone within the Kora Deposit and Judd Deposit.

Kainantu Stage 4 Expansion involves two standalone process plants, larger surface infrastructure and mining throughputs achieved through mining Kora Upper, Lower, and Central Zones within the Kora Deposit, and the Judd Deposit (the alternate PEA Case).

Stage 3 and 4 expansions were subsequently approved for execution by Board of Directors in December 2022, with the award of the long-lead items and the EPC contract to GR Engineering Services Limited.
Latest NewsGR Engineering receives LoI for EPC process plant build at K92’s Kainantu gold mine.     July 25, 2023

Owners

Source: p. 9,147
CompanyInterestOwnership
K92 Holdings International Limited 100 % Indirect
The Project is 100% owned by K92 Mining Limited (K92ML) (formerly Barrick (Kainantu) Limited); a company incorporated in Papua New Guinea, which is 100% owned by K92 Holdings (PNG) Limited (K92PNG), a 100% owned subsidiary of K92 Holdings International Limited (K92 Holdings).

Contractors

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Deposit Type

  • Porphyry
  • Vein / narrow vein
  • Epithermal
  • Intrusion related

Summary:

Dominant host rock of the Kora Consolidated-Irumafimpa vein systems is the highly sheared and deformed Bena Bena formation, composed of low grade metamorphosed phyllites and amphibolites, intruded by the Elandora porphyry at the northwest end of the vein system. Mineralisation on the property includes gold, silver, and copper in low sulphidation epithermal Au-telluride veins (Irumafimpa), Au-Cu-Ag quartz-sulphide veins of Intrusion Related Gold Copper (‘IRGC’) affinity at Kora Consolidated, indications of porphyry Cu Au systems (Blue Lake) and alluvial gold.

The Kora Consolidated-Irumafimpa mineral zone occurs in the centre of a large mineralised system, approximately 5 km x 5 km in area, that has been subject to drilling in parts and comprises several individual zones of vein and porphyry-style mineralisation. The Kora Consolidated-Irumafimpa (including Kora, Eutompi and Kora North) vein deposits have been demonstrated from drilling results and underground development to be a continuous mineralised structural system.

The Kora Consolidated mineral zone comprises a K1 footwall lode and a K2 hanging wall lode separated by varying widths of 0 to 15 m. In parts there is interstitial mineralisation between K1 and K2 known as the Kora Link lode and about 90 to 150 m to the east lies the parallel Judd lode. The Judd lode (J1) as well as J2 to J4 mineralised zones appear to be a vein system similar to the Kora Consolidated zone, but as yet has not been fully def ........

Mining Methods

  • Longhole stoping
  • Avoca
  • Paste backfill

Summary:

The Stage 3 Expansion mine plan considered in the DFS is designed as an incline access operation with a series of ore passes for efficient material movement between sublevels and the twin incline for material transport to surface. The DFS mine plan initially employs a long hole open stoping mining method utilizing Avoca and modified Avoca mining methods, which are currently employed at the mine. Upon construction of the paste fill plant, the mining method transitions to long hole open stoping with paste fill in Q2 2024.

Long hole open stoping has been successfully executed at both the Kora and Judd deposits, with the first long hole stope mined in Q1 2020 at Kora and Q4 2021 at Judd. The Avoca methods involve backfilling from the overcut sublevel while the long hole stope is advanced from the undercut sublevel to limit the strike length of the open stope. By limiting the strike length of the open stope, the method is designed to maintain stability of the stope walls and backs and increase the ultimate strike length extracted. The application of cemented paste fill provides improved geotechnical conditions for less dilution and higher mining recovery factors, greater operating flexibility through the ability to mine above and below paste fill and a reduction in surface tailings.

Stope shapes with uneconomic development access requirements were excluded. Dilution was estimated based on a 0.5 m dilution skin for both the footwall and hanging wall using the ........

Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

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Projected Production:

CommodityProductUnitsAvg. AnnualLOM
Gold Metal in conc./ doré koz 224799
Copper Metal in concentrate M lbs  ......  Subscription required  ......  Subscription required
Silver Metal in concentrate koz  ......  Subscription required  ......  Subscription required
Gold Equivalent Metal in conc./ doré koz  ......  Subscription required  ......  Subscription required

Operational Metrics:

Metrics
Annual ore mining rate  ......  Subscription required
Annual processing capacity  ......  Subscription required
* According to 2022 study.
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Reserves at January 20, 2022:
The Mineral Reserves cut-off grade of 3.0 g/t AuEq was used to define stoping blocks.
The updated Global Mineral Resource using a 1.75 g/t gold cut-off grade.

CategoryTonnage CommodityGradeContained Metal
Proven & Probable 6.15 Mt Gold 6.65 g/t 1.32 M oz
Proven & Probable 6.15 Mt Copper 0.88 % 54.39 kt
Proven & Probable 6.15 Mt Silver 17.53 g/t 3.47 M oz
Proven & Probable 6.15 Mt Gold Equivalent 8.39 g/t 1.66 M oz
Measured & Indicated 7.6 Mt Gold 7.72 g/t 1.9 M oz
Measured & Indicated 7.6 Mt Copper 0.91 % 69.2 kt
Measured & Indicated 7.6 Mt Silver 18.3 g/t 4.5 M oz
Measured & Indicated 7.6 Mt Gold Equivalent 9.29 g/t 2.3 M oz
Inferred 9.1 Mt Gold 6.8 g/t 2 M oz
Inferred 9.1 Mt Copper 1.32 % 119.9 kt
Inferred 9.1 Mt Silver 25.5 g/t 7.4 M oz
Inferred 9.1 Mt Gold Equivalent 9.05 g/t 2.6 M oz

Commodity Production Costs:

CommodityUnitsAverage
Total cash costs Gold Equivalent USD  ......  Subscription required
Total cash costs Gold USD  ......  Subscription required
All-in sustaining costs (AISC) Gold Equivalent USD  ......  Subscription required
All-in sustaining costs (AISC) Gold 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.
† Net of By-Product.
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Operating Costs:

Units2022
UG mining costs ($/t milled) USD 62 *  
Processing costs ($/t milled) USD  ......  Subscription required
G&A ($/t milled) USD  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required
* According to 2022 study.
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Water Supply
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Proposed Heavy Mobile Equipment as of January 1, 2022:
HME TypeModelQuantity
Concrete sprayer ....................... Subscription required ....................... Subscription required
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Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Sep 4, 2023
....................... Subscription required ....................... Subscription required Subscription required Jan 1, 2022
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....................... Subscription required ....................... Subscription required Subscription required Sep 4, 2023
Subscription required - Subscription is required.

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2023
Press Release 2023
Feasibility Study Report 2022
Management Discussion & Analysis 2022
Press Release 2022
Sustainability Report 2022
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
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News:

NewsDate
GR Engineering receives LoI for EPC process plant build at K92’s Kainantu gold mine. July 25, 2023

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