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Capstone Mining to Purchase Pinto Valley Copper Mine

             Capstone Mining to Purchase Pinto Valley Copper Mine

  PR Newswire

  VANCOUVER, British Columbia, April 29, 2013

VANCOUVER, British Columbia, April 29, 2013 /PRNewswire/ --

Capstone Mining Corp. ("Capstone") (TSX: CS) today announced that it has
entered into a definitive agreement with BHP Copper Inc., a subsidiary of BHP
Billiton Ltd. ("BHP Billiton"), to purchase BHP Billiton's wholly-owned Pinto
Valley copper mining operation and the associated San Manuel Arizona Railroad
Company ("SMARRCO") in Arizona, USA for US$650 million.

The Pinto Valley Mine is located in the Globe-Miami mining district in
Arizona, approximately 125 kilometres east of Phoenix. It is projected to
produce 130 - 150 million pounds of copper in concentrate and approximately 10
million pounds of copper cathode annually, along with by-product molybdenum
and silver, at an estimated cash cost of approximately $1.80 per pound, net of
by-product credits, for the first five years of production.

"Pinto Valley represents a unique opportunity to acquire a mid-sized producing
copper mine in a well-established and low-risk mining jurisdiction with a
significant mineral resource," said Darren Pylot, President and CEO of
Capstone. "This acquisition gives Capstone our third producing mine with a
long mine life and is consistent with Capstone's strategy of building an
intermediate copper producer focused in the Americas."

"The purchase price and financing structure allows us to maintain our
financial flexibility, retaining approximately $135 million in cash,"
continued Mr. Pylot. "The retained cash, combined with the immediate cash flow
and low on-going capital requirements expected from Pinto Valley and our
current operations, provides us with the necessary financial resources to
continue to fund our development projects."

"During our extensive due diligence process we were very impressed with the
world-class operations and the solid workforce and management team that are in
place at Pinto Valley. We are looking forward to the Pinto Valley employees
joining Capstone as we jointly prepare to realize the full value of the Pinto
Valley asset well into the future," concluded Mr. Pylot.

Investment Highlights

  *Immediately transforms Capstone into an intermediate copper producer.
  *Annual production from Pinto Valley of 130 - 150 million pounds of copper
    provides immediate >160% increase in Capstone's copper production.
  *First five year estimated cash cost of $1.80 per pound (net of by-product
    credits).
  *Further asset diversification into Arizona, USA, one of the world's most
    favorable mining jurisdictions and aligned with Capstone's existing
    assets.
  *Work underway aimed at upgrading the 1 billion tonne Measured and
    Indicated ("M&I") Mineral Resource to extend operations beyond the current
    reserve life reported by BHP Billiton.
  *Maintained and managed to BHP Billiton's world-class standards.
  *All necessary established infrastructure, permits and skilled workforce in
    place.

Transaction Overview

The purchase price is being paid in cash and is subject to customary
adjustments. The purchase price will be satisfied from Capstone's existing
$200 million Senior Secured Revolving Credit Facility ($176 million available)
and from a new 2.5-year, $200 million Senior Secured Reducing Revolving Credit
Facility, that are respectively committed and underwritten by The Bank of Nova
Scotia, and cash on hand. The new facility will include customary covenants
and closing conditions, including closing of the Pinto Valley acquisition, and
will bear interest at market rates. The acquisition agreement is not
conditional upon financing.

Under the terms of the agreement, Capstone is committed to maintaining Pinto
Valley's existing environmental standards and will provide financial
assurances reasonably necessary to obtainregulatory approvals for the
transfer of the applicable permits. BHP Billiton employees working at Pinto
Valley and SMARRCO will become employees of Capstone as part of the
transaction.

The purchase agreement includes typical closing conditions, including
regulatory approvals. Closing of the transaction is expected to occur in the
third quarter of 2013. There can be no assurances the acquisition or the
financing will close.

Operational Highlights

The Pinto Valley Mine successfully restarted operations on schedule in
December 2012 at a capital cost of $194 million (including approximately $60
million for a new mining fleet), which will be fully funded by BHP Billiton.
The restart is progressing well, and is on schedule to achieve a run-rate of
over 50,000 tonnes per day by the end of 2013.

The mine is projected to employ approximately 650 employees and has all
necessary established infrastructure. Key contracts will be in place at
closing of the transaction for water, power and access to markets, and a
Transitional Services Agreement will be executed with BHP Billiton to provide
various administrative services through a defined transition period.

