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Peru
Yauricocha Mine (Yauricocha Expansion Project)

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 Location:
64 km SW from Jauja, Peru

  Regional Office:
Av. Pedro de Osma 450 Barranco
Lima
Peru
Phone  ...  Subscription required
Fax+51-1-467-2865
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Silver
  • Lead
  • Zinc
  • Copper
  • Gold
Mining Method
  • Overhand Cut & Fill
  • Sub-level caving
Processing
  • Filter press plant
  • Dewatering
  • Flotation
  • X-Ray sorting
Mine Life11 years (as of Jan 1, 2021)
Latest NewsSierra Metals Announces New High-Grade Zone Discovery at Its Yauricocha Mine in Peru     April 28, 2022


Owners

Source: p. 39
CompanyInterestOwnership
Sierra Metals Inc. 81.84 % Indirect
Sociedad Minera Corona, SA (operator) 100 % Direct
Ownership Tree
The Company, through its wholly owned subsidiary Dia Bras Peru, holds an 81.84% interest in Corona, which represents 92.33% of the voting shares.

Deposit Type

  • Breccia pipe / Stockwork
  • Carbonate replacement
  • Hydrothermal


Summary:

The Yauricocha Mine features several mineralized bodies, which have been emplaced along structural trends, with the mineralization itself related to replacement of limestones by hydrothermal fluids related to nearby intrusions. The mineralization varies widely in morphology, from large, relatively wide, tabular manto-style deposits to narrow, sub-vertical chimneys. The mineralization features economic grades of Ag, Cu, Pb and Zn, with local Au to a lesser degree. The majority of the deposits are related to the regional high-angle NW-trending Yauricocha fault or the NE-trending and less well-defined Cachi-Cachi structural trend. The mineralization generally presents as polymetallic sulfides but is locally oxidized to significant depths or related to more Cu-rich bodies.

Goyllarisquizga Formation
The oldest rocks exposed in the area are the lower Cretaceous Goyllarisquizga arenites. This formation is approximately 300 m thick and comprises thick gray and white arenites, locally banded with carbonaceous lutites as well as small mantos of low-quality coal beds and clay. In the vicinity of Chaucha, these arenites have near their base interbedded, red lutite. The arenites crop out in the cores of the anticlines southwest of Yauricocha, as beds dispersed along the Chacras uplift, and isolated outcrops in the Éxito zone.

Jumasha Formation
The mid-Cretaceous Jumasha Formation consists of massive gray limestone, averages 700 m thick, and concordantly overlies the Goyllarisquizga Formation. Intercalations of carbonaceous lutites occur at its base near the contact with the arenites. These layers are succeeded by discontinuous lenses of maroon and grey limestone, occasionally with horizons of lutite and chert about 6 m thick. Also present are pseudo-breccias of probable sedimentary origin and a basaltic sill.

Celendín Formation
The Celendín Formation concordantly overlies the Jumasha Formation and contains finely stratified silicic lutites with intercalations of recrystallized limestone of Santoniana age as well as the France Chert. The average thickness in the Yauricocha area is 400 m.

Casapalca Red Beds
The Casapalca red beds lay concordantly on the Celendín Formation with a gradational contact. It has been assigned an age between upper Cretaceous and lower Tertiary, but because of the absence of fossils its age cannot be precisely determined. It is composed primarily of calcareous red lutites, pure limestones, and reddish arenaceous limestone. Lava flows and tuffaceous beds have been occasionally reported.

Mineralization at the Yauricocha Mine is represented by variably oxidized portions of a multiplephase polymetallic system with at least two stages of mineralization, demonstrated by sulfide veins cutting brecciated polymetallic sulfide mineralized bodies. The mineralized bodies and quartzsulfide veins appear to be intimately related and form a very important structural/mineralogical assemblage in the Yauricocha mineral deposit. Comments made herein regarding the characteristics of the Yauricocha district apply directly to the Yauricocha Mine.

Mineralization in the Yauricocha district is spatially and genetically related to the Yauricocha stock, a composite intrusive body of granodioritic to quartz monzonitic composition that has been radiometrically dated at late Miocene (approximately 7.5 million years old) (Giletti and Day, 1968). The stock intrudes tightly folded beds of the late Cretaceous Jumasha and Celendín Formations and the overlying Casapalca Formation (latest Cretaceous and Paleocene?). Mineralized bodies are dominantly high-temperature polymetallic sulfide bodies that replaced limestone. Metal-bearing solutions of the Yauricocha magmatic-hydrothermal system were highly reactive and intensely attacked the carbonate wall rock of the Jumasha and Celendín Formations, producing the channels in which sulfides were deposited.


