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Peru
Lagunas Norte Mine

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 Location:
87 km E from Trujillo, Peru

  Regional Office:
Av. Manuel Olguín N° 375 Piso 11 Santiago de Surco
Lima
Peru
33
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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
Commodities
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
Processing
  • Smelting
  • Heap leach
  • Carbon in column (CIC)
  • Merrill–Crowe
  • Cyanide (reagent)
Mine Life2023
Lagunas Norte has transitioned to care and maintenance at the end of the third quarter of 2019.

At Lagunas Norte, the company’s focus has been to drill out and update the PMR (refractory sulphide) orebody model and evaluate four prospective satellite oxide targets to establish whether it can add enough value to restart the mine and add additional infrastructure to process the refractory sulphide ore or sell it.
Latest NewsBarrick Reaches Agreement to Sell the Lagunas Norte Mine     February 16, 2021


Owners & OPERATOR

Source: p. 10
CompanyInterestOwnership
Barrick Gold Corp. 100 % Indirect
Minera Barrick Misquichilca S.A. (operator) 100 % Direct
The Mine is owned and operated by Minera Barrick Misquichilca S.A. (MBM), a wholly-owned Peruvian subsidiary of Barrick.

Deposit Type

  • Epithermal
  • Vein / narrow vein


Summary:

Lagunas Norte differs from many other large high- sulphidation epithermal gold deposits of the Andes in that a majority of the known resource is contained within Cretaceous siliciclastic sedimentary rocks, and a relatively small portion is within the Tertiary volcanic sequence that is the primary host elsewhere (e.g., Yanacocha, Pierina). The main host rock sequence at Lagunas Norte consists of quartz sandstones and subordinate interlayered mudstone, siltstone, and carbon-rich siltstone, correlated with the Lower Cretaceous Chimú Formation (Lewis, 2002).

The Lagunas Norte mineralization occurs in the southeast portion of the Alto Chicama property. The mineralization is finely disseminated and is hosted mostly by siliclastic sedimentary strata.

The mineralization within the present pit extends for approximately two kilometres in the north-northwest direction by approximately two kilometres in the east-northeast direction and for more than 200 m vertically.

Mineralization is the result of multiple volcanic and hydrothermal events. It is hosted in both the Tertiary volcanics of the Calipuy Group and the underlying Cretaceous sedimentary rocks of the Chimú Formation. The alteration associated with the mineralization is typical of a highsulphidation epithermal environment, characterized by silica (SiO 2 ), surrounded by alunite [KAl3(SO4)2(OH)6], dickite [Al2Si2O5(OH)4] and pyrophyllite [Al2Si4O10(OH)2]. Trace elements typically associated with these deposits include copper, arsenic, barium, bismuth, zinc, lead, and variable amounts of mercury (Silberman and Berger, 1985). The deposit has very low concentrations of carbonate minerals or other potentially acid neutralizing minerals.

There are both stratigraphic and structural controls on the mineralization. Mineralizing fluids ascended along the main fault systems and migrated laterally along stratigraphic contacts in both the sedimentary and volcanic rocks. At least two stages of sulphide mineralization are recognized. The sulphide assemblage comprises mainly pyrite (FeS2) with lesser amounts of enargite (Cu3AsS4) and occurs as replacement structures, veins, and disseminations in volcanic breccias and highly fractured and locally brecciated Chimú sandstones. Most of the mineralization (75%) occurs as oxide material, with approximately 25% occurring as sulphide material. Supergene oxidation has altered a large part of the sulphide assemblage to iron oxides and, to a lesser extent, sulphates. The extent of this oxidation ranges from a few metres to more than 300 m below surface. Approximately 90% of the mineralization is contained within the Chimú sediments and the balance is hosted in the Calipuy volcanic rocks.

The gold grade times thickness contours clearly show the Lagunas Norte deposit is approximately two kilometres by one kilometre wide.


Mining Methods

  • Truck & Shovel / Loader


Summary:

The Lagunas Norte Mine is a traditional open pit truck/shovel heap leach operation that has been in continuous production since 2005.

