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Brazil
Grota do Cirilo (Xuxa) 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
EmailEmail
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Filings & News

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Overview

StageConstruction
Mine TypeOpen Pit
Commodities
  • Lithium
Mining Method
  • Truck & Shovel / Loader
Processing
  • Dense media separation
  • Magnetic separation
Mine Life9.2 years (as of Jan 1, 2019)
Sigma started to produce battery-grade lithium concentrate on a pilot scale in 2018, shipping bulk samples to potential customers from its Phase I Production Plant. Based on the initial design being considered under the FS, a larger scale lithium concentration plant will contemplate a capacity of 220,000 tonnes of battery-grade spodumene concentrate annually. If recommended in the FS and required funding is obtained, Sigma would seek to begin construction by the end of the second quarter of 2019 and to become a fully-operational sustainable lithium producer in 2020.

Sigma adopted a development strategy with includes low-technical execution risk and low-capital expenditures for the Grota do Cirilo Project. As a result, Sigma decided to conduct its first feasibility analysis exclusively on the Xuxa deposit.
Latest NewsSigma Lithium Updates Feasibility Study with Phase 1 After-Tax NPV of US$1.6 Bn, Increasing Mineral Reserves 2.6x to 34Mt...     April 11, 2022


Owners

 
CompanyInterestOwnership
Sigma Lithium Resources Corp. 100 % Indirect

Deposit Type

  • Pegmatite


Summary:

- The pegmatite remains open on surface to the south and at depth.
- A total of 93 drill holes have been completed at Xuxa with an average depth per hole of 243 meters for a total of 13,976 meters.
- The Xuxa pegmatite is approximately 1.7km long and is 14-16m wide and strikes northwest to southeast dipping around 50 degrees west.
- The pegmatite contains large crystals of spodumene, which are easily visible in the drill cores.


Mining Methods

  • Truck & Shovel / Loader


Summary:

The proposed mining operations are based on the use of hydraulic excavators and a haul truck fleet engaged in conventional open pit mining techniques.

Excavated material will be loaded to trucks and hauled to either the ROM pad or the waste piles. Ore excavation and haulage will be monitored by quality-control personnel and details of material movement will be recorded by a radio dispatch system. Weathered material is considered to be free dig with transitional material to be lightly blasted to loosen it for digging. Fresh rock will be typically blasted on 6m benches for ore domain and 12m benches for waste domain. In order to reduce dilution and maximize mine recovery, controlled blasting (pre-splitting) will be used.


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
• Low height ore benches to reduce mine dilution and maximize mine recovery
• 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
• Mining of Pit 1 first as this is closer to the processing plant and is also included in the current
environmental license process
• Disposal of the waste rock at the start of operation at pile 1 (close to processing plant) and pile 2
• Commence disposal of waste rock at pile 3 after one year and three months from the start of the
operation
• Commence mining of Pit 2 from Year 3 onwards
• Mine both pits in conjunction from Year 3 to Year 6 to reduce the drop-down rate and to facilitate
the 1.5 Mtpa production rate
• The planned open pit mine life is nine years and three months
• The mining fleet is based on off-highway trucks for the waste movement and road trucks for the
ore to be operated by a mining contractor.
The open pit mining activities were assumed to be primarily undertaken by a contractor-operated fleet.

The proposed plant processing rate allowed a total ore material movement of under 2 Mtpa, which is suitable for small equipment such as on-highway trucks.

Small excavator and loading equipment are also suitable for ore selectivity, whilst maintaining productivity in 6-m operational benches.

Off-highway trucks were considered for the waste rock given a production of around 18 Mtpa.

For waste rock, an excavator of 15 m3 (Hitachi 2500 or similar) was selected to load 150-t class trucks (CAT 785 or similar). For ore, a 4.6 m3 excavator (CAT 374 or similar) was selected to work with a 40-t truck (Actros 8x4 or similar). The same support equipment class was defined for both.


Crushing and Grinding
Flow Sheet: Source


Processing

  • Dense media separation
  • Magnetic separation

Flow Sheet: Subscription required

Summary:

The Xuxa Plant will be located approximately 1.7 km and 2.3km from the north and south Xuxa mine open-pits, respectively. The DMS plant will use proven and well-established technology, and is designed to produce 220,000 tonnes per annum of minimum 6.0% Li2O concentrate with an iron content of below 1% Fe2O3. The lithium concentrate particle size is anticipated to be between +0.5mm to 9.5mm.

The plant throughput capacity is based on 1.5 Mtpa (dry) of ore fed to the crushing circuit. The current Xuxa Plant design also contemplates a modular and integrated expansion option, with the installation of an in-house crushing circuit to potentially increase processing capacity to 3.0 Mtpa.

