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Capstone Mining Corp. Announces Filing of Preliminary Base Shelf Prospectus for Future Financial Flexibility and Updated Technical Report for Pinto Valley

Financings Technical Reports (NI 43-101)

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June 11, 2021

Capstone Mining Corp. Announces Filing of Preliminary Base Shelf Prospectus for

Future Financial Flexibility and Updated Technical Report for Pinto Valley

(All amounts in US$ unless otherwise specified)

Vancouver, British Columbia - Capstone Mining Corp. (“Capstone” or the “Company”) (TSX:CS) is

pleased to announce that it has filed a preliminary base shelf prospectus (the “Shelf Prospectus”) with the

securities commissions in each of the provinces and territories of Canada.

The Shelf Prospectus, upon a receipt for the final base shelf prospectus, would allow Capstone to make

offerings up to C$500,000,000 of common shares, warrants, subscription receipts, units, debt securities,

share purchase contracts, or any combination thereof, from time to time over a 25 -month period. The

specific terms of any future offering of securities (if any) will be set forth in a shelf prospectus supplement.

Capstone has filed this base shelf prospectus for future financial flexibility and has no immediate intentions

to undertake an offering. As reported in its quarterly financial statements ending March 31, 2021, Capstone

had a cash position of $44.81 million and was debt-free2. Subsequent to March 31, 2021, Capstone received

$30 million as an upfront deposit on the Wheaton Precious Metals Gold Stream Agreement.

This news release shall not constitute an offer to sell, or a solicitation of an offer to buy, any securities nor

shall there be any sale of securities in any jurisdiction in which an offer, solicitation or sale would be unlawful

prior to registration or qualifications under the securities laws of any such jurisdiction.

A copy of the preliminary Shelf Prospectus, and copies of the final base shelf prospectus and any shelf

prospectus supplements that may be filed in the future, can be found under the Company's SEDAR profile

at www.sedar.com, or may be obtained by request to Wendy King, Senior Vice President, Risk, ESG,

General Counsel and Corporate Secretary, Suite 2100 – 510 West Georgia Street, Vancouver, BC, V6B

0M3, [email protected]

Filing of Pinto Valley Technical Report

In addition, the Company has filed on SEDAR a technical report titled “NI 43-101 Technical Report on the

Pinto Valley (“PV”) Mine, Arizona, USA" (the “Technical Report”) updating the PV3 life of mine plan.

The Technical Report was prepared in accordance with the Canadian Securities Administrator’s National

Instrument 43-101 Standards of Disclosure for Mineral Projects (“NI 43-101”), and is available for review

under the Company’s profile on SEDAR at www.sedar.com and on the Company’s website a t

capstonemining.com.

The Company expects to release an updated NI 43-101 Technical Report in 2022 presenting the results of

several initiatives aimed at increasing the value of the Pinto Valley Mine, including a PV4 pre -feasibility

study and studies of Eriez Hydrofloat coarse particle flotation and Jetti catalytic technology.

1.Cash and cash equivalents and short-term investments of $44.8 million as at March 31, 2021

2.Debt Free is in reference to zero long term debt balance as at March 31, 2021

ABOUT CAPSTONE MINING CORP.

Capstone Mining Corp. is a Canadian base metals mining company, focused on copper. We are committed

to the responsible development of our assets and the environments in which we operate. Our two producing

mines are the Pinto Valley copper mine located in A rizona, US and the Cozamin copper -silver mine in

Zacatecas State, Mexico. In addition, Capstone owns 100% of Santo Domingo, a large scale, fully

permitted, copper -iron-gold project in Region III, Chile, as well as a portfolio of exploration properties.

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Capstone's strategy is to focus on the optimization of operations and assets in politically stable, mining -

friendly regions, centred in the Americas. Our headquarters are in Vancouver, Canada and we are listed

on the Toronto Stock Exchange (TSX). Further information is available at www.capstonemining.com.

This news release has been reviewed and approved by Brad Mercer, P. Geol., Capstone's Senior Vice

President and Chief Operating Officer, a Qualified Person a nd the person who oversees operational and

exploration activities at Pinto Valley Mine.

CAUTIONARY NOTE REGARDING FORWARD-LOOKING INFORMATION

This document contains “forward-looking information” within the meaning of Canadian securities legislation

and “fo rward-looking statements” within the meaning of the United States Private Securities Litigation

Reform Act of 1995 (collectively, “forward -looking statements”). These forward -looking statements are

made as of the date of this document and the Company does not intend, and does not assume any

obligation, to update these forward -looking statements, except as required under applicable securities

legislation.

