Voting And Exchange Trust Agreement

VOTING AND EXCHANGE TRUST AGREEMENT

AGREEMENT made as of March 22, 2007, among US Gold Corporation (" US Gold "), a corporation existing under the laws of Colorado, US Gold Alberta ULC (" Alberta ULC "), an unlimited liability corporation existing under the laws of Alberta, US Gold Canadian Acquisition Corporation (" Canadian Exchange Co. "), a corporation existing under the laws of Alberta, and Computershare Trust Company of Canada, a trust company incorporated under the laws of Canada (hereinafter referred to as " Trustee ").

RECITALS:

WHEREAS US Gold, together with Canadian Exchange Co., has offered, each by way of a public take-over bid, to acquire all of the outstanding common shares of each of White Knight Resources Ltd., Nevada Pacific Gold Ltd. and Tone Resources Ltd. in consideration for exchangeable shares (" Exchangeable Shares ") of Canadian Exchange Co.;

AND WHEREAS holders of Exchangeable Shares will be entitled to require Canadian Exchange Co. to redeem such Exchangeable Shares and upon such redemption each Exchangeable Share shall be exchanged for one share of common stock of US Gold (" US Gold Common Stock ");

AND WHEREAS the parties desire to make appropriate provision and to establish a procedure whereby (i) voting rights in US Gold shall be exercisable by Beneficiaries (as hereinafter defined) from time to time by and through the Trustee, which will hold legal title to the Special Voting Share (as hereinafter defined) to which voting rights attach for the benefit of Beneficiaries, and (ii) the rights to require US Gold or, at the option of US Gold, Alberta ULC, to purchase Exchangeable Shares from the Beneficiaries shall be exercisable by Beneficiaries from time to time of Exchangeable Shares by and through the Trustee, which will hold legal title to such rights for the benefit of the Beneficiaries;

AND WHEREAS these recitals and any statements of fact in this agreement are made by US Gold, Alberta ULC and Canadian Exchange Co. and not by the Trustee;

NOW THEREFORE, in consideration of the respective covenants and agreements provided in this agreement and for other good and valuable consideration (the receipt and sufficiency of which are hereby acknowledged), the parties agree as follows:

ARTICLE 1
DEFINITIONS AND INTERPRETATION

1.1 Definitions

In this agreement, each initially capitalized term and the terms used and not otherwise defined herein shall have the meaning ascribed thereto in the rights, privileges, restrictions and conditions (collectively, the " Share Provisions ") attaching to the Exchangeable Shares as set out in the articles of Canadian Exchange Co. and the following terms shall have the following meanings:

" Automatic Exchange Right " has the meaning ascribed thereto in Section 5.11(2).






" Beneficiaries " mean the registered holders from time to time of Exchangeable Shares, other than US Gold and its Subsidiaries.

" Beneficiary Votes " has the meaning ascribed thereto in Section 4.2.

" Exchange Right " has the meaning ascribed thereto in Section 5.1.

" including " means "including without limitation" and " includes " means "includes without limitation".

" Indemnified Parties " has the meaning ascribed thereto in Section 8.1.

" Insolvency Event " means (i) the institution by Canadian Exchange Co. of any proceeding to be adjudicated a bankrupt or insolvent or to be dissolved or wound up, or the consent of Canadian Exchange Co. to the institution of bankruptcy, insolvency, dissolution or winding-up proceedings against it, or (ii) the filing by Canadian Exchange Co. of a petition, answer or consent seeking dissolution or winding-up under any bankruptcy, insolvency or analogous laws, including, without limitation, the Companies Creditors92 Arrangement Act (Canada) and the Bankruptcy and Insolvency Act (Canada), and the failure by Canadian Exchange Co. within 15 days of becoming aware thereof, or the consent by Canadian Exchange Co. to the filing of any such petition or to the appointment of a receiver, or (iii) the making by Canadian Exchange Co. of a general assignment for the benefit of creditors, or the admission in writing by Canadian Exchange Co. of its inability to pay its debts generally as they become due, or (iv) Canadian Exchange Co. not being permitted, pursuant to solvency requirements of applicable law, to redeem any Retracted Shares pursuant to Section 6.1(4) of the Share Provisions specified in a retraction request delivered to Canadian Exchange Co. in accordance with Article 6 of the Share Provisions.

" List " has the meaning ascribed thereto in Section 4.6.

" Officer92s Certificate " means, with respect to US Gold, Alberta ULC or Canadian Exchange Co., as the case may be, a certificate signed by any one of the Chairman of the Board, the President, any Vice-President or any other senior officer of US Gold, Alberta ULC or Canadian Exchange Co., as the case may be.

