Sigma Presentation | August 2021

Sigma Lithium Corporation

TSX-V: SGMA: CN

OTC: SGMLF

www.sigmalithiumresources.com

Disclaimer

1

Cautionary Note Regarding Forward-Looking StatementsThis presentation contains “forward-looking information” (also referred to herein as “forward-looking statements”) under the provisions of applicable Canadian securitieslegislation regarding Sigma Lithium Resources Corporation (“Sigma”). Generally, these forward-looking statements can be identified by the use of words such as “plans”,“expects”, “is expected”, “budget”, “scheduled”, “estimates”, “forecasts”, “intends”, “anticipates”, “believes” or variations of such words and phrases or statements thatcertain actions, events or results “may”, “could”, “would”, “might” or “will”, “occur” or “be achieved” or the negative connotation thereof.

Forward-looking statements include, but are not limited to, those in respect of: the economic outlook for the mining industry, including competitors of Sigma; expectationsregarding lithium prices, current project exploration and development expectations and plans in respect of Sigma’s material property located in Minas Gerais, Brazil (the“Sigma Project”); liquidity, capital resources and expenditures; sustainability; business development strategies and outlook; production forecasts; cash flows, sales and othereconomic measures; development of mineral resource and mineral reserve estimates; financing opportunities; business partnerships; and economic performance, financialconditions and other expectations.

Forward-looking statements are subject to known and unknown risks, uncertainties and other important factors that may cause the actual results, level of activity,performance or achievements of Sigma and/or the Sigma Project to be materially different from those expressed or implied by such forward-looking statements, includingbut not limited to, those in respect of: the Sigma Project may not be developed as planned and uncertainty of whether there will ever be production at the Sigma Project;cost overruns; risks associated with Sigma’s ability to successfully secure adequate funding; market prices affecting the ability to develop the Sigma Project; risk to thegrowth of lithium markets; lithium prices; inability to obtain required governmental permits and operations being limited by government-imposed limitations; inability toachieve and manage expected growth; political risk associated with foreign operations, and emerging and developing market risks; risks associated with not havingdevelopment and production experience; operational risks; changes in government regulation; changes to environmental requirements; insurance risk; receipt and securityof mineral property titles and mineral tenure risk; competition; market risk; volatility in global financial conditions; uncertainties associated with estimating mineralresources, including uncertainties relating to the assumptions underlying mineral resource estimates and whether mineral resources will ever be developed into mineralreserves; opposition to development of Sigma’s mineral properties; surface access risk; geological, technical, drilling or processing problems; uncertainties in estimatingcapital and operating costs, cash flows and other project economics; liabilities and risks, including environmental liabilities and risks, inherent in mineral extractionoperations; health and safety risks; unanticipated results of exploration activities; unpredictable weather conditions; unanticipated delays in preparing technical studies; anincrease in the costs of manufacturing products, including the costs of any raw materials used in the process; inability to generate profitable operations; restrictivecovenants in debt instruments; lack of availability of additional financing on terms acceptable to Sigma; shareholder dilution; dependence on key personnel; likelihood ofpayment of dividends in the future; competition for, amongst other things, capital, undeveloped lands and skilled personnel; fluctuations in currency exchange and interestrates; regulatory risk; conflicts of interest; share price volatility; cyber-security risks and threats; nd risks relating to public health crises, including the COVID-19 virus.

Forward-looking statements also include, but are not limited to, factors and assumptions in respect of: the ability of Sigma to fund, advance and develop the Project, Sigma’sability to operate in a safe and effective manner; the ability to obtain and maintain mining, exploration, environmental and other permits, authorizations and approvals; theresults from the pilot plant and laboratory; demand for lithium, including that such demand is supported by growth in the electric vehicle market; the impact of increasingcompetition in the lithium business, and Sigma’s competitive position in the industry; market position and future financial or operating performance of Sigma; generaleconomic conditions; estimates of, and changes to, the market prices for lithium; exploration, development and construction costs for the Project; estimates of mineralresources and mineral reserves, including whether mineral resources will ever be developed into mineral reserves; reliability of technical data; anticipated timing andresults of exploration, development and construction activities; Sigma’s ability to obtain additional financing on satisfactory terms, including the financing contemplated inthe Mitsui HOA; the ability to develop and achieve production at the Project; successful negotiation of definitive commercial agreements, including off-take agreements;accuracy of current budget and construction estimates; the timing and possible outcome of regulatory and permitting matters; and anticipated trends and effects of theCOVID-19 virus.

www.sigmalithiumresources.com

Disclaimer (Cont’d)

2

Although Sigma has attempted to identify important factors, risks and assumptions that could cause actual results to differ materially from those contained in forward-looking statements, there may be others that cause results not to be as anticipated, estimated or intended. There can be no assurance that such forward-looking statements will prove to be accurate, as actual results and future events could differ materially from those anticipated in such forward-looking statements. Accordingly, readers should not place undue reliance on forward-looking statements. Forward-looking statements are made as of the date hereof and, accordingly, are subject to change after such date. Forward-looking statements are provided for the purpose of providing information about management’s current expectations and plans and allowing investors and others to get a better understanding of Sigma’s operating environment. Sigma does not intend or undertake to update any forward-looking statements that are included in this presentation, whether as a result of new information, future events or otherwise, except in accordance with applicable securities laws.

Cautionary Note Regarding Mineral Resource Estimates

This presentation uses the terms “mineral resources,” “measured mineral resources,” “indicated mineral resources”, and “inferred mineral resources” to comply with the reporting standards in Canada. SEC Industry Guide 7 does not recognize mineral resources and U.S. companies have not generally been permitted to disclose resources in documents they file with the SEC. Although new reporting classification standards have been adopted in the United States which replace and modernize the standards in SEC Industry Guide 7 and permit the disclosure of estimated mineral resources, the modernized estimation methodologies adopted by the SEC may still differ from those permitted by NI 43-101 and the CIM Definition Standards.

