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NOTICE TO READER Re: Excellon Resources Inc. To whom it may concern, Please note that a correction to the release originally filed on

Corporate Updates

September 17, 2020

NOTICE TO READER

Re: Excellon Resources Inc.

To whom it may concern,

Please note that a correction to the release originally filed on September 17, 2020 under SEDAR project

number 03113859 is attached as a second submission to the original filing project. The correction relates to

a typo in the table where “lbs” was incorrectly used instead of “oz”. No other content has changed.

www.excellonresources.com

EXCELLON UPDATES EVOLUCION

MINERAL RESOURCE ESTIMATE

Toronto, Ontario – September 17, 2020 – Excellon Resources Inc. (TSX:EXN, EXN.WT; OTC:EXLLD and

FRA:E4X2) ("Excellon" or the “Company") is pleased to provide an updated Mineral Resource Estimate

(“MRE”) for the Calvario and Lechuzas Zones on the Evolución Project in Zacatecas, Mexico as at

July 31, 2020.

2020 Evolución MRE Highlights

• Updated MRE incorporates 17,120 metres of additional surface drilling completed in the

resource area from June 2018 to December 31, 2019

• Indicated resource of 6,407,000 tonnes at 170 g/t silver equivalent (“AgEq”) representing

35,091,000 AgEq ounces

• Inferred resource of 14,960,000 tonnes at 135 g/t AgEq representing 64,813,000 AgEq ounces

• Expansion drilling being planned to test the strike extension of the mineralized zones and follow

up on parallel structures, where grab samples taken during detailed mapping in 2020 returned

values of up to 2.30 g/t Au, 203 g/t Ag and 10.4% Pb

“We discovered the Lechuzas zone adjacent to our Miguel Auza mill in late 2018 and identified a

sizeable mineral resource that, when combined with the historic Calvario Vein, is similar to other

deposits currently producing in the region,” stated Ben Pullinger, SVP Geology. “This MRE represents a

sizeable addition to Excellon’s overall metal inventory and a foundation to further advance the project,

as both Lechuzas and Calvario are open for extension along strike and at depth.”

Resource Summary for Evolución Project

The MRE will be included in an updated technical report prepared by SRK Consulting (Canada) Inc.

(“SRK”) under National Instrument 43 -101 ("NI 43 -101"), which will be published on SEDAR

(www.sedar.com) in the coming weeks.

Mineral Resource Statement, Evolución Project, Zacatecas, Mexico

Grade Contained Metal

Tonnes Ag Au Pb Zn AgEq Ag Au Pb Zn AgEq

Category Zone (000′ t) (g/t) (g/t) (%) (%) (g/t) (000′ oz) (000′ oz) (000′ lb) (000′ lb) (000′ oz)

Indicated

Calvario 6,407 64 0.09 1.00 1.14 170 13,154 19 140,741 161,548 35,091

Total

Indicated 6,407 64 0.09 1.00 1.14 170 13,154 19 140,741 161,548 35,091

Inferred

Calvario 5,626 53 0.09 0.82 1.08 149 9,570 16 102,223 134,447 26,902

Lechuzas 9,335 30 0.11 0.71 1.18 126 8,953 33 145,235 243,300 37,911

Total

Inferred 14,960 39 0.10 0.75 1.15 135 18,524 49 247,459 377,747 64,813

Notes:

1. Mineral Resources are estimated pursuant to NI 43-101 with an effective date of August 31, 2020.

2. Mineral Resources are reported at a cut -off grade of 90 g/t AgEq. Cut-off grades are based on a silver price of US$17 per troy

ounce and a silver recovery of 76 %; a gold price of US$1,550 per troy ounce and recovery of 20%; a lead price of US$0.90 per

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pound and recovery of 90%; and a zinc price of US$1.15 per pound and recovery of 88%.

3. Mineral Resources that are not Mineral Reserves do not necessarily demonstrate economic viability. All figures have been rounded

to reflect the relative accuracy of the estimates. Composites have been capped where appropriate.

4. The mineral resources were estimated in conformity with the widely accepted CIM Estim ation of Mineral Resource and Mineral

Reserves Best Practices Guidelines (November 2019) and are reported in accordance with the Canadian Securities Administrators’

National Instrument 43-101.