" Retracted Shares " has the meaning ascribed thereto in Section 5.7.

" Special Voting Share " means the one share of special voting preference stock with no par value, issued by US Gold to and deposited with the Trustee, which entitles the holder of record to a number of votes at meetings of holders of US Gold Common Stock equal to the number of Exchangeable Shares outstanding from time to time that are held by Beneficiaries.

" Trust " means the trust created by this agreement.

" Trust Estate " means the Special Voting Share, any other securities, the Exchange Right and any money or other rights or assets that may be held by the Trustee from time to time pursuant to this agreement.

" Trustee " means Computershare Trust Company of Canada and, subject to the provisions of Article 9, includes any successor trustee.

" US Gold Consent " has the meaning ascribed thereto in Section 4.2.

" US Gold Liquidation Event " has the meaning ascribed thereto in Section 5.11(1).

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" US Gold Liquidation Event Effective Date " has the meaning ascribed thereto in Section 5.11(3).

" US Gold Meeting " has the meaning ascribed thereto in Section 4.2.

" Voting Rights " means the voting rights attached to the Special Voting Share.

1.2 Interpretation Not Affected by Headings, etc.

The division of this agreement into articles and sections and the insertion of headings are for reference purposes only and shall not affect the interpretation of this agreement. Unless otherwise indicated, any reference in this agreement to an "Article" or "Section" refers to the specified Article or Section of this agreement.

1.3 Number, Gender, etc.

In this agreement, unless the context otherwise requires words importing the singular number include the plural and vice versa. Words importing any gender shall include all genders and words importing persons include individuals, corporations, partnerships, companies, associations, trusts, unincorporated organizations, governmental bodies and other legal or business entities of any kind.

1.4 Date for any Action

If any date on which any action is required to be taken under this agreement is not a Business Day, such action shall be required to be taken on the next succeeding Business Day.

1.5 Payments

All payments to be made hereunder will be made without interest and less any tax required by Canadian law to be deducted and withheld.

ARTICLE 2
TRUST

2.1 Establishment of Trust

The purpose of this agreement is to create the Trust for the benefit of the Beneficiaries, as herein provided. The Trustee will hold the Special Voting Share in order to enable the Trustee to exercise the Voting Rights and will hold the Exchange Right in order to enable the Trustee to exercise such right and will hold the other rights granted in or resulting from the Trustee being a party to this agreement in order to enable the Trustee to exercise or enforce such rights, in each case as trustee for and on behalf of the Beneficiaries as provided in this agreement.

ARTICLE 3
SPECIAL VOTING SHARE

3.1 Issue and Ownership of the Special Voting Share

Simultaneously with the execution and delivery of this agreement, US Gold will issue to and deposit with the Trustee the Special Voting Share to be hereafter held of record by the Trustee as trustee for and on behalf of, and for the use and benefit of, the Beneficiaries and in accordance with the provisions of this agreement. US Gold hereby acknowledges receipt from the Trustee as trustee for and on behalf of the Beneficiaries of good and valuable consideration (and the adequacy thereof) for the issuance

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of the Special Voting Share by US Gold to the Trustee. During the term of the Trust and subject to the terms and conditions of this agreement, the Trustee shall possess and be vested with full legal ownership of the Special Voting Share and shall be entitled to exercise all of the rights and powers of an owner with respect to the Special Voting Share provided that the Trustee shall: (a) hold the Special Voting Share and the legal title thereto as trustee solely for the use and benefit of the Beneficiaries in accordance with the provisions of this agreement; and (b) except as specifically authorized by this agreement, have no power or authority to sell, transfer, vote or otherwise deal in or with the Special Voting Share and the Special Voting Share shall not be used or disposed of by the Trustee for any purpose other than the purposes for which this Trust is created pursuant to this agreement.

3.2 Legended Share Certificates

Canadian Exchange Co. will cause each certificate representing Exchangeable Shares to bear an appropriate legend notifying the Beneficiaries of their right to instruct the Trustee with respect to the exercise of the Voting Rights in respect of the Exchangeable Shares of the Beneficiaries.

3.3 Safe Keeping of Certificate

The certificate representing the Special Voting Share shall at all times be held in safe keeping by the Trustee or its agent.

