Peru

Magistral Project

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Categories

Overview

Mine TypeOpen Pit
StagePermitting
Commodities
  • Copper
  • Silver
  • Molybdenum
Mining Method
  • Truck & Shovel / Loader
Mine Life... Lock
ShapshotThe feasibility study of the Magistral project was conducted in 2022.

An amendment to the Environmental Impact Assessment (EIA) was submitted to the Ministry of the Environment (SENACE) in the fourth quarter of 2021 for its assessment. In October 2023, Nexa responded to SENACE inquiries. The amendment to the EIA is in the final approval stage and a decision is expected in 2024.

Owners

SourceSource
CompanyInterestOwnership
Nexa Resources S.A. 83.48 % Indirect
Nexa Resources S.A. owns a total of 83.48% in the Magistral Property that corresponds to the sum of Nexa’s direct interest in Nexa Perú (0.18%) and Nexa’s indirect interest in Nexa Perú (83.37%) through its controlled company Nexa Resources Cajamarquilla S.A. (99.92%). Nexa Perú holds 15 of the 36 mineral concessions and Compañia Magistral S.A.C, a company which according to Nexa is 100% controlled directly or indirectly by Nexa Perú, holds 21 of the 36 mineral concessions.

Contractors

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Deposit type

  • Skarn
  • Porphyry

Summary:

The Magistral deposit is a calc-alkaline, copper-molybdenum, porphyry deposit with a well developed envelope of copper-(molybdenum) mineralized skarn (Ristorcelli et al., 2008).

There are three types of mineralization at the Project:
• Skarn: The skarn mineralization is of highest grade, forming a hundred-metre scale rim within the country rocks around the porphyries. Garnet (grossular at proximal and andradite at distal alterations), epidote, chlorite, hematite, magnetite, quartz and inosilicate minerals (pyroxene and amphibole) form the skarn gangue mineralogical assemblage. Centimetre-scale mineralized veinlets and massive patches of sulphide (chalcopyrite, pyrrhotite, pyrite, and minor molybdenite) crosscut the skarn gangue assemblage.

• Mixed zone: It consists of a metre-scale interlayering between the skarn and the porphyry style mineralization. It is possibly formed by the combination of exoskarn, endoskarn, and also intrusive fingers (porphyry), making a complex and variable sort of mineralization that combines mineralogical and grade characteristics of skarn and porphyry mineralization.

• Porphyry: The porphyry mineralization is of lowest grade and is formed by several quartz, chalcopyrite, and molybdenite veinlets (“D”, “B”, and “A”-type veinlets), which constitute a final stockwork framework that crosscuts the intrusive porphyry. The skarn mineralization seems to be preferentially elongated and anisotropic parallel to the strata bedding of country rocks (limestone), whereas the porphyry mineralization envelope is coincident with the limits of the San Ernesto and H porphyry intrusives, whose texture, grade, and mineralogy are apparently more isotropic than those of skarn mineralization.

The skarn mineralization seems to be preferentially elongated and anisotropic parallel to the strata bedding of country rocks (limestone), whereas the porphyry mineralization envelope is coincident with the limits of the San Ernesto and H porphyry intrusives, whose texture, grade, and mineralogy are apparently more isotropic than those of skarn mineralization.

Reserves

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Mining Methods

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Comminution

Crushers and Mills

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Processing

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Production

CommodityProductUnitsLOM
Copper Metal in copper conc. M lbs 1,377
Copper Concentrate kt 2,498
Silver Metal in copper conc. oz 8,245,543
Molybdenum Metal in concentrate M lbs 106
Molybdenum Concentrate kt 87

Operational metrics

Metrics
Daily ore mining rate 30,000 t *
Daily mining rate 62,127 t *
Daily milling rate 24,868 t *
Daily milling capacity 30,000 t *
Annual ore mining rate 10.8 Mt *
Stripping / waste ratio 1.5 *
Waste tonnes, LOM 233,501 kt *
Ore tonnes mined, LOM 155,846 kt *
Total tonnes mined, LOM 389,347 kt *
Tonnes milled, LOM 155,846 kt *
* According to 2017 study.

Production Costs

CommodityUnitsAverage
Assumed price Molybdenum USD 7.48 / lb *  
Assumed price Copper USD 2.74 / lb *  
Assumed price Silver USD 18.9 / oz *  
* According to 2017 study / presentation.

Operating Costs

Currency2017
OP mining costs ($/t mined) USD 1.7 *  
OP mining costs ($/t milled) USD  ....  Subscribe
Processing costs ($/t milled) USD  ....  Subscribe
G&A ($/t milled) USD  ....  Subscribe
Total operating costs ($/t milled) USD  ....  Subscribe
* According to 2017 study.

Project Costs

MetricsUnitsLOM Total
Initial CapEx $M USD  ......  Subscribe
Sustaining CapEx $M USD  ......  Subscribe
Closure costs $M USD  ......  Subscribe
Total CapEx $M USD  ......  Subscribe
OP OpEx $M USD  ......  Subscribe
Processing OpEx $M USD 641.5
G&A costs $M USD 144.9
Total OpEx $M USD  ......  Subscribe
Total Taxes $M USD  ......  Subscribe
Gross revenue (LOM) $M USD  ......  Subscribe
Net revenue (LOM) $M USD  ......  Subscribe
Net Operating Income (LOM) $M USD  ......  Subscribe
Pre-tax Cash Flow (LOM) $M USD  ......  Subscribe
After-tax Cash Flow (LOM) $M USD  ......  Subscribe
Pre-tax NPV @ 5% $M USD  ......  Subscribe
Pre-tax NPV @ 10% $M USD  ......  Subscribe
After-tax NPV @ 5% $M USD  ......  Subscribe
After-tax NPV @ 10% $M USD  ......  Subscribe
Pre-tax IRR, %  ......  Subscribe
After-tax IRR, %  ......  Subscribe
Pre-tax payback period, years  ......  Subscribe

Heavy Mobile Equipment

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Personnel

Mine Management

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jun 30, 2017
....................... Subscription required ....................... Subscription required Subscription required Jun 30, 2017
....................... Subscription required ....................... Subscription required Subscription required Apr 10, 2024

EmployeesContractorsTotal WorkforceYear
...... Subscription required ...... Subscription required ...... Subscription required 2017

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