Mining Methods

  • Overhand Cut & Fill
  • Sub-level caving


Summary:

The Yauricocha Mine is a producing operation with a long production history. Most of the mining is executed through mechanized sub-level caving with a relatively small portion of the mining using overhand cut and fill. The mine uses well-established, proven mining methods and is planning to increase the production rate to 5,500 tpd (2.0 Mt/y) in 2024.

Mechanized sub-level caving (SLC) and overhand mechanized cut and fill (MCF) mining methods are currently used in the mine to achieve production with most of the production by SLC mining methods.SLC is the primary mining method at Yauricocha, representing 84% of the annual production.

SLC mining areas have historically been established by developing three sub-levels for each 50m main level via ramps. This results in a planned 16.7 m sub-level spacing which are called pisos (floors). Below the 1070L, main level spacing will be increased to 100m, but the sub-level spacing remains the same. One aspect of modernizing the SLC practices will be to work towards increasing the sub-level spacing to 25 m which is typical of modern SLC mines. Geotechnical work and trial mining will be conducted as part of the program to phase in this change. Not all mineralized bodies will necessarily be converted due to geotechnical constraints.

On each sub-level, drawpoints are developed from the footwall to the hangingwall of the mineralized body, typically at 3.5 m wide x 3.0 m high and are spaced 8.0 m apart along the Footwall drift. Steel sets, shotcrete and bolting are used as ground support in the drawpoints and the length of each drawpoint varies with the thickness of the mineralized zone.

As the drawpoint is developed, samples of mineralized material are collected for grade control analysis from the left and right ribs. Upholes are drilled and blasted in stopes to initiate caving. Effective draw control is an important aspect to successfully extracting the expected tonnes and grades for this mining method. Drawpoints are staggered by 4.0 m horizontally between sub-levels.

MCF mining is employed in the smaller mineralized bodies. Typically, the 3.0 m high cuts are mined at a minimum width of 3.0 m in a bottom-up sequence (overhand) where the previous cut is filled with uncemented rock fill (URF) as mining progresses to the next sub-level above. Sill pillars are left between levels as mining comes up underneath the previously mined level. Based on geotechnical constraints, the sill pillars are typically a minimum of 2.0 m in thickness.


Crushing and Grinding
Flow Sheet: Source
Crusher / Mill TypeModelSizePowerQuantity
Jaw crusher 10" x 24" 45 kW 1
Jaw crusher 24" x 36" 45 kW 1
Cone crusher 4' 75 kW 1
Ball mill 5' x 6' 63 kW 1
Ball mill 8' x 10' 360 kW 1
Ball mill 8' x 6' 186 kW 3
Rod mill 7' x 12' 360 kW 1
Rod mill 7' x 12' 186 kW 1

Summary:

Mine trucks deliver polymetallic mineralized material and oxide mineralized material to their respective coarse mineralized material bins. The single crushing plant batches mineralized material that is delivered to dedicated mineralized material bins to each processing line. Each process line includes a grinding stage.


Processing

  • Filter press plant
  • Dewatering
  • Flotation
  • X-Ray sorting

Flow Sheet: Subscription required

Summary:

Yauricocha operates a conventional, multi-stage differential flotation plant that includes two parallel processing circuits, one to process polymetallic mineralized material, and the second to process oxide mineralized material. Each processing circuit consists of a crushing stage, grinding, sequential differential flotation, dewatering of the concentrates, thickening and disposal of the flotation tails.

Yauricocha’s original combined capacity of the two processing circuits totals 3,600 tonnes per day. The polymetallic circuits nominal capacity has historically been 3,000 tonnes per day and the oxide circuit 600 tonnes per day, however ongoing improvements to the circuits have been increasing daily throughput.

No oxide mineralized material has been processed since 2018 and current plant production includes only three mineral concentrates: lead sulfides concentrate, copper sulfides concentrate, and zinc concentrate.

Recent improvements to the processing ........

