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Papua New Guinea
Ok Tedi (Mt. Fubilan) Mine

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 Location:
100 km N from Kiunga, Papua New Guinea

  Address:
1 Dakon Road
Tabubil
Papua New Guinea
332
Phone  ...  Subscription required
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Copper
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
Processing
  • Gravity separation
  • Centrifugal concentrator
  • Flotation
Mine Life2029
Latest NewsOk Tedi to ramp up production following mine restart     April 1, 2021


Owners

Source:
CompanyInterestOwnership
Ok Tedi Mining Ltd. 100 % Direct
OTML is a 100 percent Papua New Guinea (PNG) owned entity with 67 percent direct shareholding by the Independent State of PNG and the people of Western Province holding a 33 percent interest.

Deposit Type

  • Skarn
  • Porphyry
  • Breccia pipe / Stockwork


Summary:

The Ok Tedi mining operations are centred on the Mt Fubilan deposit in the upper Fly River catchment in the remote Star Mountains, Western Province.

Mt Fubilan is a rich coppergold-silver deposit with several phases of mineralisation centred on two intrusions, known as the Fubilan monzonite porphyry, located in the northern half or Centre Pit area and the Sydney monzodiorite stockworks with subsequent alteration in the south. Majority of the ore is found in the sulphide skarns, located adjacent to the intrusions along the contacts with the limestone and siltstone units.

In 2020, OTML continued to target the discovery of new mineral resources within the Special Mining Lease One (SML1) to replace mined reserves and extend the project mine life.

The geology and exploration teams completed further resource definition drilling on the Darien and Wellington deposits during 2020 and submitted samples for laboratory analysis. Resourceestimates will be completed in early 2021. The focus for 2021 will be to continue deep resource drilling in the New York Breccia and other breccia targets.

Near-mine exploration in 2020 focused on the definition of previously indicated mineralisation in SML1. Thirty holes with a combined length of over 11,800 metres (m) were drilled during the year.

New York Breccia
Two new high-capacity LF90 drill rigs were mobilised in late 2020 to undertake systematic directional resource definition drilling to deeper levels within the New York Breccia deposit. Atotal of eight resource definition drill holes targeting the New York Breccia were completed in 2020.

A preliminary conceptual mining study identified potential mining options in the New York Breccia system, but additional exploration in 2021 will be needed to increase the volume of potentially mineable material.

Wellington
A total of 13 resource definition drill holes targeting the Wellington deposit were completed in 2020, with a maiden resource estimate to be finalised in 2021.

Mineralisation at Wellington consists of a complex series of magnetite skarn and calc-silicate endoskarns associated with the Taranaki Thrust and limestone / intrusive contacts.

Darien
Mineralisation at Darien consists of a small copper/gold porphyry system immediately west of the New York Breccia. Historic drilling has indicated copper mineralisation, but the extent of the system has never been accurately defined. Resource definition will be completed in conjunction with the Wellington skarn update.

Gilor Breccia
Resource definition of the Gilor Breccia was planned for early 2020. A drill pad and camp site were established but the program was shut down in March due to COVID-19 restrictions. The program will be reinstated in 2021.


Mining Methods

  • Truck & Shovel / Loader


Summary:

Mining of the Mt Fubilan Ore Reserves continues to be carried out as a large open pit operation. Mining is conducted using conventional drill and blast techniques, with shovel and excavator loading equipment. Ore is mined and transported to a primary crusher as first stage processing or to a Run of Mine stockpile, where blending of various ore types can take place. Waste rock is characterised according to its Acid Rock Drainage (ARD) potential and disposed of in one of five waste dumps. Limestone waste rock is selectively dumped together with potential ARD waste rock to neutralise acid production.

The current pit design and pit sequencing has been developed to maximise value while meeting environmental constraints agreed with mine-affected communities.

With approximately 9,000 mm of rainfall per annum, incident rainfall and runoff contributes significant volumes of free water draining into the pit. Rainwater also permeates into the rock mass contributing to instability due to increased pore pressure.

Comprehensive monitoring of hydrological and geotechnical factors are incorporated in mining strategy and plans to ensure safe operations.


Crushing and Grinding
Crusher / Mill TypeModelSizePowerQuantity
Gyratory crusher 1
SAG mill 2
Ball mill 4

Summary:

The ore is crushed in a primary crusher at a nominal 8,000 tonnes per hour and conveyed to a primary ore stockpile. The primary ore is then ground (two trains each comprising a SAG mill and two ball mills) to a final grain size of approximately 180 microns.

OTML commissioned and handed over the new Crusher Replacement Project (CRP) on December 14, 2020. Initially identified as a key focus area in the OTML 2017 strategic business plan, the project consists of a new gyratory crusher, screening plant, coarse ore stockpile, together with demolition and removal of the existing old crushing and conveyor system.