The Xuxa Plant will include the following:
- A three-stage conventional crushing and screening circuit.
- DMS screening and mica removal via up-flow classification.
- Two-stage DMS circuit for coarse fraction.
- Two-stage DMS circuit for fines fraction with a magneti ........

Recoveries & Grades:

CommodityParameterAvg. LOM
Lithium Recovery Rate, % 60.4
Lithium Head Grade, % 1.46
Lithium Concentrate Grade, % 6

Projected Production:

CommodityProductUnitsLOM
Lithium Carbonate t 33,000
Lithium Concentrate kt 220

Operational Metrics:

Metrics
Stripping / waste ratio 9.6 *
Tonnes milled, LOM 13.8 Mt *
Annual mining rate 1.5 Mt *
Annual milling rate 1.5 Mt *
* According to 2019 study.

Reserves at October 7, 2019:

CategoryTonnage CommodityGrade
Proven 10.27 Mt Li2O 1.45 %
Probable 3.52 Mt Li2O 1.47 %
Proven & Probable 13.79 Mt Li2O 1.46 %
Measured 10,193,000 t Li2O 1.59 %
Indicated 7,221,000 t Li2O 1.49 %
Measured & Indicated 17,414,000 t Li2O 1.55 %
Inferred 3,802,000 t Li2O 1.58 %

Commodity Production Costs:

CommodityUnitsAverage
Cash costs Spodumene USD  ......  Subscription required *
Total cash costs Spodumene USD  ......  Subscription required *
Assumed price Spodumene USD  ......  Subscription required *
* According to 2019 study / presentation.
Subscription required - Subscription is required.

Operating Costs:

Units2019
OP mining costs ($/t mined) USD 2.12 *
Processing costs ($/t milled) USD  ......  Subscription required
* According to 2019 study.
Subscription required - Subscription is required.

2019 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Initial CapEx $M USD  ......  Subscription required
Total CapEx $M USD  ......  Subscription required
OP OpEx $M USD  ......  Subscription required
Processing OpEx $M USD 152
G&A costs $M USD 26
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
Operating margin (LOM) $M USD  ......  Subscription required
EBITDA (LOM) $M USD  ......  Subscription required
Net Income (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 September 16, 2019:
HME TypeModelSizeQuantityLeased or
Contractor
Dozer (crawler) ....................... Subscription required ....................... Subscription required Leased
....................... 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 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 Leased
Subscription required - Subscription is required.

Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Subscription required - Subscription is required.

News:

NewsDate
Sigma Lithium Updates Feasibility Study with Phase 1 After-Tax NPV of US$1.6 Bn, Increasing Mineral Reserves 2.6x to 34Mt... April 11, 2022
Sigma Lithium Advances Towards Near Term Production And Completes Construction Of 100% Of The Plant Foundation Earthworks On Schedule... April 4, 2022
Sigma Lithium Announces C$60 Million Private Placement of Common Shares at C$11.75 December 10, 2021
Sigma Lithium Starts Construction Of Production Plant Foundation And Infrastructure And Orders Long Lead Items, On Schedule For Production In 2022 December 6, 2021
Sigma Lithium Announces Selection of NASDAQ as Its U.S. Market for Its Dual-Listing, Participation at United Nations High Level Dialogue on Energy Transition... September 2, 2021
Sigma Files PEA Phase 2 Technical Report Supporting Doubling Planned Production Capacity to 440,000tpa July 19, 2021
Sigma Breaks Ground Advancing Project to Implementation Stage and Commences Earthworks in Preparation for Civil Construction June 23, 2021
Sigma Lithium Announces Exceptional PEA Results Supporting Doubling Planned Production Capacity to 440,000tpa (66,000 LCE) June 2, 2021
Sigma is Awarded a Binding Commitment for a Development Bank Credit Line of C$18,750,000 on ESG Attributes and Publishes Third Quarter Results December 7, 2020
Sigma Announces Management, Board & Technical Committee Updates Ahead of Construction September 25, 2020
Sigma Announces the Signing of an Engineering Contract with Duro Felguera and a Letter of Intent from Spanish Export Credit Agency... July 21, 2020
Sigma Announces US$45 Million Project Finance Facility with Societe Generale June 29, 2020
Sigma Provides an Update on Engineering and Construction Contract for its Grota do Cirilo Project and 2020 First Quarter Results June 15, 2020
Sigma Files Independent Feasibility Study Technical Report for the Environmentally Friendly Xuxa Lithium Project November 7, 2019
Sigma Lithium Obtains Environmental Licenses for Construction and Installation of Commercial Production Plant June 11, 2019
Sigma Lithium Triples Measured and Indicated Mineral Resources at Grota do Cirilo January 10, 2019

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