5. The construction of the Mineral Resource model was a collaborat ive effort between Excellon and SRK personnel. Dr. Aleksandr

Mitrofanov, P .Geo. (APGO#2824) is responsible for resource wireframing, geostatistical analysis, grade estimation and

classification with senior review provided by Mr. Glen Cole, PGeo (APGO#1416).

The Lechuzas Zone was modelled in conjunction with a remodeling of the historical Calvario vein system.

The evaluation of mineral resources for these zones on the Evolución Project involved the following:

1. Validation and verification of the Excellon drill hole and analytical database and QA /QC

performance;

2. Construction of explicit wireframe domains for mineralization using geological indices and structural

trends;

3. Definition of resource domains;

4. Data conditioning (compositing and capping) for geostatisti cal analysis and variography and

determination of specific gravity;

5. Definition and interpolation of a 3D block model;

6. Validation, classification and tabulation;

7. Assessment of “reasonable prospects for eventual economic extraction” and selection of cut -off

grade and grade sensitivity analysis; and

8. Preparation of the MRE.

This model incorporates data from 239 drill holes (68,361 metres) completed by previous operators at

Calvario and 34 diamond holes (14,509 metres) completed by Excellon from 2018 to 2020 on the Lechuzas

zone. Additional work completed and integrated into the model included structural studies completed in

2018, oriented core data, petrographic studies, re-logging and re -assaying of historical mineral ized

intersections and a re-interpretation of the geology and mineralization of the studied area.

Mineral resource model ing of the Evolución Project in corporates lithological and structural geology

modeling and grade interpolation. SRK used the available data to create a geological model delimiting

the different mineralized domains in Leapfrog Geo™. The model comprises a total of twelve high -grade

veins (eight at Calvario and four at Lechuzas), and three low-grade haloes for each zone.

The high-grade vein domains were generated using a combination of geological descriptions, where they

were available, and AgEq values. The high -grade domains were constrained based on economic

composites greater than 10 g/t AgEq threshold and a maximum was te inclusion of 1 m etre. Low-grade

domains were modelled based on economic composites of 2 g/t AgEq threshold and a maximum of 3

metres waste inclusion, and further constrained using interval selections based on structural trends. The

AgEq calculations are based on a silver price of US$17.00 per troy ounce (t oz) and a silver recovery of 76%;

a gold price of US$1,550 per t oz and a gold recovery of 20%; a lead price of US$0.90 per lb and a lead

recovery of 90%; and a zinc price of US$1.15 per lb and a zinc recovery of 88%. Recovery values are based

upon the total overall recovery values documented by R oscoe Postle Associates Inc. (2008), determined

by the metallurgical testwork completed by Silver Eagle Mines Inc.

Approximately 12% of the tonnage within the MRE (26% of the indicated tonnage and 6% of the inferred

tonnage) is located within the La Antigua concession (part of the Evolución Project), which is the subject

of litigation between a subsidiary of Excellon and a plaintiff. The initial decision in respect of this litigation

does not affect Excellon’s contractual rights to this concession.

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The MRE was prepared in accordance with the Canadian Institute of Mining, Metallurgy and Petroleum’s

(CIM) ‘Mineral Resources and Mineral Reserves Best Practices’ guidelines (November 2019) and is

classified per the CIM ‘Definition Standards for Mineral Resources and Mineral Reserves’ (May 2014).

The Evolución property covers 45,000 hectares (450 km2) and 35 kilometres of strike in one of the world’s

premier silver mining districts, known as the Fresnillo trend. The Lechuzas and Calvario Zones are hosted

within the Caracol Formation, which hosts the most significant deposits on the Fresnillo trend. Precious

and base metal mineralization is associated with structures featuring carbonate and quartz veining that

crosscut the host rocks. Pyrite, sphalerite, and galena are the most commonly observed sulphide

minerals. The property includes a conventional grinding and flotation mineral processing facility, through

which the Company currently processes ore from its Platosa Mine. The mineral processing facility

currently has nameplate capacity of approximately 800 tonnes per day (“tpd”), with a 650 tpd ball mill in

operation and a second, 150 tpd ball mill on standby, with opportunities available for further expansion.

