Mining Intelligence and News
Australia

Jervois Project

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Overview

Mine TypeOpen Pit & Underground
StagePermitting
Commodities
  • Copper
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
  • Sub-level open stoping (SLOS)
  • Longhole stoping
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SnapshotThe Jervois Project is a high-grade polymetallic project in Australia with substantial silver and gold by-products adding to its financial attractiveness.

KGL continues to explore and target near-mine extensions along strike and at depth for Reward and Rockface in addition to near surface targets, that hold the potential to add substantial value for shareholders. The Jervois and Unca Creek deposits remain under-explored and possess significant potential for more highgrade copper, gold, and silver, as evidenced by recent successful drilling at Rockface Deeps, which yielded some of the highest grades of polymetallic mineralisation ever encountered at Jervois.

The Feasibility Study Update is nearing completion, with project capital updated and processing parameters reviewed. The mine design (Open cut and Underground), scheduling and civil works, have been reviewed and updated by separate Tier 1 contractors. Operating cost reviews are ongoing.

Owners

SourceSource
CompanyInterestOwnership
Jervois Operations Pty Ltd. (operator) 100 % Indirect
KGL Resources Limited 100 % Indirect
The Jervois Project is within EL25429 and EL28082, 100% owned by Jinka Minerals and operated by Jervois Operations Pty Ltd, both wholly owned subsidiaries of KGL Resources Limited.

Contractors

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Deposit type

  • Stratabound
  • Breccia pipe / Stockwork

Summary:

The copper resources considered for development of the Jervois Project on behalf of KGL Resources Limited comprise Reward, Rockface and Bellbird deposits.

Reward is interpreted as an original syn-depositional copper-rich polymetallic massive sulphide deposit that has undergone deformation, metamorphism and some degree of structural remobilisation. Recent modelling of mineralisation by KGL geologists strongly supports the interpretation of a low-grade, broadly stratabound zone, overprinted by higher grade ‘shoots’ that represent structural remobilisation into fold hinges and breccia style structures.

Interpretation of higher-grade zones is based primarily on geological logging supported by abrupt changes in copper and/or silver grades. High grade structural shoots are characterised by coarser grained sulphides and magnetite sulphide breccia. The lower grade stratabound halo was defined as greater than 0.5% sulphur. Intervals encompassing high grade shoots and stratabound mineralisation were modelled using Leapfrog software with an anisotropic component conforming to the plunge of measured F2 fold hinges.

The tenement is located mainly within the Palaeo-Proterozoic Bonya Schist on the north-eastern boundary of the Arunta Orogenic Domain. The Arunta Orogenic Domain in the northwestern part of the tenement is overlain unconformably by Neo-Proterozoic sediments of the Georgina Basin.

The stratabound mineralisation for the project consists of a series of complex, narrow, structurally controlled, subvertical sulphide/magnetite-rich deposits hosted by Proterozoic-aged, amphibolite grade metamorphosed sediments of the Arunta Inlier.

Mineralisation is characterised by veinlets and disseminations of chalcopyrite in association with magnetite. In the oxide zone, which is vertically limited, malachite, azurite and chalcocite are the main Cu minerals.

Dimensions
The Reward deposits strike over 1.5 km. Within the structural corridor lie five high grade shoots, each approximately 200 m in length and plunging steeply south up to 800 m below the surface. Two lodes lie to the east in the footwall of the Reward structure.

The Bellbird deposits strike over 1.3 km. Within the structural corridor lie three defined lodes, ranging from approximately 200 m to 500 m in length, and plunging moderately North. Three mineralised structures lie in the hanging wall position of the main structure and two oblique lodes lie to the east of the Bellbird structure.

The Rockface deposits strike over 700 m. Within the structural corridor lie four defined lodes ranging from approximately 100 m to 250 m in length and plunging vertically over 1 km deep.

Reserves

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Mining Methods

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Comminution

Crushers and Mills

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Processing

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Production

CommodityProductUnitsAvg. AnnualLOM
Copper Metal in concentrate M lbs 54613
Copper Concentrate kt 1001,029
Gold Metal in concentrate koz 6.568
Silver Metal in concentrate koz 9459,394

Operational metrics

Metrics
Annual ore mining rate  ....  Subscribe
Annual processing capacity  ....  Subscribe
Waste tonnes, LOM  ....  Subscribe
Ore tonnes mined, LOM  ....  Subscribe
Tonnes processed, LOM  ....  Subscribe
* According to 2022 study.

Production Costs

CommodityUnitsAverage
Credits (by-product) Copper USD  ....  Subscribe
Site cash costs (produced) Copper USD  ....  Subscribe
All-in sustaining costs (AISC) Copper USD  ....  Subscribe
C1 cash costs Copper USD  ....  Subscribe
Assumed price Copper USD  ....  Subscribe
Assumed price Silver USD  ....  Subscribe
Assumed price Gold USD  ....  Subscribe
* According to 2022 study / presentation.
** Net of By-Product.

Operating Costs

CurrencyAverage
Total operating costs ($/t milled) AUD  ....  Subscribe
* According to 2022 study.

Project Costs

MetricsUnitsLOM Total
Pre-Production capital costs $M AUD  ......  Subscribe
Working capital $M AUD  ......  Subscribe
After-tax NPV @ 8% $M AUD  ......  Subscribe
After-tax IRR, %  ......  Subscribe
After-tax payback period, years  ......  Subscribe

Required Heavy Mobile Equipment

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Personnel

Mine Management

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jan 7, 2025
....................... Subscription required ....................... Subscription required Subscription required Jan 7, 2025

Total WorkforceYear
...... Subscription required 2022

Aerial view:

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