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Mongolia
Hugo North Lift 1 Expansion Mine (Oyu Tolgoi)

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 Location:
539 km from Ulaanbaatar, Mongolia

  Regional Office:
Monnis Tower, Chinggis Avenue 15 Sukhbaatar District - 14240
Ulaanbaatar
Mongolia
Phone  ...  Subscription required
Fax+(976)-(11)-331890
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
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  • Production
  • Reserves
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  • Filings & News

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Overview

StatusArchived
Mine TypeUnderground
Commodities
  • Copper
  • Gold
  • Silver
Mining Method
  • Block caving
Mine Life31 years (as of Jan 1, 2021)
13th March 2023 - Commencement of underground production from the Oyu Tolgoi copper mine in the Gobi Desert.

Ore is currently being processed from Panel Zero in Hugo North Lift 1 and production will ramp up over the coming years.
Latest NewsRio Tinto and Mongolian Government ‘open’ Oyu Tolgoi Underground mine     March 13, 2023


Owners

Source:
CompanyInterestOwnership
Rio Tinto plc (operator) 66 % Indirect
Oyu Tolgoi LLC (operator) 100 % Direct
13th March 2023 - Rio Tinto now has a 66% interest in Oyu Tolgoi LLC, the mine operating company, following its successful completion of the acquisition of Turquoise Hill Resources Ltd; with the Government of Mongolia retaining 34%.

Contractors

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Deposit Type

  • Porphyry
  • Vein / narrow vein


Summary:

The Oyu Tolgoi copper-gold porphyry deposits are situated in a poorly exposed inlier of Devonian mafic to intermediate volcanic, volcaniclastic, and sedimentary rocks that have been intruded by Devonian to Permian felsic plutons. These rocks are unconformably overlain by poorly consolidated Cretaceous sedimentary rocks and younger unconsolidated sedimentary deposits.

Oyu Tolgoi consists of Oyut, Hugo Dummett (Hugo South and Hugo North) and Heruga deposits. The
Oyu Tolgoi copper-gold deposits currently comprise, from north to south:
• Hugo North – The Hugo Dummett Deposit north the 110 Fault.
• Hugo South - The Hugo Dummett Deposit south the 110 Fault.
• Oyut - The Oyut Deposit includes the Southwest Oyu, South Oyu, Wedge, Central Oyu,
Bridge, Western, and Far South zones.
• Heruga – is within the area governed by the arrangements between Oyu Tolgoi LLC and
Entrée LLC except for a small northern portion that lies within the Oyu Tolgoi.

Hugo Dummett deposits
The Hugo Dummett deposits, Hugo North and Hugo South, contain porphyry-style mineralization associated with quartz-monzodiorite intrusions, concealed beneath a sequence of Upper Devonian and Lower Carboniferous sedimentary and volcanic rocks. The deposits are highly elongated to the north northeast and extend over 3 km. The Hugo North zone is virtually contiguous with the Hugo South zone and lie within a similar geological setting. The two deposits are separated ........


Mining Methods

  • Block caving


Summary:

The mineral deposits at the Oyu Tolgoi Property lie in a structural corridor where mineralization has been discovered over a 26 km strike length. Four deposits hosting mineral resources have been identified within the Property: Hugo North, Hugo South, Oyut and Heruga.

Hugo North and Hugo South are also known as the Hugo Dummett deposits. The Oyut deposit, formerly known as Southern Oyu Tolgoi, is currently mined as an open pit using a conventional drill, blast, load, and haul method. The Hugo North deposit is currently being developed as an underground mine.

Mining of the Oyut deposit started in 2012 using open pit mining methods. The Oyut open pit mine currently has an ore production rate of about 40 Mtpa.

The current production rate from the Oyut open pit continues until 2023, after which it will be progressively reduced as production builds up from underground. Open pit mining will continue in parallel with Hugo North Lift 1 to keep the Oyu Tolgoi concentrator operating at its design capacity. Following depletion of Lift 1, production from the Oyut open pit will be increased to meet mill capacity.

Underground mining
The Hugo North mine plan envisages construction of a block cave operation with a nameplate production rate of 33 Mtpa. Lift 1 is planned to be extracted in three panels (Panel 0, Panel 1, and Panel 2). Mining is planned to start in Panel 0 followed by Panel 2 and Panel 1. Hugo North Lift 2 is currently planne ........


Crushing and Grinding
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Processing

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Summary:

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Production:

CommodityProductUnitsAvg. Annual (Projected)LOM (Projected)
Copper Concentrate kt 1,00031,100
Copper Payable metal M lbs 19610
Gold Payable metal koz  ......  Subscription required  ......  Subscription required
Silver Payable metal M oz  ......  Subscription required  ......  Subscription required


Reserves at June 30, 2020:
For the Oyut Mineral Reserve, processing and G&A costs used to determine NSR cut-off values vary between 7.18 US$/t and 10.14 US$/t depending on the ore type processed.
For the Oyut deposit, a cut-off grade of 0.24% CuEq has been used for Mineral Resources with open pit potential. A cut-off 0.41% CuEq has been used for Mineral Resources with underground mining potential.

CategoryTonnage CommodityGradeContained Metal
Proven 350 Mt Copper 0.49 % 1.7 Mt
Proven 350 Mt Gold 0.35 g/t 4 M oz
Proven 350 Mt Silver 1.3 g/t 14 M oz
Probable 920 Mt Copper 0.93 % 8.5 Mt
Probable 920 Mt Gold 0.27 g/t 7.9 M oz
Probable 920 Mt Silver 2.1 g/t 62 M oz
Proven & Probable 1,270 Mt Copper 0.81 % 10 Mt
Proven & Probable 1,270 Mt Gold 0.29 g/t 12 M oz
Proven & Probable 1,270 Mt Silver 1.9 g/t 77 M oz
Measured 87 Mt Copper 1.4 % 1.2 Mt
Measured 87 Mt Gold 0.53 g/t 1.5 M oz
Measured 87 Mt Silver 3.2 g/t 9 M oz
Indicated 640 Mt Copper 1.2 % 7.3 Mt
Indicated 640 Mt Gold 0.39 g/t 8 M oz
Indicated 640 Mt Silver 2.8 g/t 58 M oz
Measured & Indicated 720 Mt Copper 1.2 % 8.5 Mt
Measured & Indicated 720 Mt Gold 0.41 g/t 9.4 M oz
Measured & Indicated 720 Mt Silver 2.9 g/t 67 M oz
Inferred 3,700 Mt Copper 0.6 % 22 Mt
Inferred 3,700 Mt Gold 0.29 g/t 34 M oz
Inferred 3,700 Mt Silver 1.8 g/t 210 M oz


Pipelines
TypeMaterialDiameterLengthDescription


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jun 30, 2020
....................... Subscription required ....................... Subscription required Subscription required Jun 30, 2020
....................... Subscription required ....................... Subscription required Subscription required Mar 15, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 15, 2023
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Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2022
Half-year Report 2022
Management Discussion & Analysis 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
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News:

NewsDate
Rio Tinto and Mongolian Government ‘open’ Oyu Tolgoi Underground mine March 13, 2023

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