Drilling expands San Javier copper project



    TSX: CCU

    DENVER, CO, April 26 /CNW Telbec/ - Constellation Copper Corporation
(CCU: TSX) is pleased to announce additional assay results from holes drilled
in the Cerro Verde area of the Company's wholly owned San Javier copper
project, located approximately a two hour drive east of the capital city of
Hermosillo, Sonora, Mexico, and immediately adjacent to Mexican Highway 16 and
near the village of San Javier, Sonora.
    A total of 20 holes with significant intercepts containing an average
thickness of 83 meters grading 0.33% copper, are summarized below. Most of
these holes were drilled to define the boundaries of the Cerro Verde deposit
along the southeast, south and southwest perimeter. Several holes in this
series failed to intersect significant mineralization and in other holes the
mineralization was thinner and lower grade than the average for prior holes
drilled in the Cerro Verde deposit area. Generally those holes without
significant mineralization are on the outer edge of the mineral system. Owing
to the various orientations of the drill holes, some intercepts may represent
something less than the true thickness. A drill hole location map for the
Cerro Verde area can be found on the company website on the San Javier project
page.


    
    Hole Number     Total        Mineralized Interval         Grade Cu %
                    Depth(m)  From(m)      To(m) Interval(m)
    ----------------------------------------------------------------------
    SJ-06-52        207.2       15         24           9         0.34
                                57        117          60         0.18
                               147        180          33         0.18
    SJ-06-54        224.9       54        192         138         0.43
    SJ-06-55        163.5       69        135          66         0.18
    SJ-06-57        240.2      102        201          99         0.18
    SJ-07-02        140.2      120        129           9         1.37
    SJ-07-03        186.8       69      186.8       117.8         0.31
    SJ-07-04        136.1       93      136.1        43.1         0.21
    SJ-07-05        260.5      189        198           9         0.44
                               213        237          24         0.22
    SJ-07-10        196.1        9         66          57         0.16
    SJ-07-11        246.3       15         66          51         0.25
    SJ-07-12        173.1       12         66          54         0.21
                                93        156          63         0.23
    SJ-07-13        189.0        0         45          45         0.31
                               105        123          18         0.24
                               141        159          18         0.26
    SJ-07-14        173.1        0         60          60         0.59
                                84        150          66         0.55
    SJ-07-15        173.1       81        173          92         0.47
    SJ-07-16        155.5        0         51          51         0.43
    SJ-07-17        197.5        9        174         165         0.31
    SJ-07-18        252.4       15        120         105         0.24
    SJ-07-20        218.9       27        105          78         0.28
    SJ-07-21        155.5       24         66          42         0.28
    SJ-07-22        176.2       51        111          60         0.38
    ----------------------------------------------------------------------
    Average of 20 Holes                                83 meters  0.33% Cu

    The drill results included in this release suggest that the southern area
of the Cerro Verde deposit appears to be significantly mineralized and is
still open for further expansion. Mineralization in this southern area is
contained in blocks or zones that are constrained by numerous high-angle and
low-angle faults. Only a few of these holes drilled in 2006 (SJ-06-52 through
SJ-06-57) were incorporated into the recently released resource estimate for
the Cerro Verde deposit, which did not include the results for any holes
drilled in 2007. Additional drill holes are planned to fully define the extent
of mineralization in this southern area of the deposit.
    Most of the copper in these latest holes appears to consist of either
oxide or leachable secondary sulfide type mineralization, consistent with the
type of mineralization generally seen elsewhere in the project area. The
mineralization in these latest holes is contained within andesitic volcanic
breccias of the Tarahumara formation which is also consistent with what is
seen elsewhere in the project area. The one core drill active on the property
is currently drilling on hole SJ-07-47 and will continue to test the southwest
and western portions of the Cerro Verde deposit to define the limits of
mineralization in these areas before starting an in-fill drill program with
holes spaced approximately fifty meters apart. Samples have been submitted to
the assay lab up through hole SJ-07-32.
    Drilling, sampling, and assaying are being performed under the supervision
of Mr. Gary A. Parkison, Vice President Exploration & Development for
Constellation Copper Corporation, a Certified Professional Geologist and a
Qualified Person. Sample preparation and assaying are being performed by
International Plasma Labs Ltd. at their facilities in Hermosillo, Mexico and
Richmond, British Columbia, Canada, respectively. Prepared standards and
duplicate samples are inserted on a regular basis into the sample stream prior
to assaying to ensure assay precision and accuracy. Drill hole locations and
orientations are referenced in the table below.
    Some metallurgical testing has been completed and additional bulk samples
have been collected at site and delivered to Metcon Research in Tucson,
Arizona for column leach investigations. Initial project engineering and
related studies, including the results of the metallurgical testing, will be
incorporated into a preliminary economic assessment expected to be completed
in mid-2007. This assessment will address the potential to develop the Cerro
Verde deposit as an open pit heap leach copper project with recovery by
solvent extraction and electrowinning to produce Grade A copper cathodes.
    We are pleased with the assay results from the continued drilling to date
and the potential to develop the San Javier property a large open pit copper
mine. This release was prepared by Gary A. Parkison, a Certified Professional
Geologist and a Qualified Person under National Instrument 43-101.

