• Data Access
  • Your Email  
  • Your Email  
Keep me signed in.
Forgot your password?
Close
  • Forgot Your Password?
  • Enter the email you signed up with and we'll email it to you.
  • Your Email  
Close
Back
MDO
Mining Data Solutions
  • Home
  • Database
  • Subscribe
  • Sign In
  • Sign In
Australia
Jundee Mine

This page is not tailored to
devices with screen width under 750 px.
 Location:
46 km NE from Wiluna, Western Australia, Australia

  Regional Office:
Level 1, 388 Hay Street
PO Box 2008 Subiaco WA 6904
Subiaco
Western Australia, Australia
6008
Phone  ...  Subscription required
Fax+61-8-6188-2111
EmailEmail
WebsiteWeb
Additional Resources for Suppliers & Investors
Drill results over 30 g/t Au
Stay on top of recent discoveries.
Search drill results by commodity and grade.
Largest mines in the Americas
Mining and mill throughput capaciites.
Full profiles of select mines and projects.
Deepest underground mines
Shaft depth and mill throughput data.
Full profiles of select mines and projects.
Heavy mobile equipment
HME type, model, size and quantity.
Full profiles of select mines and projects.
Permitting and construction projects
Projects at the permitting or construction stage. Full profiles of select projects.
Mines with remote camps
Camp size, mine location and contacts.
Full profiles of select mines and projects.
Mines & projects in Australia
A list of country's mines and projects.
Full profiles of select mines and projects.
  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

Thank you for browsing through mine profiles compiled by the Mining Data Online team.

Would you like to subcribe or schedule a Demo?
  • Name:
     
  • Company:
     
  • Position:
     
  • Phone:
  • Email:
  • Message:

Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Longhole open stoping
Processing
  • Gravity separation
  • Smelting
  • Calcining
  • Agitated tank (VAT) leaching
  • Inline Leach Reactor (ILR)
  • Carbon in leach (CIL)
  • Carbon adsorption-desorption-recovery (ADR)
  • AARL elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life10 years (as of Jan 1, 2018)
Latest NewsNorthern Star on path to boost Jundee capacity     November 17, 2020


Owners & OPERATOR

Source:
CompanyInterestOwnership
Byrnecut Australia Pty Ltd. (operator)
Northern Star Resources Ltd. 100 % Direct
The underground mining and fleet maintenance is carried out by the contract underground mining company Byrnecut Australia (BAPL). Daily mine management is shared by BAPL and Northern Star personnel who form an integrated management structure to ensure that functional duplication is eliminated. BAPL are also responsible for the supply of surface mining equipment which facilitates secondary haulage, road maintenance, mill crusher feed and waste rock management operations.

Deposit Type

  • Vein / narrow vein
  • Orogenic


Summary:

The Jundee-Nimary gold is hosted within a 4km (long) and 2.5km (wide) sequence of Achaean basalts and weakly differentiated dolerite sills separated by sedimentary rocks (carbonaceous shales, cherts, and siltstone) and dacitic porphyries. Younger felsic and intermediate porphyries and dolerite dykes intrude the sequence. The mine sequence is bounded to the west by a thick succession of felsic volcanics and volcaniclastics, and mineralisation diminishes eastwards as the mafic package becomes more magnesium–rich to ultramafic in composition.

The age of the gold mineralisation is approximately 2,700 million years (Archaean), and is controlled by a series of complex brittle fractures. Over 70% of the gold is hosted within the more brittle dolerite units with the remaining 30% associated with the basalts. The field has undergone multiphase deformation – folds, thrusts, strike and oblique slip faults. The gold is hosted within narrow, discontinuous quartz +/- carbonate veins (typically <0.5m wide) which contain abundant visible gold.

