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Rosanne Williams, B.Sc., B.B.A
Manager Corporate Communications
mailto:williams@crigold.com
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Re: Press Releases - Tuesday, May 01, 2007
07-09 - Cornerstone and Thundermin to Acquire 100% Interest in
the Little Deer Copper Deposit, Newfoundland
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Mount Pearl, NL, Canada: Cornerstone Capital Resources Inc.
(TSXV-CGP) (F-GWN) (B-GWN) (OTC-CTNXF) and Thundermin Resources Inc.
("Thundermin") (THR:TSX) (collectively, the "LDJV") have signed a
letter of intent ("LOI") with Weyburn Investments Ltd. ("Weyburn")
which gives the LDJV an option to acquire a 100% interest in the
past-producing Little Deer copper deposit and adjacent property (the
"Weyburn Property") located 10 km north of Springdale in north-central
Newfoundland.
(see Figure 1:
http://www.cornerstoneresources.com/s/Newfoundland.asp?ReportID=183644)

The Weyburn property consists of 78 claims (1950 ha) comprising the
Little Deer and Duck Pond Mineral Licenses (10215M and 10214M), which
cover the past-producing Little Deer copper deposit and potential
southwest extensions near Duck Pond, plus four additional Mineral
Licenses located east of the Little Deer License. In addition to the
Weyburn Property, the LDJV also holds Cornerstone's 232 claim Mineral
License 12196M (5,800 ha) which essentially surrounds the Little Deer
and Duck Pond licenses on three sides and covers a gap that exists
between these two licenses (collectively the "LDJV Property").

The Little Deer copper deposit was discovered in 1952 by Falconbridge
Nickel Mines Limited. Copper ore was mined from the Little Deer deposit
during two campaigns in the 1970's. The first extraction was conducted
by British Newfoundland Exploration Company ("BRINEX") from 1970 to
1972. Access to the deposit was achieved via a 1,144 m long drift on
the 244 m level from the adjacent Whalesback Mine, which lies north of
the Little Deer deposit on Mineral License 12196M. BRINEX ceased mining
operations at Little Deer in 1972 with the closure of the Whalesback
Mine. In 1973, Green Bay Mining Company ("Green Bay") leased the
property and mined the Little Deer deposit via a 329 m decline. Green
Bay ceased mining operations in 1974 due to low copper prices. Reserves
at the cessation of mining were quoted as 210,200 tonnes grading 1.53%
Cu above the 245 m level (Kean, B. F., Evans, D. T. W., and Jenner, G.
A., Report 95-2, Department of Natural Resources, Government of
Newfoundland and Labrador, 1995). These reserves are not NI 43-101
compliant as they are historical in nature and therefore should not be
relied upon. An independent qualified person has not audited or
classified this historical reserve as current reserves.

An historic exploration program was undertaken on the Little Deer
property from 1998 to 2000 by Mutapa Gold Corp. ("Mutapa"). Their work
consisted of geological mapping, surface and borehole geophysical
surveys and 6,815 metres of Diamond drilling. Mutapa's 12 drill holes,
together with other historic BRINEX drill holes, indicate that there is
the potential to outline a significant resource of economic grade
copper mineralization below and along strike from the areas of the
Little Deer deposit that were mined previously. (see Table 1 and Figure
2:
http://www.cornerstoneresources.com/s/Newfoundland.asp?ReportID=183644)

Of particular interest to the LDJV is the potential to outline new
copper resources in the area immediately beneath the old mine workings
extending from approximately 250 m to a minimum of 600 m below surface
and extending from L14000 E to L13400 E, a distance of 600 m.

Table 1: Significant Copper Drill Hole Intersections Little Deer
Property.

Hole No Easting Northing Dip Az From To Interval Cu
(m) (m) (�) (�) (m) (m) (m)* (%)
Mutapa
LD-98-01 13706 4526 -60 325 338.4 340.5 2.1 5.2
LD-98-02 13706 4526 -65 325 405.1 412.4 7.3 3.0
incl. 405.1 407.2 2.1 4.0
incl. 410.8 412.4 1.6 8.0
LD-98-03 13706 4526 -67 325 434.7 447.6 12.9 3.1
LD-98-04 13706 4526 -72 325 542.9 552.5 9.6 4.3
LD-98-05 13646 4533 -65 325 423.3 431.5 8.2 2.3
LD-98-06 13646 4533 -69 325 452.0 468.9 16.9 1.1
incl. 452.0 458.0 6.0 1.5
incl. 465.0 468.9 3.9 2.2
LD-98-07 13596 4541 -70 325 563.0 568.8 5.8 2.9
LD-98-08 13790 4523 -70 325 533.4 572.1 38.7 1.6
incl. 533.4 541.7 8.3 2.5
incl. 549.7 572.1 22.4 1.6
LD-99-09 13786 4518 -72 346 438.6 443.1 4.5 1.8
LD-99-10* 13747 4500 -74 330 382.2 387.2 5.0 1.5
LD-00-11* 13496 4515 -52 325 382.5 383.0 0.5 1.7
387.5 387.8 0.3 1.5
LD-00-12 13396 4500 -65 325 622.0 623.8 1.8 3.5
643.3 654.0 10.7 3.8
BRINEX
LD-66-132* 13605 4525 -62 360 337.1 340.8 3.7 1.2
LD-66-135 13715 4525 -62 355 320.5 328.5 8.0 3.5
LD-66-136 13380 4545 -62 325 348.0 354.2 6.2 1.9
LD-67-143 13650 4535 -65 334 359.9 361.4 1.5 5.8

