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Australia
Paulsens Mine

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 Location:
161 km NW from Paraburdoo, Western Australia, Australia

  Regional Office:
Level 1, 388 Hay Street
PO Box 2008, Subiaco, 6904
Subiaco
Western Australia, Australia
6008
Phone  ...  Subscription required
Fax+61-8-6188-2111
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StatusCare and Maintenance
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Longhole open stoping
Processing
  • Gravity separation
  • Calcining
  • Smelting
  • Inline Leach Reactor (ILR)
  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
At Paulsens, an underground reserve definition drilling program was completed within the mine area as part of an evaluation of the remaining underground ore reserve potential.

The Paulsens processing facility is currently on care and maintenance.


Owners

 
CompanyInterestOwnership
Northern Star Resources Ltd. 100 % Indirect

Deposit Type

  • Vein / narrow vein
  • Orogenic
  • Mesothermal


Summary:

The Paulsens deposit lies within the west-northwest trending regional Wyloo anticlinal dome. Archaean Fortescue Group metasediments and metavolcanics of the Hamersley Basin are exposed in the core of the dome and form the host rocks of the Paulsens deposit. Paulsens is a mesothermal, orogenic lodestyle gold deposit with mineralisation occurring within a structurally controlled quartz vein, up to 40m thick, hosted between a structurally offset section of gabbro intrusive, within a folded, sedimentary sequence. The quartz body is found between the two halves of a large faulted Gabbro dyke. The mineralisation is cut in places by a series of steeply dipping dolerite dykes that vary from one to ten metres in thickness.

The main body of mineralisation comprises an Upper (UZ) and Lower (LZ) Zone located on the hanging wall and footwall contacts respectively.


Mining Methods

  • Longhole open stoping


Summary:

The Paulsens underground is accessed via a single decline at the bottom of a 21m deep boxcut developed into the side of the Paulsens Hill which occurs adjacent to the mine office and milling complex. Underground mining takes place from a single decline with level accesses than run south to north with ore drives orientated east to west of the level accesses .

The primary stoping method at Paulsens is up hole longhole open stoping, with stopes retreating in a top down sequence and towards a central access. Other mechanised ore extraction methods include jumbo stripping and benching. There is also a limited amount of airleg stoping in the Paulsens Upper Zone. Stope sizes vary from ~1,000t to ~7,500t. The centroid of mining is approximately 750m vertically below the surface.


Crushing and Grinding


Processing

  • Gravity separation
  • Calcining
  • Smelting
  • Inline Leach Reactor (ILR)
  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Source: Subscription required

Summary:

The Paulsens Gold Mine utilises a Carbon in Leach (CIL) circuit for the extraction of gold.

The crushing plant is a three-stage facility that treats up to 150 tph of minus 550mm Run of-Mine (ROM) ore, to produce a crushed product with P80 of 8mm. The crushing plant consists of a primary jaw crusher and secondary and tertiary cone crushers. Oversize from an inclined double deck vibration screen (apertures 20mm and 8mm) reports to the cone crusher, and undersize reports to the fine ore storage bin (FOB), or the on-ground fine ore stockpile (FOS).

The grinding and classification facility operates 24 hours a day, 365 days a year, to mill 450 000 tpa. Grinding is performed by a 3.51m diameter by 5.63m long (inside shell) rubber lined overflow ball mill, equipped with a 1,000KW motor. A cluster of six hydrocyclones (four operational, two standby) is used to classify the slurry to a P80 of 106µm.

The underflow from the hydrocyclones is split with a stream p ........

Recoveries & Grades:

CommodityParameter20182017201620152014
Gold Recovery Rate, %  ......  Subscription required879089.390.1
Gold Head Grade, g/t  ......  Subscription required4.67.25.47.4

Production:

CommodityUnits20182017201620152014
Gold oz 22,43655,49080,74274,999100,041
All production numbers are expressed as metal in doré.
Subscription required - Subscription is required.

Operational Metrics:

Metrics2020201820172016
Annual processing capacity  ......  Subscription required450,000 t
Total tonnes mined  ......  Subscription required  ......  Subscription required352,029 t398,812 t
Tonnes milled  ......  Subscription required  ......  Subscription required434,246 t386,570 t
Subscription required - Subscription is required.

Reserves at June 30, 2020:

CategoryTonnage CommodityGradeContained Metal
Proven 197 kt Gold 4.9 g/t 31 koz
Probable 84 kt Gold 4 g/t 11 koz
Proven & Probable 281 kt Gold 4.6 g/t 42 koz
Measured 353 kt Gold 5.7 g/t 65 koz
Indicated 217 kt Gold 4.1 g/t 29 koz
Inferred 1,809 kt Gold 2 g/t 115 koz
Total Resource 2,379 kt Gold 2.7 g/t 209 koz

Commodity Production Costs:

CommodityUnits201820172016
All-in sustaining costs (sold) Gold AUD 1,450 / oz 1,455 / oz 1,099 / oz

Financials:

Units201820172016
Revenue M AUD 40  93.6   126.7  
EBITDA M AUD 9.23  34.2   64.9  


Heavy Mobile Equipment as of December 31, 2015:
HME TypeModelQuantity
ANFO Loader ....................... Subscription required 1
Drill (long hole) ....................... Subscription required 1
Jumbo ....................... Subscription required 1
Loader ....................... Subscription required 3
Loader ....................... Subscription required 1
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Oct 2, 2020
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Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2019
Annual Report 2018
Fact Sheet 2018
Annual Report 2017
Annual Report 2016
Fact Sheet 2015
Fact Sheet 2015
Technical Report 2009
Subscription required - Subscription is required.

Aerial view:

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