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Brazil
Morro Agudo Mine

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 Location:
32km S from Paracatu, Brazil
  Address:
Unidade Morro Agudo, s/n° - Zona Rural - Cx. Postal 55
Paracatu
Brazil
38600-000
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  • Overview
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  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
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  • Filings & News
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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Zinc
  • Lead
  • Silver
Mining Method
  • Room-and-pillar
  • Backfill
Production Start...
Mine Life17 years (as of Jan 1, 2022)
The Bonsucesso project is a brownfield underground mine project that belongs to the Morro Agudo complex (Ambrosia Trend) and is expected to extend the LOM of the Morro Agudo complex.The run-of-mine of Bonsucesso will feed the Morro Agudo processing plant.

The feasibility study was resumed in 2021 and it was concluded in 2022. The mine will be treated as a satellite mine for the Morro Agudo complex.

In 2020, the project obtained the environmental approval for the installation phase.

Owners

Source: p. 56,530
CompanyInterestOwnership
Nexa Resources S.A. 100 % Indirect
Nexa Recursos Minerais S.A. (previously known as Votorantim Metais Zinco S.A.), which is wholly owned by Nexa Resources S.A., owns 100.0% of the Morro Agudo project.

Contractors

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Deposit Type

  • Mississippi Valley Type
  • Carbonate hosted

Summary:

The mineralization at Morro Agudo and the Ambrosia Trend are considered to be examples of Irish-type Zn-Pb deposits hosted by carbonate rocks which are a subclass of Mississippi Valley Type deposits.

MORRO AGUDO MINE
The Morro Agudo zinc and lead deposit comprises a number of concordant stratabound sulphide bodies, non-concordant remobilized sulphide bodies, and intraformational dolarenites and breccias of the Morro do Calcário Formation.

Mineralization
The combined length of the known mineralized bodies is approximately 1,700 m, the width is about 1,200 m, and the bodies have a variable thickness with a maximum of about 10 m. Mineralization is bounded to the northwest by the Main Fault. The western limit has not yet been defined, but drilling has shown continuity of mineralization at depth. Drilling deeper than 1,000 m has shown continuity of mineralization at depth, but with thinner intercepts (1 to 5 m) and lower grades.

The mineralized bodies are separated from each other by waste intervals of stratified dolarenites at upper and intermediate levels, and by waste breccias at lower levels. Sulphide levels occur as concordant stratabound lenses in dolarenite, and subordinately in dolomitic and dolarenitic breccias, in addition to occurring as late tectonic structure fill (faults/fractures). These sulphide lenses are typically less than 4 m thick, and separated by barren intervals that range from a few centimetres to several metre ........

Mining Methods

  • Room-and-pillar
  • Backfill

Summary:

The LOM is based on mill feed material including Inferred Mineral Resources to be sourced from the operating underground Morro Agudo Mine and Bonsucesso deposits that are assumed to be mined using underground mining methods.

The open pit Ambrosia Sul mine in Morro Agudo reached the end of its life of mine during the fourth quarter of 2020 and operations were suspended due to the uncertainties associated with the geological model of the area, safety considerations and a greater movement of ore compared to the original plan. Due to the mine closure, Nexa reviewed Ambrosia’s portfolio of assets and analyzed the possibility of using these assets in other operations, such as the Bonsucesso mine, which is currently in the feasibility study phase.

Morro Agudo Mine
The primary extraction method at the Morro Agudo Mine is inclined room-and-pillar. The mineralized zones are accessed via a ramp system. Backfill is in limited use at the Morro Agudo Mine and is specified on an operational basis depending upon the deposit geometry.

The Morro Agudo Mine is a mature operation, and staff has a well-developed understanding of the hydrogeology, geology, and mining methods required to safely extract the mineralization. Development and access profiles take advantage of the known hanging wall structural characteristics to minimize ground support requirements. Water inflows into the Morro Agudo Mine are not a major source of water volume to the mine.

Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.

Production:

CommodityProductUnits2023202220212020201920182017
Zinc Metal in concentrate t  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required26,40820,969
Lead Metal in concentrate t  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Zinc Equivalent Metal in concentrate t  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Metal in concentrate oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Zinc Concentrate kt 6553
Lead Concentrate kt  ......  Subscription required  ......  Subscription required
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202220212020201920182017
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required1,046 kt1,009 kt1,059 kt
Tonnes processed  ......  Subscription required  ......  Subscription required  ......  Subscription required1,168,396 t1,060,930 t1,054,692 t
Daily processing capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required3,400 t3,400 t3,400 t
Waste  ......  Subscription required  ......  Subscription required  ......  Subscription required1,477 kt2,827 kt2,148 kt
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Reserves at December 31, 2022:
Mineral Resources are reported using a NSR cut-of value of based on the LOM costs for Morro Agudo: US$ 52.43/t and Bonsucesso: US$ 55.85/t. The NSR cut-offs are calculated based on an average long-term metal price of Zn: US$ 3,250.3/t (US$ 1.47/lb) and Pb: US$ 2,350.5/t (US$ 1.07/lb).

CategoryTonnage CommodityGradeContained Metal
Indicated 12.8 Mt Zinc 3.52 % 450.6 kt
Indicated 12.8 Mt Lead 0.58 % 74.5 kt
Inferred 4.07 Mt Zinc 3.9 % 158.7 kt
Inferred 4.07 Mt Lead 0.57 % 23.1 kt

Commodity Production Costs:

CommodityUnits2023202220212020201920182017
Cash costs (sold) Zinc USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 0.62 / lb†   0.75 / lb†  
^ Guidance / Forecast.
† Net of By-Product.
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Operating Costs:

Units20222021
Total operating costs ($/t milled) USD 42.633.1

Financials:

Units2023202220212020201920182017
Capital expenditures (planned) M USD  ......  Subscription required
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 12.3   7.9  
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 13.3   18.6  
Subscription required - Subscription is required

Water Supply
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Heavy Mobile Equipment as of July 25, 2017:
HME TypeModelSizeQuantityStatus
ANFO Loader ....................... Subscription required ....................... Subscription required Proposed
Bolter ....................... Subscription required ....................... Subscription required Existing
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed
Excavator ....................... Subscription required ....................... Subscription required Existing
Grader ....................... Subscription required ....................... Subscription required Existing
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed
Jumbo ....................... Subscription required ....................... Subscription required Existing
Jumbo ....................... Subscription required ....................... Subscription required Existing
Jumbo ....................... Subscription required ....................... Subscription required Existing
Load-Haul-Dump (LHD) ....................... Subscription required 14 t ....................... Subscription required Existing
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed
Scaler ....................... Subscription required Existing
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed
Scissor Lift ....................... Subscription required ....................... Subscription required Existing
Scissor Lift ....................... Subscription required ....................... Subscription required Existing
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed
Truck (dump) ....................... Subscription required 28 t ....................... Subscription required Existing
Truck (haul) ....................... Subscription required Existing
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required May 25, 2023
....................... Subscription required ....................... Subscription required Subscription required May 25, 2023
....................... Subscription required ....................... Subscription required Subscription required May 25, 2023
....................... Subscription required ....................... Subscription required Subscription required May 25, 2023
....................... Subscription required ....................... Subscription required Subscription required May 25, 2023
....................... Subscription required ....................... Subscription required Subscription required May 25, 2023
Subscription required - Subscription is required.

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2023
Annual Review 2022
Form 20-F 2022
Press Release 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Form 20-F 2018
Quarterly Report 2018
Form 20-F 2017
Preliminary Economic Assessment 2017
Other 2007
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Subscription required - Subscription is required.

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