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Papua New Guinea
Porgera Mine

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 Location:
629 km NW from Port Moresby, Papua New Guinea

  Address:
PO Box 484
Mount Hagen, WHP
Papua New Guinea
Phone  ...  Subscription required
Fax+675-547-8132
WebsiteWeb
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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 TypeOpen Pit & Underground
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
  • Longhole stoping
  • Paste backfill
Processing
  • Gravity separation
  • ACACIA reactor
  • Carbon re-activation kiln
  • Flotation
  • Concentrate leach
  • Counter current decantation (CCD)
  • Agitated tank (VAT) leaching
  • Pressure oxidation
  • Carbon in leach (CIL)
  • Carbon in pulp (CIP)
  • Elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life2023
Porgera has been on care and maintenance since April 2020 when the government declined to renew its special mining lease.

April 10, 2021: Barrick Niugini Limited confirms that a binding framework agreement, the first step of the process to reopen Porgera Mine has been agreed between Barrick Niugini Limited and the Government of Papua New Guinea.

In addition to outlining future benefit-sharing principles and proposed management arrangements for the mine, the agreement also defines the definitive implementation agreements that will need to be completed to allow for the resumption of mining at Porgera – currently planned to occur later this year if mutually agreed conditions are met.
Latest NewsBarrick unable to confirm Porgera restart     October 13, 2021


Owners

Source: p. 1
CompanyInterestOwnership
Barrick Gold Corp. 24.5 % Indirect
Zijin Mining Group Co., Ltd 24.5 % Indirect
Barrick (Niugini) Ltd. (operator) 49 % Direct
PNG Government 51 % Direct
Canada’s Barrick Gold (TSX: ABX) (NYSE: GOLD) and Papua New Guinea (PNG) have ended a year-long standoff with an agreement that gives the country’s government a majority stake in the Porgera gold mine and outlines plans to restart operations.

The agreement sets up a new joint venture, in which PNG stakeholders will have a 51% stake and Barrick Niugini Limited (BNL) 49%. The partnership owns the gold mine, but BNL remains as the operator. BNL is a joint venture company in which Barrick and Zijin Mining Group each own 50%.

The state to retain the right to acquire the remaining 49% of the mine from BNL at fair market value after 10 years.

Deposit Type

  • Breccia pipe / Stockwork
  • Epithermal
  • Vein / narrow vein


Summary:

Porgera Mine is an epithermal vein-type gold-silver deposit but it shares many characteristics with porphyry copper deposits. Remnant heat from the intrusive rocks drove the boiling and upward migration of hydrothermal fluids and resulted in the emplacement of mineralization. The movement of these fluids was controlled by permeability of the rock mass, which developed in and around faults and tectonic zones of dilatancy. As such, the mineralization tends to occur in tabular bodies and breccia zones, the geometry of which is strongly influenced by the orientation of fault structures and subsidiary fractures. Deposition of ore minerals in epithermal systems is also dependent upon temperature and hydrostatic pressure. These conditions are generally closely related to elevation, with reduction of both temperature and pressure as the fluids migrate upwards.


Mining Methods

  • Truck & Shovel / Loader
  • Longhole stoping
  • Paste backfill


Summary:

The Porgera Joint Venture is an open pit and underground gold mine located at an altitude of 2,200- 2,600 meters in the Enga Province of Papua New Guinea.

The Open Pit mine is 500 meter deep, below the highest point of surface topography and approximately 30 million tonnes (t) of ore per year is excavated. The material mined is a combination of gold bearing ore and barren waste.

Pit dimensions: 2.0km long x 1.2km wide x 400m deep.

Mining in the open pit is undertaken on 10 meter high benches. When the material is too hard to be free dug, the rock is drilled and blasted with a range of drill patterns to suit the litholog.

The Open Pit is a conventional truck and shovel operation and is serviced by a large modern mining fleet of 175t and 90t haul trucks, loaded by 200t and 120t shovels and excavators. There are also smaller 40t and 35t excavators for ancillary work.

The Porgera Underground Mine is a modern, trackless mine, producing approximately 1.4 million tonnes of ore per year from three primary production areas: North Zone, East Zone and AHD.

The underground (UG) operation mines the lodes at depth currently up 330 meter beneath the current pit floor. The Underground operation has a strike extent of approximately 1.6 kilometer (km). The primary access is via a twin decline system from surface with secondary internal accesses connecting the various mining areas.

Mining is done by convention long hole open stoping. Drives are developed along the strike of the lenses at 15m vertical intervals with long-hole stoping used to extract the ore between these levels.

The voids generated by mining are back-filled with a combination of paste and co-paste disposal to enhance ground stability and allow maximum extraction of ore.

The UG mine operates on a modern trackless mining fleet consisting of CAT 2,900 loaders, 45t and 55t capacity haul trucks and supporting drills and auxiliary equipment.


Crushing and Grinding


Processing

  • Gravity separation
  • ACACIA reactor
  • Carbon re-activation kiln
  • Flotation
  • Concentrate leach
  • Counter current decantation (CCD)
  • Agitated tank (VAT) leaching
  • Pressure oxidation
  • Carbon in leach (CIL)
  • Carbon in pulp (CIP)
  • Elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

Ore is processed in a complex minerals processing plant. The open-pit and underground mines supply both course gold and refractory ore to a processing plant that includes crushing, grinding, gravity recovery, flotation, oxidation (autoclave) and Carbon In Pulp (CIP) circuits to produce a gold dore product and a high grade pyrite concentrate for shipment to offsite refineries and smelters for final processing.