Third Party Information

This presentation includes .market, industry, economic data and projections which was obtained from various publicly available sources and other sources believed by Sigma to be true. Although Sigma believes it to be reliable, it has not independently verified any of the data from third party sources referred to in this presentation, or analyzed or verified the underlying reports relied upon or referred to by such sources, or ascertained the underlying economic and other assumptions relied upon by such sources. Sigma believes that the market, industry and economic data is accurate and that the estimates and assumptions are reasonable, but there can be no assurance as to the accuracy or completeness thereof. The accuracy and completeness of the market, industry and economic data in this presentation are not guaranteed, and Sigma does not make any representation as to the accuracy or completeness of such information.

Technical Information

Scientific and technical information contained in this presentation was reviewed and approved by Marc-Antoine Laporte, P. Geo., M. Sc. of SGS Canada Inc. Mr. Laporte is a “qualified person” as defined by National Instrument 43-101 – Standards of Disclosure for Mineral Projects (“NI 43-101”). Certain technical information in this presentation was derived from the technical report entitled “Grota do Cirilo Lithium Project, Araçuaí and Itinga Regions, Minas Gerais, Brazil, NI 43-101 Technical Report on Feasibility Study, Final Report” prepared by Fred Claridge, P. Eng, Lucas Duarte, P. Eng, Ara Erzingatzian, P. Eng, Kiedock Kim, P. Eng, Marc-Antoine Laporte, P. Geo, and Porifrio Cabaleiro Rodriguez, MEng, which is dated October 18, 2019 and effective September 16, 2019 (the “Feasibility Study”). The Feasibility Study is available on the SEDAR profile of Sigma at www.sedar.com. Mineral resources in the Feasibility Study are reported inclusive of mineral reserves. Readers are advised that mineral resources that are not mineral reserves do not have demonstrated economic viability. Some figures herein have been rounded for presentation purposes. This presentation and the Feasibility Study contain certain non-GAAP measures. The non-GAAP measures do not have any standardized meaning within IFRS and therefore may not be comparable to similar measures presented by other companies. These measures provide information that is customary in the mining industry and that is useful in evaluating the Sigma Project. This data should not be considered as a substitute for measures of performance prepared in accordance with IFRS.

This presentation is confidential and is not to be forwarded or distributed without the consent of Sigma.

Lithium Sector Momentum and Long-Term Outlook

2.264

3.240

5.150

6.551

8.566

11.301

14.797

2019 YTD 2020 2021E 2022E 2023E 2024E 2025E

4

The Fast & Unexpected “Leapfrogging Growth” of Europe EVDemand in Post-COVID 19 World

Decarbonization as one of the main messages for the post-pandemic economy

Europe overtook China as the leading market for EVs in 2020

EV market share in Europe: 3.3% (2019) JUMPS to 15% Q1 21

China continues to grow: 20% EV penetration in 2025

Source: UBS.

EV Sales in Europe137% YoY (19/20)

Europe

China

Others

World EV sales (‘000) and Market Share (%)

53%

26%

41%

43%

30%

51%

32%

48%

34%

46%

36%

44%

37%

42%

21%

16%

19%

20%

20%

20%

21%

2020

5

Source: Wall Street Research.(1) S&P Global as of August 16th, 2021. Current prices reflect CIF North Asia for Chemicals and FOB Australia for Spodumene.

Lithium Prices (U$/T)

Lithium Carbonate

6% Spodumene Lithium

Lithium Hydroxide

Lithium Prices

Structural changes in the automotive sector have resulted in a dramatic shift toward

EVs

Lithium-based batteries are expected to be key in the decarbonization of ground

transport

KEY Question: what is the long-term incentive price?

8.363

12.000

17.000

20.500 19.133

10.363

13.302

18.500

21.000 19.737

419

835

1.288 1.250 1.232

2020 2021E 2022E 2023E 2024E

Lithium Is The Most Leveraged Material in The EV Thematic -Spodumene Spot Prices Increased 3x Since 2020

$14,000/t

$1,300/t

$17,600/t

Current (1)

6

(248)

10

Oversupply (Deficit)

Supply Demand

(65)

Fully Funded New Entrants

U$ 3.7bn+raised by

key lithium players in

1H21(1)

427

982

328

227

2020 HardrockProduction

Brine Production 2025

427

785982

417

850

1,230

2020 2023 2025

Projected Supply is Dependent on Further Funding of New Entrants, and Fully-Funded Players are Few and Far Between

33 ktpaof LCE Production

(2022)+

33 ktpa(2023)

Lithium Supply Increases with Project Executions(k MT LCE)

Lithium Market to Go into Deficit(k MT LCE)

40 ktpaof LCE Production

(2022)+

20 ktpa(Long Term)

25 ktpaof LCE Production

(2022)

Source: Wall Street Research, Benchmark Mineral Intelligence, Company Information(1) Considers recent and planned equity raisings by Lithium Americas, Albermarle, NeoLithium, SQM, Gangfeng, and Piedmont

A Tight Market Heading Rapidly into a Deficit Even if NewProjects Come Online

Sigma – Summary

World’s Next Major Lithium Producer

▪ World’s next relevant spodumene producer with 33,000t LCE production capacity in 2022 (1), doubling to 66,000t LCE in 2023 (2)

▪ Offtake “take-or-pay” agreement with $30m pre-payment from Mitsui(3)

▪ $50m project finance debt from Societe Generale(4)

▪ Lowest CAPEX intensity amongst peers

▪ Competitive operating costs

▪ Stage 1 (Xuxa) 9 years LOM (5) and Stage 2 (Barreiro) 13 years LOM (6)

▪ Stage 1 (Xuxa Deposit) has the 3rd highest grade deposit in the world

▪ Brazil renewable energy competitive advantage enables medium term intermediate chemical strategy

8

(1) As of Xuxa Feasibility Study announcement on October 7th, 2019; (2) As of PEA results announcement on June 2, 2021; (3) As of strategic alliance announcement on April 5th 2019; (4) Under MoU; (5) Considering proven & probable reserves; (5) Phase 1 (Xuxa) DFS; (6) Phase 2 (Barreiro) PEA.