Recoveries & Grades:

CommodityParameter2021202020192018201720162015
Silver Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required72.974.865.365.2
Silver Head Grade, g/t  ......  Subscription required  ......  Subscription required  ......  Subscription required60.367.197.7102.62
Lead Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required83.883.673.173.3
Lead Head Grade, %  ......  Subscription required  ......  Subscription required  ......  Subscription required1.31.482.522.93
Zinc Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required88.789.187.289.4
Zinc Head Grade, %  ......  Subscription required  ......  Subscription required  ......  Subscription required3.553.743.182.57
Copper Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required70.865.559.361.7
Copper Head Grade, %  ......  Subscription required  ......  Subscription required  ......  Subscription required0.970.790.540.49
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required16.616.325.226.7
Gold Head Grade, g/t  ......  Subscription required  ......  Subscription required  ......  Subscription required0.580.540.640.7

Production:

CommodityUnits2022202120202019201820172016
Copper Equivalent k lbs  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required50,903
Silver koz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Lead k lbs  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Zinc k lbs  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Copper k lbs  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Zinc Equivalent k lbs  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Equivalent koz  ......  Subscription required
All production numbers are expressed as metal in concentrate. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202120202019201820172016
Tonnes processed  ......  Subscription required  ......  Subscription required1,116,919 t1,106,649 t1,023,491 t897,169 t
Daily processing capacity  ......  Subscription required  ......  Subscription required3,150 t3,150 t3,000 t2,800 t
Daily processing rate  ......  Subscription required  ......  Subscription required3,191 t3,162 t2,924 t2,563 t
Subscription required - Subscription is required.

Reserves at December 31, 2021:

CategoryTonnage CommodityGradeContained Metal
Measured 3,776 kt Silver 61 g/t 7 M oz
Measured 3,776 kt Lead 0.9 % 75 M lbs
Measured 3,776 kt Zinc 2.57 % 214 M lbs
Measured 3,776 kt Copper 1.11 % 93 M lbs
Measured 3,776 kt Gold 0.59 g/t 72 koz
Measured 3,776 kt Zinc Equivalent 6.78 % 564 M lbs
Indicated 9,604 kt Silver 39 g/t 12 M oz
Indicated 9,604 kt Lead 0.53 % 113 M lbs
Indicated 9,604 kt Zinc 1.97 % 417 M lbs
Indicated 9,604 kt Copper 1.23 % 260 M lbs
Indicated 9,604 kt Gold 0.5 g/t 154 koz
Indicated 9,604 kt Zinc Equivalent 5.77 % 1,222 M lbs
Measured & Indicated 13,379 kt Silver 45 g/t 19 M oz
Measured & Indicated 13,379 kt Lead 0.64 % 187 M lbs
Measured & Indicated 13,379 kt Zinc 2.14 % 632 M lbs
Measured & Indicated 13,379 kt Copper 1.19 % 353 M lbs
Measured & Indicated 13,379 kt Gold 0.52 g/t 225 koz
Measured & Indicated 13,379 kt Zinc Equivalent 6.05 g/t 1,786 M lbs
Inferred 11,566 kt Silver 29 g/t 11 M oz
Inferred 11,566 kt Lead 0.32 % 83 M lbs
Inferred 11,566 kt Zinc 1.03 % 262 M lbs
Inferred 11,566 kt Copper 1.4 % 358 M lbs
Inferred 11,566 kt Gold 0.44 g/t 162 koz
Inferred 11,566 kt Zinc Equivalent 4.87 % 1,242 M lbs

Commodity Production Costs:

CommodityUnits2021202020192018201720162015
Cash costs (sold) Copper Equivalent USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 1.18 / lb 1.07 / lb 0.98 / lb 1.13 / lb
Cash costs (sold) Zinc Equivalent USD  ......  Subscription required  ......  Subscription required 0.52 / oz 0.5 / lb 0.42 / lb
Cash costs (sold) Silver Equivalent USD  ......  Subscription required  ......  Subscription required 6.22 / oz 6.51 / oz 7.77 / oz 7.54 / oz
All-in sustaining costs (sold) Copper Equivalent USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 1.66 / lb 1.66 / lb 1.65 / lb 2.13 / lb
All-in sustaining costs (sold) Zinc Equivalent USD  ......  Subscription required  ......  Subscription required 0.73 / lb 0.78 / lb 0.71 / lb
All-in sustaining costs (sold) Silver Equivalent USD  ......  Subscription required  ......  Subscription required 8.77 / oz 10.1 / oz 13.1 / oz 14.2 / oz
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operating Costs:

