SONTERRA RESOURCES, INC. Warrant To Purchase Common Stock

THE SECURITIES REPRESENTED BY THIS WARRANT HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR APPLICABLE STATE SECURITIES LAWS. THE SECURITIES MAY NOT BE OFFERED FOR SALE, SOLD, TRANSFERRED OR ASSIGNED (I) IN THE ABSENCE OF (A) AN EFFECTIVE REGISTRATION STATEMENT FOR THE SECURITIES UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR APPLICABLE STATE SECURITIES LAWS OR (B) AN OPINION OF COUNSEL, IN A GENERALLY ACCEPTABLE FORM, THAT REGISTRATION IS NOT REQUIRED UNDER SAID ACT OR APPLICABLE STATE SECURITIES LAWS OR (II) UNLESS SOLD PURSUANT TO RULE 144 UNDER SAID ACT. NOTWITHSTANDING THE FOREGOING, THE SECURITIES MAY BE PLEDGED IN CONNECTION WITH A BONA FIDE MARGIN ACCOUNT OR OTHER LOAN OR FINANCING ARRANGEMENT SECURED BY THE SECURITIES. ANY TRANSFEREE OF THIS WARRANT SHOULD CAREFULLY REVIEW THE TERMS OF THIS WARRANT, INCLUDING SECTION 2(e) HEREOF. THE SECURITIES REPRESENTED BY THIS WARRANT MAY BE LESS THAN THE NUMBER SET FORTH ON THE FACE HEREOF PURSUANT TO SECTION 2(e) HEREOF.

Sonterra Resources, Inc. (f/k/a River Capital Group, Inc.), a Delaware corporation (the “ Company ”), hereby certifies that, for Ten United States Dollars ($10.00) and other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, Longview Marquis Master Fund, L.P., a British Virgin Island limited partnership (“ Marquis ”), the registered holder hereof, or its successors or permitted assigns (the “ Holder ”), is entitled, subject to the terms and conditions set forth below, to purchase from the Company, at any time or times on or after the date hereof, but not after 11:59 P.M. New York Time on the Expiration Date (as defined herein) ONE MILLION FIFTY THOUSAND (1,050,000)   fully paid nonassessable shares of Common Stock (as defined in Section 1(b) ) of the Company (the “ Warrant Shares ”) at the Warrant Exercise Price (as defined in Section 1(b) ); provided , however, that in no event shall the Holder be entitled or required to exercise this Warrant for a number of Warrant Shares in excess of that number of Warrant Shares that, upon giving effect to such exercise, would cause the aggregate number of shares of Common Stock beneficially owned by the Holder and its Affiliates to exceed 4.99% of the outstanding shares of the Common Stock following such exercise. For purposes of the foregoing proviso, the aggregate number of shares of Common Stock beneficially owned by the Holder and its Affiliates shall include the number of shares of Common Stock issuable upon exercise of this Warrant with respect to which the determination of such proviso is being made, but shall exclude shares of Common Stock that would be issuable upon (i) exercise of the remaining, unexercised Warrants (as defined in Section 1(b) below) beneficially owned by the Holder and its Affiliates and (ii) exercise, conversion or exchange of the unexercised, unconverted or unexchanged portion of any other securities of the Company beneficially owned by the Holder and its Affiliates subject to a limitation on conversion, exercise or exchange analogous to the limitation contained herein. Except as set forth in the preceding sentence, for purposes of this paragraph, beneficial ownership shall be calculated in accordance with Section 13(d) of the Exchange Act (as defined in Section 1(b)). For purposes of this Warrant, in determining the number of outstanding shares of Common Stock, a Holder may rely on the number of outstanding shares of Common Stock as reflected in (1) the Company’s most recent Periodic Report (as defined in Section 1(b)), (2) a more recent public announcement by the Company or (3) any other written (including e-mail) notice by the Company or its transfer agent setting forth the number of shares of Common Stock outstanding. Upon the written request of the Holder, the Company shall promptly, but in no event later than two Business Days following the receipt of such request, confirm in writing to the Holder the number of shares of Common Stock then outstanding. In any case, the number of outstanding shares of Common Stock shall be determined after giving effect to the conversion, exercise or exchange of securities of the Company, including this Warrant, by the Holder and its Affiliates since the date as of which such number of outstanding shares of Common Stock was reported.  

