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Peru
Lagunas Norte Mine

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 Location:
87 km E from Trujillo, Peru

  Regional Office:
12th Floor, Manuel Olguín Avenue 325, Santiago de Surco
Lima
Peru
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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
  • Filter press plant
  • Heap leach
  • Carbon in column (CIC)
  • Merrill–Crowe
  • Cyanide (reagent)
Mine Life22 years (as of Jan 1, 2021)
While mining operations were placed on care and maintenance in 2019, Lagunas Norte’s gold recovery plant has continued to produce gold from leach pad ore and Boroo expects to recover approximately in excess of 100koz of gold inventory by 2023.

The next phase of the mine will be to recover gold from carbonaceous oxide ore through the Carbonaceous Material Oxides Project (“CMOP”) and sulphide ore through the Refractory Material Project (“PMR”).

The CMOP project is designed to process about 15.0 million tonnes of high-grade gold bearing oxides mined early in the life of Lagunas Norte property.
Latest NewsBoroo completes acquisition of Lagunas Norte mine     June 1, 2021


Owners

Source:
CompanyInterestOwnership
Minera Boroo Misquichilca S.A. (operator) 100 % Direct
Boroo Pte Ltd. 100 % Indirect
On June 1, 2021, Boroo Pte. Ltd. completed the acquisition of a 100% interest in the Lagunas Norte mine in Peru from Barrick Gold Corporation.

The Mine is owned and operated by Minera Barrick Misquichilca S.A. (MBM).

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.

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.


Crushing and Grinding
Flow Sheet: Source
Crusher / Mill TypeModelSizePowerQuantity
Gyratory crusher 1
Cone crusher ....................... Subscription required 2

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.

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 which conveys it to a 2,000 tonne live capacity stockpile.

From the stockpile the ore is fed to the secondary crushers by conveyor belt number two. A splitter divides the feed into two parallel lines. Each line has a double deck screen. Oversize material passes to an MP800 secondary crusher which reduces the size to 80% passing (P80) approximately 50 mm. The product from each line is delivered to belt conveyors number three and number four, which in turn deliver the crushed ore to conveyor belt number five. Finally, the material is stored in the 1,000 tonne live capacity ore bin. From the bin the crushed ore is loaded into haul trucks that transport the ore to the leach pad. Lime is added to the trucks to raise the pH of the bleach solution.


Processing

  • Smelting
  • Filter press plant
  • 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.

HEAP LEACH PAD
The leach pad stacking plan is developed by the leach department and the Technical Services department at Lagunas Norte. Stacking of the crushed ore is done in 10 m high lifts. A high precision GPS dozer assists in the stacking operation by pushing the material over the edge of the surface while maintaining a level surface and preventing excessive segregation of the material. After completing the stacking of one cell, the surface is ripped using dozers to scarify the upper layer that has been compacted by the operation of the haul trucks on the leach pad during ma ........

Recoveries & Grades:

CommodityParameter201920182017201620152014
Gold Head Grade, g/t  ......  Subscription required0.911.051.121.020.99
Gold Recovery Rate, %  ......  Subscription required707883

Production:
While mining operations were placed on care and maintenance in 2019, Lagunas Norte’s gold recovery plant has continued to produce gold from leach pad ore.

CommodityUnits2021202020192018201720162015
Gold koz  ......  Subscription required  ......  Subscription required  ......  Subscription required245387435560
Silver koz  ......  Subscription required
All production numbers are expressed as metal in doré.
Subscription required - Subscription is required.