ARTICLE 4
EXERCISE OF VOTING RIGHTS

4.1 Voting Rights

The Trustee, as the holder of record of the Special Voting Share, shall be entitled to all of the Voting Rights, including the right to consent to or vote in person or by proxy the Special Voting Share, on any matter, question, proposal or proposition whatsoever that may properly come before the stockholders of US Gold at a US Gold Meeting or in connection with a US Gold Consent. The Voting Rights shall be and remain vested in and exercised by the Trustee. Subject to Section 6.15 hereof, the Trustee shall exercise the Voting Rights only on the basis of instructions received pursuant to this Article 4 from Beneficiaries entitled to instruct the Trustee as to the voting thereof at the time at which the US Gold Consent is sought or the US Gold Meeting is held. To the extent that no instructions are received from a Beneficiary with respect to the Voting Rights to which such Beneficiary is entitled, the Trustee shall not exercise or permit the exercise of such Voting Rights.

4.2 Number of Votes

With respect to all meetings of stockholders of US Gold at which holders of shares of US Gold Common Stock are entitled to vote (each, a " US Gold Meeting ") and with respect to all written consents sought from the holders of shares of US Gold Common Stock (a " US Gold Consent "), each Beneficiary shall be entitled to instruct the Trustee to cast and exercise, in the manner instructed, one vote for each Exchangeable Share owned of record by such Beneficiary on the record date established by US Gold or by applicable law for such US Gold Meeting or US Gold Consent, as the case may be (the " Beneficiary Votes "), in respect of each matter, question, proposal or proposition to be voted on at such US Gold Meeting or to be consented to in connection with such US Gold Consent.

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4.3 Mailings to Shareholders

(1) With respect to each US Gold Meeting and US Gold Consent, the Trustee will mail or cause to be mailed (or otherwise communicate in the same manner as US Gold utilizes in communications to holders of US Gold Common Stock, subject to the Trustee being advised in writing of such manner and provided that such manner of communications is reasonably available to the Trustee) to each of the Beneficiaries named in the List at the Beneficiaries92 respective addresses as set forth in the List, on the same day as the initial mailing or notice (or other communication) with respect thereto is given by US Gold to its stockholders:

(a) a copy of such notice, together with any related materials, including any circular or information statement or listing particulars, to be provided to shareholders of US Gold but excluding proxies to vote US Gold Common Stock;

(b) a statement that such Beneficiary is entitled to instruct the Trustee as to the exercise of the Beneficiary Votes with respect to such US Gold Meeting or US Gold Consent, as the case may be, or, pursuant and subject to Section 4.7, to attend such US Gold Meeting and to exercise personally the Beneficiary Votes thereat;

(c) a statement as to the manner in which such instructions may be given to the Trustee, including an express indication that instructions may be given to the Trustee to give:

(i) a proxy to such Beneficiary or his, her or its designee to exercise personally such holder92s Beneficiary Votes; or

(ii) a proxy to a designated agent or other representative of the management of US Gold to exercise such Beneficiary Votes;

(d) a statement that if no such instructions are received from the Beneficiary, the Beneficiary Votes to which such Beneficiary is entitled will not be exercised;

(e) a form of direction whereby the Beneficiary may so direct and instruct the Trustee as contemplated herein; and

(f) a statement of (i) the time and date by which such instructions must be received by the Trustee in order to be binding upon it, which in the case of a US Gold Meeting shall not be later than the close of business on the second Business Day prior to such meeting, and (ii) the method for revoking or amending such instructions.

(2) The materials referred to in this Section 4.3 are to be provided to the Trustee by US Gold, and the materials referred to in Sections 4.3(1)(c), 4.3(1)(e) and 4.3(1)(f) shall (if reasonably practicable to do so) be subject to reasonable comment by the Trustee in a timely manner; provided, however, that the Trustee shall have no obligation to review such materials. Subject to the foregoing, US Gold shall ensure that the materials to be provided to the Trustee are provided in sufficient time to permit the Trustee to comment as aforesaid and to send all materials to each Beneficiary at the same time as such materials are first sent to holders of US Gold Common Stock. US Gold agrees not to

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communicate with holders of US Gold Common Stock with respect to the materials referred to in this Section 4.3 otherwise than by mail unless such method of communication is also reasonably available to the Trustee for communication with the Beneficiaries.

(3) For the purpose of determining Beneficiary Votes to which a Beneficiary is entitled in respect of any US Gold Meeting or US Gold Consent, the number of Exchangeable Shares owned of record by the Beneficiary shall be determined at the close of business on the record date established by US Gold or by applicable law for purposes of determining stockholders entitled to vote at such US Gold Meeting or to give written consent in connection with such US Gold Consent. US Gold will notify the Trustee of any decision of the board of directors of US Gold with respect to the calling of any US Gold Meeting or the seeking of any US Gold Consent and shall provide all necessary information and materials to the Trustee in each case promptly and in any event in sufficient time to enable the Trustee to perform its obligations contemplated by this Section 4.3.