Open pit mining operations are located on a mountain top with gentle to extreme terrain between elevations of 3,800 MASL and 4,200 MASL. Mining from a single pit will continue until 2023, at a rate of 4.8 Mtpa during 2016 and 1.3 Mtpa thereafter beginning in 2017. Heap leach placement will continue during mining, with mine operations concluding in 2023.

The Lagunas Norte ultimate pit measures approximately 2.5 km along strike, typically 0.8 km to 1.2 km across with a surface footprint of approximately 240 ha, and has a maximum depth of approximately 250 m. There are four main areas of development identified within the ultimate pit: Dafne, Josefa, Alexa, and the moraines furthest to the north. The open pit is overlooked by the Shulcahuanca Dome, a sacred feature, and there is an approximate 50 m standoff from the base of the Shulcahuanca Dome for mine planning and operations.

Final arrangement of the Lagunas Norte waste rock facilities is for the continued development of surface dumps surrounding the Lagunas Norte ultimate pit other than to the south-southeast where the HLF is located, resulting in a relatively compact overall footprint.

Under the current mine plan, the Refractory Project is expected to start operation in 2021, feeding sulphide ore from the stockpile until 2029. Mining will principally include deepening of the central and southern portions of the current open pit. Mining is expected to be carried out using the existing mine fleet, at a rate of approximately 25 Mtpa total material moved at a stripping ratio of 4.4:1 (waste: mineralization). Due to the higher stripping ratio, an expansion of the current waste rock storage facilities will be required.


Crushing and Grinding


Processing

  • Smelting
  • Heap leach
  • Carbon in column (CIC)
  • Merrill–Crowe
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

The recovery process used at Lagunas Norte is a two-stage conventional crushing circuit, followed by heap leaching, and a Merrill Crowe zinc cementation plant and CIC for recovery of the precious metals. The major components of the process are:
• Primary crushing
• Secondary crushing
• Heap leaching
• Recovery plant
• Refinery
• Water discharge treatment plant.

CRUSHING CIRCUIT
The crushing circuit was originally designed to crush 42,000 tpd, but the capacity is permitted to 63,000 tpd. Historically, it was determined that the gold recovery from heap leaching at Lagunas Norte is not overly dependent on crush size so the size has been increased over time to allow more material to be processed through the crushing circuit. Haul trucks dump ore directly into the gyratory crusher. A rock breaker is available to break large rocks at the mouth of the primary crusher. The ore is discharged through an apron feeder onto belt conveyor number one whic ........

Recoveries & Grades:

CommodityParameter2019201820172016201520142013
Gold Head Grade, g/t 1.210.911.051.121.020.991.06
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Production:

CommodityUnits201920182017201620152014
Gold koz  ......  Subscription required  ......  Subscription required387435560582
Silver koz  ......  Subscription required
All production numbers are expressed as metal in doré.
Subscription required - Subscription is required.

Operational Metrics:

Metrics201920182017201620152014
Total tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required40,847 kt49,126 kt50,030 kt
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required
Waste  ......  Subscription required  ......  Subscription required  ......  Subscription required
Stripping / waste ratio  ......  Subscription required  ......  Subscription required  ......  Subscription required1.5 1.2 0.9
Tonnes processed  ......  Subscription required  ......  Subscription required  ......  Subscription required17,253 kt21,880 kt22,110 kt
Daily mining rate  ......  Subscription required  ......  Subscription required  ......  Subscription required112 kt135 kt137 kt
Daily processing rate  ......  Subscription required  ......  Subscription required  ......  Subscription required47.1 kt59.9 kt60.6 kt
Subscription required - Subscription is required.

