Document:

COST SHARING AGREEMENT

THIS AGREEMENT is dated the 1st day of October, 2004.

BETWEEN:
              MINCO MINING & METALS CORPORATION, located at Suite 1980 - 1055
              West Hastings Street, Vancouver, B.C., V6E 2E9

              ("Minco")

AND:

              MINCO SILVER CORPORATION, located at Suite 1980 - 1055 West
              Hastings Street, Vancouver, B.C., V6E 2E9

              ("Minco Silver")

AND:

              TRANZCOM CHINA SECURITY NETWORKS INC., located at Suite 1980 -
              1055 West Hastings Street, Vancouver, B.C., V6E 2E9

              "Tranzcom") AND:

              AQUASOL ENVIROTECH LTD., located at Suite 1980 - 1055 West
              Hastings Street, Vancouver, B.C., V6E 2E9

              ("Aquasol")

              (hereinafter collectively referred to as the "Sub-Tenants")

WHEREAS:

A.     Minco has entered into an agreement with Guinness Tower Holdings Ltd. and
       Omers Realty Corporation to lease the premises located at Suite 1980,
       1055 West Hastings Street, Vancouver, B.C., V6E 2E9 (the "Premises"); and

B.     Minco wishes to enter into an agreement with the sub-tenenats to share in
       the office expenses for the Premises as more specifically described
       below.

NOW THEREFORE it is hereby agreed as follows:

1.     Minco and the Sub-Tenants agree that the shared expenses will include the
       following:

       a.     Office Rental cost on a percentage basis (the "shared expenses")
              as more particularly described below:

<TABLE>
<CAPTION>
                ---------------------------------------------------------------------------------
                                              Minco   Trancom    Minco     Aquasol     TOTAL
                                                                 Silver
                ---------------------------------------------------------------------------------
<S>                                            <C>      <C>       <C>      <C>         <C>
                Rent                           32%      30%       30%         8%       100%
                ---------------------------------------------------------------------------------
                Parking
                ---------------------------------------------------------------------------------
                        Stall #1               42%      30%       28%                  100%
                                             ----------------------------------------------------
                        Stall #2               60%      --        40%                  100%
                ---------------------------------------------------------------------------------
                Shared Office Expenses         40%      30%       30%                  100%
                ---------------------------------------------------------------------------------
                Annual Charge Back                                         $300.00
                ---------------------------------------------------------------------------------
</TABLE>

<PAGE>

2.     Minco and the Sub-Tenants agree that the Controller of Minco is hereby
       authorized to allocate the shared expenses on the percentage basis as
       more particularly described above in 1(a) of this Agreement.

3.     Minco will invoice on a monthly basis to the Sub-Tenants and the
       Sub-Tenants agree to reimburse Minco accordingly.

4.     Minco will invoice on a monthly basis to the Sub-Tenants for shared
       employee salaries and benefits which will be invoices on actual time
       spent and the Sub-Tenants agree to such expenses.

IN WITNESS WHEREOF the parties hereto have caused these presents to be executed
as and from the day, month and year first above written.

MINCO MINING & METALS CORPORATION                             C/S

----------------------------------------
Authorized Signatory

MINCO SILVER CORPORATION                                      C/S

----------------------------------------
Authorized Signatory

TRANZCOM CHINA SECURITY                                       C/S

----------------------------------------
Authorized Signatory

AQUASOL ENVIROTCH LTD.                                        C/S

----------------------------------------
Authorized Signatory

                                      - 2 -EXHIBIT 4.2

                                ESCROW AGREEMENT

      This Escrow Agreement (the "Agreement") is made by and between City
National Bank, a national banking association, with its principal office located
at 555 South Flower Street, 12th Floor, Los Angeles, California 90071 (the
"Escrow Agent"), and SRKP 3, Inc., a Delaware corporation, with its principal
office located at 1900 Avenue of the Stars, Suite 310, Los Angeles, California
90067 (the "Issuer").