Ongoing Exploration at Evolución

Detailed mapping and surface sampling are underway on the Evolución Project. Numerous samples with

anomalous geochemical signatures have been identified in t he target area; these are thought to be the

surface expressions of epithermal alteration and associated mineralization. The program will be used to

aid in structural modeling and targeting for future drilling.

Qualified Person

Mr. Ben Pullinger, P.Geo., Senior Vice President Geology, has acted as the Qualified Person, as defined in

NI 43-101, with respect to the disclosure of the scientific and technical information contained in this press

release.

Update on Trading Symbols on the OTC Pink and Frankfurt Exchanges

Further to the Company’s press release on September 10, 2020 announcing the effective date of the

consolidation of the Company’s common shares on a one -for-five basis, the following adjustments were

made to trading symbols on the OTC Pink and Frankfurt Exchanges:

• On the OTC Pink, Excellon’s symbol was changed from “EXLLF” to “EXLLD”. The new symbol will

remain in effect for a period of 20 trading days after the consolidation was effected or until the

Company’s common shares start trading on the NYSE American , LLC exchange (the “N YSE

American”), whichever comes first. Upon listing on the NYSE American, the common shares will

trade under the symbol “EXN” and trading on the OTC Pink exchange will cease;

• On the Frankfurt Stock Exchange, Excellon’s symbol was changed from “E4X1” to “E4X2”.

About Excellon

Excellon’s vision is to create wealth by realizing strategic opportunities through discipline and innovation

for the benefit of our employees, communities and shareholders. The Company is advancing a precious

metals growth pipeline th at includes: Platosa, Mexico’s highest -grade silver mine since production

commenced in 2005; Kilgore, a high quality gold development project in Idaho with strong economics

and significant growth and discovery potential; and an option on Silver City, a high-grade epithermal silver

district in Saxony, Germany with 750 years of mining history and no modern exploration. The Company

also aims to continue capitalizing on current market conditions by acquiring undervalued projects.

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Additional details on Excellon’s properties are available at www.excellonresources.com

For Further Information, Please Contact:

Excellon Resources Inc.

Brendan Cahill, President & CEO or

Ben Pullinger, SVP Geology

(416) 364-1130

[email protected]

www.excellonresources.com

Forward-Looking Statements

The Toronto Stock Exchange has not reviewed and does not accept responsibility for the adequacy or accuracy of the content of this Press Release,

which has been prepared by management. This press release contains forward -looking statements within the meaning of Section 27A of the

Securities Act and Section 27E of the Exc hange Act. Such statements include, without limitation, statements regarding the future results of

operations, performance and achievements of the Company, including potential property acquisitions, the timing, content, cost and results of

proposed work programs, the discovery and delineation of mineral deposits/resources/reserves, geological interpretations, proposed production

rates, potential mineral recovery processes and rates, business and financing plans, business trends and future operating rev enues. Although the

Company believes that such statements are reasonable, it can give no assurance that such expectations will prove to be correct. Forward-looking

statements are typically identified by words such as: believe, expect, anticipate, intend, estimate, postulate, and similar expressions, or are those,

which, by their nature, refer to future events. The Company cautions investors that any forward -looking statements by the Company are not

guarantees of future results or performance, and that actual results may differ materially from those in forward looking statements as a result of

various factors, including, but not limited to, variations in the nature, quality and quantity of any mineral deposits that may be located, significant

downward variations i n the market price of any minerals produced, the Company's inability to obtain any necessary permits, consents or

authorizations required for its activities, to produce minerals from its properties successfully or profitably, to continue its projected growth, to raise

the necessary capital or to be fully able to implement its business strategies. All of the Company's public disclosure filing s may be accessed via

www.sedar.com and readers are urged to review these materials, including the technical reports f iled with respect to the Company's mineral

properties, and particularly the September 7, 2018 NI 43-101 technical report prepared by SRK Consulting (Canada) Inc. with respect to the Platosa

Property. This press release is not, and is not to be construed in any way as, an offer to buy or sell securities in the United States.