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

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 Location:
25 km NE from Araçuaí, Brazil

  Project Contacts:
Avenida Nove de Julho n° 4939 Tower Europa, 5th Floor, Office 51 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

StageConstruction
Mine TypeOpen Pit
Commodities
  • Lithium
Mining Method
  • Truck & Shovel / Loader
Production Start...
Mine Life8 years (as of Jan 1, 2022)
Latest NewsSigma Lithium Announces Initiation Of Commissioning Of Dense Medium Separation Processing Plant And Go Forward Leadership As It Evolves To Lithium Producer     January 23, 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
Source: Subscription required

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Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Projected Production:

CommodityProductUnitsAvg. AnnualLOM
Spodumene Mineral in concentrate kt 15119
Spodumene Concentrate kt 2702,160
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 milled, LOM  ......  Subscription required
Annual milling rate  ......  Subscription required
Annual ore mining rate  ......  Subscription required
* According to 2022 study.
Subscription required - Subscription is 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

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 ($/t milled) USD 195 *
Processing costs ($/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 120.4
Transportation (haulage) costs $M USD 256.2
G&A costs $M USD 38.4
Total OpEx $M USD  ......  Subscription required
Total Taxes $M USD  ......  Subscription required
Royalty payments $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
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
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Nov 1, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 1, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 1, 2022
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 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 Announces Initiation Of Commissioning Of Dense Medium Separation Processing Plant And Go Forward Leadership As It Evolves To Lithium Producer January 23, 2023
Sigma Lithium Successfully Initiates Commissioning Of Greentech Plant On Schedule And Within Budget December 20, 2022

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