Local regulatory and community support has been demonstrated for the mine
during both prior operations and the recent re-start. Arizona is among the
world's most favorable mining jurisdictions with respect to tax, regulation
and labour.

Mineral Resources

The Pinto Valley property includes a significant amount of mineralization not
included in BHP Billiton's publicly-reported Mineral Reserve estimate.
Capstone has completed the following NI 43-101 compliant Mineral Resource
estimate for the global identified resource, with a technical report to be
filed within 45 days.

Mineral Resource Estimate, February 28, 2013, at a 0.25% COG*

                  Metric                   Contained  Contained
                  Tonnes Copper Molybdenum   Copper   Molybdenum
                   (M)    (%)      (%)     (k tonnes)  (M lbs)
    Measured (M)   402    0.38    0.010      1,544        40
    Indicated (I)  566    0.33    0.008      1,870        45
    Total M&I      968    0.35    0.009      3,414        85
    Inferred        45    0.33    0.009       146         4

* Totals may not sum exactly due to rounding. This estimate had not been
adjusted for the three months of mining from start up to February 28, 2013.

Mineral resources that are not mineral reserves do not have demonstrated
economic viability. Mineral resource estimates do not account for mineability,
selectivity, mining loss and dilution. These mineral resource estimates
include inferred mineral resources that are normally considered too
speculative geologically to have economic considerations applied to them that
would enable them to be categorized as mineral reserves. There is also no
certainty that these inferred mineral resources will be converted to measured
and indicated categories through further drilling, or into mineral reserves,
once economic considerations are applied.

The current Pinto Valley plan of operation, based on BHP Billiton's publicly
reported reserves, projects a 5-year operation, which is fully permitted with
mining presently underway. Capstone believes that considerable potential
exists to upgrade the M&I Mineral Resources into reserves, potentially
extending the operation meaningfully beyond the current reserve life as
reported by BHP Billiton. A Preliminary Feasibility Study ("PFS") is underway
that will target the M&I Mineral Resources for potential conversion to
reserves, with expected completion in 2013. The PFS will consider the
potential to extend operations within the currently permitted boundaries. In
addition, Capstone intends to immediately commission the necessary engineering
and economic studies to consider all remaining current mineral resources in
preparation for filing the permit applications.

Mineral Resource Estimate Methodology

The mineral resource estimate reported herein was prepared by Kirkham
Geosystems Ltd. of Burnaby, BC, Canada. The estimate was completed using
commercial mine planning software MineSight® v7.50 using a three dimensional
block model (100 ft by 100 ft by 45 ft (vertical) block size). The
mineralization was interpreted into distinct domains, modelled as wireframes
and used as hard boundaries to constrain estimation. Geostatistical analysis
was completed on the 45 ft composite assay data for each of the metals, and
variograms were defined for each domain of mineralization. The grades for
copper and molybdenum were interpolated into the block model using the
ordinary kriging method. Interpolated results are reported in measured,
indicated and inferred categories and are based on continuity of the
mineralization and sample density. The model was estimated in imperial units
and converted to metric units where appropriate for disclosure purposes.

The mineral resources are confined within an optimized Lerchs-Grossman (LG)
pit shell to ensure reasonable prospects of economic extraction. The pit shell
was generated using a copper price of $3.30/lb, applied to copper equivalent
grade, with mining costs (ore and waste) of $1.50/ton, processing costs of
$5.00/ton and an overall pit slope of 45°. Copper equivalence (CuEq), used to
constrain the pit, was calculated using a ratio of Cu:Mo of 1:3.3, and
recoveries of 88% and 50%, respectively. Mr. Kirkham is author of a Technical
Report on the Mineral Resource Estimate for the Pinto Valley resource
estimate, to be filed within 45 days of this news release. Mr. Kirkham is
independent of Capstone and is an "Independent Qualified Person" as defined by
NI 43-101. Mr. Kirkham has reviewed and validated the resource information
contained in this release.

Advisors

Scotia Capital Inc. is acting as financial advisor to Capstone and its Board
of Directors. Capstone's legal counsel is Blake, Cassels & Graydon LLP and
Davis, Graham & Stubbs LLP.

Pinto Valley Conference Call and Webcast

Capstone will hold a conference call and webcast on Monday April 29, 2013 at
11:00 am Eastern time (8:00 am Pacific time) for investors and analysts, and
at 1:00 pm Eastern time (10:00 am Pacific time) for media.

