Independent Proxy Advisory Firms, ISS and Glass Lewis, Support Hudbay's Plan of Arrangement with Copper Mountain and Recommend Shareholders Vote "FOR"

o	The transaction makes "strategic sense" as it increases scale, diversification
and could result in a valuation re-rating
o	Have questions or need help voting? Contact Kingsdale Advisors:  
o	Hudbay Shareholders at 1-855-682-2031 (toll free in North America) 
o	Copper Mountain Shareholders / CDI holders at 1-855-682-2031 (toll free in
North America)
o	or email [e-mail]
o	Visit www.HudbayPOA.com or www.CopperMountainPOA.com for more details


Toronto, Ontario, June 2, 2023 - Hudbay Minerals Inc. ("Hudbay" or the
"company") (TSX, NYSE: HBM) and Copper Mountain Mining Corporation ("Copper
Mountain") (TSX: CMMC) (ASX: C6C) are pleased to announce that Institutional
Shareholder Services Inc. ("ISS") and Glass, Lewis & Co., LLC ("Glass Lewis"),
have recommended that shareholders vote FOR the previously announced transaction
whereby Hudbay will acquire all of the issued and outstanding common shares of
Copper Mountain pursuant to a court approved plan of arrangement under the
Business Corporations Act (British Columbia) (the "Transaction"). 

Both ISS and Glass Lewis are leading independent proxy advisory firms who, among
other services, provide proxy voting recommendations to pension funds,
investment managers, mutual funds, and other institutional shareholders. The
recommendations are consistent for both Hudbay and Copper Mountain resolutions
in connection with their respective special meetings of shareholders scheduled
to be held on June 13, 2023.

In reaching its recommendation, ISS stated the following for Hudbay: "Vote FOR
this resolution as the transaction is expected to be accretive to the company's
NAV per share, generate meaningful operational and cost synergies, provide scale
and diversification benefits, and could result in a potential valuation
re-rating."

In its Copper Mountain report, ISS says, "The transaction makes strategic sense
as it will result in a combined company with increased size, scale, and
diversification of production, development, and exploration assets". Permission
to use quotations from the ISS report was neither sought nor obtained.

On May 18, 2023, Hudbay and Copper Mountain filed a Joint Management Information
Circular ("the Circular") and related meeting materials (collectively with the
Circular, the "Meeting Materials") in connection with their respective special
meetings of shareholders scheduled to be held on June 13, 2023. The Meeting
Materials are available on SEDAR under each company's profile at www.sedar.com,
under Hudbay's profile on EDGAR at www.sec.gov, under Copper Mountain's profile
on the ASX at www.asx.com.au, on Hudbay's website at
https://www.hudbayminerals.com and on Copper Mountain's website at
http://www.cumtn.com and have been mailed to shareholders of both Hudbay and
Copper Mountain.  Shareholders are encouraged to review the Meeting Materials
prior to voting on the Transaction.

Proxy Voting Deadline
Shareholders are reminded that the Board of Directors of each of Hudbay and
Copper Mountain unanimously approved the Transaction and recommend that each of
their respective shareholders vote FOR the Transaction ahead of proxy voting
deadlines below:
o	Hudbay Shareholders:
o	Friday, June 9, 2023 at 10:30 a.m. EST
o	Copper Mountain Common Share and CDI holders: 
o	Common Shareholders: Friday, June 9, 2023 at 9:00 a.m. PST
o	CDI Holders: Wednesday, June 7, 2023 at 5:00 p.m. AWST

The Transaction

The Transaction involves a proposed acquisition by Hudbay of all of the issued
and outstanding Copper Mountain shares (other than Copper Mountain shares held
by dissenting Copper Mountain shareholders, if any) in exchange for Hudbay
shares by way of a court-approved plan of arrangement under the Business
Corporations Act (British Columbia). Under the Transaction, each Copper Mountain
shareholder (other than any dissenting Copper Mountain shareholders) will
receive 0.381 of a Hudbay share for each Copper Mountain share or Copper
Mountain CDI held. If the Transaction is completed, Copper Mountain will become
a wholly-owned subsidiary of Hudbay.

The consideration to be received by Copper Mountain shareholders represents a
premium of approximately 23% based on the 10-day volume-weighted average price
of the Hudbay shares and Copper Mountain shares on the Toronto Stock Exchange on
April 12, 2023, the last trading day prior to the announcement of the
Transaction.

In addition to shareholder approvals, the Transaction is subject to final court
approval and the satisfaction of certain other customary closing conditions for
transactions of this nature. The Toronto Stock Exchange has conditionally
approved the listing of the Hudbay common shares to be issued in connection with
the Transaction, and the requisite regulatory approval for the Transaction under
the Competition Act (Canada) has been obtained. It is currently anticipated that
the effective date of the Transaction will occur on or about June 20, 2023.

Shareholder Questions and Assistance with Voting

Hudbay Shareholders: If you have any questions or need assistance voting, you
can contact Kingsdale Advisors at 1-866-581-1571 (toll-free in North America) or
1-416-623-2514 (collect outside North America) or by email at
[e-mail]. To keep current with and obtain information
about voting your shares, please visit www.HudbayPOA.com.

