First Amendment to Equity Distribution Agreement, dated as of February 15, 2024, by and among Hecla Mining Company and the sales agents party thereto

HECLA MINING COMPANY

FIRST AMENDMENT TO EQUITY DISTRIBUTION AGREEMENT

February 15, 2024

THIS FIRST AMENDMENT TO EQUITY DISTRIBUTION AGREEMENT (this “Amendment”) is entered into by and among Hecla Mining Company, a Delaware corporation (the “Company”), and BMO Capital Markets Corp., Scotia Capital (USA) Inc., BofA Securities, Inc., B. Riley Securities, Inc., Canaccord Genuity LLC, Cantor Fitzgerald & Co. Inc., CIBC World Markets Corp., Goldman Sachs & Co. LLC, H.C. Wainwright & Co., LLC, J.P. Morgan Securities LLC, RBC Capital Markets, LLC, Roth Capital Partners, LLC and, solely for purposes of Section 8(j) of the Agreement (as defined below), Credit Suisse Securities (USA) LLC (collectively, the “Original Agents”), and UBS Securities LLC (collectively, with the Company and the Original Agents, the “Parties”) to amend that certain Equity Distribution Agreement, dated as of February 18, 2021 (the “Agreement”), by and among the Company and the Original Agents, with respect to the issuance and sale from time to time of up to 60,000,000 shares of the Company’s common

stock, $0.25 par value per share. Capitalized terms used but not defined herein shall have the meanings ascribed to such terms in the Agreement.

WHEREAS, on February 15, 2024, by the giving of that certain Notice of Termination of Agent (the “Notice of Termination”), Credit Suisse Securities (USA) LLC exercised it right, in accordance with Section 6(b) of the Agreement, to terminate the Agreement as to itself, effective as of the close of business on Thursday, February 15, 2024 (the “Effective Date”); and

WHEREAS, in connection with the termination of the Agreement as to Credit Suisse Securities (USA) LLC, the Parties desire to amend the Agreement to (i) remove Credit Suisse Securities (USA) LLC as an Agent thereunder, (ii) join UBS Securities LLC as an Agent thereunder and (iii) modify certain provisions set forth therein, in each case, effective as of the Effective Date.

NOW, THEREFORE, in consideration of the covenants and agreements set forth herein and other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the Parties hereto, intending to be legally bound, do hereby agree as follows:

UBS Securities LLC

1285 Avenue of the Americas

New York, New York 10019

BMO Capital Markets Corp., Scotia Capital (USA) Inc., BofA Securities, Inc., B. Riley Securities, Inc., Canaccord Genuity LLC, Cantor Fitzgerald & Co. Inc., CIBC World Markets Corp., Goldman Sachs & Co. LLC, H.C. Wainwright & Co., LLC, J.P. Morgan Securities LLC, RBC Capital Markets, LLC, Roth Capital Partners, LLC, and UBS Securities LLC (collectively, the “Agents” and each individually, an “Agent”)

(a) Notices. Notices given pursuant to any of the provisions of this Agreement shall be in writing and, unless otherwise specified, shall be mailed, delivered or sent by email transmission (i) if to the Company, at the office of the Company, 6500 North Mineral

Drive, Suite 200, Coeur d’Alene, Idaho ###-###-####, Attention: Chief Executive Officer, Email: ***@***, with a copy at the same address to the attention of the General Counsel, (ii) if to any Agent, at the address of such Agent set forth in Schedule 4 hereto. Any such notice shall be effective only upon receipt. Any notice under Section 1 may be made by telephone, but if so made shall be subsequently confirmed in writing (which, with respect to the Agency Transactions contemplated by Section 1 only, may include, in the case of the Agents, electronic mail to any Authorized Company Representative, and in the case of the Company, electronic mail to the Agents).

UBS Securities LLC

1285 Avenue of the Americas

New York, New York 10019

Attention: Equity Syndicate

Email: ***@***

(Signature Pages Follow)

IN WITNESS WHEREOF, each of the Parties has caused this Amendment to be duly executed and delivered by its proper and duly authorized officer(s) as of the date first set forth above.

HECLA MINING COMPANY

By: /s/ David C. Sienko

Name: David C. Sienko

Title: Vice President and General Counsel

BMO CAPITAL MARKETS CORP.

By: /s/ Brad Pavelka

Name: Brad Pavelka

Title: Managing Director

SCOTIA CAPITAL (USA) INC.

By: /s/ John Cronin

Name: John Cronin

Title: Managing Director

BOFA SECURITIES, INC.

By: /s/ Christine Roemer

Name: Christine Roemer

Title: Managing Director

B. RILEY SECURITIES, INC.

By: /s/ Patrice McNicoll

Name: Patrice McNicoll

Title: SMD, Co-Head of Investment Banking

CANACCORD GENUITY LLC

By: /s/ Jennifer Pardi

Name: Jennifer Pardi

Title: Managing Director

CANTOR FITZGERALD & CO. INC.

By: /s/ Sage Kelly

Name: Sage Kelly

Title:

CIBC WORLD MARKETS CORP.

By: /s/ Eric Reuther

Name: Eric Reuther

Title: Managing Director

GOLDMAN SACHS & CO. LLC

By: /s/ Charles Park

Name: Charles Park

Title: Managing Director

H.C. WAINWRIGHT & CO., LLC

By: /s/ Edward D. Silvera

Name: Edward D. Silvera

Title: Chief Operating Officer

J.P. MORGAN SECURITIES LLC

By: /s/ Sanjeet Dewal

Name: Sanjeet Dewal

Title: Managing Director

RBC CAPITAL MARKETS, LLC

By: /s/ Michael Ventura

Name: Michael Ventura

Title: Managing Director, ECM

ROTH CAPITAL PARTNERS, LLC

By: /s/ J. Barry

Name: J. Barry

Title: Managing Director

UBS SECURITIES LLC

By: /s/ Christopher Siska

Name: Christopher Siska

Title: Managing Director

By: /s/ Jesse O’Neill

Name: Jesse O’Neill

Title: Executive Director

FOR PURPOSES OF SECTION 8(j) OF THE AGREEMENT ONLY:

CREDIT SUISSE SECURITIES (USA) LLC

By: /s/ Robert D’Addario

Name: Robert D’Addario

Title: Director