                              W I T N E S S E T H :

      WHEREAS, the Issuer has filed with the Securities and Exchange Commission
(the "Commission"), Washington, D.C., an SB-2 Registration Statement, as amended
(the "Registration Statement"), and related Prospectus, File No. 333-126441, in
connection with an initial public offering of the Issuer's securities,
comprising 700,000 shares of the Issuer's common stock to be sold at a price of
$0.17 per share (the "Securities");

      WHEREAS, the Issuer proposes to offer the Securities to the public on a
"best efforts, all or none" basis as set forth in the Registration Statement;

      WHEREAS, the Issuer proposes to establish an escrow account (the "Escrow
Account"), to which subscription funds which are received by the Escrow Agent in
connection with such public offering are to be credited, and the Escrow Agent is
willing to establish the Escrow Account on the terms and subject to the
conditions hereinafter set forth; and

      WHEREAS, the Escrow Agent will establish an Escrow Account into which the
subscription funds, which are received by the Escrow Agent and credited to the
Escrow Account, are to be deposited.

      NOW, THEREFORE, for and in consideration of the promises and mutual
covenants herein contained, and other valuable consideration, the parties hereto
hereby agree as follows:

1.0   THE REGISTRATION STATEMENT.

      1.1   The Issuer has filed the Registration Statement with the Commission
            and is included herein as Exhibit A to this Agreement, and is made a
            part hereof.

2.0   ESTABLISHMENT OF THE ESCROW ACCOUNT.

      2.1   The Issuer shall initially establish a non-interest bearing Escrow
            Account at the Escrow Agent. The purpose of the Escrow Account is
            for (a) the deposit of all subscription funds (checks or wire
            transfers) which are received by the Issuer from prospective
            purchasers of the Securities and are delivered by the Issuer to the
            Escrow Agent; (b) the holding of amounts of subscription funds which
            are collected through the banking system; and (c) the disbursement
            of collected funds, all as described herein. The Escrow Agent will
            hold all monies and other property in the Escrow Account free from
            any lien, claim or offset, except as set forth herein, and such
            monies and other property shall not become the property of the
            Company, nor subject to the debts thereof, unless the conditions set
            forth in these instructions to disbursement of such monies to the
            Company have been fully satisfied.

                                  Page 1 of 10
<PAGE>

      2.2   On or before the date of the initial deposit in the Escrow Account
            pursuant to this Agreement, the Issuer shall notify the Escrow Agent
            in writing of the effective date (the "Effective Date") of the
            Registration Statement, and the Escrow Agent shall not be required
            to accept any amounts for credit to the Escrow Account or for
            deposit in the Escrow Account prior to its receipt of such
            notification.

      2.3   The offering period (the "Offering Period"), which shall be deemed
            to commence on the Effective Date, shall be for a period of up to
            180 days. The Offering Period shall be less than 180 days if the
            Issuer sells all Securities for a total consideration of $119,000.
            The last day of the Offering Period, which is either 180 days from
            the Effective Date or the date on which the Issuer sells all
            Securities for a total consideration of $119,000, whichever occurs
            first, is also referred to herein as the "Termination Date." Except
            as provided in Section 4.3 hereof, after the Termination Date, the
            Issuer shall not deposit, and the Escrow Agent shall not accept, any
            additional amounts representing payments by prospective purchasers.

      2.4   If the Escrow Account remains open following the Termination Date in
            accordance with Article 4 below, the Fund (as defined in Section 3.5
            below) shall be placed in a money market investment account bearing
            interest at the Escrow Agent's then applicable rate; provided,
            however, that no interest shall accrue until the Escrow Agent has
            received an IRS Form W-9 completed and executed by the Company.

3.0   DEPOSITS TO THE ESCROW ACCOUNT.

      3.1   The Issuer shall promptly deliver to the Escrow Agent all funds
            which it receives from prospective purchasers of the Securities,
            which funds shall be in the form of checks or wire transfers. Upon
            the Escrow Agent's receipt of such funds, they shall be credited to
            the Escrow Account. All checks delivered to the Escrow Agent shall
            be made payable to the "City National Bank/SRKP 3, Inc.'s Escrow
            Account." Any checks payable other than to the Escrow Agent as
            required hereby shall be returned to the prospective purchaser.