4.4 Copies of Shareholder Information

US Gold will deliver to the Trustee copies of all proxy materials (including notices of US Gold Meetings but excluding proxies to vote US Gold Common Stock), information statements, reports (including all interim and annual financial statements) and other written communications that, in each case, are to be distributed by US Gold from time to time to holders of US Gold Common Stock in sufficient quantities and in sufficient time so as to enable the Trustee to send or cause to be sent those materials to each Beneficiary at the same time as such materials are first sent to holders of US Gold Common Stock. The Trustee will mail or otherwise send, or cause to be mailed or otherwise sent, to each Beneficiary, at the expense of US Gold, copies of all such materials (and all materials specifically directed to the Beneficiaries or to the Trustee for the benefit of the Beneficiaries by US Gold) received by the Trustee from US Gold contemporaneously with the sending of such materials to holders of US Gold Common Stock. The Trustee will also make available for inspection by any Beneficiary at the Trustee92s principal office(s) in Toronto, Ontario or Calgary, Alberta all proxy materials, information statements, reports and other written communications that are:

(a) received by the Trustee as the registered holder of the Special Voting Share and made available by US Gold generally to the holders of US Gold Common Stock; or

(b) specifically directed to the Beneficiaries or to the Trustee for the benefit of the Beneficiaries by US Gold.

4.5 Other Materials

Immediately after receipt by US Gold or stockholders of US Gold of any material sent or given by or on behalf of a third party to holders of US Gold Common Stock generally, including, without limitation, dissident proxy and information circulars (and related information and material) and take-over bid and securities exchange take-over bid circulars (and related information and material), US Gold shall use its reasonable efforts to obtain and deliver to the Trustee copies thereof in sufficient quantities so as to enable the Trustee to forward or cause to be forwarded such material (unless the same has been provided directly to Beneficiaries by such third party) to each Beneficiary as soon as possible thereafter. As soon as reasonably practicable after receipt thereof, the Trustee will mail or otherwise send, or cause to be mailed or otherwise sent, to each Beneficiary, at the expense of US Gold, copies of all such materials received by

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the Trustee from US Gold. The Trustee will also make available for inspection by any Beneficiary at the Trustee92s principal office(s) in Toronto, Ontario or Calgary, Alberta copies of all such materials.

4.6 List of Persons Entitled To Vote

Canadian Exchange Co. shall, (a) prior to each annual, general and special US Gold Meeting or the seeking of any US Gold Consent and (b) forthwith upon each request made at any time by the Trustee in writing, prepare or cause to be prepared a list (a " List ") of the names and addresses of the Beneficiaries arranged in alphabetical order and showing the number of Exchangeable Shares held of record by each such Beneficiary, in each case at the close of business on the date specified by the Trustee in such request or, in the case of a List prepared in connection with a US Gold Meeting or a US Gold Consent, at the close of business on the record date established by US Gold or pursuant to applicable law for determining the holders of US Gold Common Stock entitled to receive notice of and/or to vote at such US Gold Meeting or to give consent in connection with a US Gold Consent. Each such List shall be delivered to the Trustee promptly after receipt by Canadian Exchange Co. of such request or the record date for such meeting or seeking of consent, as the case may be, and, in any event, within sufficient time as to enable the Trustee to perform its obligations under this agreement. US Gold agrees to give Canadian Exchange Co. written notice (with a copy to the Trustee) of the calling of any US Gold Meeting or the seeking of any US Gold Consent, together with the record date therefor, sufficiently prior to the date of the calling of such meeting or seeking such consent so as to enable Canadian Exchange Co. to perform its obligations under this Section 4.6.

4.7 Entitlement To Direct Votes

Any Beneficiary named in a List prepared in connection with any US Gold Meeting or any US Gold Consent will be entitled (a) to instruct the Trustee in the manner described in Section 4.3 hereof with respect to the exercise of the Beneficiary Votes to which such Beneficiary is entitled or (b) to attend such meeting and personally to exercise thereat (or to exercise with respect to any written consent), as the proxy of the Trustee, the Beneficiary Votes to which such Beneficiary is entitled or (c) to appoint a third party as the proxy of the Trustee to attend such meeting and exercise thereat the Beneficiary92s voting rights to which such Beneficiary is entitled except, in each case, to the extent that such Beneficiary has transferred the ownership of any Exchangeable Shares in respect of which such Beneficiary is entitled to Beneficiary Votes after the close of business on the record date for such meeting or seeking of consent.