Section 1.  

(a)   Securities Purchase   Agreement . This Warrant is issued pursuant to Section 1 of that certain Securities Purchase   Agreement, dated as of November 13, 2008, among the Company and Marquis referred to therein (as such agreement may be amended from time to time as provided therein, the “ Securities Purchase Agreement ”). Each capitalized term used, and not otherwise defined, herein shall have the meaning ascribed thereto in the Securities Purchase Agreement.

(b)   Definitions . The following words and terms used in this Warrant shall have the following meanings:

(i)   “ Approved Stock Plan ” means the Company’s 2007 Non-Qualified Stock Option Plan and the 2008 Sonterra Resources, Inc. Equity Compensation Plan, each as in effect as of the date of the Securities Purchase   Agreement, without amendment or modification thereafter.

(ii)   “ Business Day ” means any day other than Saturday, Sunday or other day on which commercial banks in the City of New York are authorized or required by law to remain closed.

(iii)   “ Common Stock ” means (A) the Company’s Common Stock, par value $0.001 per share, and (B) any capital stock into which such Common Stock shall have been changed or any capital stock resulting from a reclassification of such Common Stock.

(iv)   “ Convertible Securities ” means any stock or securities (other than Options) directly or indirectly convertible into or exchangeable or exercisable for Common Stock.

(v)   “ dollar ” or “ $ ” means U.S. dollars.

(vi)   “Exchange Act” means the Securities Exchange Act of 1934, as amended.

(vii)   “ Exempted Issuances ” means (I) shares of Common Stock issued or deemed to be issued by the Company pursuant to, and in accordance with the terms of, any Approved Stock Plan, provided that the Company shall not (A) amend any Option to reduce its exercise price, (B) cancel any Option and re-grant an Option with a lower exercise price than the original exercise price of the cancelled Option, or (C) take any other action (whether in the form of an amendment, cancellation or replacement grant) that has the effect of repricing an Option, except pursuant to a proportional adjustment to the exercise price and number of shares issuable thereunder to reflect a stock split dividend or stock combination with respect to the Common Stock; (II) shares of Common Stock issued or deemed to be issued by the Company upon the conversion, exchange or exercise of any option, obligation or security outstanding on the date prior to the Warrant Date and set forth in Schedule 3(c) to the Securities Purchase   Agreement, provided that the terms of such option, obligation or security are not amended or otherwise modified on or after the date of the Securities Purchase   Agreement, and provided that the conversion price, exchange price, exercise price or other purchase price is not reduced, adjusted or otherwise modified and the number of shares of Common Stock issued or issuable thereunder is not increased (whether by operation of, or in accordance with, the relevant governing documents or otherwise) on or after the date of the Securities Purchase Agreement; or (III) shares of Common Stock issued or deemed to be issued by the Company upon exercise of this Warrant or the warrant pursuant to that certain Securities Exchange Agreement.

(viii)   “ Expiration Date ” means the date that is five years after the Warrant Date (as defined in Section 12 ) or, if such date does not fall on a Business Day, then the next Business Day.

(ix)   “ Options ” means any rights, warrants or options to subscribe for or purchase any Common Stock or Convertible Securities.

(x)   “ Person ” means an individual, a limited liability company, a partnership, a joint venture, a corporation, a trust, an unincorporated organization or a government or any department or agency thereof or any other legal entity.

(xi)   “ Principal Market ” means, with respect to the Common Stock or any other security, the principal securities exchange or trading market for the Common Stock or such other security.

(xii)   “ Securities Act ” means the Securities Act of 1933, as amended, together with the rules and regulations promulgated by the Securities and Exchange Commission thereunder.

(xiii)   “ Trading Day ” means any day on which the Common Stock is traded on its Principal Market; provided that “Trading Day” shall not include any day on which the Common Stock is scheduled to trade, or actually trades, on its Principal Market for less than 4.5 hours.