Operational Metrics:

Metrics2019201820172016201520142013
Total tonnes mined 12,388 kt31,357 kt32,859 kt40,847 kt49,126 kt50,030 kt36,934 kt
Ore tonnes mined 2,396 kt9,774 kt17,201 kt
Waste 9,992 kt21,583 kt15,658 kt
Stripping / waste ratio 4.17 2.21 0.91 1.5 1.2 0.9
Tonnes processed 2,693 kt8,837 kt17,874 kt17,253 kt21,880 kt22,110 kt21,089 kt
Daily mining rate 112 kt135 kt137 kt
Daily processing rate 47.1 kt59.9 kt60.6 kt

Reserves at June 30, 2021:
Lagunas Norte Mineral Resources are estimated at gold cut-off grades that vary by material type from 0.286 g/t to 0.387 g/t for heap leach processing, from 0.738 g/t to 0.966 g/t for CMOP processing, and from 0.880 g/t to 1.482 g/t for PMR processing.
Lagunas Norte Mineral Reserves are estimated at gold cut-off grades that vary by material type from 0.312 g/t to 0.422 g/t for Heap Leach processing, from 0.806 g/t to 1.087 g/t for CMOP processing, and from 0.960 g/t to 1.618 g/t for PMR processing.

Lagunas Norte Mineral Reserves are estimated at gold cut-off grades that vary by material type from 0.312 g/t to 0.422 g/t for Heap Leach processing, from 0.806 g/t to 1.087 g/t for CMOP processing, and from 0.960 g/t to 1.618 g/t for PMR processing.

The Mineral Reserve estimate includes stockpile inventory as of June 30, 2021.

CategoryTonnage CommodityGradeContained Metal
Proven 21,467 kt Gold 2.52 g/t 1,738 koz
Proven 21,467 kt Silver 6.07 g/t 4,190 koz
Probable 27,936 kt Gold 2.47 g/t 2,214 koz
Probable 27,936 kt Silver 6.37 g/t 5,726 koz
Proven & Probable 49,404 kt Gold 2.49 g/t 3,952 koz
Proven & Probable 49,404 kt Silver 6.24 g/t 9,916 koz
Measured 1,749 kt Gold 0.8 g/t 45 koz
Measured 1,749 kt Silver 2.82 g/t 158 koz
Indicated 23,901 kt Gold 0.8 g/t 618 koz
Indicated 23,901 kt Silver 2.64 g/t 2,027 koz
Measured & Indicated 25,650 kt Gold 0.8 g/t 663 koz
Measured & Indicated 25,650 kt Silver 2.65 g/t 2,186 koz
Inferred 2,432 kt Gold 0.9 g/t 70 koz
Inferred 2,432 kt Silver 3.15 g/t 246 koz

Commodity Production Costs:

CommodityUnits201920182017201620152014
Cash costs Gold USD 499 / oz 446 / oz 423 / oz 361 / oz 403 / oz
Cash costs Gold USD  ......  Subscription required† 448 / oz† 405 / oz† 383 / oz† 329 / oz† 379 / oz†
Total cash costs Gold USD  ......  Subscription required
Total cash costs Gold USD  ......  Subscription required†
All-in sustaining costs (AISC) Gold USD  ......  Subscription required 687 / oz 524 / oz 569 / oz 541 / oz 567 / oz
All-in sustaining costs (AISC) Gold USD  ......  Subscription required† 636 / oz† 483 / oz† 529 / oz† 509 / oz† 543 / oz†
All-in costs Gold USD  ......  Subscription required 696 / oz 538 / oz 580 / oz 541 / oz 567 / oz
All-in costs Gold USD  ......  Subscription required† 644 / oz† 497 / oz† 540 / oz† 509 / oz† 543 / 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:

Units20192018201720162015
Capital expenditures M USD  ......  Subscription required22   25   56   67  
Sustaining costs M USD 20   20   51   67  
Revenue M USD 332   514   548   673  
EBITDA M USD 33   327   356   454  


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

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Dec 29, 2021
....................... Subscription required ....................... Subscription required Subscription required Dec 29, 2021
....................... Subscription required ....................... Subscription required Subscription required Dec 29, 2021
....................... Subscription required ....................... Subscription required Subscription required Dec 29, 2021
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2016

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Other 2018
Press Release 2018
Quarterly Report 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
Boroo completes acquisition of Lagunas Norte mine June 1, 2021
Barrick Reaches Agreement to Sell the Lagunas Norte Mine February 16, 2021

Aerial view:

Subscription required - Subscription is required.

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