0

100

200

300

400

500

600

700

800

900

Jan

-20

Feb

-20

Mar

-20

Ap

r-2

0

May

-20

Jun

-20

Jul-

20

Au

g-2

0

Sep

-20

Oct

-20

No

v-2

0

Dec

-20

Jan

-21

Feb

-21

Mar

-21

Ap

r-2

1

May

-21

Jun

-21

Jul-

21

Au

g-2

1

SGMA-CA US Listed Juniors

9

Share Price Performance Since Jan 2020 (USD) (1)

Shareholders Structure

Largest Shareholder Ownership

Management and Directors (A10 Fund) 55.5%

Main Investors

Key Statistics

Date as of 9th August, 2021

Symbol

TSX-V: SGMA:CA

OTC-QB: SGMLF

Shares Outstanding 87,328,212

Average Daily Volume2 75,1524 = C$531K

Market Cap US$ 659 million

Cash(3) US$ 37million

Project Finance

▪ Bank Facility(4): US$ 50 million

▪ Development Bank Facility(5): US$ 15 million

Source: Factsheet as of August 6th and Company Public Fillings. Notes: (1) Considers Standard Lithium Pre-US Listing; 2) Last 30 Days; (3) 2Q21; (4) Under MOU; (5) As of Press Release from December 8th, 2020.

Dec 13, 2020: Lock Up Ended

Lock-Up EndedJune 13, 2021

707%

401%

Capital Structure: Sigma Has Been Publicly Traded Since 2018in TSX-v, But It is Tightly Held By Large Institutional Investors

Pursuing a Listing in a Major U.S.A. Exchange

10

Nasdaq has unparalleled access to the EV thematic investors and highlights

sigma’s uniqueness in greentech lithium mining

Follows Brazil joining US critical minerals group strategically positioned to

supply USA with lithium

Decision based on close benchmarking of Sigma’s advanced pre-production

stage of execution with peers

(Producer)

(Producer) (Producer)

(Pre-Producer )

11

Shipping: Ilhéus Port

Road: Existing Highway to Port

Ilhéus Port: 500 km away and allows smaller 40,000t ships

Connected to theport by severalhighways

Power: Hydroelectricity

Irapé power plant,360MW capacity

Favorable Atlantic Port Location Transmission Lines

Water Licensefor River at Property

Minas Gerais

Belo Horizont

e

680km

500kmAraçuaí

Port Ilheus

Existing transmissionlines at property

(Hamburgo)(Houston)

Ilhéus Port

(Shanghai)

Strategically Well Positioned to become a Leader in Lithium

3

Source: Sigma’s Feasibility Study.Notes: (1) Reserves; (2) As of strategic alliance announcement on April 5th 2019.

Global Strategic

Relevance

4

2Near Term

Cash Flow

Integrated pre-chemical concentrate with downstream clients

Strategic alliance with Mitsui for phase 1 (2)

100% owned - largest hardrock lithium project in the Americas (1)

Highest quality & purity: 3rd highest grade in the world

Commercial production in 2022 of high purity lithium

concentrate

12

1

5

Proactively

Green &

Sustainable

Best-in-Class Management

Based Locally

Featured as “Sustainable Miner” at UN - COP 25 in 2019

100% dry stacking, 100% hydroelectric power and 100% water

recirculation

Track record of achieving milestones since IPO with superb

execution

Integrated

Supply

Sigma: Large Near-Term Producer of Unique “Green” Lithium

A Vertically Integrated Near-Term Lithium Producer and Key Player in the EV Value Chain

13

Battery ProducersSpodumene Mining Greentech DMS Plant Chemical

Tollers

Battery Producers

EV Manufacture

rs

Nossa Vantagem Competitiva: Concentrado Pré-Químico de LítioGrau Bateria de Alto Teor, PRODUZIDO COM TECNOLOGIA LIMPA

8

Produto do Beneficiamento da Sigma: Concentrado Pré-Químico Grau Bateria

Austrália Grau Bateria Granulometria Fina Seco

RochaAustrália Grau Bateria

Granulometria Fina Úmida

Spodumene Ultra High Purity 6% Premium Pre-Chemical

20

x Sig

ma

pre

miu

m

Lithium Hydroxide

or Carbonate

EV Grade Battery

Completed Electric Vehicle

(Sigma Today: 52Mt –

4 out of 9 former producing mines

)

(Expanded Potential

All Open Pit)

Sigma to Become Strategic & Dominant in the Atlantic

(Greenbushes)

Li2O

G

rad

e (

%)

(Wodgina)

Million Tonnes of Lithium Carbon Equivalent (LCE)

Projects Producing or in Feasibility - Measured and Indicated NI-43101 Mineral Resource

Buble Size: Measured and IndicatedMineral Resource

Current producers

Development Projects

Source: Company Fillings 14

Clear Investment Plan to Get to Production by 2022

15

2035

High Quality Leads to Low Processing and Overall ProductionCosts

16

2,00%

1,65%

1,55%

1,54%

1,47%

1,43%

1,42%

1,41%

1,40%

1,38%

1,34%

1,25%

1,18%

1,17%

1,16%

1,12%

1,06%

1,06%

1,01%

0,98%

0,50%

Greenbushes (Abermale, Tinaqui &…

Manono (AVZ Resources)

