DIA MET MINERALS LTD
SC 13G/A, 2000-04-18
METAL MINING
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                             SECURITIES AND EXCHANGE
                                   COMMISSION
                             Washington, D.C. 20549


                                  SCHEDULE 13G


                    Under the Securities Exchange Act of 1934


                              DIA MET MINERALS LTD.
                                (Name of Issuer)

                                 Amendment No.1

                        Class A Subordinate Voting Shares
                         (Title of Class of Securities)


                                    25243K208
                                 (CUSIP Number)


                                December 31, 1999
             (Date of Event Which Requires Filing of this Statement)


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

     [X] Rule 13d-1(b)
     [ ] Rule 13d-1(c)
     [ ] Rule 13d-1(d)

* The remainder of this cover page shall be filled out for a 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).


<PAGE>

CUSIP No. 25243K208                   13G                     Page 2 of 15 Pages
________________________________________________________________________________
1.   NAME OF REPORTING PERSON
     S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

     RT Capitial Management Inc.
________________________________________________________________________________
2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                 (a)  [_]
                                                                 (b)  [_]
________________________________________________________________________________
3.   SEC USE ONLY


________________________________________________________________________________
4.   CITIZENSHIP OR PLACE OF ORGANIZATION
     The jurisdiction of organization is Canada (federally incorporated company)


________________________________________________________________________________
              5.   SOLE VOTING POWER

                   N/A
NUMBER OF     __________________________________________________________________
SHARES        6.   SHARED VOTING POWER
BENEFICIALLY
OWNED BY EACH      2,846,125**
REPORTING     __________________________________________________________________
PERSON WITH   7.   SOLE DISPOSITIVE POWER

                   N/A
              __________________________________________________________________
              8.   SHARED DISPOSITIVE POWER

                   2,846,125**
________________________________________________________________________________
9.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     2,846,125**
________________________________________________________________________________
10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                          [_]
________________________________________________________________________________
11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

     28.7%***
________________________________________________________________________________
12.  TYPE OF REPORTING PERSON*

     Foreign Investment Adviser which received SEC no-action relief to file on
     Schedule 13G as a "Qualified Institutional Investor"
________________________________________________________________________________

*SEE INSTRUCTIONS BEFORE FILLING OUT!

**   The  number  of  Class A  subordinate  voting  shares  ("Class  A  Shares")
     beneficially  owned includes 1,661,090 Class A Shares and 1,185,035 Class B
     multiple  voting shares  ("Class B Shares").  Shares of each class have the
     right to convert to shares of the other class on a one-for-one  basis.  The
     right is  exercisable  at any time with respect to the Class B Shares,  but
     only in certain circumstances with respect to the Class A Shares.

***  The  1,661,090  Class A Shares and  1,185,035  Class B Shares  beneficially
     owned represent 19.0 percent and 5.4 percent of such classes, respectively.
     For  purposes of  determining  the  percent of Class A Shares  beneficially
     owned pursuant to Rule  13d-3(d)(1)(i)  of the  Securities  Exchange Act of
     1934, as amended (the "Exchange  Act"),  the number of shares  beneficially
     owned  and the  number  of  shares  outstanding  for such  class  have been
     increased by the number of Class B Shares beneficially owned.


<PAGE>


CUSIP No. 25243K208                    13G                    Page 3 of 15 Pages
________________________________________________________________________________
1.   NAME OF REPORTING PERSON
     S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

     RT Investment Management Holdings Inc.
________________________________________________________________________________
2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                 (a)  [_]
                                                                 (b)  [_]
________________________________________________________________________________
3.   SEC USE ONLY


________________________________________________________________________________
4.   CITIZENSHIP OR PLACE OF ORGANIZATION
     The jurisdiction of organization is Canada (federally incorporated company)


________________________________________________________________________________
              5.   SOLE VOTING POWER

                   N/A
NUMBER OF     __________________________________________________________________
SHARES        6.   SHARED VOTING POWER
BENEFICIALLY
OWNED BY EACH      2,994,275**
REPORTING     __________________________________________________________________
PERSON WITH   7.   SOLE DISPOSITIVE POWER

                   N/A
              __________________________________________________________________
              8.   SHARED DISPOSITIVE POWER

                   2,994,275**
________________________________________________________________________________
9.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     2,994,275**
________________________________________________________________________________
10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                          [_]
________________________________________________________________________________
11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

     30.0%***
________________________________________________________________________________
12.  TYPE OF REPORTING PERSON*

     Foreign Parent Holding Company which received SEC no-action relief to file
     on Schedule 13G as a "Qualified Institutional Investor"
________________________________________________________________________________

*SEE INSTRUCTIONS BEFORE FILLING OUT!

