Grota do Cirilo Phase 2 - Barreiro Project

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Mine TypeOpen Pit
  • Lithium
Mining Method
  • Truck & Shovel / Loader
Production Start... Lock
Mine Life11.8 years (as of Jan 1, 2022)
ShapshotIn April 2024, Sigma Lithium announced the final investment decision (FID) on Phase 2 of their Grota do Cirilo Project. Sigma expects the second phase to double production from 270,000 tonnes per annum (tpa) to 520,000tpa. Sigma has already been awarded an environmental license to build and operate the Phase 2 plant.
Related AssetGrota do Cirilo Phase 1 - Xuxa


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.



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Deposit type

  • Pegmatite


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 in length but can more rarely can attain as much as a metre in length. Spodumene crystals are also present as short, prismatic, elongated laths. The spodumene laths are colourless or pale green, sometimes displaying a poikilitic texture of fine- to medium-grained quartz and/or pale green sericite. Petalite occurs sporadically, as both colourless, translucent to transparent, coarse to very coarse-grained crystalline aggregates. It can also be present as cryptocrystalline, translucent masses.



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Mining Methods


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Crushers and Mills

Milling equipment has not been reported.


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.



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CommodityProductUnitsAvg. AnnualLOM
Spodumene Mineral in concentrate kt 14172
Spodumene Concentrate kt 2613,133
Lithium Carbonate t 35,500

Operational metrics

Annual ore mining rate 00
Annual processing capacity 000
Stripping / waste ratio 000
Waste tonnes, LOM 000000
Ore tonnes mined, LOM 00000
Total tonnes mined, LOM 000000
Tonnes processed, LOM 00000
* According to 2022 study.

Production Costs

Total cash costs Spodumene USD 000
All-in sustaining costs (AISC) Spodumene USD 000
Assumed price Spodumene USD 0000
* According to 2022 study / presentation.

Operating Costs

OP mining costs ($/t milled) USD 194 *  
Processing costs ($/t milled) USD  ....  Subscribe
G&A ($/t milled) USD  ....  Subscribe
Total operating costs ($/t milled) USD  ....  Subscribe
* According to 2022 study.

Project Costs

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

Heavy Mobile Equipment


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Mine Management

Source Source
Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jan 18, 2024
....................... Subscription required ....................... Subscription required Subscription required May 30, 2022
....................... Subscription required ....................... Subscription required Subscription required Jan 18, 2024

Total WorkforceYear
Subscription required 2022


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