(xiv)   “ Warrants ” means this Warrant and all warrants issued in exchange, transfer or replacement thereof pursuant to the terms of this Warrant.

(xv)   “ Warrant Exercise Price ” shall be equal to, with respect to any Warrant Share, $0.01,   subject to adjustment as hereinafter provided.

(xvi)   “ Weighted Average Price ” means, for any security as of any date, the dollar volume-weighted average price for such security on its Principal Market during the period beginning at 9:30 a.m. New York City time (or such other time as its Principal Market publicly announces is the official open of trading) and ending at 4:00 p.m. New York City time (or such other time as its Principal Market publicly announces is the official close of trading) as reported by Bloomberg Financial Markets (or any successor thereto) (“ Bloomberg ”) through its “Volume at Price” functions, or if the foregoing does not apply, the dollar volume-weighted average price of such security in the over-the-counter market on the electronic bulletin board for such security during the period beginning at 9:30 a.m. New York City time (or such other time as such over-the-counter market publicly announces is the official open of trading), and ending at 4:00 p.m. New York City time (or such other time as such over-the-counter market publicly announces is the official close of trading) as reported by Bloomberg, or, if no dollar volume-weighted average price is reported for such security by Bloomberg for such hours, the average of the highest closing bid price and the lowest closing ask price of any of the market makers for such security as reported in the “pink sheets” by the National Quotation Bureau, Inc. If the Weighted Average Price cannot be calculated for such security on such date on any of the foregoing bases, the Weighted Average Price of such security on such date shall be the fair market value as mutually determined by the Company and the Holder. If the Company and the Holder are unable to agree upon the fair market value of such security, then such dispute shall be resolved pursuant to Section 2(d) . All such determinations shall be appropriately adjusted for any stock dividend, stock split, stock combination or other similar transaction during any period during which the Weighted Average Price is being determined.

Section 2.   Exercise of Warrant .

(a)   Subject to the terms and conditions hereof, this Warrant may be exercised by the Holder hereof then registered on the books of the Company, in whole or in part, at any time on any Business Day on or after the opening of business on the date hereof and prior to 11:59 P.M. New York City time on the Expiration Date by (i) delivery of a written notice, in the form of the exercise notice attached as Exhibit A hereto (the “ Exercise Notice ”), of such Holder’s election to exercise this Warrant, which notice shall specify the number of Warrant Shares to be purchased and, if such exercise is conditioned upon consummation of any transaction (an “ Exercise Trigger Transaction ”), such condition to exercise, (ii) (A) payment to the Company of an amount equal to the product of the Warrant Exercise Price multiplied by the number of Warrant Shares as to which this Warrant is being exercised (such product, the “ Aggregate Exercise Price ”), by check or wire transfer of funds, or (B) notifying the Company that this Warrant is being exercised pursuant to a Cashless Exercise (as defined in Section 2(e) ), and (iii) if required by Section 2(f) , unless the Holder has previously delivered this Warrant to the Company and it or a new replacement Warrant has not yet been delivered to the Holder, the surrender to a common carrier for overnight delivery to the Company as soon as practicable following such date, of this Warrant (or an indemnification undertaking, in customary form, with respect to this Warrant in the case of its loss, theft or destruction pursuant to Section 10 ); provided , that if such Warrant Shares are to be issued in any name other than that of the Holder, such issuance shall be deemed a transfer and the provisions of Section 7 shall be applicable. In the event of any exercise of the rights represented by this Warrant in compliance with this Section 2(a) , on the second Business Day (the “ Warrant Share Delivery Date ”) following the date of its receipt of the Exercise Notice, the Aggregate Exercise Price (or notice of Cashless Exercise) and, if required by Section 2(f) (unless the Holder has previously delivered this Warrant to the Company and a new or replacement Warrant has not yet been delivered to the Holder), this Warrant (or an indemnification undertaking, in customary form, with respect to this Warrant in the case of its loss, theft or destruction, pursuant to Section 10 ) (the “ Exercise Delivery Documents ”) (or, if the exercise of this Warrant is conditioned upon the consummation of an Exercise Trigger Transaction, on the later of such second Business Day and the date of consummation of such Exercise Trigger Transaction), (A) if the transfer agent for the Common Stock is participating in The Depository Trust Company (“ DTC ”) Fast Automated Securities Transfer Program and the Holder is eligible to receive shares through DTC, the Company shall credit such aggregate number of shares of Common Stock to which the Holder shall be entitled to the Holder’s or its designee’s balance account with DTC through its Deposit Withdrawal Agent Commission system, or (B) if not, the Company shall issue and deliver to the address specified in the Exercise Notice, a certificate, registered in the name of the Holder or its designee, for the number of shares of Common Stock to which the Holder shall be entitled. Upon the latest of (x) the date of delivery of the Exercise Notice, (y) the date of delivery of the Aggregate Exercise Price referred to in clause (ii)(A) above or notification to the Company of a Cashless Exercise referred to in Section 2(e) , and (z) if the exercise of this Warrant is conditioned upon the consummation of an Exercise Trigger Transaction, the date of such consummation, the Holder shall be deemed for all purposes to have become the holder of record of the Warrant Shares with respect to which this Warrant has been exercised (the date thereof being referred to as the “ Deemed Issuance Date ”), irrespective of the date of delivery of this Warrant as required by clause (iii) above or the certificates evidencing such Warrant Shares.