Processing

  • Gravity separation
  • Centrifugal concentrator
  • Flotation

Source: Subscription required

Summary:

OTML’s business operations are centred on the Mt Fubilan deposit located in the Star Mountains. The deposit is mined as a large open pit with a flotation processing plant capable of treating in the order of 22 to 24 million tonnes per annum (Mtpa), and currently recovering copper and gold into a saleable concentrate using conventional technology. The throughput rate is highly dependent on the ore lithology delivered from the mine. The concentrate product contains approximately 25% copper with gold content in the range of 15 to 25 g/t.

Ore is mined and processed at an onsite flotation processing plant capable of treating up to 24 million tonnes per annum (Mtpa). The plant currently recovers copper, gold and silver into a saleable concentrate.

The primary ore is crushed and ground using Semi-Autogenous Grinding and Ball mills to a final grain size of approximately 180 microns.

The finely ground material is treated in two mineral floatation circuits to e ........

Recoveries & Grades:

CommodityParameter2020201920182017201620152014
Copper Recovery Rate, %  ......  Subscription required  ......  Subscription required8683.585.885.483.8
Copper Head Grade, %  ......  Subscription required  ......  Subscription required0.590.630.580.460.54
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required5959.158.265.765.4
Gold Head Grade, g/t  ......  Subscription required  ......  Subscription required0.780.710.730.640.68
Copper Concentrate Grade, %  ......  Subscription required  ......  Subscription required24.524.525
Gold Concentrate Grade, g/t  ......  Subscription required  ......  Subscription required202020

Production:

CommodityProductUnits2021202020192018201720162015
Copper Metal in concentrate kt  ......  Subscription required ^  ......  Subscription required  ......  Subscription required961058045
Copper Concentrate kt  ......  Subscription required  ......  Subscription required394437320186
Gold Metal in concentrate koz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Metal in concentrate koz  ......  Subscription required  ......  Subscription required
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202020192018201720162015
Total tonnes mined  ......  Subscription required105.7 Mt89.5 Mt84.6 Mt58.1 Mt42.6 Mt
Tonnes milled  ......  Subscription required18.7 Mt18.9 Mt20.1 Mt16.1 Mt11.8 Mt
Annual processing capacity  ......  Subscription required24 Mt23 Mt24 Mt24 Mt
Ore tonnes mined  ......  Subscription required16.8 Mt
Stripping / waste ratio  ......  Subscription required2.46
Subscription required - Subscription is required.

Reserves at December 31, 2020:

CategoryTonnage CommodityGrade
Proven 65 Mt Copper 0.53 %
Proven 65 Mt Gold 0.58 g/t
Probable 145 Mt Copper 0.78 %
Probable 145 Mt Gold 0.94 g/t
Proven & Probable 210 Mt Copper 0.7 %
Proven & Probable 210 Mt Gold 0.83 g/t
Measured 113 Mt Copper 0.45 %
Measured 113 Mt Gold 0.48 g/t
Indicated 266 Mt Copper 0.61 %
Indicated 266 Mt Gold 0.76 g/t
Inferred 59 Mt Copper 0.54 %
Inferred 59 Mt Gold 0.8 g/t
Total Resource 438 Mt Copper 0.56 %
Total Resource 438 Mt Gold 0.69 g/t

Commodity Production Costs:

CommodityUnits201920182017
C1 cash costs Copper USD  ......  Subscription required 1.22 / lb 0.93 / lb
Subscription required - Subscription is required.

Operating Costs:

Units201920182017
OP mining costs ($/t mined) USD 2.622.491.97

Financials:

Units2020201920182017
Capital expenditures M PGK  ......  Subscription required  ......  Subscription required668   174  
Sustaining costs M PGK  ......  Subscription required
Revenue M  ......  Subscription required  ......  Subscription required845  USD 996  USD
Operating Income M  ......  Subscription required  ......  Subscription required188  USD 378  USD
Pre-tax Income M  ......  Subscription required  ......  Subscription required200  USD 378  USD
After-tax Income M  ......  Subscription required  ......  Subscription required141  USD 266  USD
Subscription required - Subscription is required


Heavy Mobile Equipment as of December 31, 2016:
HME TypeModelQuantity
Excavator ....................... Subscription required ....................... Subscription required
Shovel ....................... Subscription required ....................... Subscription required
Truck (haul) ....................... Subscription required ....................... Subscription required
Truck (haul) ....................... Subscription required ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jul 26, 2021
....................... Subscription required ....................... Subscription required Subscription required Jul 26, 2021
....................... Subscription required ....................... Subscription required Subscription required Jul 26, 2021
....................... Subscription required ....................... Subscription required Subscription required Jul 26, 2021
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2020
Subscription required 2019
Subscription required 2018
Subscription required 2017
Subscription required 2016

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2019
................................... Subscription required 2019
Annual Review 2018
Annual Review 2017
Annual Review 2016
Subscription required - Subscription is required.

News:

NewsDate
Ok Tedi to ramp up production following mine restart April 1, 2021
Ok Tedi suspends mine amid COVID-19 outbreak March 22, 2021
Ok Tedi Mining Ltd.: Ok Tedi mine life extended by three years September 9, 2020
Ok Tedi suspends PNG operations due to COVID-19 August 7, 2020

Aerial view:

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