Capstone Reports Mineral Resource Estimate for Minto East and Resumption of Drilling

Highest Grade Deposit at Minto to Date - Exploration Continues in Support of an Underground Development

VANCOUVER, Canada, June 23, 2010 - Capstone Mining Corp. ("Capstone") (CS:TSX) today announced the results
of National Instrument 43-101 compliant mineral resource estimate for the
Minto East deposit discovered in 2009 at its high grade Minto copper-gold
mine in Yukon, Canada. This is a preliminary mineral resource estimate for
the Minto East deposit, which is still open to the east, and where
exploration drilling has just resumed. Drilling at Minto East will comprise
step-out holes to test the limits of the deposit and infill holes to
increase the classification of the existing mineral resource. Exploration
drilling will also continue to test other exploration targets, including
those generated from the Titan 24 deep IP survey, which is about 60%
complete.

"The discovery of high grade copper-gold mineralization at Minto East
has opened up a whole new arena within our claims that is prospective for
further deposits and we aim to continue our aggressive exploration agenda
in order to sustain the tremendous rate of discovery, exceeding more than
one new deposit per year at Minto for the past five years," said Stephen
Quin, President of Capstone Mining Corp. "Past exploration has focused
largely within 150 metres from surface since the focus was primarily
mineralization amenable to open pit mining," he said. "That focus has now
changed since scoping work on the feasibility of underground mining
operations has identified opportunities to exploit deeper mineralized
horizons, beneath the limits of current and planned open pits." The
discovery at Minto East, aided by a proof of concept Titan-24 deep earth
imaging IP survey in 2009, has prompted Capstone to significantly enlarge
the Titan-24 survey area in 2010 with the aim of identifying and drill
testing any new anomalies in the same year. Recent new chargeability
anomalies near Copper Keel - Airstrip and west of Area 118 suggest
significant new drill targets.

Mineral Resource Estimates

Minto East - Preliminary Estimate

The results of the preliminary, NI43-101 mineral resource estimate for
the Minto East deposit, a new high grade, copper-gold discovery made in
late 2009, are very encouraging. Minto East is the highest grade deposit
discovered within the Minto Mine property to date, and is one of the
continuing focuses for the current exploration drill program. The mineral
resource estimate is tabulated below using a 0.5% copper cut-off grade (COG
) to allow direct comparison purposes with other Minto deposits, and at a 1
.5% COG (similar to that used for underground mining in the Phase V scoping
study discussed in a news release dated June 8, 2010). At the 1.5% COG, the
mineral resource estimate for Minto East exceeds the amount of unclassified
material used in the Phase V scoping study.

         Minto - Mineral Resources by Class for the Minto East Deposit
                          (at a 0.5% copper cut-off)
     -----------------------------------------------------------
     Classification          Tonnes     Copper   Gold    Silver
                           (000's)(x)     (%)    (g/t)    (g/t)
     -----------------------------------------------------------
     Measured (M)                  -         -      -        -
     -----------------------------------------------------------
     Indicated (I)               736      2.35   0.99      6.2
     -----------------------------------------------------------
     Additional Inferred         588      1.73   0.81      5.6
     -----------------------------------------------------------
     -------------------------------------------------------------------------
     Classification         Contained Cu    Contained Gold   Contained Silver
                           (000's lbs)(x)    (000's oz)(x)     (000's oz)(x)
     -------------------------------------------------------------------------
     Measured (M)                      -                -                 -
     -------------------------------------------------------------------------
     Indicated (I)                38,132               23               147
     -------------------------------------------------------------------------
     Additional Inferred          22,426               15               106
     ------------------------------------------------------------------------- 

         Minto - Mineral Resources by Class for the Minto East Deposit
                          (at a 1.5% copper cut-off)
     -----------------------------------------------------------
     Classification          Tonnes     Copper   Gold    Silver
                           (000's)(x)     (%)    (g/t)    (g/t)
     -----------------------------------------------------------
     Measured (M)                  -         -      -        -
     -----------------------------------------------------------
     Indicated (I)               541      2.88   1.16      7.1
     -----------------------------------------------------------
     Additional Inferred         284      2.55   0.95      6.4
     -----------------------------------------------------------
     -------------------------------------------------------------------------
     Classification         Contained Cu    Contained Gold   Contained Silver
                           (000's lbs)(x)    (000's oz)(x)     (000's oz)(x)
     -------------------------------------------------------------------------
     Measured (M)                      -                -                 -
     -------------------------------------------------------------------------
     Indicated (I)                34,349               20               123
     -------------------------------------------------------------------------
     Additional Inferred          15,966                9                58
     -------------------------------------------------------------------------
     (x)Rounded to nearest thousand
     (xx)Totals may not add exactly due to rounding

A significant percentage of the Minto East mineral resource is already
in the indicated category but, in consideration of the high grade nature of
the Minto East mineralization and its potential significance in any
underground mine development at Minto, drilling has resumed with one rig,
in order to infill the inferred portions of the new resource estimate to a
minimum of indicated class as well as continuing to step out to the east. A
second drill will test chargeability targets identified in the current
Titan-24 IP survey. This survey which will cover about 85% of the mine
property, is approximately 60% complete.