4.8 Voting By Trustee and Attendance of Trustee Representative at Meeting

(1) In connection with each US Gold Meeting and US Gold Consent, the Trustee shall exercise, either in person or by proxy, in accordance with the instructions received from a Beneficiary pursuant to Section 4.3 hereof, the Beneficiary Votes as to which such Beneficiary is entitled to direct the vote (or any lesser number thereof as may be set forth in the instructions); provided, however, that such written instructions are received by the Trustee from the Beneficiary prior to the time and date fixed by the Trustee for receipt of such instruction in the notice sent or caused to be sent by the Trustee to the Beneficiary pursuant to Section 4.3.

(2) The Trustee shall cause such representatives who are empowered by it to sign and deliver, on behalf of the Trustee, proxies for Voting Rights enabling a Beneficiary to attend each US Gold Meeting. Upon submission by a Beneficiary (or its designee) named in the List prepared in connection with the relevant meeting of identification satisfactory to the Trustee92s representative, and at the Beneficiary92s request, such representative shall sign and deliver to such Beneficiary (or its designee) a proxy to exercise personally the

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Beneficiary Votes as to which such Beneficiary is otherwise entitled hereunder to direct the vote, if such Beneficiary either (i) has not previously given the Trustee instructions pursuant to Section 4.3 in respect of such meeting or (ii) submits to such representative written revocation of any such previous instructions. At such meeting, the Beneficiary (or its designee) exercising such Beneficiary Votes shall have the same rights in respect of such Beneficiary Votes as the Trustee to speak at the meeting in respect of any matter, question, proposal or proposition, to vote by way of ballot at the meeting in respect of any matter, question, proposal or proposition, and to vote at such meeting by way of a show of hands in respect of any matter, question or proposition.

4.9 Distribution of Written Materials

Any written materials distributed by the Trustee to the Beneficiaries pursuant to this agreement shall be sent by mail (or otherwise communicated in the same manner as US Gold utilizes in communications to holders of US Gold Common Stock subject to the Trustee being advised in writing of such manner and provided such manner of communications is reasonably available to the Trustee) to each Beneficiary at its address as shown on the register of holders of Exchangeable Shares maintained by the registrar of the Exchangeable Shares. Canadian Exchange Co. shall provide or cause to be provided to the Trustee for purposes of communication, on a timely basis and without charge or other expense:

(a) a current List; and

(b) upon the request of the Trustee, mailing labels to enable the Trustee to carry out its duties under this agreement.

4.10 Termination of Voting Rights

Except as otherwise provided in the Share Provisions , all of the rights of a Beneficiary with respect to the Beneficiary Votes exercisable in respect of the Exchangeable Shares held by such Beneficiary, including the right to instruct the Trustee as to the voting of or to vote personally such Beneficiary Votes, shall be deemed to be surrendered by the Beneficiary to US Gold or Alberta ULC, as the case may be, and such Beneficiary Votes and the Voting Rights represented thereby shall cease immediately upon the delivery by such holder to the Trustee of the certificates representing such Exchangeable Shares in connection with the exercise by the Beneficiary of the Exchange Right or the occurrence of the automatic exchange of Exchangeable Shares for US Gold Common Stock, as specified in Article 5 hereof, or upon the retraction or redemption of Exchangeable Shares pursuant to Article 6 or Article 7 of the Share Provisions, or upon the effective date of the liquidation, dissolution or winding-up of Canadian Exchange Co. or any other distribution of the assets of Canadian Exchange Co. among its shareholders for the purpose of winding up its affairs pursuant to Article 5 of the Share Provisions, or upon the purchase of Exchangeable Shares from the holder thereof by US Gold or Alberta ULC pursuant to the exercise by US Gold or Alberta ULC of the Retraction Call Right, the Redemption Call Right or the Liquidation Call Right (unless US Gold shall not have delivered the requisite US Gold Common Stock and cheque, if any, delivered in exchange therefor to the Trustee pending delivery to the Beneficiaries).

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ARTICLE 5
EXCHANGE RIGHT, AUTOMATIC EXCHANGE RIGHT AND US GOLD SUPPORT

5.1 Grant and Ownership of the Automatic Exchange Right and the Exchange Right

US Gold, and Alberta ULC, in the case of the Exchange Right, hereby grant to the Trustee as trustee ...