Sigma Phase 1

Mt Holland (SQM & Wesfarmers)

Wabouchi (Nemaska Lithium)

Mt Cattlin (Galaxy Resources)

Sigma Phase 2

Finnis (Core Lithium)

James Bay (Galaxy Resources)

Kathleen Valley (Liontown)

Mt Marion (Ganfeng & MRE)

Greater Pilgangoora (Pilbara Minerals)

Wolfsberg (European Lithium)

Wodgina (Abermale & MRE)

Piedmont (Piedmont Lithium)

Arcadia (Prospect Resources)

Mibra (AMG)

Mina do Barroso (Savannah)

Authier (Sayona Mining)

Rose Tantalum (Critical Elements)

Bald Hill (Alita Resources)

Cash Cost BreakdownAmount per Ton

DFS

Mining Cost $149

Processing Cost $75

G&A Cost $13

FOB Mine $238

Transportation Cost $104

Total Cash Cost at China Port

$342

High Lithium Oxide Grade(Measured & Indicated %)

Sigma Spodumene Cash-Cost Breakdown

Source: Company Fillings

Sigma: One of the Lowest Cost Spodumene ProducersGlobally

17

Current Market PriceUS$ 1,300 per tonne (1)

Australia I Australia II Australia III Australia IV Australia V Australia VI Australia VII

DFS - $342

Source: Shanghai Metals Market.Notes: (1) S&P Global as of August 16th, 2021

18

Benchmark Cost Curve: Sigma’s Low Cost Validated By ItsFormer Mine “Cachoeira”, in Brazil, After Greenbushes in AUS

Source: Benchmark Mineral Intelligence.

Superior Quality of Sigma’s High Purity Lithium Concentrate isVisible to The Naked Eye

19

Australian Wet Fines

Australian Wet Fines

Sigma’s Dry Coarse

Sigma’s Dry Control Sample

19

One of the World’s Most Capital Efficient Lithium Projects

20

Start-up Capital Intensity (1)(2)

(US$/tpa)

323

382

445

689

739

777

779

835

1.362

G. do Cirilo

Finniss

Goulamina

Kathleen V.

James B.

Barroso

Manono

Authier

Rose

(3)Sigma’s strategic advantages allows

its operations to be one of the lowest start-up capital intensity in terms of spodumene production

Source: Company announcements, Bloomberg. Ratio of upfront capital cost (including contingencies) and average annual spodumene concentrate production. Capital cost estimates converted to USD at spot rate of AUD/USD 0.7423. Based on Stage 1 DFS upfront capital cost estimate of A$89m and average annual production of 173ktpa

Sigma’s Integrated Business Model with End-Users SupportsExponential Growth: Lowers Capex and Increases ROIC

Lithium “Major” Producers

1 Majors 1 Chemical Asset Light

Lithium “Junior” Pre-Producers

Low ROICLow Capex | High ROIC

BatteryMiningAdvancedMetallurg

y

(Owned or

Tolled)Chemica

l

Cathode

Client Driven Integrated Demand for Green Lithium

BatteryMiningAdvancedMetallurg

y

TolledChemica

l

Cathode

Customer3

13,000 t LCE

Customer2

10,000 t LCE

2023 Phase 2: 33,000 t LCE / year

Customer10,000 t LCE

Customer 2 Customer 3

2022 Phase 1: 33,000 t LCE / year

Mitsui1

Customer10,000 t LCE

Same Customer Base

21

22

▪ Mitsui is one of the largest Japanese companies, with a global footprint and an extensive network of relationships with key players in the sector

▪ Sigma can leverage Mitsui’s expertise in several aspects of the market to create value, optimizing its strategy / operations

▪ Take-or-pay contract ensures capital and cash flow predictability for future projects

▪ Sets Mitsui as a potential future partner in other projects, securing funding for further growth

Spodumene Producers Chemical Tollers Battery ProducersElectric Vehicle Manufacturers

Ongoing Commercial Discussions

Lithium demand to skyrocket in coming

years as few players enter the market...

...leading end-users and traders to rush to

secure future supply...

...as Sigma continues to forge relationshipsacross the chain...

...and holds groundbreaking

commercial discussions

Paved Relationship Network and Potential GrowthOpportunities

23

“Green” and ESG Sustainable Lithium: Sigma Lithium Featuredas “Responsible Miner” at the United Nations ClimateConference COP 25

“S”- Socially Transformational

• 500 direct jobs and 6,500 indirect jobs• US$100mm to be paid in royalties over

14 years• Workforce training programs in

partnership with SENAI

• 100% green-powered by hydroelectricity• Dry stacking tailings & low residue mining• Greentech dense media digitally

automated• Water recycling of 90%

“E”- State-of-the-Art Environmental “G”- Canadian Governance

• Out of 5 board members 2 are independent

• Canadian Corporation listed in the TSX• Audited by KPMG Canada and SGS

Canada for 5 years

Sigma was invited to present its Sustainable Mining Case Studyat the World Climate Summit (United Nations Climate Conference COP25)

24

“Examples of actions include dry-stacking tailings management from inception at the pilot plant and investing in water recirculation equipment that would lead the company to recycle 90% of the water. And then there is energy efficiency, 100% of the energy is green, power is sourced from hydro (…) But why?

Because being in battery materials… the purpose of that value chain is to decarbonize at the “mobility-end” of the value chain. So, if we did not behave accordingly by being 100% green and by powering the energy with 100% green energy and enforcing those practices all along, we would not be a sustainable member of

that [EV] value chain.”

