Update on exploration activities at the Lisbon Valley, Utah and San Javier, Sonora copper projects

    TSX: CCU

    DENVER, CO, Aug. 3 /CNW Telbec/ - Constellation Copper Corporation
(CCU:TSX)("the Company") has been active with drilling and related activities
at both its Lisbon Valley, Utah and San Javier, Sonora copper projects during
2007 and is pleased to provide an update of the results.

    Lisbon Valley, Utah

    The results for 16 additional core drill holes completed during 2006-2007
in the south-eastern part of the Flying Diamond-Stateline deposit are
presented below, updating the last press release on the Flying
Diamond-Stateline deposit dated February 19, 2007. The Flying
Diamond-Stateline deposit is located approximately four miles southeast of the
Company's Lisbon Valley copper mine and process plant. Through the current
drilling the deposit is known to be one contiguous zone of mineralization that
stretches for about 10,000 feet along the east splay of the Lisbon Valley
Fault. Mineralization is hosted in the same Cretaceous-age sandstones that
host the deposits at the Centennial, GTO and Sentinel pits currently being
mined at Lisbon Valley. Drilling has ceased for now in the Flying
Diamond-Stateline area and one core drill has been active in drilling step-out
holes in the area of the Centennial pit. A drill hole location map of the
portion of the Flying Diamond-Stateline deposit showing the location of the
drill holes in this release is available on the Company's website.
    The drill holes reported here test an area about 5,000 feet long adjacent
to the east splay of the Lisbon Valley Fault and are arranged in a series of
eight short drill fences oriented perpendicular to the fault. As anticipated
by the geologic model, the copper grades and mineralized thickness for all of
these holes generally decreases as one moves south away from the fault. The
best hole of this series is hole 07C-STL-12, the last hole drilled in this
area, which intercepted from 250 to 315 feet depth, 65 feet grading an average
of 0.98 percent copper. This drill hole is included within an approximate
3,000 foot long section of the Flying Diamond-Stateline deposit where the
depth to the bottom of the mineralized horizon is approximately 300 feet or
less, which is 200-250 feet shallower than that encountered along the central
and north-western portions of the deposit. Additional drilling is planned for
a 1,200 foot length along this 3,000 foot long zone pending the arrival of an
all terrain type reverse circulation or core drill rig. Once this intervening
area has been tested with a series of drill fences a preliminary resource
estimate will be prepared to determine if any portion of Flying
Diamond-Stateline deposit is amenable to open pit mining. The interpreted
results of the seismic geophysical surveys completed earlier in 2007 have
recently been received and are being evaluated to identify targets for
follow-up drilling. We anticipate getting final approvals from the BLM in the
near future to allow the drilling of defined targets in the Lucky Strike-Three
Step Hill area about three miles south of the Lisbon Valley operations.

    A tabulation of the drill hole results is shown below. All mineralized
intercepts are interpreted to represent true thickness as the mineralization
is flat-lying and all holes are vertical.

                        TD      From        To   Thickness         %
    Drill Hole        (ft.)     (ft.)     (ft.)       (ft.)    TotCu

    06C-FLD-22         605       485     524.2        39.2      0.55
                                 550       565          15      0.12
    06C-FLD-24         615       455       540          85      0.20
    06C-STL-01         344       245       295          50      0.28
    06C-STL-02         380       255       290          35      0.27
    07C-STL-01         430       365       415          50      0.90
    07C-STL-02         500       340       345           5      0.14
                                 350       385          35      0.22
                                 415       420           5      0.10
    07C-STL-03         344       170       185          15      1.00
                                 240       300          60      0.82
    07C-STL-04         425       325       350          25      0.24
    07C-STL-05         363       265       300          25      0.15
    07C-STL-06         320       235       265          30      0.19
    07C-STL-07         320         0         0           0      0.00
    07C-STL-08         294       200       230          30      0.24
    07C-STL-09         284       160       220          60      0.47
    07C-STL-10         290       170       230          60      0.47
    07C-STL-11       274.5       185       215          30      0.35
    07C-STL-12         375       140       150          10      0.43
                                 250       315          65      0.98

    All of the sample preparation and assays for the Lisbon Valley drill holes
in this report have been performed by Skyline Labs, Tucson, Arizona. An assay
QA/QC program is routinely followed and calls for the regular insertion of
independent standards, blanks and duplicate samples. The results of the QA/QC
program have been satisfactory. The drilling and assaying program are being
performed under the supervision of Gary Parkison, Vice President Exploration &
Development for Constellation Copper Corporation, a Certified Professional
Geologist and a Qualified Person under National Instrument 43-101.

