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Brazil
Grota do Cirilo Phase 2 - Barreiro Project (Grota do Cirilo Phase 1 - Xuxa Project)

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 Location:
18 km NE from Araçuaí, Brazil

  Project Contacts:
Avenida Nove de Julho 4939, 9th Floor Torre Europa, Itaim
São Paulo
Brazil
01407-200
Phone  ...  Subscription required
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StagePermitting
Mine TypeOpen Pit
Commodities
  • Lithium
Mining Method
  • Truck & Shovel / Loader
Mine Life11.8 years (as of Jan 1, 2022)
Latest NewsSigma Lithium Files Ni 43-101 Technical Report For Production Expansion Supporting The Previously Announced 60% Increase In Mineral Reserves And US$ 15.3 Billion NPV     January 19, 2023


Owners

Source: p. 24
CompanyInterestOwnership
Sigma Lithium Resources Corp. 100 % Indirect
Sigma Mineração S.A. (SMSA) is the Brazilian subsidiary of Sigma and is the owner of the mining rights and the holder of mining concessions ordinance which includes the Xuxa, Barrerio, Murial, Lavra do Meio and Nezinho do Chicao deposits.

Contractors

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Deposit Type

  • Pegmatite


Summary:

The Barreiro pegmatite body is emplaced into biotite–quartz schist. Pale greenish–grey coloured, multicentimetre-sized microcrystalline quartz–feldspar intercalations have been noted in the schist, with disseminated green, sub- to one-millimetre-sized amphibole and pink garnet crystals. Pegmatite xenoliths can be found within 3 m of the dike edge within the schist and can range from a centimetre to as much as a metre in size.

The pegmatite strikes northeast–southwest and dips to the southeast at 30–35º. Based on drill data, the dike is about 600 m long, 800 m wide, and has an average thickness of 30–35 m. It remains open to the northeast and at depth. The deepest drill hole reached 374 m. The pegmatite is apparently intruded discordant to the host crenulated biotite schist in surface exposures, but at depth, can be concordant, and emplacement may be related to local fracturing.

The dike is slightly zoned into distinct spodumene-rich and albite-rich areas and is divided into an edge (or border), and a central zone. Overall, spodumene is about 20–24% of the dike mass, albite–microcline is approximately 32–40%, and around 10–18% is mica (muscovite).

The border zone is about 45 cm in thickness, and consists of fine-grained albite, quartz and muscovite. Heavy minerals such as cassiterite and tantalite may occur associated with albite units. The central zone is spodumene-rich and consists of albite and spodumene crystals that are typically 10–25 cm ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

The Barreiro Deposit will be mined by open pit mining methods, using a contracted mining fleet consisting of hydraulic excavators, front-end loaders, and 40t trucks for both waste and ore, coupled with appropriate auxiliary support equipment.

The mine layout and operation are based on the following criteria:
• A single open pit on the Barreiro pegmatite;
• Low height mineralized material benches to reduce mine dilution and maximize mine recovery;
• Pre-splitting of the mineralized material to reduce mine dilution;
• Elevated inter-ramp angles for the waste to reduce strip ratio.

The basis for the scheduling includes:
• Pre-stripping the pit to liberate mineralized material;
• Pit cut-backs in years 4 to 6 to expand and deepen pit;
• Mining at a rate of 1.80 Mtpa;
• The planned open pit mine life is 12 years;
• The mining fleet is based on road trucks and this fleet will be operated by a mining contractor.

At the Barreiro Mine, the mining operations will be carried out by a third-party contractor, with proven experience with similar sized operations in Brazil. In order to select the mining operations contractor, operational work technical specifications were compiled and forwarded to the companies for technical and commercial proposals. After selecting the company and signing a contract, the work of mobilization and construction of the construction site will begin immediately.

The run of m ........


Crushing and Grinding
Flow Sheet: Source

Ore trucked from the mine will be stacked on ROM piles. A Front-End Loader (FEL) will feed material into the crusher feed bin, and an apron feeder will draw the material into the primary crusher. A magnet will remove any tramp metal as the material passes to the scalping screen. The scalping screen undersize material (<9.5 mm) is taken to the DMS feed bin. The oversize material passes to the secondary cone crusher for size reduction. The secondary cone crusher product is joined by the tertiary cone crusher product and directed to a classification screen. The undersize material (-9.5 mm) joins the scalping screen undersize on the DMS feed bin conveyor. The oversize material is conveyed to the tertiary cone crusher feed bin, which splits the material between the two tertiary cone crushers, for size reduction, before it returns to the classification screen.


Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Projected Production:

CommodityProductUnitsAvg. AnnualLOM
Spodumene Mineral in concentrate kt 14172
Spodumene Concentrate kt 2613,133
Lithium Carbonate t  ......  Subscription required

Operational Metrics:

Metrics
Stripping / waste ratio  ......  Subscription required
Waste tonnes, LOM  ......  Subscription required
Ore tonnes mined, LOM  ......  Subscription required
Total tonnes mined, LOM  ......  Subscription required
Tonnes processed, LOM  ......  Subscription required
Annual processing capacity  ......  Subscription required
Annual ore mining rate  ......  Subscription required
* According to 2022 study.
Subscription required - Subscription is required.

Reserves at February 11, 2022:
Mineral Resources are reported an overall cut-off grade of 0.5% Li2O.

CategoryTonnage CommodityGradeContained Metal
Proven 16.93 Mt Li2O 1.38 %
Proven 16.93 Mt LCE 576.8 kt
Probable 4.83 Mt Li2O 1.29 %
Probable 4.83 Mt LCE 153.1 kt
Proven & Probable 21.76 Mt Li2O 1.36 %
Proven & Probable 21.76 Mt LCE 729.9 kt
Measured 18,741,000 t Li2O 1.41 %
Measured 18,741,000 t LCE 653.5 kt
Indicated 6,341,000 t Li2O 1.3 %
Indicated 6,341,000 t LCE 203.9 kt
Measured & Indicated 25,081,000 t Li2O 1.38 %
Measured & Indicated 25,081,000 t LCE 857.4 kt
Inferred 3,825,000 t Li2O 1.39 %
Inferred 3,825,000 t LCE 131.5 kt

Commodity Production Costs:

CommodityUnitsAverage
Total cash costs Spodumene USD  ......  Subscription required&nbs
All-in sustaining costs (AISC) Spodumene USD  ......  Subscription required&nbs
Assumed price Spodumene USD  ......  Subscription required&nbs
* According to 2022 study / presentation.
Subscription required - Subscription is required.

Operating Costs:

Units2022
OP mining costs ($/t milled) USD 194 *
Processing costs ($/t milled) USD  ......  Subscription required
G&A ($/t milled) USD  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required
* According to 2022 study.
Subscription required - Subscription is required.

2022 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Pre-Production capital costs $M USD  ......  Subscription required
Sustaining CapEx $M USD  ......  Subscription required
Closure costs $M USD  ......  Subscription required
Total CapEx $M USD  ......  Subscription required
OP OpEx $M USD  ......  Subscription required
Processing OpEx $M USD 182.9
Transportation (haulage) costs $M USD 345.6
G&A costs $M USD 93.6
Total OpEx $M USD  ......  Subscription required
Total Taxes $M USD  ......  Subscription required
Gross revenue (LOM) $M USD  ......  Subscription required
Net revenue (LOM) $M USD  ......  Subscription required
Pre-tax Cash Flow (LOM) $M USD  ......  Subscription required
After-tax Cash Flow (LOM) $M USD  ......  Subscription required
Pre-tax NPV @ 8% $M USD  ......  Subscription required
After-tax NPV @ 8% $M USD  ......  Subscription required
Pre-tax IRR, %  ......  Subscription required
After-tax IRR, %  ......  Subscription required
Pre-tax payback period, years  ......  Subscription required
After-tax payback period, years  ......  Subscription required
Subscription required - Subscription is required.


Proposed Heavy Mobile Equipment as of May 30, 2022:
HME TypeModelSizeQuantityLeased or
Contractor
Backhoe loader ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
Subscription required - Subscription is required.

Mine Management:

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

Staff:

Total WorkforceYear
Subscription required 2022

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2022
Pre-Feasibility Study Report 2022
Press Release 2022
Subscription required - Subscription is required.

News:

NewsDate
Sigma Lithium Files Ni 43-101 Technical Report For Production Expansion Supporting The Previously Announced 60% Increase In Mineral Reserves And US$ 15.3 Billion NPV January 19, 2023

Subscription required - Subscription is required.

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