Forward-looking statements relate to future events or future performance and reflect our expectations or

beliefs regarding future events and the impacts of the ongoing and evolving COVID-19 pandemic. Forward-

looking statements include, but are not limited to, statements with respect to the filing of a final base shelf

prospectus, future offerings of securities and updated technical reports or technical information. In addition,

the potential effects of the COVID-19 pandemic on our business and operations are unknown at this time,

including Capstone’s ability to manage challenges and restrictions arising from COVID-19 in the communities

in which Capstone operates and our ability to continue to safely operate and to safely return our business to

normal operations. The impact of COVID-19 to Capstone is dependent on a number of factors outside of our

control and knowledge, including the effectiveness of the measures taken by public health and governmental

authorities to combat the spread of the disease, global economic uncertainties and outlook due to the

disease, and the evolving restrictions relating to mining activities and to travel in certain jurisdictions in which

we operate. In certain cases, forward -looking statements can be identified by the use of words such as

“anticipates”, “approximately”, “believes”, “budget”, “estimates”, expects”, “forecasts”, “guidance”, intends”,

“plans”, “scheduled”, “target”, or variations of such words and phrases, or statements that certain actions,

events or results “be achieved”, “could”, “may”, “might”, “occur”, “should”, “will be taken” or “would” or the

negative of these terms or comparable terminology. In this document certain forward-looking statements are

identified by words including “anticipated”, “expected”, “guidance” and “plan”. By their very nature, forward-

looking statements involve known and unknown risks, uncertainties and other factors that may cause our

actual results, performance or achievements to be materially different from any future results, performance

or achievements expressed or implied by the forward -looking statements. Such factors incl ude, amongst

others, risks related to inherent hazards associated with mining operations and closure of mining projects,

future prices of copper and other metals, compliance with financial covenants, surety bonding, our ability to

raise capital, Capstone’s ability to acquire properties for growth, counterparty risks associated with sales of

our metals, use of financial derivative instruments and associated counterparty risks, foreign currency

exchange rate fluctuations, market access restrictions or tariffs , changes in general economic conditions,

availability of water, accuracy of Mineral Resource and Mineral Reserve estimates, operating in foreign

jurisdictions with risk of changes to governmental regulation, compliance with governmental regulations,

compliance with environmental laws and regulations, reliance on approvals, licenses and permits from

governmental authorities and potential legal challenges to permit applications, contractual risks including but

not limited to, our ability to meet the completi on test requirements under the Cozamin Silver Stream

Agreement with Wheaton Precious Metals, our ability to meet certain closing conditions under the Santo

Domingo Gold Stream Agreement with Wheaton Precious Metals, acting as Indemnitor for Minto

Exploration Ltd.’s surety bond obligations post divestiture, impact of climate change and changes to

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climatic conditions at our Pinto Valley and Cozamin operations, changes in regulatory requirements and

policy related to climate change and GHG emissions, land reclamation and mine closure obligations, risks

relating to widespread epidemics or pandemic outbreak including the COVID -19 pandemic; the impact of

COVID-19 on our workforce, suppliers and other essential resources and what effect those impacts, if they

occur, would have on our business, including our ability to access goods and supplies, the ability to

transport our products and impacts on employee productivity, the risks in connection with the operations,

cash flow and results of Capstone relating to the unknown duration and impact of the COVID-19 pandemic,

uncertainties and risks related to the potential development of the Santo Domingo Project, increased

operating and capital costs, increased cost of reclamation, challenges to title to our mineral propertie s,

increased taxes in jurisdictions the Company operates or is subject to tax, changes in tax regimes we are

subject to and any changes in law or interpretation of law may be difficult to react to in an efficient manner,

maintaining ongoing social license to operate, dependence on key management personnel, potential

conflicts of interest involving our directors and officers, corruption and bribery, limitations inherent in our

insurance coverage, labour relations, increasing energy prices, competition in the mining industry

including but not limited to competition for skilled labour, risks associated with joint venture partners, our

ability to integrate new acquisitions and new technology into our operations, cybersecurity threats, legal

proceedings, and othe r risks of the mining industry as well as those factors detailed from time to time in

the Company’s public filings, including the Shelf Prospectus, which are filed and available for review under

the Company’s profile on SEDAR at www.sedar.com. Although the Company has attempted to identify

important factors that could cause our actual results, performance or achievements to differ materially

from those described in our forward-looking statements, there may be other factors that cause our results,

performance or achievements not to be as anticipated, estimated or intended. There can be no assurance

that our forward -looking statements will prove to be accurate, as our actual results, performance or

achievements could dif fer materially from those anticipated in such statements. Accordingly, readers

should not place undue reliance on our forward -looking statements.

For further information please contact:

Jerrold Annett, SVP, Strategy and Capital Markets

647-273-7351

[email protected]

Kettina Cordero, Director Investor Relations & Communications

604-262-9794

[email protected]