    San Javier, Sonora, Mexico

    Core drilling continues at the San Javier project since the last press
release dated April 26, 2007. Assay results are presented below for 26 holes
most of which were drilled to define the boundaries of the Cerro Verde deposit
along the east, south and west perimeter. Several drill holes in this series
failed to intersect significant mineralization and hence are not included in
the table below. Mineralization in other holes was thinner and lower grade
than the average for prior holes drilled in the main part of the Cerro Verde
deposit area. It now appears that the zone of contiguous mineralization of
interest at the Cerro Verde deposit has been defined in all areas except for
the northeast where the deposit trends towards the Mesa Grande area. A current
drill hole location map for the Cerro Verde area of the San Javier project is
available on the Company's website. Owing to various orientations of the drill
holes, some intercepts may represent less than true thickness.
    Starting with drill hole SJ-07-57 the Company initiated an in-fill
drilling program at the Cerro Verde deposit with holes spaced at a nominal
50 meter spacing which should be adequate to estimate a mineral resource
expected to contain mainly measured and indicated resource classifications.
Since these holes will be internal to drill holes for which results have
already released, the Company does not intend to release the results of these
in-fill holes.

    Drill Hole          TD      From        To   Thickness         %
                        (m)       (m)       (m)         (m)    TotCu

    SJ-07-23         157.9        30        87          57      0.17
                                 105       129          24      0.17
    SJ-07-24         157.9         0        15          15      0.23
    SJ-07-25         115.8         0        12          12      0.22
                                  81       105          24      0.32
    SJ-07-26         158.5         0        24          24      0.29
                                  48        72          24      0.44
    SJ-07-27          75.6         0        36          36      0.28
                                  60        72          12      0.28
    SJ-07-28          78.6         0      78.6        78.6      0.25
    SJ-07-29         106.7         0        21          21      0.16
                                  51        81          30      0.17
    SJ-07-30         106.7         0        54          54      0.21
                                  66        90          24      0.19
    SJ-07-31          76.2         0        51          51      0.19
    SJ-07-32          67.1         0        36          36      0.22
    SJ-07-35         103.6        24        33           9      0.24
    SJ-07-36          85.3        24        42          18      0.44
    SJ-07-37         137.2         0        69          69      0.24
                                 117       132          15      0.17
    SJ-07-39         139.6         0        39          39      0.16
    SJ-07-40         131.1         0        27          27      0.38
                                  78        99          21      0.65
    SJ-07-41         151.5         0        15          15      0.19
    SJ-07-44         123.0         0        99          99      0.17
    SJ-07-45         119.0         0        84          84      0.20
    SJ-07-46         149.4         0        96          96      0.19
    SJ-07-47         128.0         0        87          87      0.19
    SJ-07-48         137.2         0       105         105      0.28
    SJ-07-49         137.2         0        87          87      0.19
    SJ-07-50         134.1         0        33          33      0.25
    SJ-07-51          97.0         0        36          36      0.17
                                  54        66          12      0.18
    SJ-07-52          79.8         6        48          42      0.17
    SJ-07-53         152.4         0        18          18      0.16

    Drilling, sampling, and assaying are being performed under the
supervision of Gary Parkison, Vice President Exploration & Development for
Constellation Copper Corporation, a Certified Professional Geologist and a
Qualified Person under National Instrument 43-101 and who is also responsible
for the preparation of this release. Sample preparation and assaying are being
performed by International Plasma Labs Ltd. at their facilities in Hermosillo,
Sonora, 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. The
results of the QA/QC program have been satisfactory.
    The Company is currently waiting on the arrival of a track mounted
reverse circulation type drill rig to continue the in-fill drill program at
the Cerro Verde deposit. This drill rig is expected to arrive within the next
week. In addition, a specialized core drill, expected to arrive at site within
a month, will be used to finish off the definition and in-fill drilling of the
Cerro Verde deposit in areas of particularly difficult topography. This
specialized drill will have the capability of drilling both vertically
inclined and horizontal holes in addition to declined holes. Starting with
drill hole SJ-07-75 the core drill currently active on the property was moved
to the La Trinidad area to the north of Cerro Verde, where it is currently
drilling on hole SJ-07-77. Results of the drilling in the La Trinidad and
other areas will be released on a periodic basis as the assays become
    Metallurgical testing on six surface bulk samples continues at the
facilities of Metcon Research in Tucson, Arizona. Results obtained to date in
a series of 8 inch diameter column leach tests are encouraging with good
copper extractions and low acid consumptions at crush sizes of 2 inches,
1 inch and 1/2 inch. Several engineering firms have been contacted regarding
the preparation of a preliminary economic assessment, which is now expected to
be completed in the fourth quarter of 2007. This assessment will incorporate
an updated resource estimate in addition to the results of metallurgical
testing and site specific engineering studies and address the potential to
develop the project as an open pit heap leach copper operation with recovery
of Grade A cathode copper via solvent extraction and electrowinning.


    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: Pat James,
Chairman & CEO; Michelle Hebert, Manager, Corporate Affairs, (720) 228-0055,
Toll Free: 1-877-370-5400, Fax: (303) 863-1736, info@constellationcopper.com,
www.constellationcopper.com; Renmark Financial Communications Inc.: Neil
Murray-Lyon, nmurraylyon@renmarkfinancial.com; Barbara Komorowski,
bkomorowski@renmarkfinancial.com; Media: Vanessa Napoli,
vnapoli@renmarkfinancial.com, (514) 939-3989, Fax: (514) 939-3717,

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