- Ana Cabral (CSO and Co-Chairman)

“Sigma produces environmentally sustainable high-quality lithium concentrate from its pilot plant on site in Brazil… the Company has some of the world’s largest and richest deposits of spodumene ore... and we set

out to develop it since the very beginning six years ago as an ESG green mining case study, pioneering amongst lithium companies … and we did that by focusing 15% of the CAPEX towards always keeping up with best environmental practices [management and rehabilitation] and obviously focusing on the way

[electric] power was sourced to beneficiate the material [lithium].”

- Ana Cabral (CSO and Co-Chairman)

Emis

sio

n +

En

viro

nm

en

tal

Imp

act

Plant

Sco

pe

1

Tailings

Mining Operatio

n

Lithium Peers

Water efficiency of dry process: 90%of water recirculated

Does not use hazardous chemicalsin beneficiation

Tailings are dry stacked

“Areas de pasto” selected for drytailings piles

Tailings: Feldspar and Quartz

Mining pit designed for minimalvegetation suppression

Ecosystem of river stream preservedfor community

Sco

pe

2

Power 100% Green Hydro Power

Wet process

Flotation process requireshazardous chemicals

Brine/Salars displace undergroundfresh water basis

Slurry Tailing Dooms: flotationoutputs 100% ultra fines

Brine pools occupy vast areas

Super pits: “Bigger is Better”

Brine pools disrupt wide ecosystemsin Atacama

Diesel generators (Australia /Atacama)

Coal powered electrical grid

25

Green Tech Plant and Practices: Why is Sigma Very DifferentEnvironmentally?

26

General Site: Phase 1General Site: Phase 1 and 2

5km

Phase 2: The Proximity of Deposits Brings Capex Economies ofScale to Plant

28

29

Phase 2: Successfully Completed Pre-Feasibility DMS PilotPlant Testing with High 60.7% Recovery

30

Drilling 18 hours for 6 days a week

2025 and Beyond: Large Proximity Enables Sigma to Scale Upwith Industry Growth

Note: For Phase 1 refer to Xuxa Feasibility Study announcement on October 7th, 2019. For Phase 2 refer to PEA results announcement on June 2, 2021. Phase 3 numbers are company estimates.

Increase Mineral Resource: Preparing Phase 3, a Major-ScaleProducer

31

Lavrado

Meio

Algodão

Maxixe

Nazinho do Chicão

January, 2021

5km

Lavra do Meio

Murial

Grota do CiriloProperty NI 43101 Deposits

Ph

ase

1

ReservesAvg.

Grade

13.7MT 1.55%

M&I Resources

17.4MT

Ph

ase2

Measured and

Indicated

Avg. Grade

20.5MT 1.43%

Ph

ase

3

Estimated Volume

Avg. Grade

[15 – 18] 1.5%

Key Highlights

▪ Ongoing Drilling to Significantly Increase Mineral Resource

▪ Grota do Cirilo: 3 close large ore bodies with similar high-quality mineralogy 52,4 Mt of Total Resource:

▪ 43,6 Mt Resources at Phase 1 and 2 at 1.48% Li2O Grade

▪ >20,000 hectares of properties (200 km2), 27 mineral rights

▪ Drilled only 4 out of 9 lithium former mines. 7 Additional Targets Remain

▪ Sigma has been amongst the top 10 investors in core drilling in Brazil since 2014: over US$20mm

▪ Proximity of Deposits brings CAPEX economies of scale to plant

▪ Focus on high-grade and high purity formal artisanal mines

Note: For Phase 1 refer to Xuxa Feasibility Study announcement on October 7th, 2019. For Phase 2 refer to PEA results announcement on June 2, 2021. Phase 3 numbers are company estimates.

Key Milestones Achieved

32

• Bulk earthworks initiated as Sigma enters into the construction phase

• Engaged Brazilian construction and engineering firm Promon for Phase 1 of the Grota do Cirilo Project, joining Primero

• Donated 150 hectares of forest land to create state park, part of its carbon “in-setting” initiatives to decrease footprint

• Delivered an agreement for the creation of an Independent Development Agency as part of its commitment to the towns where the project is situated• Filed Preliminary Economic

Analysis Report for Phase 2: Doubling production capacity to 440,000tpa

1

2

3

4

5

Sigma’s Corporate Strategy

33

Stage 2 Stage 3Stage 1

• Become one of the only three funded projects to start production in 2022 (1)

• Ride the wave of lithium supply deficit from 2022 onwards

• Continuous drilling work streams to increase resources

2022 - 2023 2023-2024 2024+

• Double plant production capacity in 2023 to 66,000t LCE becoming world top 3 lithium producer (2)

• Increase Grota do Cirilo Life of Mine to additional 13 years (2)

• Scale up with industry growth

• Explore intermediate chemical opportunities (lithium sulphate) leveraging in Brazilian renewable power source

Notes:(1) Sigma Lithium, Core Lithium and Lithium Americas; (2) As of PEA results announcement on June 2, 2021

Appendix I. Lithium 101

35

The Time is Right: EV Transition Boosts Lithium Demand, butPlayers Cannot Catch Up

Key Challenges for New Lithium Mining Players

Time to Build a Mine (5-7

Years)

Environmental Concerns

High LithiumGrade

Requirementsfor Batteries

Securing Top Buyers & Meeting Demand on Time

ComplexRequired

Infrastructure

Location ofSupply

Transition to EVs Supports Global Carbon Emission Reduction Initiatives(Annual lb of CO2 Equivalent Emissions Per Vehicle)

