Thundermin Resources Inc.

Thundermin Resources Inc.

October 30, 2007 16:35 ET

Thundermin and Cornerstone Intersect 1.24% Copper and 0.02% Cobalt Over 25.5 m, Including 2.5% Copper and 0.03% Cobalt Over 5.5 m, at a Vertical Depth of 625 m on the Little Deer Copper Deposit

TORONTO, ONTARIO--(Marketwire - Oct. 30, 2007) - Thundermin Resources Inc. ("Thundermin") (TSX:THR) and 50% joint venture partner Cornerstone Resources Inc. ("Cornerstone") (TSX VENTURE:CGP) announce that they have intersected 1.24% Cu and 0.02% Co over 25.5 m , including 2.5% Cu and 0.03% Co over 5.5 m, at a vertical depth of approximately 625 m on the Little Deer copper deposit (see Table 1). This intersection is very significant in that it is approximately 110 m deeper than any historical intersection within the deposit and demonstrates that there is potential to outline a significant resource of economic grade copper-cobalt mineralization in the Little Deer deposit below and along strike from areas that were mined in the early 1970's.

Table 1: Little Deer Assay Results

Hole No Easting Nor- Dip Az From To Inte- Cu Ag Co
(m) thing (degrees) (degrees) (m) (m) rval (%) (g/t) (%)
(m) (m)
LD-07-01 13486 4513 -68.0 325.0 561.3 561.4 0.1 8.90 7.87 0.03
566.1 566.7 0.6 3.20 3.20 0.06
LD-07-02 13634 4536 -74.6 344.2 644.5 670.0 25.5 1.24 1.25 0.02
(incl) 644.5 650.0 5.5 2.50 3.34 0.03
and 644.5 648.5 4.0 2.82 3.80 0.03
and 664.0 670.0 6.0 1.75 1.17 0.01
LD-07-03 13634 4536 -76.9 330.8
LD-07-04 13634 4536 -73.4 336.5
LD-07-05 13751 4507 -67.6 328.6
LD-07-06 13751 4507 -71.3 328.0

LD-07-03 was lost short of the target at 768 m due to drilling problems.
LD-07-04 was stopped short of the target at 422 m as the hole was deviating
too close to the intersection already obtained in LD-07-02.
LD-07-05 was completed at 578 m and assays are pending.
LD-07-06 is currently drilling at 200 m with target depth estimated at
600 m.

Copper is the predominant economic mineral at Little Deer. However, values
from 1.0% to 4.0% zinc, 1.0 to 2.0 g/t gold 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.

An $850,000 diamond drilling program consisting of approximately 5,300 m of drilling in 8-9 holes is currently on-going on the Little Deer copper deposit which is located approximately 10 km north of Springdale in north-central Newfoundland. The purpose of this drill program is to confirm and increase the copper resources outlined by wide-spaced historical holes both at depth and along strike within the deposit.

To date, 3,098 m of drilling in five holes has been completed. LD-07-01 was collared to intersect the Little Deer mineralized horizon at the 550 m elevation approximately midway between historical holes LD-00-12 and LD-98-07 (see Figure 2 accompanying News Release dated May 1, 2007). These holes are approximately 235 m apart and assayed 3.8% Cu over 10.7 m and 2.9% Cu over 5.8 m, respectively. Hole LD-00-12 is the deepest westerly hole drilled on the property to date. Hole LD-07-01 intersected two, narrow, high grade copper-cobalt intervals that assayed 8.90% Cu and 0.03% Co over 0.1 m and 3.20% Cu and 0.06% Co over 0.6 m. These intervals are interpreted to be the upper edge of the copper mineralization in this area of the deposit. Additional drilling will be required to further define the extent of the copper mineralization intersected in holes LD-00-12 and LD-98-07.

Hole LD-07-02 intersected a 50.4 m zone of variably deformed and heavily chloritized intermediate volcanics that contain variable amounts of pyrite-pyrrhotite-chalcopyrite stringer mineralization. A 25.5 m interval within this zone contains 1.24% Cu and 0.02% Co, including a 5.5 m interval of semi-massive pyrrhotite-chalcopyrite-pyrite mineralization from 644.5 to 650.0 that assays 2.5% Cu and 0.03% Co and a 6.0 m interval of stringer sulphide mineralization from 664.0 to 670.0 that assays 1.75% Cu and 0.01% Co. The intersection in hole LD-07-02 is very significant in that it occurs approximately 110 m below historical hole LD-98-04 that assayed 4.3% Cu over 9.6 m and demonstrates that the Little Deer copper deposit in this area remains open to depth below 625 m.

Hole LD-07-03 was collared to intersect the mineralized horizon at the 550 m elevation approximately 75 m west and slightly deeper than historical hole LD-98-04 which assayed 4.3% Cu over 9.6 m. Hole LD-07-03 stayed extremely straight and was lost at 768 m before reaching the target depth due to drilling problems. This hole has been lined with PVC pipe to accommodate a future borehole Pulse EM geophysical survey. If the geophysical survey indicates that the copper bearing horizon extends to this depth, consideration will be given to the use of directional drilling techniques in order to hit the desired target.

Hole LD-07-04 was collared to intersect the mineralized horizon approximately 50 m below historical hole LD-98-06 which contained 1.1% Cu over 16.9 m, including 2.2% Cu over 3.9 m. This hole was abandoned at 422 m due to excessive deviation. Directional drilling techniques may also be used in this hole in the future in order to intersect the intended target.

Hole LD-07-05 was collared to intersect the mineralized horizon at the 460 m elevation between historical holes LD-98-03 and LD-98-08 which are approximately 150 m apart and assayed 3.1% Cu over 12.9 m and 1.6% Cu over 38.7 m, including 2.5% Cu over 8.3 m, respectively. This hole intersected a 73.0 m interval of variably deformed and chloritized intermediate volcanics from 456.0 to 529.0 m containing variable amounts of disseminated and stringer pyrite-pyrrhotite-chalcopyrite mineralization similar in character to that intersected in LD-07-02. A zone of massive to semi-massive pyrrhotite-chalcopyrite-pyrite was intersected from 516.4 to 519.3 m. Assays for the mineralized intervals will be reported when they are received.

Hole LD-07-06 was collared to intersect the mineralized horizon approximately 100 m below hole LD-07-05 on the 575 m elevation and between, and approximately 75 m east of, historical hole LD-98-04 and current hole LD-07-02. This hole is currently at 200 m with a target depth of approximately 600 m.

The Little Deer volcanogenic massive sulphide ("VMS") copper deposit occurs within the Cambro-Ordovician Lush's Bight Group 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 75degrees to the south. There are eight similar VMS copper deposits ("Cyprus type") in the Lush's Bight Group with reported resources of which the Whalesback and Gullbridge deposits are the largest at approximately 4.5 million tonnes ("Mt") each. The Whalesback, which lies approximately 1,150 m north of the Little Deer copper deposit, was mined by British Newfoundland Exploration Company down to the 335 m elevation from 1965 to 1972. 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 25 Mt.

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 planning and 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.

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