**   The number of Class A Shares  benefically owned includes  1,175,940 Class A
     Shares and 1,242,335 Class B Shares. Shares of each class have the right to
     convert to shares of the other class on a one-for-one  basis.  The right is
     exercisable  at any time with  respect  to the Class B Shares,  but only in
     certain circumstances with respect to the Class A Shares.

***  The  1,751,940  Class A Shares and  1,242,335  Class B Shares  beneficially
     owned represent 20.1 percent and 5.7 percent of such classes, respectively.
     For  purposes of  determining  the  percent of Class A Shares  beneficially
     owned  pursuant to Rule  13d-3(d)(1)(i)  of the Exchange Act, the number of
     shares  beneficially  owned and the number of shares  outstanding  for such
     class  have been  increased  by the  number of Class B Shares  beneficially
     owned.


<PAGE>



CUSIP No. 25243K208                    13G                    Page 4 of 16 Pages
________________________________________________________________________________
1.   NAME OF REPORTING PERSON
     S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

     The Royal Trust Company
________________________________________________________________________________
2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                 (a)  [_]
                                                                 (b)  [_]
________________________________________________________________________________
3.   SEC USE ONLY


________________________________________________________________________________
4.   CITIZENSHIP OR PLACE OF ORGANIZATION
     The jurisdiction of organization is Canada (federally incorporated company)


________________________________________________________________________________
              5.   SOLE VOTING POWER

                   N/A
NUMBER OF     __________________________________________________________________
SHARES        6.   SHARED VOTING POWER
BENEFICIALLY
OWNED BY EACH      1,039,100**
REPORTING     __________________________________________________________________
PERSON WITH   7.   SOLE DISPOSITIVE POWER

                   N/A
              __________________________________________________________________
              8.   SHARED DISPOSITIVE POWER

                   1,039,100**
________________________________________________________________________________
9.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     1,039,100**
________________________________________________________________________________
10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                          [_]
________________________________________________________________________________
11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

     11.3%***
________________________________________________________________________________
12.  TYPE OF REPORTING PERSON*

     Foreign  Trust  Company  which  received  SEC  no-action  relief to file on
     Schedule 13G as a "Qualified Institutional Investor"
     ___________________________________________________________________________

     *SEE INSTRUCTIONS BEFORE FILLING OUT!

**   The number of Class A Shares  beneficially  owned includes  609,700 Class A
     Shares and 429,400  Class B Shares.  Shares of each class have the right to
     convert to shares of the other class on a one-for-one  basis.  The right is
     exercisable  at any time with  respect  to the Class B Shares,  but only in
     certain circumstances with respect to the Class A Shares.

***  The 609,700  Class A Shares and 429,400 Class B Shares  beneficially  owned
     represent  7.0 percent and 2.0 percent of such classes,  respectively.  For
     purposes of determining  the percent of Class A Shares  beneficially  owned
     pursuant to Rule  13d-3(d)(1)(i)  of the Exchange Act, the number of shares
     beneficially owned and the number of shares outstanding for such class have
     been increased by the number of Class B Shares beneficially owned.


<PAGE>


Item 1(a) Name of Issuer:

          DIA MET MINERALS LTD.