0

2.000

4.000

6.000

8.000

10.000

12.000

14.000

BEV PHEV HEV Gasoline

64% LessCO2

Emissions

Increasing Demand and Significant Challenges for New Entrants Create a Perfect Opportunity for Sigma to Tackle the Market

Lack ofFinancing

Building & Execution Risk

Source: Mordor Intelligence, US Department on Energy(1) BEV signifies battery electric vehicle, PHEV signifies plug-in electric behicle, and HEV signifies hydrid electric vehicle

36

Supported by favorable regulatory measures,

auto OEMs commitments and corporate sustainability

Offer 25 EVs in 2023

Offer EV Version of all

Models by 2022

All Electric Line-Up by

2025

100% of Rides in EVs in

US/EU by 2030

100k EVs Order

10K Electric Delivery Vans

Order

Battery will take 92% of lithium

demand by 2025 vs. 68% in

2020

28.6x

4.1x

2.9x

Gigafactory Battery Capacity Evolution(GMh)

▪ Biden to transition the entire US Gov. fleet to EVs

▪ Record # of ~100 pure EV models are set to debut by 2025

▪ U$400bn in federal procurement for key clean energy inputs

▪ Setting a goal of raising the ratio of hybrids to 75% of all gasoline cars by 2030 and 100% by 2035

▪ Two-year EV incentive extension to 2022

44

330

17

129

1.365

489

2020 2025

▪ 37.5% reduction of EU fleet-wide average emissions for new cars by 2030

▪ Subsidies, tax incentives, grants, and ICE vehicle bans across the EU

Grow 2025x2020

Source: Wall Street Research, and Wood Mackenzie(1) Roskill report as of Aug-20. battery linked applications includes industrial, motive products, portable electronics, power devices, electric stationary storage, automotives (xEV)

EV Producers Require Accelerated Lithium Supply as Battery Producing Capacity Grow

The Lithium Market Opportunity: Renewed Green Agenda and Rise of EVs Dramatically Accelerating Lithium Demand

37

2%5%

9%10%

>30%

0%

10%

20%

30%

40%

46%

34%

46%

22%22%

Electric Vehicles as a % of Total Sales(‘000 Units, %, RHS)

Forecast in 2019 Actual Forecast in 2021

2018 2020 2025

Global EV Sales and Market Share(BEV and PHEV, ‘000 & %)

Others

45%40%33%

36%22%

25%

2.082

8.717

15.549

2018 2023 2025

1.166 5.597

13.734

4%

20%

48%

2018A 2025E 2030EChina EV Penetration Percentage

416

6.219

10.299

8%

34%

58%

2018A 2025E 2030EEurope EV Penetration Percentage

EV Sales and Penetration in China(‘000 Units, %)

EV Sales and Penetration in Europe(‘000 Units, %)

Source: GRU Group, EV World, IHS Market, Wall Street Research(1) BEV refers to battery electric-vehicle and PHEV refers to plug-in hybrid electric vehicle

Inflection Point in EV Growth Trajectory: Still a Lot of New Demand to Come

38

0

100

200

300

400

500

600

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

2019 2020 2021

2020 2021 2022 2023 2024 2025 2035

Global Production Units, 1Q21

EV Production Units

0

500,000

North America161,000 units

1,20 Production ratio

EU &EFTA & UK337,000 units

0.78 Production ratio

Rest of Asia93,000 units

2.64 Production ratio

China495,000 units

1.02 Production ratio

+88%

+101%

+183%

+257%

Subsidy extended for 2 years in 2020Subsidy will gradually reduce until 2022

Subsidy was increased under the COVID-19 packageSubsidy increased to maximum value, and will run through 2025

Subsidy introduced in 2019 at €6,000

Subsidy gradually decreasing until 2030

Introduced in 2019 for a 3 year period of up to 50% of the battery cost

Introduced in 2016 at a maximum of $7,700

US will have gas emissions by 2030

Cars 0 emission by 2035All cars LCV &

pure electric by 2030

Global PC & LDV EV Sales by Month(‘000 Units per Month)

Source: Rho Motion(1) PC refers to personal vehicles, while LDV refers to light-duty vehicle

A Tight Market Heading Rapidly into a Deficit Even if New Projects Come Online

39

LithiumHydroxide

Market SizeCAGR 21-30: 19.0%

LithiumCarbonate

Market SizeCAGR 21-30: 18.7%

Demand by Lithium Compound(%)

▪ Lithium Carbonate has dominated the market until recently,

a trend that has changed with the new technologies using

hydroxide that increase battery performance

▪ Lithium Carbonate is a lithium compound which

associates with carbonate to become a salt, mainly

from underground brine pools

▪ Lithium Hydroxide is a compound that decomposes at

a lower temperature than carbonate, allowing for the

battery cathode producing process to be more

sustainable, and the final product to be more long-

lasting

Processing Costs: Hydroxide Production is Becoming Cheaper as Technologies Evolve($/t)

73%

40%

27%

60%

2018 2030

Lithium Carbonate Lithium Hydroxide

0

2.000

4.000

6.000

8.000

10.000

12.000

0 100 200 300 400 500 600 700 800

LiOH:20202025

Carbonate:20202025Business Cost

Cumulative Production (kt)

Next Generation Lithium Cathode Requirements: LessCarbonate and more Hydroxide(%)

0%

20%

40%

60%

80%

100%

2015 2020 2025 2030

Lithium Carbonate Lithium Carbonate/Hydroxide Lithium Hydroxide

Source: Source: Magna Intelligence, Benchmark Mineral Intelligence, and Mordor

Appendix II. Pre-Construction and Detailed Engineering Update

41

Phase 2 Production Line

Phase 1 Production Line

Common Infrastructure

Modular processing production lines

Increase scale with marginal capex only

Most of capex deployed for Phase 1 (“common infrastructure)