Investors and Analysts

    Date:        Monday, April 29, 2013
    Time:        11:00 am Eastern Time -- 8:00 am Pacific Time
    Dial in:     North America: 1-888-390-0546, International: 1-416-764-8688
    Slides:      http://capstonemining.com/s/Presentation.asp (the webcast includes the
                 presentation slides)
    Webcast:    http://event.on24.com/r.htm?e=615451&s=1&k=0CA36935ACBB5C42EFD7343A12A3A4B6
    Replay:      North America: 1-888-390-0541, International: 1-416-764-8677
    Replay Code: 500122

Media

    Date:        Monday, April 29, 2013
    Time:        1:00 pm Eastern Time -- 10:00 am Pacific Time
    Dial in:     North America: 1-888-390-0605, International: 1-416-764-8609
    Slides:      http://capstonemining.com/s/Presentation.asp (the webcast includes the
    Slides:      presentation slides)
    Webcast:    http://event.on24.com/r.htm?e=615488&s=1&k=393BB64A7DEE379C2D11F3629A87D85E
    Replay:      North America: 1-888-390-0541, International: 1-416-764-8677
    Replay Code: 291320

The conference call replays will be available until May 13, 2013. The investor
conference call audio and transcript will be available on Capstone's website
within approximately 24 hours of the call at
http://capstonemining.com/s/Conference_Calls.asp .

Change to Capstone's Q1 Financial Results Timing and Conference Call

Capstone will move the release of its first quarter financial results to
Tuesday, May 7, 2013 after market close, from May 8 as originally scheduled.
The conference call will also move by one day to Wednesday, May 8. The Q1
conference call for investors and analysts will be held at 11:30 am Eastern
time (8:30 am Pacific time) on Wednesday, May 8, 2013. Please note the revised
date below.

    Date:        Wednesday, May 8, 2013
    Time:        11:30 am Eastern Time -- 8:30 am Pacific Time
    Dial in:     North America: 1-888-390-0605, International: 1-416-764-8609
    Webcast:    http://www.newswire.ca/en/webcast/detail/1134543/1237395
    Replay:      North America: 1-888-390-0541, International: 1-416-764-8677
    Replay Code: 378784

The conference call replay will be available until May 23, 2013. The
conference call audio and transcript will be available on Capstone's website
within approximately 24 hours of the call at
http://capstonemining.com/s/Conference_Calls.asp .

About Capstone Mining Corp.

Capstone Mining Corp. is a Canadian base metals mining company, committed to
the responsible development of our assets and the environments in which we
operate. We are preferentially focused on copper, with two producing copper
mines, the Cozamin copper-silver-zinc-lead mine located in Zacatecas State,
Mexico and the Minto copper-gold-silver mine in Yukon, Canada. In addition,
Capstone has two development projects, the large scale 70% owned Santo Domingo
copper-iron-gold project in Chile in partnership with Korea Resources
Corporation and the 100% owned Kutcho copper-zinc-gold-silver project in
British Columbia, as well as exploration at properties in Canada, Chile,
Mexico and Australia. Using our cash flow and strong balance sheet as a
springboard, Capstone aims to grow with continued mineral resource and reserve
expansions, exploration, and through acquisitions in politically stable,
mining-friendly regions. Our headquarters are in Vancouver, Canada and we are
listed on the TSX. Further information is available at
http://www.capstonemining.com .

