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Peru
Yauricocha Expansion Project (Yauricocha)

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 Location:
64 km SW from Jauja, Peru

  Project Contacts:
Av. Pedro de Osma 450 Barranco
Lima
Peru
15063
Phone  ...  Subscription required
Fax+51-1-467-2865
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  • Overview
  • Owners
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  • Mining
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  • Filings & News

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Overview

StageConstruction
Mine TypeUnderground
Commodities
  • Silver
  • Gold
  • Copper
  • Lead
  • Zinc
Mining Method
  • Overhand Cut & Fill
  • Sub-level caving
Production Start...
Mine Life11 years (as of Jan 1, 2021)
Sierra Metals Announces Large Increase in Mineral Resource Tonnage at its Yauricocha Mine in Peru and Positive Preliminary Economic Assessment for Increase in throughput to 5,500 Tonnes Per Day from Today’s permitted 3,150 Tonnes Per Day.


Owners

Source: p. 57
CompanyInterestOwnership
Sierra Metals Inc. 81.84 % Indirect
Sociedad Minera Corona, SA (operator) 100 % Direct
Ownership Tree
Sierra Metals retains a 100% controlling ownership status in the Yauricocha Mine, through their subsidiary Sociedad Minera Corona S.A. (SMCSA). An unnamed private interest holds 18.16% equity ownership in Yauricocha, with Sierra Metals holding the remaining 81.84%.

Contractors

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Deposit Type

  • Hydrothermal
  • Breccia pipe / Stockwork
  • Carbonate replacement


Summary:

The Yauricocha mine features several mineralized zones 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 mineralization is related to the regional high-angle NW-trending Yauricocha fault, or the NEtrending 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 mineralization.

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 conco ........


Mining Methods

  • Overhand Cut & Fill
  • Sub-level caving


Summary:

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. The mining method used varies depending on geotechnical constraints, mineralization trends, dimensions, and mine production targets.

The analysis determined that higher production rates are achievable through expansion of the use of the SLC mining method in the new production areas. Additionally, a new configuration of the SLC mining method will allow for a greater recovery of mining resources and increased productivity.

Current mine access includes two tunnels and three used for personnel access and materials movement:
• The Klepetko tunnel (3m x 3m) and the Yauricocha tunnel (3.5m x 3.5m) located at level 720 (Main transport level). These tunnels are used to delivered mineralized material directly to the Chumpe concentrator plant and also provide mine access for personnel.
• The shafts currently in service are the Central shaft, Mascota shaft and the Cachi-Cachi shaft.
• These shafts are typically used to move personnel and materials, as well as moving mineralized material and waste up to the 720-haulage level. They can move mineralized material and waste to surface if required.
• The Yauricocha shaft is currently being sunk to the 1270 level and is expected to be commissioned in 2025.

For mining between the 1170 level to 1270 l ........


Crushing and Grinding
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Processing

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Summary:

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Projected Production:
Sierra has decided that the 5,500 tpd production rate option is the recommended case for a future pre-feasibility study. Increased production rates beyond 5,500 tpd may be possible once Yauricocha has resolved the mineralized material and waste haulage issues.

CommodityUnitsLOM
Silver M oz 11
Gold koz  ......  Subscription required
Copper M lbs  ......  Subscription required
Lead M lbs  ......  Subscription required
Zinc M lbs  ......  Subscription required
All production numbers are expressed as payable metal.

Operational Metrics:

Metrics
Daily milling capacity  ......  Subscription required
Daily ore mining rate  ......  Subscription required
Waste tonnes, LOM  ......  Subscription required
Ore tonnes mined, LOM  ......  Subscription required
Annual milling capacity  ......  Subscription required
Annual ore mining rate  ......  Subscription required
* According to 2021 study.
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 Gold 0.59 g/t 72 koz
Measured 3,776 kt Copper 1.11 % 93 M lbs
Measured 3,776 kt Lead 0.9 % 75 M lbs
Measured 3,776 kt Zinc 2.57 % 214 M lbs
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 Gold 0.5 g/t 154 koz
Indicated 9,604 kt Copper 1.23 % 260 M lbs
Indicated 9,604 kt Lead 0.53 % 113 M lbs
Indicated 9,604 kt Zinc 1.97 % 417 M lbs
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 Gold 0.52 g/t 225 koz
Measured & Indicated 13,379 kt Copper 1.19 % 353 M lbs
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 Zinc Equivalent 6.05 % 1,786 M lbs
Inferred 11,566 kt Silver 29 g/t 11 M oz
Inferred 11,566 kt Gold 0.44 g/t 162 koz
Inferred 11,566 kt Copper 1.4 % 358 M lbs
Inferred 11,566 kt Lead 0.32 % 83 M lbs
Inferred 11,566 kt Zinc 1.03 % 262 M lbs
Inferred 11,566 kt Zinc Equivalent 4.87 % 1,242 M lbs

Commodity Production Costs:

CommodityUnitsAverage
Cash costs Copper Equivalent USD  ......  Subscription required&nbs
Assumed price Lead USD  ......  Subscription required&nbs
Assumed price Zinc USD  ......  Subscription required&nbs
Assumed price Copper USD  ......  Subscription required&nbs
Assumed price Silver USD  ......  Subscription required&nbs
Assumed price Gold USD  ......  Subscription required&nbs
* According to 2021 study / presentation.
Subscription required - Subscription is required.

Operating Costs:

Units2021
UG mining costs ($/t milled) USD 29.9 *
Processing costs ($/t milled) USD  ......  Subscription required
G&A ($/t milled) USD  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required
* According to 2021 study.
Subscription required - Subscription is required.

2021 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Expansion CapEx $M USD  ......  Subscription required
Sustaining CapEx $M USD  ......  Subscription required
Total CapEx $M USD  ......  Subscription required
UG OpEx $M USD  ......  Subscription required
Processing OpEx $M USD 151.8
G&A costs $M USD 93.7
Total OpEx $M USD  ......  Subscription required
Income Taxes $M USD  ......  Subscription required
Royalty payments $M USD  ......  Subscription required
Gross revenue (LOM) $M USD  ......  Subscription required
Net revenue (LOM) $M USD  ......  Subscription required
EBITDA (LOM) $M USD  ......  Subscription required
Pre-tax Cash Flow (LOM) $M USD  ......  Subscription required
After-tax Cash Flow (LOM) $M USD  ......  Subscription required
After-tax NPV @ 5% $M USD  ......  Subscription required
After-tax NPV @ 10% $M USD  ......  Subscription required
After-tax NPV @ 8% $M USD  ......  Subscription required
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Proposed Heavy Mobile Equipment as of March 31, 2021:
HME TypeSizeQuantity
Drill (long hole) ....................... Subscription required
....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Mar 31, 2021
....................... Subscription required ....................... Subscription required Subscription required Aug 13, 2022
....................... Subscription required ....................... Subscription required Subscription required Aug 13, 2022
....................... Subscription required ....................... Subscription required Subscription required Aug 13, 2022
Subscription required - Subscription is required.

Staff:

EmployeesYear
Subscription required 2021

Corporate Filings & Presentations:

DocumentYear
Preliminary Economic Assessment 2022
Press Release 2022
................................... Subscription required 2020
................................... Subscription required 2020
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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