UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549



                                  SCHEDULE 13G



                    Under the Securities Exchange Act of 1934

                          (Amendment No. ___________)*


                            METALLINE MINING COMPANY
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                                (Name of Issuer)


                                  Common Stock
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                           (Title of Class Securities)


                                    591257100
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                                 (CUSIP NUMBER)


                                  March 6, 2007
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             (Date of Event Which Requires Filing of This Statement)


Check the  appropriate box to designate the rule pursuant to which this Schedule
is filed:

         |_| Rule 13d-1(b)

         |X| Rule 13d-1(c)

         |_| Rule 13d-1(d)

*The  remainder  of this cover page shall be filled out for  reporting  person's
initial filing on this form with respect to the subject class of securities, and
for any  subsequent  amendment  containing  information  which  would  alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).


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Persons who respond to the collection of information contained in this form are
not required to respond unless the form displays a currently valid OMB control
number.


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CUSIP NO.  591257100
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1. Names of Reporting Persons.
   I.R.S. Identification Nos. of above persons (entities only).

   Duncan Hsia
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2. Check the appropriate Box if a Member of a Group (See Instructions)

   (a)

   (b)
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3. SEC Use Only
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4. Citizenship or Place of Organization U.S.
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Number of         5.       Sole Voting Power 1,807,328
Shares Bene-      --------------------------------------------------------------
ficially by       6.       Shared Voting Power 840,000**
Owned by Each     --------------------------------------------------------------
Reporting         7.       Sole Dispositive Power 1,807,328
Person With:      --------------------------------------------------------------
                  8.       Shared Dispositive Power 840,000**
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**These shares are beneficially owned by Mr. Hsia's spouse.

9. Aggregate Amount Beneficially Owned by Each Reporting Person 2,647,328
--------------------------------------------------------------------------------

10 Check if the Aggregate Amount in Row (9) Excludes Certain Shares
   (See Instructions)
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11 Percent of Class Represented by Amount in Row (9) 6.9%
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12 Type of Reporting Person (See Instructions) IN
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Item 1

   (a) Name of Issuer:                                  Metalline Mining Company

   (b) Address of Issuer's Principal Executive
       Offices:                                         1330 E. Margaret Avenue
                                                        Coeur d'Alene,
                                                        Idaho 83815

Item 2

   (a) Name of Person Filing:                           Duncan Hsia

   (b) Address of Principal Business Office or,
       if none, residence:                              3909 Harvest Knoll
                                                        Drive Richardson,
                                                        TX 75082

   (c) Citizenship:                                     U.S.

   (d) Title of Class of Securities:                    Common Stock

   (e) CUSIP Number:                                    591257100

Item 3. If this statement is filed pursuant to ss.ss.240.13d-1(b) or
240.13d-2(b) or (c), check whether the person filing is a:

      (a) |_| Broker or dealer registered under section 15 of the Act
              (15 U.S.C. 78o).

      (b) |_| Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c).

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      (c) |_| Insurance company as defined in section 3(a)(19) of the Act (15
              U.S.C. 78c).

      (d) |_| Investment company registered under section 8 of the Investment
              Company Act of 1940 (15 U.S.C 80a-8).

      (e) |_| An investment adviser in accordance with ss.240.13d-
              1(b)(1)(ii)(E);

      (f) |_| An employee benefit plan or endowment fund in accordance with
              ss.240.13d-1(b)(1)(ii)(F);

      (g) |_| A parent holding company or control person in accordance with
              ss.240.13d-1(b)(1)(ii)(G);

      (h) |_| A savings associations as defined in Section 3(b) of the Federal
              Deposit Insurance Act (12 U.S.C. 1813);

      (i) |_| A church plan that is excluded from the definition of an
              investment  company  under  section 3(c)(14) of the Investment
              Company Act of 1940 (15 U.S.C. 80a-3);

      (j) |_| Group, in accordance with ss.240.13d-1(b)(1)(ii)(J).

Item 4. Ownership

      Provide the following information regarding the aggregate number and
percentage of the class of securities of the issuer identified in Item 1.

   (a) Amount beneficially owned:                       2,647,328

   (b) Percent of class:                                6.9%

   (c) Number of shares as to which the person has:


      (i) Sole power to vote or to direct the vote      1,807,328

      (ii) Shared power to vote or to direct the vote   840,000**

      (iii) Sole power to dispose or to direct the
            disposition of                              1,807,328

      (iv) Shared power to dispose or to direct the
           disposition of                               840,000**

**These shares are beneficially owned by Mr. Hsia's spouse.

Item 5. Ownership of Five Percent or Less of a Class. Not Applicable

Item 6. Ownership of More than Five Percent on Behalf of Another Person. Not
Applicable

Item 7. Identification and Classification of the Subsidiary Which Acquired the
Security Being Reported on By the Parent Holding Company or Control Person. Not
Applicable

Item 8. Identification and Classification of Members of the Group. Not
Applicable

Item 9. Notice of Dissolution of Group. Not Applicable

Item 10. Certifications

      By signing  below I certify  that, to the best of my knowledge and belief,
      the  securities  referred to above were not  acquired and are not held for
      the purpose of or with the effect of changing or  influencing  the control
      of the issuer of the  securities and were not acquired and are not held in
      connection with or as a participant in any transaction having that purpose
      or effect.

                                   SIGNATURE

      After  reasonable  inquiry and to the best of my knowledge  and belief,  I
certify that the information  set forth in this statement is true,  complete and
correct.

                                           March 16, 2007
                                           ---------------
                                           Date

                                           /s/ Duncan Hsia
                                           ---------------
                                           Signature

                                           ---------------
                                           Name/Title

Attention:  Intentional  misstatements  or omissions of fact constitute  Federal
criminal violations (See 18 U.S.C. 1001).


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