      3.2   Promptly after receiving subscription funds as described in Section
            3.1, the Escrow Agent shall deposit the same into the Escrow
            Account. Amounts of funds so deposited are hereinafter referred to
            as "Escrow Amounts." The Escrow Agent shall cause to process all
            Escrow Amounts for collection through the banking system.
            Simultaneously with each deposit to the Escrow Account, the Issuer
            shall inform the Escrow Agent in writing of the name, address and
            social security number of the prospective purchaser, the amount of
            Securities subscribed for by such purchaser, and the aggregate
            dollar amount of such subscription (collectively, the "Subscription
            Information").

                                  Page 2 of 10
<PAGE>

      3.3   The Escrow Agent shall not be required to accept for credit to the
            Escrow Account checks which are not accompanied by the appropriate
            Subscription Information. Wire transfers and cash representing
            payments by prospective purchasers shall not be deemed deposited in
            the Escrow Account until the Escrow Agent has received in writing
            the Subscription Information required with respect to such payments.

      3.4   The Escrow Agent shall not be required to accept in the Escrow
            Account any amounts representing payments by prospective purchasers,
            whether by check, or wire, except during the Escrow Agent's regular
            business hours.

      3.5   Only those Escrow Amounts, which have been deposited in the Escrow
            Account and which have cleared the banking system and have been
            collected by the Escrow Agent, are herein referred to as the "Fund."

      3.6   If the proposed offering is terminated before the Termination Date,
            the Escrow Agent shall refund any portion of the Fund prior to
            disbursement of the Fund in accordance with Article 4 hereof upon
            instructions in from the Issuer.

4.0   DISBURSEMENT FROM THE ESCROW ACCOUNT.

      4.1   Subject to Section 4.3 below, if by the close of regular banking
            hours on the Termination Date the Escrow Agent determines that the
            amount in the Fund is less than $119,000, then the Escrow Agent
            shall promptly refund to each prospective purchaser the amount of
            payment received from such purchaser which is then held in the Fund
            or which thereafter clears the banking system, without interest
            thereon or deduction therefrom, by drawing checks on the Escrow
            Account for the amounts of such payments and mail them to the
            purchasers. In such event, the Escrow Agent shall promptly notify
            the Issuer of its distribution of the Fund. If the Fund is equal to
            $119,000, the Escrow Account shall remain open beyond the
            Termination Date in accordance with Section 4.2 below.

      4.2   If the Escrow Account remains open beyond the Termination Date, the
            Issuer must satisfy the following conditions:

      within five (5) business days after the effective date of the
post-effective amendment, the Issuer shall send by first class mail to each
purchaser of securities held in escrow, a copy of the prospectus contained in
the post-effective amendment and any amendment or supplement thereto;

      each purchaser shall have no fewer than twenty (20) business days and no
more than forty-five (45) business days from the effective date of the
post-effective amendment to notify the Issuer in writing that the purchaser
elects to remain an investor. If the Issuer has not received such written
notification by the forty-fifth (45th) business day following the Effective Date
of the post-effective amendment, funds held in escrow shall be sent by first
class mail or other equally prompt means to the purchasers within five (5)

                                  Page 3 of 10
<PAGE>

business days, and interest held in escrow shall be sent to the Issuer within
two (2) business days; an acquisition described in the post-effective amendment
will be consummated if a sufficient number of purchasers confirm their
investment with the Issuer; and if an acquisition has not been consummated by
the Issuer within eighteen (18) months after the Effective Date of the
Registration Statement, funds held in escrow shall be returned by first class
mail to the purchasers within five (5) business days, and interest held in
escrow shall be sent to the Issuer within two (2) business days, following that
date. It shall be the responsibility of the Issuer to notify the Escrow Agent if
any of the above conditions are not timely satisfied. Additionally, it shall be
the Issuer's responsibility to timely provide instructions to the Escrow Agent
with respect to interest calculations prior to release of funds and interest to
the purchasers in accordance with the terms of this Section 4.2.

      Funds held in the Escrow Account may be released to the Issuer and
Securities may be delivered to the purchasers only at the same time as or after:

      the Escrow Agent has received a signed representation from the Issuer that
the requirements of paragraphs (e)(1) and (e)(2) of Rule 419 have been met; and

      the Escrow Agent has received a signed representation from the Issuer that
the requirements of paragraph (e)(2)(iii) of Rule 419 have been met.