The major components on the Porgera processing plant include:

- crushing circuit and coarse and fine ore storage;
- grinding circuit;
- gravity and regrind circuit;
- flotation circuit;
- pressure oxidation and tailings neutralisation circuits;
- leaching and adsorption circuits;
- acid wash and stripping elution circuit;
- electrowinning and gold refinery;
- oxygen plant;
- chemical storage and mixing;
- cyanide destruct plant; and
- tailings pipework and infrastructure.

Run-of-Mine (ROM) ore ........

Recoveries & Grades:

CommodityParameter2020201920182017201620152014
Gold Head Grade, g/t  ......  Subscription required  ......  Subscription required3.463.033.053.593.1
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required868688.286.788.5

Production:
On April 25, 2020, Porgera was placed on care and maintenance after the Government of Papua New Guinea communicated on April 24, 2020 that the Special Mining Lease would not be extended.

CommodityUnits2020201920182017201620152014
Gold koz  ......  Subscription required  ......  Subscription required430495493554519
All production numbers are expressed as metal in conc./ doré.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202020192018201720162015
Total tonnes mined  ......  Subscription required27,697 kt20,762 kt24,219 kt16,924 kt22,139 kt
Ore tonnes mined  ......  Subscription required5,789 kt
Waste  ......  Subscription required21,907 kt17,956 kt20,867 kt
Stripping / waste ratio  ......  Subscription required5.7 15 12.9
Tonnes processed  ......  Subscription required5,558 kt4,501 kt5,891 kt5,705 kt6,323 kt
Daily milling capacity  ......  Subscription required16,100 kt15,600 t15,200 t
Daily mining rate  ......  Subscription required45.9 kt62.1 kt
Subscription required - Subscription is required.

Reserves at December 31, 2020:
The Numbers in the Annual Report 2019 are given on 47.5% basis.

CategoryTonnage CommodityGradeContained Metal
Proven 2 Mt Gold 6.79 g/t 0.5 M oz
Probable 29 Mt Gold 4.59 g/t 4 M oz
Proven & Probable 32 Mt Gold 4.75 g/t 5 M oz
Measured 3 Mt Gold 6.66 g/t 0.57 M oz
Indicated 59 Mt Gold 4.09 g/t 8 M oz
Inferred 21 Mt Gold 3.5 g/t 2 M oz

Commodity Production Costs:

CommodityUnits202020192018201720162015
Cash costs Gold USD 810 / oz 791 / oz 697 / oz 794 / oz
Cash costs Gold USD 796 / oz† 781 / oz† 689 / oz† 791 / oz†
Total cash costs Gold USD  ......  Subscription required  ......  Subscription required
Total cash costs Gold USD  ......  Subscription required†  ......  Subscription required† 828 / oz† 878 / oz†
All-in sustaining costs (AISC) Gold USD  ......  Subscription required  ......  Subscription required 1,097 / oz 1,003 / oz 866 / oz 1,021 / oz
All-in sustaining costs (AISC) Gold USD  ......  Subscription required†  ......  Subscription required† 1,083 / oz† 993 / oz† 858 / oz† 1,018 / oz†
All-in costs Gold USD  ......  Subscription required  ......  Subscription required 1,097 / oz 1,003 / oz 866 / oz 1,021 / oz
All-in costs Gold USD  ......  Subscription required†  ......  Subscription required† 1,083 / oz† 993 / oz† 858 / oz† 1,018 / oz†
† Net of By-Product.
Subscription required - Subscription is required.

Operating Costs:

Units2020201920182017201620152014
OP mining costs ($/t mined) USD 4.183.64.034.535.514.665.53
UG mining costs ($/t mined) USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Processing costs ($/t milled) USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
G&A ($/t milled) USD  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Financials:

Units20202019201820172016
Capital expenditures M USD  ......  Subscription required  ......  Subscription required131   116   86  
Sustaining costs M USD  ......  Subscription required  ......  Subscription required131   116   86  
Revenue M USD  ......  Subscription required  ......  Subscription required
Operating Income M USD  ......  Subscription required  ......  Subscription required
EBIT M USD
EBITDA M USD  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required


Heavy Mobile Equipment as of February 22, 2018:
HME TypeModelQuantity
Excavator ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required ....................... Subscription required
Shovel ....................... Subscription required ....................... Subscription required
Truck (haul) ....................... Subscription required ....................... Subscription required
Truck (haul) ....................... Subscription required ....................... Subscription required
Truck (underground) ....................... Subscription required ....................... Subscription required
Truck (underground) ....................... Subscription required ....................... Subscription required
Truck (underground) ....................... Subscription required ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 28, 2021
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Corporate Presentation 2018
Other 2018
Quarterly Report 2018
Operations & Technical Update 2017
Other 2017
Press Release 2017
Management Discussion & Analysis 2016
Other 2016
Other 2016
Annual Report 2014
Other 2013
Technical Report 2012
Subscription required - Subscription is required.

News:

NewsDate
Barrick unable to confirm Porgera restart October 13, 2021
Barrick Gold Corp.: Porgera Moves Closer to Restart June 4, 2021
Porgera gold mine set for restart April 13, 2021
Barrick Gold Corp.: Porgera Mine Set to Restart as PNG and Barrick Niugini Limited Agree New Partnership April 9, 2021
Barrick cancels Porgera guidance following mine lease block May 8, 2020
Barrick Niugini Limited Challenges Non-Extension of Special Mining Lease April 24, 2020
Barrick Gold Corp.: Court Decision Allows Continued Mining At Porgera August 2, 2019

Aerial view:

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