Copper Mountain Shareholders: If you have any questions or need assistance
voting, you can contact Kingsdale Advisors at 1-855-682-2031 (toll-free in North
America) or 1-416-623-4172 (collect outside North America) or by email at
[e-mail]. To keep current with and obtain information
about voting your shares, please visit www.CopperMountainPOA.com.


About Hudbay Minerals Inc. 
Hudbay (TSX, NYSE: HBM) is a diversified mining company with long-life assets in
North and South America. The company's Constancia operations in Cusco (Peru)
produce copper with gold, silver and molybdenum by-products. Its Snow Lake
operations in Manitoba (Canada) produce gold with copper, zinc and silver
by-products. Hudbay has an organic pipeline that includes the Copper World
project in Arizona and the Mason project in Nevada (United States), and its
growth strategy is focused on the exploration, development, operation, and
optimization of properties it already controls, as well as other mineral assets
it may acquire that fit its strategic criteria. Hudbay's mission is to create
sustainable value through the acquisition, development and operation of
high-quality, long-life deposits with exploration potential in jurisdictions
that support responsible mining, and to see the regions and communities in which
the company operates benefit from its presence. Further information about Hudbay
can be found on www.hudbay.com.

About Copper Mountain Mining Corporation
Copper Mountain owns 75% of the Copper Mountain Mine, which is located in
southern British Columbia near the town of Princeton. The Copper Mountain Mine
produces approximately 100 million pounds of copper equivalent on average per
year. Copper Mountain trades on the Toronto Stock Exchange under the symbol
"CMMC" and Australian Securities Exchange under the symbol "C6C". Additional
information is available on Copper Mountain's web page at www.CuMtn.com.


For further information, please contact:
Hudbay
Candace Brule
Vice President, Investor Relations
[phone]
[e-mail] 

Copper Mountain
Tom Halton
Director, Investor Relations and Corporate Communications
[phone]
[e-mail]


Cautionary Note Regarding Forward-Looking Information
This release contains certain "forward looking statements" and certain
"forward-looking information" as defined under applicable Canadian and U.S.
securities laws. Forward-looking statements and information can generally be
identified by the use of forward-looking terminology such as "may", "will",
"should", "expect", "intend", "estimate", "anticipate", "believe", "continue",
"plans" or similar terminology. The forward-looking information contained herein
is provided for the purpose of assisting readers in understanding management's
current expectations and plans relating to the future. Readers are cautioned
that such information may not be appropriate for other purposes.

Forward-looking statements relate to future events or future performance and
reflect Hudbay's and Copper Mountain's expectations or beliefs regarding future
events. Forward-looking statements include, but are not limited to statements
with respect to the consummation and timing of the Transaction; approval by
shareholders of Hudbay and Copper Mountain; the satisfaction of the conditions
precedent to the Transaction; the strengths, characteristics and potential of
the Transaction; growth potential and expectations regarding the timing, receipt
and anticipated effects of court and other consents and approvals;
non-withdrawal of regulatory approvals; the impact of the Transaction on
shareholders of Hudbay and Copper Mountain and other stakeholders and other
anticipated benefits of the Transaction. 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 include, amongst others,
risks related to failure to receive approval by shareholders of Hudbay and
Copper Mountain, the required court and other consents and approvals to effect
the Transaction, the potential of a third party making a superior proposal to
the Transaction, the possibility that the definitive arrangement agreement could
be terminated under certain circumstances.

Forward-looking information are based on management of the parties' reasonable
assumptions, estimates, expectations, analyses and opinions, which are based on
such management's experience and perception of trends, current conditions and
expected developments, and other factors that management believes are relevant
and reasonable in the circumstances, but which may prove to be incorrect. Such
factors, among other things, include: business integration risks; fluctuations
in general macroeconomic conditions; fluctuations in securities markets;
fluctuations in spot and forward prices of copper or certain other commodities;
change in national and local governments, legislation, taxation, controls,
regulations and political or economic developments; risks and hazards associated
with the business of mineral exploration, development and mining (including
environmental hazards, industrial accidents, unusual or unexpected formations
pressures, cave-ins and flooding); discrepancies between actual and estimated
metallurgical recoveries; inability to obtain adequate insurance to cover risks
and hazards; the presence of laws and regulations that may impose restrictions
on mining; employee relations; relationships with and claims by local
communities and indigenous populations; availability of increasing costs
associated with mining inputs and labour; the speculative nature of mineral
exploration and development (including the risks of obtaining necessary
licenses, permits and approvals from government authorities); and title to
properties.

Hudbay and Copper Mountain undertake no obligation to update forward-looking
information except as required by applicable law. Such forward-looking
information represents management's best judgment based on the information
currently available. No forward-looking statement can be guaranteed and actual
future results may vary materially. Accordingly, readers are advised not to
place undue reliance on forward-looking statements or information.

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