(b)   If this Warrant is submitted for exercise, as may be required by Section 2(f) , and unless the rights represented by this Warrant shall have expired or shall have been fully exercised, the Company shall, as soon as practicable and in no event later than five Business Days after receipt of this Warrant (the “ Warrant Delivery Date ”) and at its own expense, issue a new Warrant identical in all respects to this Warrant, except that it shall represent rights to purchase the number of Warrant Shares purchasable immediately prior to such exercise under this Warrant, less the number of Warrant Shares with respect to which such Warrant is exercised (together with, in the case of a Cashless Exercise, the number of Warrant Shares surrendered in lieu of payment of the Exercise Price).

(c)   No fractional shares of Common Stock are to be issued upon the exercise of this Warrant, but rather the number of shares of Common Stock issued upon exercise of this Warrant shall be rounded up or down to the nearest whole number (with 0.5 rounded up).

(d)   If the Company shall fail for any reason or for no reason (x) to issue and deliver to the Holder within two Business Days of receipt of the Exercise Delivery Documents a certificate for the number of shares of Common Stock to which the Holder is entitled or to credit the Holder’s balance account with DTC for such number of shares of Common Stock to which the Holder is entitled upon the Holder’s exercise of this Warrant or (y) to issue and deliver to the Holder on the Warrant Delivery Date a new Warrant for the number of shares of Common Stock to which the Holder is entitled pursuant to Section 2(b) , if any, then the Company shall, in addition to any other remedies under this Warrant or the Securities Purchase Agreement or otherwise available to the Holder, including any indemnification under Section 8 of the Securities Purchase   Agreement, pay as additional damages in cash to the Holder on each day after such second Business Day that such shares of Common Stock are not issued and delivered to the Holder, in the case of clause (x) above, or such third Business Day that such Warrant is not delivered, in the case of clause (y) above, an amount equal to the sum of (i) 0.5% of the product of (A) the number of shares of Common Stock not issued to the Holder on or prior to the Warrant Share Delivery Date and (B) the Weighted Average Price of the Common Stock on the Warrant Share Delivery Date, in the case of the failure to deliver Common Stock, and (ii) if the Company has failed to deliver a Warrant to the Holder on or prior to the Warrant Delivery Date, 0.5% of the product of (x) the number of shares of Common Stock issuable upon exercise of the Warrant as of the Warrant Delivery Date, and (y) the Weighted Average Price of the Common Stock on the Warrant Delivery Date. Alternatively, at the election of the Holder made in the Holder’s sole discretion, the Company shall pay to the Holder, in lieu of the additional damages referred to in the preceding sentence (but in addition to all other available remedies that the Holder may pursue hereunder and under the Securities Purchase   Agreement (including indemnification pursuant to Section 8 thereof)), 110% of the amount that (A) the Holder’s total purchase price (including brokerage commissions, if any) for shares of Common Stock purchased to make delivery in satisfaction of a sale by such holder of the shares of Com