Design contemplates features for seamless phase 2 expansion (trade-off studies)

Size of DMS

Size of crusher

Crushing plant layout and fines DMS storage of crushed materials

Fines DMS

Design confirmations (dry stacking, iron removal, reflux classifier)

Trade-Off Studies

Modular DMS (Dense Media Separation) Processing Plant – Simplicity to Scale

Features of Modular Plant

Environmental State-of-the-Art Equipment, Automated and Digitally Controlled“Green-Tech” Plant

Investment Plan Overview - Detailed Engineering Pre-Construction of Plant for Phase 1 Production

42

▪ Bulk earth moving for foundations starts in 3Q21

▪ Detailed engineering concludes and final capex costing (FEL-3)

Plant

Pre-Construction Plant

Detailed Engineering

Construction Production Permitting

4Q20 ✓ Geotech drilling

1Q21✓ Foundation

modeling✓ Trade Off Studies

2Q21✓ Structural

calculations✓ Design

Confirmations

3Q21

✓ Final Designs✓ Implementation

Capex (Fel-3)✓ PEP

✓ Long Lead Item

✓ Bulk Earth Moving for Foundations

4Q21✓ Plant Eletro

mechanical Build

1Q22✓ Electronics Digital

Control Panels

2Q22✓ Plant

Commissioning

3Q22 ✓ Operating License

Methodology

Preliminary PEP

Definitive PEP

Application of PEP

43

Promon

100 Site Wide Bulk Earthworks Brazilian Engineer

200 Crushing

Civil ConcreteStructure SteelMechanical EquipmentPipingPlateworkElect, Insta & ControlsCommunication

PrimeroMetsoMetsoPrimeroMetsoPrimeroBrazilian Engineer

300 Wet Plant

Civil/ConcreteStructural SteelMechanical EquipmentPipingPlateworkElect, Inst & ControlsCommunications

PrimeroPrimeroPrimeroPrimeroPrimeroPrimeroBrazilian Engineer

600 Infrastructure Power/Water/Buildings/Etc. Brazilian Engineer

700 MiningMining GeneralMining Facilities

Mining ContractorMining Contractor

WBS AreaDetailed

EngineeringWork Breakdown

Structure

Firm @ Construction

Oversight Execution

Brazil Engineer Brazilian EPCM

Promon Brazilian EPCM

Primero Brazilian EPCM

Primero Brazilian EPCM

U & M U & M

U & M (Mining)

Project Execution Plan Work Allocation: Engineering Strength

44

IPA Front End Loading

FEL1 FEL2 FEL3

AACE Usage (18R-97)

Study or Feasibility Capex Authorization

EstimatingMethodology

Factored Calculated Detailed Detailed

Contingency 15% to 20% 10% to 15% 5% to 10% 0% to 5%

OtherJuniors

Definitive Feasibility Study

Basic Engineering

Detailed Engineering

Project Execution Plan

FEL3 Accuracy of Capex

No Cutting Corners: Sigma takes a detailed execution approach without sacrificing time to market

Typical Junior Mining Approach

Best-in-class Engineering Partners

✓

Project StagePre

FeasibilityFeasibility

Detailed Engineering

Implementation

Extensive experience

building lithium plants

Differentiated Risk Mitigation Plan and Best-in-ClassEngineering Partners

Outstanding Mineralogy Enables Simple DMS Process with No Floatation Required to Achieve Good DMS Recovery Results

45

Xuxa Pit Mining Truck Primary Crusher Secondary CrusherTertiary Crusher Dry Screens 10mm Crushed Ore Front End Loader

Wet Screens Coarse Primary DMS D&R Screen Coarse Secondary DMS

D&R Screen Ore Sorter Coarse DMS Concentrate

Rolls Crusher

Reflux ClassificationFines Primary DMS D&R Screen Fines Secondary DMS D&R Screen Magnetic Separation

Fines DMS Concentrate

Wet Screen Reflux Classification D&R Screen Magnetic Separation

Front End Loader

Ultrafines DMS Ultrafines DMS Concentrate

Horizontal Belt Filter

Rejects Stockpile Mining TruckThickener Dry Strack Tailings

Wet Screens Coarse Primary DMS D&R Screen

Dry

T

aili

ng

s

Pate

nte

d G

ree

n B

en

efi

ciat

ion

to

P

re C

he

mic

al L

ith

ium

C

on

ce

ntr

ate

Processes Xuxa Ore Through a Low Capex Dense Media Separation Concentrator

Appendix –Sigma Investment Highlights

Quality Production Coming Online at the Perfect Time

Paved Path for a Full Steam Start… …at a Key Strategic

Location

✓Fully funded project with technical work, approvals and permits(1)

✓

1st product batch to hit the market in 2022, at the right time to meet the increasing demand driven by Electric Vehicles

✓ Construction starting in 3Q 2021

✓

Tolling agreement with main refining companies with flexibility to convert the high-quality spodumene into battery-grade hydroxide or carbonate

Legend

Deposit

Grota do Cirilo

Xuxa

Barreiro

NC

Lavra doMeio

Murial

~6 km

Located in Minas Gerais, a mining-friendly jurisdiction with existing

infrastructure and at significantly low cost

47(1) Project Finance under MoU

48

Finalized 1st

phase of mineral

exploration Convertible

bonds offering

Capital Markets

Acquired Margaux “Shell”

Filed NI-43-101

RTO / IPO

Closed Alliance with

Mitsui

Pilot Plant and Project

Development

LI / LP Environmental

License Obtained

Achievements Recognized in

ESG Case Study (COP-19)

2020

Project Finance Signing

Detailed Engineering

2021

Fully Funded(1)