    ----------------------------------------------------------------------
    Hole          Azimuth    Angle      Total          Datum-NAD 27
    Number                              Depth(m)   -----------------------
                                                    East        North
    ----------------------------------------------------------------------
    SJ-06-52           90      -45     206.96      623291      3160218
    ----------------------------------------------------------------------
    SJ-06-53          180      -45     191.41      623291      3160218
    ----------------------------------------------------------------------
    SJ-06-54            0      -45     224.94      623291      3160218
    ----------------------------------------------------------------------
    SJ-06-55            0      -45     163.50      623285      3160096
    ----------------------------------------------------------------------
    SJ-06-56          180      -45     149.34      623285      3160096
    ----------------------------------------------------------------------
    SJ-06-57          270      -45     240.18      623285      3160096
    ----------------------------------------------------------------------
    SJ-07-01           90      -45     186.56      623285      3160096
    ----------------------------------------------------------------------
    SJ-07-02          N/A      -90     140.21      623285      3160096
    ----------------------------------------------------------------------
    SJ-07-03            0      -45     186.82      623199      3160094
    ----------------------------------------------------------------------
    SJ-07-04          N/A      -90     136.11      623199      3160094
    ----------------------------------------------------------------------
    SJ-07-05          180      -45     260.52      623199      3160094
    ----------------------------------------------------------------------
    SJ-07-06          270      -45      90.83      623199      3160094
    ----------------------------------------------------------------------
    SJ-07-07           90      -45     128.41      623199      3160094
    ----------------------------------------------------------------------
    SJ-07-08          N/A      -90     201.17      623043      3160030
    ----------------------------------------------------------------------
    SJ-07-09            0      -45     231.04      623043      3160030
    ----------------------------------------------------------------------
    SJ-07-10          270      -60     196.07      623043      3160030
    ----------------------------------------------------------------------
    SJ-07-11          180      -45     246.28      623043      3160030
    ----------------------------------------------------------------------
    SJ-07-12           90      -45     173.13      623043      3160030
    ----------------------------------------------------------------------
    SJ-07-13           90      -65     188.98      623399      3160299
    ----------------------------------------------------------------------
    SJ-07-14           45      -45     173.13      623399      3160299
    ----------------------------------------------------------------------
    SJ-07-15           90      -45     173.13      623396      3160695
    ----------------------------------------------------------------------
    SJ-07-16          270      -45     155.45      623396      3160695
    ----------------------------------------------------------------------
    SJ-07-17          180      -45     197.51      623396      3160695
    ----------------------------------------------------------------------
    SJ-07-18            0      -45     252.37      623396      3160695
    ----------------------------------------------------------------------
    SJ-07-19          270      -60      20.00      623383      3160688
    ----------------------------------------------------------------------
    SJ-07-20          180      -45     218.85      623106      3159954
    ----------------------------------------------------------------------
    SJ-07-21          N/A      -90     155.45      623106      3159954
    ----------------------------------------------------------------------
    SJ-07-22           90      -45     176.17      623106      3159954
    ----------------------------------------------------------------------
    

    This press release contains certain forward-looking statements. In
certain cases, forward-looking statements can be identified by the use of
words such as "plans", "expects" 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". 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 changes in commodity and power prices, changes in interest and currency
exchange rates, inaccurate geological and metallurgical assumptions (including
with respect to the size, grade and recoverability of mineral reserves and
resources), unanticipated operational difficulties (including failure of
plant, equipment or processes to operate in accordance with specifications,
cost escalation, unavailability of materials and equipment, delays in the
receipt of government approvals, industrial disturbances or other job action,
and unanticipated events related to health, safety and environmental matters),
political risk, social unrest, and changes in general economic conditions or
conditions in the financial markets. 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 to differ from
those 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.
    %SEDAR: 00002465E




For further information:

For further information: Constellation Copper Corporation: Gregory A.
Hahn, President & CEO; Michelle Hebert, Manager-Corporate Affairs, (720)
228-0055, Toll Free: 1-877-370-5400, info@constellationcopper.com;
www.constellationcopper.com; Renmark Financial Communications Inc.: Neil
Murray-Lyon, nmurraylyon@renmarkfinancial.com; Barbara Komorowski,
bkomorowski@renmarkfinancial.com; Media: Lynda Martineau,
lmartineau@renmarkfinancial.com, (514) 939-3989, Fax: (514) 939-3717;
www.renmarkfinancial.com

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