      The Issuer shall be liable for any misrepresentations made to the Escrow
Agent with respect to this Section 4.2 and the Issuer agrees to indemnify the
Escrow Agent for any claims made by purchasers with respect to this Section 4.2
in accordance with Article 5 below; provided, however, the Issuer shall not be
responsible for the Escrow Agent's failure to timely release funds to the
purchasers upon receipt of instructions from the Issuer.

      4.3   If the Escrow Agent has on hand at the close of business on the
            Termination Date any uncollected amounts which when added to the
            Fund would raise the amount in the Fund to the minimum offering
            amount, and result in the Fund representing the sale of the minimum
            offering amount, consisting of the number of business days set forth
            in the Registration Statement, shall be utilized to allow such
            uncollected funds to clear the banking system.

      4.4   Upon disbursement of the Fund pursuant to the terms of this Article
            4, the Escrow Agent shall be relieved of all further obligations and
            released from all liability under this Agreement. It is expressly
            agreed and understood that in no event shall the aggregate amount of
            payments made by the Escrow Agent exceed the amount of the Fund.

5.0   RIGHTS, DUTIES AND RESPONSIBILITIES OF THE ESCROW AGENT; INDEMNIFICATION.

      5.1   The Escrow Agent shall notify the Issuer on a regular basis of the
            escrow amounts which have been deposited in the Escrow Account and
            of the amounts, constituting the Fund, which have cleared the
            banking system and have been collected by the Escrow Agent.

                                  Page 4 of 10
<PAGE>

      5.2   The Escrow Agent shall not be responsible for or be required to
            enforce any of the terms or conditions of the Agreement with respect
            to the Issuer.

      5.3   The Escrow Agent shall not be required to accept from the Issuer any
            subscription information pertaining to prospective purchasers unless
            such Subscription Information is accompanied by checks or wire
            transfers meeting the requirement of Section 3.1, nor shall the
            Escrow Agent be required to keep records of any information with
            respect to payments deposited by the Issuer, except as to the amount
            of such payments; however, the Escrow Agent shall notify the Issuer
            within a reasonable time of any discrepancy between the amount set
            forth in any subscription information and the amount delivered to
            the Escrow Agent therewith. Such amount need not be accepted for
            deposit in the Escrow Agent until such discrepancy has been
            resolved.

      5.4   The Escrow Agent shall be under no duty or responsibility to enforce
            collection of any check delivered to it hereunder. The Escrow Agent,
            within a reasonable time, shall return to the Issuer any check
            received which is dishonored, together with the Subscription
            Information which accompanied such check.

      5.5   The Escrow Agent shall be entitled to rely upon the accuracy, act in
            reliance upon the contents, and assume the genuineness of any
            notice, instruction, certificate, signature, instrument or other
            document which is given to the Escrow Agent by the Issuer pursuant
            to this Agreement without the necessity of the Escrow Agent
            verifying the truth or accuracy thereof. The Escrow Agent shall not
            be obligated to make any inquiry as to the authority, capacity,
            existence or identity of any person purporting to give any such
            notice or instructions or to execute any such certificate,
            instrument or other document.

      5.6   If the Escrow Agent is uncertain as to its duties or rights
            hereunder or shall receive instructions with respect to the Escrow
            Account, the escrow amounts of the Fund which, in its sole
            determination, are in conflict either with other instructions
            received by it or with any provision of this Agreement, it shall be
            entitled to hold the escrow amounts, the Fund or a portion thereof,
            in the Escrow Account pending the resolution of such uncertainty to
            the Escrow Agent's sole satisfaction, by final judgment of a court
            of competent jurisdiction or otherwise; or the Escrow Agent, at its
            sole option, may deposit with the clerk of a court of competent
            jurisdiction in a proceeding to which all parties in interest are
            joined. Upon the deposit by the Escrow Agent of the Fund with the
            clerk of any court, the Escrow Agent shall be relieved of all
            further obligations and released from all liability hereunder.

      5.7   The Escrow Agent shall not be liable for any action taken or omitted
            hereunder, or for the misconduct of any employee, agent or attorney
            appointed by it, except in the case of willful misconduct or gross
            negligence. The Escrow Agent shall be entitled to consult with
            counsel of its own choosing and shall not be liable for any action
            taken, suffered or omitted by it in accordance with the advice of
            such counsel.