20182017

2019

2015

Sigma to Progress from Exploration to Fully-Funded to Near Term Production in 2022 and Clear Investment Plan to Double Capacity in 2023

Control Group Established

Strategic Partnership

✓ 2x size of Company

▪ 2x Reserves

✓ Plant Commission

✓ Phase I (Xuxa) Production

✓ Debt Closing

✓ Enhanced Agreement w/ Mitsui

✓ UN Climate Week Net Zero Achievement

(1) Project Finance under MoU

A Successful Story Ready to Enter Into its Highest Growth Chapter

World-Class Corporate Governance

49

Board Member Technical Committee Audit Committee

Corporate Governance,

Nomination and Compensation

Committee

Finance Committee

Gary Litwack

Frederico Marques

Calvyn Gardner

Ana Cabral

Marcelo Paiva

Vicente Lobo1

Wes Roberts1

Chair of the Committee

Member of the Committee

Board Members are Active Participants of Sigma’s Committees, Ensuring the Highest Governance Standards

(1) Board Advisors

50

Marcelo Paiva, CFA

Corp. Finance & Investor Relations Director

Gary LitwackIndependent

Director

Frederico Marques

Independent Director

Dedicated team has been extremely successful in reaching DFS at record speed, despite low lithium prices, a result not only of the quality of the asset, but also of

the team’s professionalism and commitment to the project

Calvyn Gardner CEO &

Co-Chairperson

Ana CabralChief

Sustainability Officer &

Co-Chairperson

Vicente LoboCo-Chairman

Wes RobertsCo-ChairmanCo-Founder

CEO

20+ Years Co-Founder

Mittal Family Office

Senior Partner

Mining Committee Chair

Founding Partner at S4G Incand

New Board Member

Independent Director

Post-US Listing

Executive Directors Board Advisors

Support by a Committed Sponsor Team with Broad Industry Expertise…

… And Highly Technical Management Team

Calvyn GardnerCEO

Ana CabralPresident & COO

Rinaldo StefanProject Officer

Colette WardenProcess Engineer

Iran ZanOperations Director

Dyonn HageSenior Geotechnical Geologist

Maria José SallumChief Sustainability Officer

Daniel AbdoBusiness Development Director

Patricia Duarte LaraMining & Mineral Rights Affairs

Vitor OrnelasBusiness Development Manager

Marina BernardiniCorp. Sec. & Director, Legal Affairs

Vicente LoboTechnical Committee

Andre BankoPhD Mineralogy

Kessianne LimaQA/QC Geologist

Wes RobertsTechnical Committee

51

Utpal GoshProject Officer

Felipe PeresFinancial & Controller VP

Marcelo Paiva, CFACorporate Finance & IR Director

Hugo RibeiroOperations Manager

Guilherme GuimarãesChief Finanical Officer

Mission, Vision & Values

52

To provide ultra-high quality lithium

pre-chemical to battery-chain clients

Mission

Vision

Values

To become a world-class, low-cost,

high-quality lithium producer to help

drive the EV movement

▪ Environmental Preservation

▪ Low-Carbon Lithium▪ UN Development Goals▪ Socioeconomic Impact▪ Adherence to

Compliance & Governance Standards

ESG

ESG-Centric Strategy: Practices are Measured as per the UNSustainable Development Goals

Corporate Mission(UN Goals)

“E” Environmental “G” Governance“S” Social

United Nation Goals Are Covered by Each ESG Workstream at Sigma (15 out of a total of 17)

54

Short-Term Impact

240,000 Protected

People by Sigma's COVID Actions

12,000 Liters of Hypochlorite

Delivered and 840 kg

of Alcohol Sanitizer

16 Hospitals, Clinics,

and Supplied Entities

ModelingSupport on Mapping

Stakeholders and Modulation of

Management Models

StateSupport, Along with Various

Companies, Entities & Organizations

AnchoringInitial Grant for the Project

as an Anchor Company

Leading RoleIn the creation of a

Economic Diversification Bureau

4 Areas of Focus: Investment

Intelligence, Territory Promotion, Investment Facilitation, and

Advocacy

Full SupportFrom Sigma’s Management

to Conduct Mentoring, Hiring and Economic

Feasibility Studies

Sigma is a True ESG Champion, Fully Committed to Positively Impact the Environment and Its Stakeholders

Mid-Term Impact

Long-Term Impact

6,000 Food

Baskets Delivered over 10 Months

Sigma’s ESG Mission: Delivering Constant Impact

55

Sigma Actions in Times of Pandemic

56

Distributed basic food baskets to 2,400 people since the start of the Pandemic

Protected 240,000 people

Donated 12,000 liters of disinfectants and 840kg of gel sanitizer

Supplied sanitizing items to 16 hospitals, clinics, and entities

Distribution of prevention booklets

Community Action Plan

Exemplary community partnership in fighting COVID-19, exemplifying its ESG-focused

mission

Best-in-class high risk protocols to ensure workplace safety and operations continuity

Internal Covid-19 Protocol

24 hour temperature testing at entrance and contractors are required to submit daily temperature tests

Mandatory usage of masks within the central office and prohibited access of people who do not work at the office

Constant disinfection at bathrooms and meal breaks to be set outside the building

Non essential maintenance suspension and contractors and others required to meet outdoors

57

Sigma “Walk the Talk” of ESG-Centric Strategy: EnvironmentalPreservation and Expansion of Licenses

Sigma decided to sacrifice 20% of its mineral reserves in first deposit VOLUNTARILY PRESERVE aseasonal River creek running through it: PREVENTED relocation of families riverside

Preserved area became source of Carbon In-Setting Credits

Phase 1 – Expanded Environmental License –Integrated Production Plant Tailing for Phase 2