Low grade mineralisation occurred with the first phase of faulting. This was followed by the emplacement of large dacitic intrusions which locked up the initial fault lines causing some abutment pressure – during the second faulting phase this abutment pressure prevented the faults from slipping as easily as before causing a “ripping” between the two fault lines fracturing the rock and causing a relatively large low pressure zone. Gold-rich fluids then flowed into these low pressure zones (main mineralization event). There is minor post mineralisation faulting which causes some minor offsets of the loads.

Alteration and sulphide mineral assemblage suggest the composition of the ore fluid was similar to other orogenic gold deposits.


Mining Methods

  • Longhole open stoping


Summary:

Prior to the commencement of underground operations and the Barton Decline in 1998, ore was sourced solely from several open pits. These open pit operations around the immediate Jundee- Nimary environ continued until 2002 when the last of the near surface material was mined. In 2003, open pit operations were recommenced approximately 30km to the south of Jundee when several small pits (Gourdis-Vause area) continued until September 2007.

Currently, all ore is sourced from Jundee underground operations, yielding ~1.8M tonnes each year. Three underground portals are in use which provide access to the various underground lode structures, namely the Barton, Gateway and Invicta portals. The Barton portal contains three active ore bodies (Nim3, Lyons and Westside) with development access well advanced in the Armada lode, whilst Invicta consists of the Invicta (remnants), Cardassian, Wilson and Deakin ore bodies. Gateway and Gringotts ore bodies are both mined via the Gateway portal, again with development access well advanced in the Revelation and Nexus lodes. Recent exploration has uncovered a new prospective mining area at depth (Zodiac), which is currently undergoing additional drilling for insight and assessment.

The mining process is a geological driven model and production intensive due to the narrow vein nature and lithology of the ore bodies. There is a necessity for controlled mining practices to minimise the amount of waste dilution incurred during the ore extraction process. In general, the ore is mined using top-down long-hole (uphole) open stope bench retreat mining. The benches are nominally 20m apart (vertically). The lode structures have a dip of between 35-70 degrees and have multiple orientations. The mining method typically extracts the ore in 30-50m panels separated by 5-10m rib pillars which remain in-situ to provide geo-mechanical stability and support. For ore structures that dip between 25.0 degrees and 35.0 degrees the ore is extracted using manual mining techniques (air-leg mining) to optimise recovery and reduce costs. Ore is hauled to the surface from the underground stope and development areas by 55 tonne articulated dump trucks.

The combination of multiple lode orientations, host lithology and complex structural geology found in the Jundee ore body is providing Northern Star with the opportunity to add new resources through a process of reviewing and testing previous geological models and assumptions. This process is supported by a large amount of information from a drilling database containing more than eight million metres of underground and surface drilling completed to date (~A$1B spent). The mine is currently developing and stoping at various depths (ranging from 150m to 800m below surface) and employs various mining methods and extraction rates depending on the ore body or area being mined.

The lode domains across the operation are geographically expansive, resulting in a complex ventilation system that includes capacity limiting cascading ventilation in lower reaches of the mines. Each of the three mines has distinct characteristics that provide challenges for ventilation. The Barton mine has four primary return air rises (RAR) each equipped with a 350kW axial fan. The Invicta mine presently has two RAR, each with a 350kW fan drawing air directly from the Invicta, Deakin and Cardassian ore bodies. At Gateway, two 450kW exhaust fans are installed underground and two large internal rises, one for return air (exhaust) and one for intake air (fresh) have been completed to extend the primary ventilation. During the warmer periods of the year, the mine utilises 3 refrigeration units to provide cooled air to the deeper extents of the mine. These units can be moved to alternative locations to maximise its impact on active work areas. Current active ventilation projects include the addition of 3 primary fan installations, with variable speed drives, across the Barton, Deakin and Gateway mines.

Contractor: Byrnecut Australia (BAPL). Dates: 2001 - 2021.

The underground mining and fleet maintenance is carried out by the contract underground mining company Byrnecut Australia (BAPL). Daily mine management is shared by BAPL and Northern Star personnel who form an integrated management structure to ensure that functional duplication is eliminated. BAPL are also responsible for the supply of surface mining equipment which facilitates secondary haulage, road maintenance, mill crusher feed and waste rock management operations.