                                  Page 5 of 10
<PAGE>

      5.8   The Escrow Agent shall have no responsibility at any time to
            ascertain whether or not any security interest exists in the escrow
            amounts, the Fund or any part thereof or to file any financing
            statement under the Uniform Commercial Code with respect to the Fund
            or any part thereof.

      5.9   The Issuer agrees to indemnify the Escrow Agent and its officers,
            directors, employees, agents, and shareholders (jointly and
            severally, the "Indemnitees") against, and hold them harmless of and
            from, any and all losses, liabilities, costs, damages, and expenses,
            including, but not limited to, reasonable fees and disbursements for
            counsel of its own choosing (collectively, "Liabilities"), that the
            Indemnitees may suffer or incur and which arise out of or relate to
            this Agreement or any transaction to which this Agreement relates,
            unless such Liability is the result of the willful misconduct or
            gross negligence of the Indemnitees.

      5.10  If the indemnification provided for in this Section 5 is applicable
            but is held to be unavailable, the Issuer shall contribute such
            amounts as are just and equitable to pay or to reimburse the
            Indemnitees for the aggregate of any and all Liabilities actually
            incurred by the Indemnitees as a result of or in connection with any
            amount paid in settlement of any action, claim, or proceeding
            arising out of or relating in any way to any actions or omissions of
            the Issuer.

      5.11  The provisions of this Section 5 shall survive any termination of
            this Agreement, whether by disbursement of the Fund, resignation of
            the Escrow Agent, or otherwise.

6.0   INTERPLEADER.

      6.1   In the event conflicting demands are made or notices served upon the
            Escrow Agent with respect to the Escrow Account, the Escrow Agent
            shall have the absolute right at its election to do either or both
            of the following: (a) Withhold and stop all further proceedings in,
            and performance of, this escrow or (b) File a suit in interpleader
            and obtain an order from the court requiring the parties to litigate
            their several claims and rights among themselves. In the event such
            interpleader suit is brought, the Escrow Agent shall be fully
            released from any obligation to perform any further duties imposed
            upon it hereunder, and the Company shall pay the Escrow Agent all
            costs, expenses and reasonable attorney's fees expended or incurred
            by Escrow Holder (or allocable to its in-house counsel), the amount
            thereof to be fixed and a judgment thereof to be rendered by the
            court in such suit.

7.0   AMENDMENT; RESIGNATION.

      7.1   This Agreement may be altered or amended only with the written
            consent of the parties hereto. The Escrow Agent may resign for any
            reason upon fourteen (14) days' written notice to the Issuer. Should
            the Escrow Agent resign as herein provided, it shall not be required
            to accept any deposit, make any disbursement or otherwise dispose of

                                  Page 6 of 10
<PAGE>

            the escrow amounts, but its only duty shall be to hold the escrow
            accounts until they clear the banking system and the Fund for a
            period of not more than five (5) business days following the
            effective date of such resignation, at which time (a) if a successor
            escrow agent shall have been appointed and written notice thereof
            shall have been given to the resigning escrow agent by the Issuer
            and such successor escrow agent, then the resigning escrow agent
            shall pay over to the successor escrow agent the Fund, less any
            portion thereof previously paid out in accordance with this
            Agreement; or (b) if the resigning escrow agent shall not have
            received written notice signed by the Issuer and a successor escrow
            agent, then the resigning escrow agent shall promptly refund the
            amount in the Fund to each prospective purchaser, without interest
            thereon or deduction therefrom, and the resigning escrow agent shall
            promptly notify the Issuer of its liquidation and distribution of
            the Fund; whereupon, in either case, the Escrow Agent shall be
            relieved of all further obligations and released from all liability
            under this Agreement. Without limiting the provisions of Section 9.1
            hereof, the resigning escrow agent shall be entitled to be
            reimbursed by the Issuer for any expenses incurred in connection
            with its resignation, transfer of the Fund to a successor escrow
            agent or distribution of the Fund pursuant to this Section 7.1.