Notes:
*Hole LD-99-10 steepened in dip and swung to the east and was stopped
short of the main mineralized horizon.
*Hole LD-00-11 intersected the mineralized horizon above the area of
the higher grade copper values.
*Hole LD-66-132 is at the same approximate elevation as hole LD-00-11
and intersected only the very top part of the main copper
mineralization.
Copper is the predominate economic mineral at Little Deer. However,
values from 1.0 to 4.0% Zn, 1.0 to 2.0 g/t Au and up to 0.1% cobalt
over a few metres have been recorded in the drilling. The total
significance of these elements is unknown at the present time.
*All widths recorded above are core lengths

This area is defined by thirteen drill holes with significant copper
intersections and remains open to the east, west and at depth. (see
Table 1 and Figure 2:
http://www.cornerstoneresources.com/s/Newfoundland.asp?ReportID=183644
). Four of these holes, LD-98-08, LD-98-04, LD-98-07 and LD-00-12, each
intersected significant copper mineralization over mineable widths over
a distance of approximately 450 m on the 550 m elevation. Hole
LD-00-12, which intersected 3.8% Cu over a core length of 10.7 m, is
the farthest west hole drilled to date, except for a few shallow holes
drilled by BRINEX in 1966 near Duck Pond on L12850 E and hole
LD-67-145. Hole LD-00-12 is approximately 250m west of the nearest
hole, LD-98-07, which contains 2.9% Cu over 5.8m and 250 m below hole
LD-67-137 that intersected 0.3 m of massive sulphides which was not
assayed.

Previous surface and borehole geophysical surveys demonstrate a good
correlation between conductivity and copper mineralization. Of
significance is the strong surface DEEPEM geophysical conductor that
correlates well with the copper mineralization intersected to date,
extending a distance of 1800m from L14550E to at least L12750E.
Approximately 700 m of this DEEPEM conductor from L13450E, the
approximate intersection of LD-00-12, west to line 12750E remains
untested by drilling. The DEEPEM survey suggests that the top of the
mineralized horizon plunges shallowly to the west and it may continue
even further west onto Mineral License 12196M (see Figure 1). Shallow
historical drilling completed by BRINEX in the area of L12850E (Duck
Pond) intersected 1.1% Zn over 3.0 m. Later assaying of the same core
by Inco in 1988 includes 1.5% Zn and 2.5 g/t Au over 1.4m, and 0.5% Zn
over 9.5 m, including 1.7% Zn and 3.1 g/t Au over 0.8 m. These
intersections may represent a shallow, more zinc-gold rich portion of
the main Little Deer copper-bearing horizon which may occur at depth at
this location.

The Little Deer volcanogenic massive sulphide ("VMS") copper deposit
occurs within the Cambro-Ordovician Lush's Bight Group sequence of
ophiolitic-like rocks consisting mainly of intermediate to mafic pillow
lavas with minor associated tuffs and agglomerates which have been
intruded by gabbroic stocks and dykes. The main sulphide mineralization
consists of disseminated, stringer, and semi-massive to massive pyrite,
pyrrhotite and chalcopyrite with minor sphalerite. The main
copper-bearing horizon dips approximately 75� to the south. There are
eight similar VMS copper deposits in the Lush's Bight Group with
reported resources of which the past-producing Whalesback and
Gullbridge mines are the largest at approximately 4.5 million tonnes
("Mt"). These deposits form a group that belong to what is commonly
referred to as the "Cyprus" type of VMS copper deposit. There are 17
such deposits known in Cyprus with similar characteristics to those
occurring in the Lush's Bight Group with the largest being Mavaravouni
at approximately 25Mt.

Upon completion of the definitive option agreement between the LDJV and
Weyburn (the "Agreement"), the LDJV intends to commence an aggressive
exploration program on the Little Deer property. This work will consist
of Diamond drilling, borehole geophysical and geological mapping
surveys and grid reconstruction. Final details of this program will be
announced upon completion of the Agreement which is anticipated to be
before the end of May.

