Thundermin Resources Inc.

Thundermin Resources Inc.

December 11, 2007 08:30 ET

Thundermin and Cornerstone Intersect High Grade Copper Mineralization Assaying 4.5% Cu Over 8.8 M, Including 7.5% Cu Over 3.8 m, at the Little Deer Copper Deposit

TORONTO, ONTARIO--(Marketwire - Dec. 11, 2007) - Thundermin Resources Inc. ("Thundermin") (TSX:THR) and 50% joint venture partner Cornerstone Resources Inc. ("Cornerstone") (TSX VENTURE:CGP) announce that they have intersected high grade copper mineralization assaying 4.5% Cu and 0.03% Co over 8.8 m, including 7.5% Cu and 0.05% Co over 3.8 m in hole LD-07-07 and 2.0% Cu and 0.02% Co over 10.1 m, including 4.2% Cu and 0.03% Co over 2.8 m and 4.2% Cu and 0.04% Co over 1.7 m in hole LD-07-06 in recent drilling on the Little Deer copper deposit (see Table 1 and Longitudinal Section). The Little Deer copper deposit, located approximately 10 km north of Springdale in north-central Newfoundland, remains open to the east, west and at depth.

Table 1: Little Deer Assay Results

Dip Az
Easting Northing (degre-(degre- From To Interval Cu Co
Hole No. (m) (m) es) es) (m) (m) (m) (i) (%) (%)
LD-07-05 13751 4507 -67.5 328.6 479.9 484.1 4.2 1.1 0.01
(incl) 479.9 481.5 1.6 1.8 0.02
LD-07-06 13751 4507 -71.3 328.0 541.2 551.3 10.1 2.0 0.02
(incl) 541.2 544.0 2.8 4.2 0.03
and 549.6 551.3 1.7 4.2 0.04
LD-07-07 13751 4507 -62.7 328.7 408.8 417.6 8.8 4.5 0.03
(incl) 413.8 417.6 3.8 7.5 0.05
Hole currently at 350 with
LD-07-08 13780 4516 -76.5 357.5 target at 650

(i) All intervals recorded above and discussed in this release are core

Hole LD-07-06 intersected the mineralized horizon at a vertical depth of 520 m approximately 70 m below hole LD-07-05 and between historical holes LD-98-04 and LD-98-08, which assayed 4.3% Cu and 0.03% Co over 9.6 m, and 1.6% Cu and 0.02% Co over 38.7 m, including 2.5% Cu and 0.03% Co over 8.3 m, respectively. Hole LD-07-06 is also 120 m above the deepest intersection on the property in LD-07-02 which assayed 2.5% Cu and 0.03% Co over 5.5 m at a vertical depth of 630 m.

Hole LD-07-07 intersected the mineralized horizon 35 m to the east of historical holes LD-98-02 and LD-98-03 which assayed 3.0% Cu and 0.03% Co over 7.3 m and 3.1% Cu and 0.03% Co over 12.9 m, respectively. Hole LD-07-07 intersected strong pyrrhotite-chalcopyrite-pyrite stringer and massive sulphide mineralization within intensely chloritized and moderately deformed intermediate pillow lavas at a vertical depth of 377 m and is the easternmost hole drilled to date within the deposit at this depth.

Hole LD-07-08 has been collared to intersect the mineralized horizon at a vertical depth of approximately 550 m and approximately 100 m east of, and 25 m deeper than, hole LD-07-06 (see Longitudinal Section).

An $850,000 diamond drilling program consisting of approximately 5,300 m of drilling in 9 holes is currently on-going on the Little Deer copper deposit and will continue until about mid-December. Approximately 4,540 m of drilling has been completed to date. The main purpose of this program is to confirm and increase the copper resources outlined by wide-spaced historical holes both at depth and along strike in the deposit (details on holes LD-07-01 to LD-07-05 are contained in news releases issued by Thundermin and Cornerstone dated October 30, 2007. This information can also be found on Thundermin's and Cornerstone's respective websites at and or on SEDAR at

Thundermin and Cornerstone are currently developing a follow-up drill program for the property that would commence in early January 2008 after the holiday break. The details of this program will be released once finalized. This program is expected to include wide-spaced drilling to the west of historical hole LD-00-12, which assayed 3.8% Cu over 10.7 m. No deep holes have been drilled in this area to test a strong surface DEEPEM geophysical conductor which extends 700 m to the west of hole LD-00-12. In addition, Thundermin and Cornerstone intend to re-enter some of the deeper historical and current holes and use them as mother holes employing directional drilling techniques to provide closer spaced intersections for a resource calculation on the property.

Thundermin and Cornerstone have the option, on a 50/50 basis with Thundermin as operator, to earn a 100% interest in the Little Deer copper deposit and adjacent property from Weyburn Investments Ltd. ("Weyburn"). Thundermin, under its joint venture agreement with Cornerstone, has the right to increase its interest in the property to 75% by completing a feasibility study and by arranging 100% of the necessary bank financing required to place the property into commercial production. Details of the terms of the agreement with Weyburn and the results of historical exploration programs undertaken on the Little Deer copper deposit are contained in news releases issued by Thundermin and Cornerstone dated May 1, June 21 and July 9, 2007. This information can also be found on Thundermin's and Cornerstone's respective websites at and

Mr. Andrew Hussey, P.Geo., Project Geologist and Lands Manager, Cornerstone Resources Inc., is the qualified person that is responsible for carrying out the drilling program on the property for the purposes of National Instrument 43-101. Mr. Hussey has reviewed and approved the contents of this release. All 2007 drill holes are NQ in size. Specific gravity, rock quality determinations and photographic logging of significant mineralized intersections are performed systematically prior to assaying. The core is logged and the mineralized sections, where appropriate, are sawn in half at a core logging facility in Springdale. Half of the core is submitted for analyses to Eastern Analytical Limited, an independent and qualified assayer located in Springdale, Newfoundland. The remaining half of the core is kept for future reference. Blanks, duplicates and standards are routinely used as part of the assay procedures.

For further information on Thundermin Resources Inc. visit Thundermin's website at or the SEDAR website at

To view a drilling map for the Little Deer project, please visit the following link:

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