8.0   REPRESENTATIONS AND WARRANTIES.

      8.1   The Issuer represents and warrants to the Escrow Agent that no party
            other than the parties hereto and the prospective purchasers have,
            or shall have, any claim or security interest in the Fund or any
            part thereof.

      8.2   No financing statement under the Uniform Commercial Code is on file
            in any jurisdiction claiming a security interest in or describing
            the Fund or any part thereof.

      8.3   The Subscription Information submitted with each deposit shall, at
            the time of submission and at the time of the disbursement of the
            Fund, be deemed a representation and warranty that such deposit
            represents a bona fide payment by the purchaser described therein
            for the amount of Securities set forth in such Subscription
            Information.

      8.4   All of the information contained in the Registration Statement is,
            as of the date hereof, and will be, at the time of any disbursement
            of the Fund, true and correct.

9.0   FEES AND EXPENSES.

      9.1   The Escrow Agent shall be entitled to an acceptance fee of $2,000
            and an annual administrative fee of $2,000, payable upon the
            execution of this Agreement. In addition, the Issuer agrees to
            reimburse the Escrow Agent for any reasonable fees and expenses
            incurred in connection with this Agreement, which shall be in
            accordance with the fee schedule set forth on Exhibit B hereto.

                                  Page 7 of 10
<PAGE>

10.0  GOVERNING LAW AND ASSIGNMENT.

      10.1  This Agreement shall be construed in accordance with and governed by
            the laws of the State of California shall be binding upon the
            parties hereto and their respective successors and assigns;
            provided, however, that any assignment or transfer by any party of
            its rights under this Agreement or with respect to the Fund shall be
            void as against the Escrow Agent unless (a) written notice thereof
            shall be given to the Escrow Agent; and (b) the Escrow Agent shall
            have consented in writing to such assignment or transfer.

11.0  NOTICES.

      11.1  All notices required to be given in connection with this Agreement
            shall be sent by registered or certified mail, return receipt
            requested, or by hand delivery with receipt acknowledged, or by
            Express Mail service offered by the United States Post Office to the
            parties at the following addresses (or at such other address for a
            party as shall be specified by like notice):

            (a)   if to the Escrow Agent:

                  City National Bank
                  555 South Flower Street, 12th Floor,
                  Los Angeles, California 90071
                  Telephone:  (213) 673-8844
                  Facsimile:  (213) 673-8850
                  Attn:  Sue Behning

            (b)   if to the Issuer:

                  SRKP 3, Inc.
                  1900 Avenue of the Stars, Suite 310,
                  Los Angeles, California 90067
                  Telephone:  (310)  203-2902
                  Facsimile:  (310) 472-0578
                  Attn:  Richard Rappaport

12.0  SEVERABILITY.

      12.1  If any provision of this Agreement or the application thereof to any
            person or circumstance shall be determined to be invalid or
            unenforceable, the remaining provisions of this Agreement or the
            application of such provision to persons of circumstances other than
            those to which it is held invalid or unenforceable shall not be
            affected thereby and shall be valid and enforceable to the fullest
            extent permitted by law.

                                  Page 8 of 10
<PAGE>

13.0  EXECUTION IN SEVERAL COUNTERPARTS; ENTIRE AGREEMENT.

      13.1  This Agreement may be executed in several counterparts or by
            separate instruments, all of such counterparts and instruments shall
            constitute one agreement, binding on all of the parties hereto.

      13.2  This Agreement constitutes the entire agreement between the parties
            hereto with respect to the subject matter hereof and supersedes all
            prior agreements and understandings, written or oral, of the parties
            in connection therewith.

                                  Page 9 of 10
<PAGE>

      IN WITNESS WHEREOF, the undersigned parties have executed this Agreement
upon proper legal authority as of the 24th day of August, 2005.

                                       City National Bank,
                                        a national banking association

                                       By: /s/ Sue Behning
                                         ---------------------------------------
                                         Sue Behning, Vice President
                                         its Trust Officer

                                           SRKP 3, Inc., a Delaware corporation

                                       By:  /s/ Richard Rappaport
                                          --------------------------------------
                                          Richard Rappaport,
                                          its Chief Executive Officer

                                 Page 10 of 10

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