Item 1(b) Address of Issuer's Principal Executive Offices:

          DIA MET MINERALS LTD.
          1695 Powick Road
          Kelowna, British Columbia
          Canada V1X 4L1

Item 2(a) Name of Person Filing:

          1.  RT Capital Management Inc. ("RTCM")
          2.  RT Investment Management Holdings Inc. ("RTIM")
          3.  The Royal Trust Company ("RT")

Item 2(b) Address of Principal Business Office or, if None,
          Residence:

          1.  RT Capital Management Inc.
              Royal Trust Tower, P.O. Box 121
              77 King Street West, Suite 3800
              Toronto, Ontario  M5K 1H1

          2.  RT Investment Management Holdings Inc.
              Royal Trust Tower, P.O. Box 97
              77 King Street West, Suite 3900
              Toronto, Ontario  M5K 1G8

          3.  The Royal Trust Company
              Royal Trust Tower, P.O. Box 7500, Station A
              77 King Street West, 6th Floor
              Toronto, Ontario M5W 1P9

Item 2(c) Citizenship:
          Canada

Item 2(d) Title of Class of Securities:
          Class A Subordinate Voting Shares

Item 2(e) CUSIP Number:

          25243K208


<PAGE>


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

        1.   RT Capital Management Inc. is a foreign Investment Adviser which
             received  SEC  no-action  relief  to  file on  Schedule  13G as a
             Qualified Institutional Investor.

        2.   RT  Investment  Management  Holdings  Inc.  is a  foreign  Parent
             Holding  Company which  received SEC no-action  relief to file on
             Schedule 13G as a Qualified Institutional Investor.

        3.   The Royal Trust Company is a foreign Trust Company which received
             SEC  no-action  relief  to file on  Schedule  13G as a  Qualified
             Institutional Investor.

Item 4. Ownership.

      (a)  Amount beneficially owned:

           1.  RTCM - 2,846,125

           2.  RTIM - 2,994,275

           3.  RT   - 1,039,100

      (b) Percent of class:

           1.  RTCM - 28.7%

           2.  RTIM - 30.0%

           3.  RT   - 11.3%

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

           (i)   Sole power to vote or to direct the vote N/A

           (ii)  Shared power to vote or to direct the vote

                 1.  RTCM - 2,846,125

                 2.  RTIM - 2,994,275

                 3.  RT   - 1,039,100

           (iii) Sole power to dispose or to direct the disposition of N/A

           (iv)  Shared power to dispose or to direct the disposition of

                 1.  RTCM - 2,846,125

                 2.  RTIM - 2,994,275

                 3.  RT   - 1,039,100

<PAGE>


Item 5. Ownership of Five Percent or Less of a Class.

     If this  statement  is being  filed to report  the fact that as of the date
hereof the reporting  person has ceased to be the beneficial  owner of more than
five percent of the class of securities, check the following [_].

Item 6. Ownership of More than Five Percent on Behalf of Another Person.

1.   RT Capital Management Inc. Accounts managed on a discretionary basis by RT
     Capital Management Inc., a wholly-owned subsidiary of RT Investment
     Management Holdings Inc., are known to have the right to receive or the
     power to direct the receipt of the dividends from, or the proceeds from,
     the sale of such securities. No such account holds more than 5 percent of
     the class.

2.   RT Investment Management Holdings Inc., a foreign parent holding company
     which received SEC no-action relief to file on Schedule 13G as a Qualified
     Institutional Investor, is reporting holdings over which it is deemed to be
     a beneficial owner by virtue of the fact that the holdings belong to client
     accounts managed on a discretionary basis by RT Investment Management
     Holdings Inc.'s subsidiary foregin investment advisers.

3.   The Royal Trust  Company,  a foreign  Trust  Company which has received SEC
     no-action  relief  to file on  Schedule  13G as a  Qualified  Institutional
     Investor,  is reporting holdings over which it is deemed to be a beneficial
     owner by virtue of its status as trustee and/or as principal.

Item 7. Identification and Classification of the Subsidiary Which
        Acquired the Security Being Reported on by the Parent
        Holding Company.

     Please see attached Exhibit A, Disclosure Respecting Subsidiaries.

Item 8. Identification and Classification of Members of the Group.

     N/A

Item 9. Notice of Dissolution of Group.

     N/A

Item 10. Certification.

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


<PAGE>


                             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.