Mineral Resource Estimates

The Minto East mineral resource estimate reported herein for Minto
East was estimated by Garth Kirkham P. Geo. of Kirkham Geosystems who is
the Independent Qualified Person under National Instrument 43-101
responsible for the Minto East mineral resource estimate. The Minto East
mineral resource estimation was completed in MineSight(R) using a 3
dimensional block model and a geology model based upon 16 boreholes. The
block model consisted of 10 x 10 x 3 m block sizes using 1.5m composites
and the mineralization was interpreted as 1 domain. Wireframes were created
and geostatistical analysis was completed on both the assay data and the 1.
5m composite data for each of the metals estimated. The resulting
interpretation is a relatively flat lying mineralized zone with good
continuity, an interpretation consistent with the resource models for
adjacent deposits. The block grades were interpolated using independently
derived ID2 parameters. Resource classification methodology takes into
account both continuity of the mineralization and sample density of the
exploration drilling.

SRK Consulting of Vancouver is nearing completion of new NI43-101
mineral resource estimates for two other deposits, Area 2 / 118 and
Ridgetop, the results of which are expected soon and are anticipated to
generate targets for further drill testing.

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.

Titan-24 IP Survey

The 2010 Titan 24 IP survey, which is planned to cover approximately
60 line kilometres, is approximately 60% complete and will cover about 85%
of the mine property when finished. The survey was suspended due to the
recent wildfire but is expected to recommence next week. Preliminary 2D
inversion models have been received for the partial survey and several new
chargeability anomalies have already been identified and will be drill
tested in the coming weeks.

Drill Program

After a short break for freshet and a delay due to the recent wildfire
, drilling has now recommenced with several objectives in mind:

    (1) Increase the borehole density at Minto East sufficient to infill most
        of the current inferred mineral resource to an indicated
        classification or better, which would be sufficient for conversion to
        mineral reserves should economic factors warrant.
    (2) Test the limits of the current Minto East resource for possible
        expansion, where it currently remains open to the east and southeast.
    (3) Test new Titan-24 chargeability anomalies recently identified in
        areas not previously drilled.
    (4) Increase the borehole density in a "connector" region between
        Area 2 and north Copper Keel sufficient to expand and define to a
        minimum of an indicated mineral resource classification, this
        mineralization lying beneath or adjacent to the current limits of the
        proposed Area 2 open pit.

Quality Assurance

The technical information in this news release has been prepared in
accordance with Canadian regulatory requirements set out in National
Instrument 43-101 and reviewed by Stephen P. Quin, P. Geo., President of
Capstone Mining Corp., who has reviewed the content of this press release.
The exploration activities at the Minto project site are carried out under
the supervision of Brad Mercer, P. Geol., V.P. Exploration for Capstone.
The mineral resources discussed in this new release were estimated by the
following:

Garth Kirkham (P. Geo.) of Kirkham Geosystems Ltd. is the Independent
Qualified Persons under National Instrument 43-101 responsible for the
Minto East mineral resource estimate and has reviewed the information in
this release in respect of the Minto East mineral resource estimates.

The analytical method for the copper and silver analyses is aqua regia
digestion of the samples followed by atomic absorption spectroscopy. Gold
is analysed by fire assay fusion with atomic absorption spectroscopy finish
for gold. Analyses are carried out by ALS Chemex in North Vancouver. When
visible gold is noted in drill core samples or regular fire assay values
appear abnormally high, the pulp and screen metallic assay method is used
to determine the total gold content and gold contents of different size
fractions. This is considered industry best practice when dealing with
coarse gold mineralization where a nugget effect is suspected. This
determination is accepted as the most representative value and is used in
the assay database for resource calculations. Blank and standard samples
are used for quality assurance and quality control. Where more than two
check samples assay outside expected ranges, the entire batch is re-assayed
. After the completion of planned drill programs at Minto, random check
assays will be carried out by Acme Analytical of Vancouver.

Forward-Looking Statements

This document may contain "forward-looking statements" within the
meaning of Canadian securities legislation and the United States Private
Securities Litigation Reform Act of 1995. These forward-looking statements
are made as of the date of this document and Capstone Mining Corp. (
hereinafter referred to as the "Company") do not intend, and do not assume
any obligation, to update these forward-looking statements.

Forward-looking statements relate to future events or future
performance and reflect management of the Company's expectations or beliefs
regarding future events and include, but are not limited to, statements
with respect to the estimation of mineral reserves and resources, 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", "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. 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
resources; possible variations in ore reserves, grade or recovery rates;
accidents, labour disputes and other risks of the mining industry; delays
in obtaining governmental approvals or financing or in the completion of
development or construction activities; 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 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.

For further information: about Capstone, please contact: Darren Pylot,
Vice Chairman & CEO, Stephen Quin, President, Or Investor Relations'
Zobeida Slogan at +1-(604)-684-8894 or +1-(866)-684-8894,
zslogan@capstonemining.com

For further information: about Capstone, please contact: Darren Pylot, Vice Chairman & CEO, Stephen Quin, President, Or Investor Relations' Zobeida Slogan at +1-(604)-684-8894 or +1-(866)-684-8894, zslogan at capstonemining.com