All mine design, blast design, production geology, survey, geotechnical and mine planning is undertaken by Northern Star personnel.


Crushing and Grinding
Crusher / Mill TypeModelSizePowerQuantity
SAG mill


Processing

  • Gravity separation
  • Smelting
  • Calcining
  • Agitated tank (VAT) leaching
  • Inline Leach Reactor (ILR)
  • Carbon in leach (CIL)
  • Carbon adsorption-desorption-recovery (ADR)
  • AARL elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Source: Subscription required

Summary:

The Jundee Processing circuit is a conventional CIL plant with a hard rock processing capacity in excess of 1.8M tonnes per annum. The current blend ratio is 100% underground ore.

The crushing circuit is two-stage consisting of a C125 jaw crusher and HP6 secondary crusher closed by a double deck banana screen with a nominal 400 tonne per hour crushing capacity. The crushing circuit can operate in either full secondary crush or partial secondary crush modes to suit milling requirements. The crushing circuit feeds a reclaim stockpile with a 25,000 tonne capacity. Three variable speed belt feeders below the reclaim feeders ensure steady and controlled grinding circuit feed.

The grinding circuit comprises of two mills. The 5.5m diameter x 8.2m EGL ANI SAG mill is low aspect with a 3,850 kilowatt motor. The SAG mill normally operates in open circuit, but has the capability to be operated in closed circuit SAG only configuration. The 4.3m diameter x 6.7m EGL Nordber ........

Recoveries & Grades:

CommodityParameter20202019201820172016
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Head Grade, g/t 4.54.65.45.25.5
Subscription required - Subscription is required.

Production:

CommodityUnits20202019201820172016
Gold oz  ......  Subscription required  ......  Subscription required  ......  Subscription required233,556209,515
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics20202019201820172016
Annual processing capacity  ......  Subscription required1.35 Mt
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required1,245,354 t
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required1,290,366 t
^ Guidance / Forecast.
Subscription required - Subscription is required.

Reserves at June 30, 2020:

CategoryTonnage CommodityGradeContained Metal
Proven 2,102 kt Gold 1.4 g/t 93 koz
Probable 14,766 kt Gold 4.1 g/t 1,931 koz
Proven & Probable 16,868 kt Gold 3.7 g/t 2,024 koz
Measured 2,102 kt Gold 1.4 g/t 93 koz
Indicated 38,924 kt Gold 3.2 g/t 4,057 koz
Inferred 14,197 kt Gold 2.5 g/t 1,124 koz
Total Resource 55,224 kt Gold 3 g/t 5,274 koz

Commodity Production Costs:

CommodityUnits20202019201820172016
All-in sustaining costs (sold) Gold AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required 948 / oz 1,007 / oz
^ Guidance / Forecast.
Subscription required - Subscription is required.

Financials:

Units20202019201820172016
Revenue M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Pre-tax Income M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required
EBITDA M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required


Heavy Mobile Equipment as of December 31, 2018:
HME TypeModelQuantityLeased or
Contractor
Drill 4 Leased
Drill (long hole) 3 Leased
Explosives Charger 3 Leased
Loader ....................... Subscription required 7 Leased
Underground truck ....................... Subscription required 7 Leased
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Sep 30, 2020
....................... Subscription required ....................... Subscription required Subscription required Sep 30, 2020
....................... Subscription required ....................... Subscription required Subscription required Sep 30, 2020
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 2018
Annual Report 2017
Annual Report 2016
Fact Sheet 2014
Subscription required - Subscription is required.

News:

NewsDate
Northern Star on path to boost Jundee capacity November 17, 2020
Swick strengthens pockets with Northern Star, Perilya contracts July 30, 2020
BGC Contracting revives golden days with Northern Star contract March 7, 2019

Aerial view:

Subscription required - Subscription is required.

Terms of Use Privacy Policy © 2020 MDO Data Online Inc.