                                     April 13, 2000
                             -----------------------------
                                        (Date)


                             /s/ Jennifer Lederman
                             -----------------------------
                                      (Signature)


                             Jennifer Lederman /
                             Senior Vice-President,
                             Compliance, RT
                             Capital Management Inc.
                             -----------------------------
                                     (Name/Title)


<PAGE>


                                    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.


                                      April 13, 2000
                              -----------------------------
                                        (Date)


                              /s/ Jennifer Lederman
                              -----------------------------
                                      (Signature)


                              Jennifer Lederman / Senior
                              Vice-President, Compliance,
                              RT Investment Management
                              Holdings Inc.
                              -----------------------------
                                      (Name/Title)


<PAGE>


                                    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.


                                      April 13, 2000
                              -----------------------------
                                        (Date)


                              /s/ Jennifer Lederman
                              -----------------------------
                                      (Signature)


                              Jennifer Lederman
                              Authorized Signing Officer
                              The Royal Trust Company
                              -----------------------------
                                      (Name/Title)




                            EXHIBIT A TO SCHEDULE 13G
                    ITEM 7 DISCLOSURE RESPECTING SUBSIDIARIES


RT Investment Management Holdings Inc, ("RTIM") is a parent holding company as
that term is defined by Rule 13d-1(b)(1)(ii)(G) of the Securities Exchange Act
of 1934 (the "Act") and is eligible to file on Schedule 13G pursuant to an SEC
no-action relief application. RTIM's aggregation holdings represent securities
that are beneficially owned by its subsidiaries which manage these securities on
behalf of their respective clients. RTIM's subsidiaries include, Royal Bank
Investment Management, RT Capital Management Inc., and RT Investment Counsel
Inc.

Royal Bank Investment Management Inc. ("RBIM") is a wholly-owned subsidiary of
RTIM. RBIM is a foreign investment adviser that has received SEC no-action
relief to file on Schedule 13G.

RT Capital Management Inc. ("RT Capital") is a wholly-owned subsidiary of RTIM.
RT Capital is a foreign investment adviser that has received SEC no-action
relief to file on Schedule 13G.

RT Investment Counsel Inc. ("RTIC") is a wholly-owned subsidiary of RTIM. RTIC
is a foreign investment adviser that has received SEC no-action relief to file
on Schedule 13G.

RTIM, RBIM, RT Capital and RTIC are federally incorporated Canadian corporations
whose business addresses are as follows:

RT Investment Management            Royal Bank Investment
Holdings Inc.                       Management Inc.
Royal Trust Tower, P.O. Box 97      Royal Trust Tower, P.O. Box 97
77 King Street West, Suite 3900     77 King Street West, Suite 3800
Toronto, Ontario                    Toronto, Ontario
M5K 1G8                             M5K 1G8

RT Capital Management Inc.          RT Investment Counsel Inc.
Royal Trust Tower, P.O. Box 97      Royal Trust Tower, P.O. Box 97
77 King Street West, Suite 3700     77 King Street West, Suite 3900
Toronto, Ontario                    Toronto, Ontario
M5K 1G8                             M5K 1G8




                            EXHIBIT B TO SCHEDULE 13G
                             JOINT FILING AGREEMENT


Each of the undersigned persons hereby agrees and consents to this joint filing
of Schedule 13G on such person's behalf, pursuant to Section 13(d) and (g) of
the Securities and Exchange Act of 1934, as amended, and the rules promulgated
thereunder. Each of these persons is not responsible for the completeness or
accuracy of the information concerning the other persons making this filing,
unless such persons know or have reason to believe that such information is
inaccurate.

      Dated:  April 13, 2000.

      RT Capital Management Inc.
      BY: /s/ Jennifer Lederman
         ------------------------------------
           Senior Vice-President, Compliance,
           and Corporate Secretary

      RT Investment Management Holdings Inc.
      BY: /s/ Jennifer Lederman
         ------------------------------------
           Senior Vice-President, Compliance,
           and Corporate Secretary

      The Royal Trust Company
      BY: /s/ Jennifer Lederman
         ------------------------------------
           Authorized Signing Officer




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