Cautionary Note Regarding Forward-Looking Information

This document may contain "forward-looking information" within the meaning of
Canadian securities legislation and "forward-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 Capstone Mining Corp. (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 Company management's expectations or beliefs regarding future events
and include, but are not limited to, statements with respect to the estimation
of mineral reserves and mineral resources, the conversion of mineral resources
to mineral reserves, the anticipated date of closing of the acquisition of
Pinto Valley and the associated financing, the realization of mineral reserve
estimates, the timing and amount of estimated future production, costs of
production, capital expenditures, success of mining operations, environmental
risks, unanticipated reclamation expenses, title disputes or claims and
limitations on insurance coverage. In certain cases, forward-looking
statements can be identified by the use of words such as "plans", "expects" or
"does not expect", "is expected", "outlook", "budget", "scheduled",
"estimates", "forecasts", "intends", "anticipates" or "does not anticipate",
or "believes", or variations of such words and phrases or statements that
certain actions, events or results "may", "could", "would", "might" or "will
be taken", "occur" or "be achieved" or the negative of these terms or
comparable terminology. In this document certain forward-looking statements
are identified by words including "scheduled", "guidance", "plan", "planned",
"estimated", "projections", "projected" and "expected". By their very nature
forward-looking statements involve known and unknown risks, uncertainties and
other factors which may cause the actual results, performance or achievements
of the Company to be materially different from any future results, performance
or achievements expressed or implied by the forward-looking statements. Such
factors include, among others, risks related to actual results of current
exploration activities; changes in project parameters as plans continue to be
refined; future prices of mineral resources; possible variations in ore
reserves, grade or recovery rates; accidents; dependence on key personnel;
labour pool constraints; labour disputes; availability of infrastructure
required for the development of mining projects; delays in obtaining
governmental approvals or financing or in the completion of development or
construction activities; and other risks of the mining industry as well as
those factors detailed from time to time in the Company's interim and annual
financial statements and management's discussion and analysis of those
statements, all of which are filed and available for review on SEDAR at
http://www.sedar.com . Although the Company has attempted to identify
important factors that could cause actual actions, events or results to differ
materially from those described in forward-looking statements, there may be
other factors that cause actions, events or results not to be as anticipated,
estimated or intended. There can be no assurance that forward-looking
statements will prove to be accurate, as actual results and future events
could differ materially from those anticipated in such statements.
Accordingly, readers should not place undue reliance on forward looking
statements.

Quality Assurance and NI 43-101 Compliance

The technical information in this news release has been prepared in accordance
with Canadian regulatory requirements set out in National Instrument 43-101
Standards of Disclosure for Mineral Projects of the Canadian Securities
Administrators ("NI 43-101") and reviewed by John Wright, P. Eng., Capstone's
Business Development Manager, a "Qualified Person" under NI 43-101. The
mineral resource estimate reported herein for the Pinto Valley property was
prepared by Garth Kirkham, P. Geo, Kirkham Geosystems Ltd., an independent
Qualified Person, from information provided by BHP Billiton. BHP Billiton's
mineral reserve estimate has been publicly reported in the BHP Billiton 2012
Annual Report.

In addition, Gregg Bush, Senior Vice President and Chief Operating Officer for
Capstone Mining Corp. reviewed and approved this news release.

Technical Report

A NI 43-101 compliant Technical Report related to the mineral resources
reported herein, will be filed under Capstone's profile on SEDAR at
http://www.sedar.com within 45 days.

Alternative Performance Measure

"Cash Cost per Pound of Copper" is an Alternative Performance Measure. This
performance measure is included because this statistic is a key performance
measure that management uses to monitor performance. Management uses this
statistic to assess how the Company is performing to plan and to assess the
overall effectiveness and efficiency of mining operations. This performance
measure does not have a meaning within IFRS and, therefore, amounts presented
may not be comparable to similar data presented by other mining companies.
This performance measure should not be considered in isolation as a substitute
for measures of performance in accordance with IFRS.

Cautionary Note to United States Investors

This news release contains disclosure that has been prepared in accordance
with the requirements of Canadian securities laws, which differ from the
requirements of U.S. securities laws. Without limiting the foregoing, this
news release uses the terms "indicated" and "inferred" resources. U.S.
investors are cautioned that, while such terms are recognized and required by
Canadian securities laws, the SEC does not recognize them. Under U.S.
standards, mineralization may not be classified as a "reserve" unless the
determination has been made that the mineralization could be economically and
legally produced or extracted at the time the reserve determination is made.
U.S. investors are cautioned not to assume that all or any part of indicated
resources will ever be converted into reserves. U.S. investors should also
understand that "inferred resources" have a great amount of uncertainty as to
their existence and as to whether they can be mined legally or economically.
It cannot be assumed that all or any part of "inferred resources" will ever be
upgraded to a higher category. Therefore, U.S. investors are also cautioned
not to assume that all or any part of inferred resources exist, or that they
can be mined legally or economically. Accordingly, information concerning
descriptions of mineralization and resources contained in this news release
may not be comparable to information made public by U.S. companies subject to
the reporting and disclosure requirements of the SEC.

Note: All amounts in US$.

For further information:

Cindy Burnett, VP, Investor Relations and Communications +1-604-637-8157
cburnett@capstonemining.com

(CS.)