Reserves at December 31, 2018:

CategoryTonnage CommodityGradeContained Metal
Proven 23,630 kt Gold 2.5 g/t 1,896 koz
Proven 23,630 kt Silver 5.47 g/t 4,152 koz
Probable 21,256 kt Gold 3.01 g/t 2,056 koz
Probable 21,256 kt Silver 7.01 g/t 4,788 koz
Proven & Probable 44,886 kt Gold 2.74 g/t 3,952 koz
Proven & Probable 44,886 kt Silver 6.19 g/t 8,940 koz
Measured 1,136 kt Gold 1.07 g/t 39 koz
Measured 1,136 kt Silver 2.82 g/t 103 koz
Indicated 15,814 kt Gold 1.13 g/t 576 koz
Indicated 15,814 kt Silver 2.7 g/t 1,371 koz
Measured & Indicated 16,950 kt Gold 1.13 g/t 615 koz
Measured & Indicated 16,950 kt Silver 2.7 g/t 1,474 koz
Inferred 1,546 kt Gold 1.35 g/t 67 koz
Inferred 1,546 kt Silver 5.23 g/t 260 koz

Commodity Production Costs:

CommodityUnits2019201820172016201520142013
Cash costs Gold USD  ......  Subscription required 446 / oz 423 / oz 361 / oz 403 / oz
Cash costs Gold USD  ......  Subscription required† 405 / oz† 383 / oz† 329 / oz† 379 / oz† 361 / oz†
Total cash costs Gold USD  ......  Subscription required
Total cash costs Gold USD  ......  Subscription required†
All-in sustaining costs (AISC) Gold USD  ......  Subscription required  ......  Subscription required 524 / oz 569 / oz 541 / oz 567 / oz
All-in sustaining costs (AISC) Gold USD  ......  Subscription required†  ......  Subscription required† 483 / oz† 529 / oz† 509 / oz† 543 / oz† 627 / oz†
All-in costs Gold USD  ......  Subscription required  ......  Subscription required 538 / oz 580 / oz 541 / oz 567 / oz
All-in costs Gold USD  ......  Subscription required†  ......  Subscription required† 497 / oz† 540 / oz† 509 / oz† 543 / oz† 627 / oz†
† Net of By-Product.
Subscription required - Subscription is required.

Operating Costs:

Units201920182017201620152014
OP mining costs ($/t mined) USD 3.283.223.322.472.222.35
Processing costs ($/t milled) USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Financials:

Units2019201820172016201520142013
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 67   81   139  
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 67   81   139  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 673   775   839  
EBITDA M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 454   531   602  
Subscription required - Subscription is required


Heavy Mobile Equipment:
HME TypeModelQuantityRef. Date
Backhoe ....................... Subscription required 1 Dec 31, 2015
Backhoe ....................... Subscription required 1 Dec 31, 2015
Dozer (crawler) ....................... Subscription required 6 Dec 31, 2015
Dozer (crawler) ....................... Subscription required 1 Dec 31, 2015
Dozer (rubber tire) ....................... Subscription required 1 Dec 31, 2015
Dozer (rubber tire) ....................... Subscription required 2 Dec 31, 2015
Drill ....................... Subscription required 2 Dec 31, 2015
Drill ....................... Subscription required 1 Dec 31, 2015
Drill ....................... Subscription required 1 Dec 31, 2015
Drill ....................... Subscription required 1 Dec 31, 2015
Drill ....................... Subscription required 1 Dec 31, 2015
Grader ....................... Subscription required 3 Dec 31, 2015
Loader ....................... Subscription required 3 Feb 22, 2017
Shovel ....................... Subscription required 2 Feb 22, 2017
Truck (haul) ....................... Subscription required 19 Feb 22, 2017
Truck (haul) ....................... Subscription required 4 Feb 22, 2017
Truck (water) ....................... Subscription required 2 Dec 31, 2015
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jul 23, 2020
....................... Subscription required ....................... Subscription required Subscription required Jul 23, 2020
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
Other 2017
Quarterly Report 2017
Management Discussion & Analysis 2016
Press Release 2016
Press Release 2016
Technical Report 2016
Annual Report 2015
Press Release 2015
Technical Report 2015
Annual Report 2014
Technical Report 2012
Subscription required - Subscription is required.

News:

NewsDate
Barrick Reaches Agreement to Sell the Lagunas Norte Mine February 16, 2021

Aerial view:

Subscription required - Subscription is required.

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