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Thundermin Resources Inc.: Thundermin and Cornerstone Announce a $600,000 Diamond Drilling Program for the Little Deer Copper P

TORONTO, ONTARIO--(Marketwire - Sept. 15, 2009) - Thundermin Resources Inc. ("Thundermin") (TSX:THR) and 50% joint venture partner Cornerstone Resources Inc. ("Cornerstone") (TSX VENTURE:CGP) announce that they have approved a $600,000 diamond drilling program, comprising approximately 4,600 metres of drilling in 7 to 8 holes, for the Little Deer copper property located 10 km north of Springdale in north-central Newfoundland.

The primary purpose of this drill program, which follows 7,156 metres of drilling in 10 holes completed from March to July 2009, will be to expand the mineral resources outlined to date to the west and to shallower depths (see news release dated July 7, 2009). Priority targets include:

- 100 m west of hole LD-08-10A that intersected 2.2% Cu over a core
 length of 16.8 m;
- 150 m above and between holes LD-09-22 and LD-08-13 that intersected
 3.8% Cu over 9.1 m and 1.3% Cu over 8.1 m, respectively; and
- 100 m above hole LD-00-12 that intersected 3.8% Cu over 10.7 m.

In addition, a shallow hole will be drilled below historical holes DP-66-01 and DP-66-02 that intersected 1.3% Zn and 1.3 g/t Au over 2.8 m, including 1.7% Zn and 3.0 g/t Au over 0.8 m, and 0.5% Zn and 0.2 g/t Au over 9.5 m, respectively. The purpose of this hole will be to determine the relationship of this zinc-gold mineralization to the main copper zone. It is anticipated that the drill program will commence in September and be completed in December 2009.

Thundermin and Cornerstone also intend to undertake prospecting programs over two key areas within the large 276 claim, 6,630 hectare Little Deer property. A prospecting program undertaken in 2004 over claims held 100% by Thundermin and Cornerstone led to the discovery of high grade gold in float and outcrop over a 1.5 km long, southwest trending area located 800 m from the southwest end of the Little Deer Copper Deposit. Eleven of fifteen grab samples collected over this area returned gold values ranging from 0.3 to 22.7 g/t Au with the highest five samples assaying 22.7, 21.7, 19.6, 10.9, and 10.4 g/t Au. Additional prospecting, trenching and sampling are planned for this area in order to determine the extent and significance of this gold mineralization and what relationship, if any, it may have to the Little Deer Copper Deposit.

A 227 line km airborne VTEM electromagnetic and magnetic survey was completed in the summer of 2008 over claims under option from Weyburn Investments Ltd. that lie immediately east of the Little Deer and Whalesback copper deposits. The VTEM survey successfully identified five conductive trends within the southern portion of the claims which are considered to be priority targets for base metal and/or gold deposits. An initial program of prospecting and ground verification of these airborne conductors is also planned for this fall.

On July 7, 2009, Thundermin and Cornerstone announced that Micon International Limited ("Micon") of Toronto, Ontario had completed a National Instrument 43-101 ("NI 43-101") compliant mineral resource estimate for the Little Deer Copper Deposit ("Deposit") under the supervision of Mr. Reno Pressacco, M.Sc.(A), P.Geo., Senior Geologist with Micon and an independent Qualified Person ("Q.P.") in accordance with NI 43-101. Micon estimated that the Deposit contains Indicated Resources of 1,087,000 tonnes at an average grade of 2.9% Cu and Inferred Resources of 1,950,000 tonnes at an average grade of 2.3% Cu.

Thundermin, the operator, and Cornerstone have the option, on a 50/50 basis to earn a 100% interest in the Little Deer Copper Deposit and adjacent property from Weyburn. Thundermin, under its joint venture agreement with Cornerstone, has the right to increase its interest in the Little Deer 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 on the Little Deer Copper Deposit and the terms of the agreement with Weyburn can be found in news releases dated May 1, June 21, July 9, October 30, December 11, 2007 and January 24, April 9, May 15, June 6, June 17, July 25, November 26, 2008 and February 25, May 12, June 16, July 7, July 16, August 20 and 27, 2009 and on Thundermin's and Cornerstone's respective websites and on SEDAR.

Mr. Andrew Hussey, P.Geo., Project Geologist and Lands Manager, Cornerstone, is the Q.P. that is responsible for supervising the drilling and exploration programs on the property for the purposes of NI 43-101. Mr. Hussey is also the Q.P. that has reviewed and approved the contents of this release.

Thundermin and Cornerstone would like to acknowledge the financial support received from the Junior Company Exploration Assistance Program of the Province of Newfoundland and Labrador in carrying out a portion of their work on the Little Deer property during 2009.

Forward-Looking Statements

This news release may contain "Forward-Looking Statements" that involve risks and uncertainties, such as statements of Thundermin's plans, objectives, strategies, intentions and expectations. The words "potential," "anticipate," "forecast," "believe," "estimate," "expect," "may," "project," "plan," and similar expressions are intended to be among the statements that identify "Forward-Looking Statements". Although Thundermin believes that its expectations reflected in these "Forward-Looking Statements" are reasonable, such statements may involve unknown risks, uncertainties and other factors disclosed in our regulatory filings that can be viewed on the SEDAR website at [ www.sedar.com ]. For us, uncertainties arise from the behaviour of financial and metals markets and from numerous other matters of national, regional, and global scale, including those of an environmental, climatic, natural, political, economic, business, competitive, or regulatory nature. These uncertainties may cause our actual future results to be materially different than those expressed in our "Forward-Looking Statements". Although Thundermin believes the facts and information contained in this news release to be as correct and current as possible, Thundermin does not warrant or make any representation as to the accuracy, validity or completeness of any facts or information contained herein and these statements should not be relied upon as representing its views subsequent to the date of this news release.

Visit Thundermin's website at [ www.thundermin.com ] or the SEDAR website at [ www.sedar.com ].