Under the terms of the LOI with Weyburn, the LDJV has an option to
acquire a 100% interest in the Weyburn Property by making the following
option payments in cash and/or shares of equal value in each of
Thundermin and Cornerstone, at each of Thundermin's and Cornerstone's
respective election: CDN $170,000 upon the execution and delivery of
the Agreement; $115,000 on or before the 2nd anniversary of the
Agreement (the "Second Payment"); $200,000 on or before the 3rd
anniversary of the Agreement (the "Third Payment")(should the LDJV make
the second payment, then the Third Payment becomes a commitment of the
LDJV); and an amount on or before the 4th anniversary of the Agreement
(the "Buyout Amount") depending on the size of the mineral resource
defined on the Weyburn Property (the "Buyout Mineral Resource"). The
Buyout Amount will commence at $1,500,000 for a deposit of < 4,500,000
tonnes ("t") and range up to $5,000,000 for a deposit of 10,000,000 t.
The LDJV will pay to Weyburn an additional $250,000 for each additional
500,000 t of Buyout Mineral Resource in excess of 10,000,000 t. All
tonnes not paid for as at the date the Buyout Amount is determined will
be paid for on the basis of tonnes mined and milled in the future.

The LDJV is committed to spend a minimum of $850,000 on the Weyburn
Property on or before the second anniversary of the Agreement, a
minimum of $500,000 of which shall be spent on or before the first
anniversary of the Agreement. All additional expenditures on the
Weyburn Property above the $850,000 commitment are at the LDJV's sole
option and discretion. Subject to the LDJV making the Second Payment,
the making of any option payments beyond what is due to Weyburn upon
the execution and delivery of the Agreement, including the payment of
the Buyout Amount, is at the LDJV's sole option and discretion.

Once the LDJV has determined that it has sufficient drill data to
outline a potentially economic tonnage of mineralization on the
Property, the LDJV is to retain a qualified independent engineering
firm to undertake a NI 43-101 mineral resource calculation on such
mineralization (the "Mineral Resource Report"). Such Mineral Resource
Report is to subdivide the mineral resources into measured, indicated
and inferred mineral resources and only the sum of the measured and
indicated mineral resources will be deemed to be the Buyout Mineral
Resource for the purposes of determining the Buyout Amount.

The LDJV will be responsible for the payment of a 2% net smelter
returns royalty ("NSR") payable to a third party on the Little Deer
License, 50% of which can be repurchased for $1,000,000, and the
payment of a 3% NSR to third parties on the Duck Pond License. Should
the LDJV place into production an orebody discovered on Mineral
Licenses 11043M, 11184M, 11187M or 11237M, the LDJV is to pay a 1.5%
NSR royalty to Weyburn, 50% of which can be repurchased by the LDJV for
$1,000,000.

The LDJV will be a 50/50 joint venture between Thundermin and
Cornerstone with Thundermin as operator. Once the LDJV has acquired
sufficient exploration drill data to prepare a Mineral Resource Report,
Thundermin, at its sole discretion and cost, has the right to carry out
a detailed study to determine the economic viability of putting the
resources that are the subject of the Mineral Resource Report into
commercial production (the "Feasibility Study"). By unilaterally
electing to bear the cost of the Feasibility Study, Thundermin will
earn an additional 15% undivided interest in the LDJV. Thundermin shall
have the further right to increase its undivided interest in the LDJV
by an additional 10% by arranging 100% of the necessary bank financing
required to place the mineral resource that was the subject of the
Feasibility Study into commercial production.

Cornerstone is very pleased to engage with Thundermin on our third
joint venture project in Newfoundland. Previously, Cornerstone and
Thundermin had worked together on the Cape Ray Gold and Green Bay Gold
projects.

Mr. Bruce Mitton, PGeo., Exploration Manager -- Canada, Cornerstone
Resources Inc. is the qualified person for the purposes of NI 43-101
that has prepared the content of this release.

On Behalf of the Board,
Glen H. McKay
President & CEO

Further information is available on the Cornerstone Web site at
www.cornerstoneresources.com; via e-mail at communications@crigold.com;
or toll free at 1-877-277-8377.

The TSX Venture Exchange does not accept responsibility for the
adequacy or accuracy of this release.

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Copyright (c) 2007 CORNERSTONE CAPITAL RESOURCES INC. (CGP) All rights
reserved. For more information visit our website at
http://www.cornerstoneresources.com/ or send
mailto:info@cornerstoneresources.com
Message sent on Tue May 1, 2007 at 5:00:00 AM Pacific Time
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