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

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 Location:
25 km NE from Araçuaí, Brazil

  Regional Office:
Avenida Nove de Julho n° 4939 Tower Europa, 5th Floor, Office 51 Itaim
São Paulo
Brazil
01407-200
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Lithium
Mining Method
  • Truck & Shovel / Loader
Production Start...
Mine Life8 years (as of Jan 1, 2022)
Latest NewsSigma Lithium Reports 3Q 2023 Results; Posting 37% Net Profit Margin In Its First Operational Quarter     November 14, 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 host rock for the Xuxa pegmatite body is a biotite–quartz schist with a well-developed crenulation cleavage. Pegmatite xenoliths have been observed within the schist, with sizes ranging from a few centimetres to a metre. The pegmatite/schist contact is frequently hornfelsed.

The pegmatite is concordant with the regional foliation, striking northwest–southeast and dipping at 45–55º to the southeast. Drill data indicate the pegmatite has a strike length of 1,700 m, averages 12–13 m in thickness, and can reach as much as 20 m thick. It has been drill tested to 259 m vertical depth. It remains open to the west, east, and at depth.

Pegmatite mineralogy consists of the following minerals, with their approximate vein content: spodumene (20%), microcline and albite (40–45%), quartz (30%) and muscovite (5%). Spodumene occurs as pale green to colourless, elongated, tabular, crystals that can range in size from millimetre to as much as 80 cm in length and be as wide as 10 cm. The spodumene laths are set in a medium- to very coarse-grained groundmass of colourless albite, translucent quartz and pale grey perthitic microcline. Pale yellow–green medium- to coarsegrained muscovite micas may be present. Poikilitic textures of spodumene and quartz are common. Tantalite–columbite and cassiterite can occur in association with albite.

The Xuxa pegmatite dike is found on both sides of the Piaui River but does not crop out in the river valley. Two drill holes w ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

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

The mine layout and operation are based on the following criteria:
• Two independent open pits areas: Pit 1 in the north and Pit 2 in the south;
• Single access from both pits to the mine infrastructure pad and the processing plant;
• Pre-splitting of the ore zone to reduce mine dilution;
• Elevated inter-ramp angles for the waste to reduce strip ratio.

The basis for the scheduling includes:
• Six months of pre-stripping to liberate the ore;
• Pit 1 and Pit 2 mined in conjunction from Year 1 to Year 8 to reduce the drop-down rate and to facilitate the 1.5 Mtpa production rate;
• The planned open pit mine life is eight years;
• The mining fleet is based on road trucks and this fleet will be operated by a mining contractor.

The main mining activities will be:
- Digging or rock blasting of ore and waste;
- Excavation, loading and transport of ore and waste;
- Disposal of ore in the ROM yard and waste in the waste dump;
- Construction and maintenance of all internal accesses to the pit(s) and the waste dumps;
- Maintenance of the floor, drainage, coating and signaling of all access roads used in the operation;
- Implementation and maintenance ........


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

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Production:

CommodityProductUnitsAvg. Annual (Projected)LOM (Projected)
Spodumene Mineral in concentrate kt 15119
Spodumene Concentrate kt 2702,160
Lithium Carbonate t  ......  Subscription required


Reserves at June 26, 2021:
Mineral Resources are reported an overall cut-off grade of 0.5% Li2O.

CategoryTonnage CommodityGradeContained Metal
Proven 8.34 Mt Li2O 1.55 %
Proven 8.34 Mt LCE 319.7 kt
Probable 3.46 Mt Li2O 1.54 %
Probable 3.46 Mt LCE 131.8 kt
Proven & Probable 11.8 Mt Li2O 1.55 %
Proven & Probable 11.8 Mt LCE 451.5 kt
Measured 10,193,000 t Li2O 1.59 %
Measured 10,193,000 t LCE 400.8 kt
Indicated 7,221,000 t Li2O 1.49 %
Indicated 7,221,000 t LCE 266.1 kt
Measured & Indicated 17,414,000 t Li2O 1.55 %
Measured & Indicated 17,414,000 t LCE 666.9 kt
Inferred 3,802,000 t Li2O 1.58 %
Inferred 3,802,000 t LCE 148.6 kt



Proposed Heavy Mobile Equipment as of May 30, 2022:
HME TypeModelSizeQuantityLeased or
Contractor
Bulldozer ....................... Subscription required 38 t ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
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....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
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Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Oct 6, 2023
....................... Subscription required ....................... Subscription required Subscription required Nov 1, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 26, 2023
....................... Subscription required ....................... Subscription required Subscription required Oct 6, 2023
....................... Subscription required ....................... Subscription required Subscription required Oct 6, 2023
....................... Subscription required ....................... Subscription required Subscription required Oct 6, 2023
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2022
Feasibility Study Report 2022
Feasibility Study Report 2022
Press Release 2022
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Subscription required - Subscription is required.

News:

NewsDate
Sigma Lithium Reports 3Q 2023 Results; Posting 37% Net Profit Margin In Its First Operational Quarter November 14, 2023
Sigma Lithium Announces A Potential Increase Of Its Mineral Resource Estimate To Over 110mt, Amongst Largest Scale Globally November 1, 2023

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