Units20212020201920182017201620152014
Total operating costs ($/t milled) USD 61.557.670.963.262.455.852.746.6

Financials:

Units2022202120202019201820172016
Capital expenditures (planned) M USD  ......  Subscription required
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required7.2   11.6   7.4  
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required25.2   18.7   11.6  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required168.7   154.2   97.3  
Gross profit M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required76.1   42.4   11.4  
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required34.9   18  
EBITDA M USD  ......  Subscription required79.5   74.8   34.3  
Subscription required - Subscription is required


Heavy Mobile Equipment as of March 31, 2021:
HME TypeSizeQuantity
Backhoe ....................... Subscription required
Bolter ....................... Subscription required
Drill ....................... Subscription required
Drill ....................... Subscription required
Drill (long hole) ....................... Subscription required
Grader ....................... Subscription required
Loader ....................... Subscription required
Load-Haul-Dump (LHD) ....................... Subscription required
Load-Haul-Dump (LHD) ....................... Subscription required
Personnel Carrier ....................... Subscription required
Shotcreter ....................... Subscription required
Trans Mixer 4.5 cu. m ....................... Subscription required
Truck (dump) 15 t ....................... Subscription required
Truck (dump) 20 t ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 4, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 4, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 4, 2022
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2021
Subscription required Subscription required Subscription required 2020
Subscription required Subscription required Subscription required 2019
Subscription required Subscription required Subscription required 2017
Subscription required Subscription required Subscription required 2016
Subscription required 2015

Corporate Filings & Presentations:

DocumentYear
Press Release 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Corporate Presentation 2018
Management Discussion & Analysis 2018
Preliminary Economic Assessment 2018
Press Release 2018
Corporate Presentation 2017
Management Discussion & Analysis 2017
Press Release 2017
Technical Report 2017
Annual Information Form 2016
Corporate Presentation 2016
Corporate Presentation 2016
Management Discussion & Analysis 2016
Press Release 2016
Technical Report 2016
Management Discussion & Analysis 2015
Press Release 2015
Management Discussion & Analysis 2014
Technical Report 2014
Subscription required - Subscription is required.

News:

NewsDate
Sierra Metals Announces New High-Grade Zone Discovery at Its Yauricocha Mine in Peru April 28, 2022
Sierra Metals Reports Q4-2021 Financial Results at Its Sociedad Minera Corona Subsidiary in Peru February 16, 2022
Sierra Metals Discovers New High-Grade Oxide Zone Located Within the Current Mine Operations Area at the Yauricocha Mine, Peru April 13, 2021
Sierra Metals Announces Filing of NI 43-101 Preliminary Economic Assessment Technical Report for the Yauricocha Mine Including a 7.8% Improved After Tax NPV of US$359 Million... December 8, 2020
Sierra Metals Announces Large Increase in Mineral Resource Tonnage at Its Yauricocha Mine in Peru and Positive Preliminary Economic Assessment... November 18, 2020
Sierra Metals Restarting Operations in Peru and Prepares to Ramp up to Full Capacity June 5, 2020
Sierra Metals Announces 13-day Extension to the Suspension of Its Yauricocha Mining Operations in Accordance With the Government Extension of Its Declaration of a State of Emergency to Contain the Advancement of the COVID-19 Virus in Peru March 27, 2020
Sierra Metals Announces a Temporary 15-Day Suspension of Its Yauricocha Mining Operations in Accordance With the Government Declaration... March 17, 2020
Sierra Metals Announces Filing of NI 43-101 Technical Report on Reserves and Resources for the Yauricocha Mine in Peru February 3, 2020
Sierra Metals Updates the Mineral Reserve and Resource Estimate for Its Yauricocha Mine, Peru December 19, 2019
Sierra Metals Receives Approval for Yauricocha Mine Environmental Impact Assessment for the Expansion of the Tailings Deposition Facility February 13, 2019
Sierra Metals announces positive PEA results for a 66% output expansion at its Yauricocha Mine in Peru June 28, 2018
Sierra Metals announces strike action from a fraction of workers at the Yauricocha Mine, Peru March 16, 2018

Aerial view:

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