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



                                  SCHEDULE 13D


                    UNDER THE SECURITIES EXCHANGE ACT OF 1934


                                (Amendment No. 1)


                    Kiwa Bio-Tech Products Group Corporation
--------------------------------------------------------------------------------
                                (Name of Issuer)


                    Common Stock, par value $0.001 per share
--------------------------------------------------------------------------------
                         (Title of Class of Securities)


                                    49834X106
--------------------------------------------------------------------------------
                                 (CUSIP Number)


                    Kiwa Bio-Tech Products Group Corporation
                        17700 Castleton Street, Suite 589
                       City of Industry, California 91748
                         Attention: Corporate Secretary


                                 With a copy to:


                             V. Joseph Stubbs, Esq.
--------------------------------------------------------------------------------
                         Stubbs Alderton & Markiles, LLP
                       15821 Ventura Boulevard, Suite 525
                            Encino, California 91436
       (Name, Address and Telephone Number of Person Authorized to Receive
                          Notices and Communications)


                                 April 22, 2004
--------------------------------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)


If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  that is the subject of this  Schedule  13D, and is filing this
schedule  because of Rule 13d-1(e),  Rule 13d-1(f) or Rule  13d-1(g),  check the
following box. [ ]

                         (Continued on following pages)





CUSIP No. 49834X106                SCHEDULE 13D                Page 2 of 7 Pages


________________________________________________________________________________
1    NAME OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

        InvestLink (China) Limited

________________________________________________________________________________
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                 (a)  [_]
                                                                 (b)  [X]

________________________________________________________________________________
3    SEC USE ONLY



________________________________________________________________________________
4    SOURCE OF FUNDS*

        OO

________________________________________________________________________________
5    CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
     PURSUANT TO ITEMS 2(d) OR 2(e)                                   [_]



________________________________________________________________________________
6    CITIZENSHIP OR PLACE OF ORGANIZATION

        British Virgin Islands

________________________________________________________________________________
               7    SOLE VOTING POWER

  NUMBER OF             -0-

   SHARES      _________________________________________________________________
               8    SHARED VOTING POWER
BENEFICIALLY
                        -10,062,088- (See Response to Item 5)
  OWNED BY
               _________________________________________________________________
    EACH       9    SOLE DISPOSITIVE POWER

  REPORTING             -0-

   PERSON      _________________________________________________________________
               10   SHARED DISPOSITIVE POWER
    WITH
                        -10,062,088- (See Response to Item 5)

________________________________________________________________________________
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        10,062,088 (See Respone to Item 5)

________________________________________________________________________________
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*

                                                                      [_]

________________________________________________________________________________
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

        28.8% (See Response to Item 5)

________________________________________________________________________________
14   TYPE OF REPORTING PERSON*

        CO

________________________________________________________________________________
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                  Page 2 of 7



CUSIP No. 49834X106                SCHEDULE 13D                Page 3 of 7 Pages


________________________________________________________________________________
1    NAME OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

        Da-chang Ju

________________________________________________________________________________
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                 (a)  [_]
                                                                 (b)  [X]

________________________________________________________________________________
3    SEC USE ONLY



________________________________________________________________________________
4    SOURCE OF FUNDS*

        OO

________________________________________________________________________________
5    CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
     PURSUANT TO ITEMS 2(d) OR 2(e)                                   [_]



________________________________________________________________________________
6    CITIZENSHIP OR PLACE OF ORGANIZATION

        People's Republic of China

________________________________________________________________________________
               7    SOLE VOTING POWER

  NUMBER OF             -0-

   SHARES      _________________________________________________________________
               8    SHARED VOTING POWER
BENEFICIALLY
                        -10,062,088- (See Response to Item 5)
  OWNED BY
               _________________________________________________________________
    EACH       9    SOLE DISPOSITIVE POWER

  REPORTING             -0-

   PERSON      _________________________________________________________________
               10   SHARED DISPOSITIVE POWER
    WITH
                        -10,062,088- (See Response to Item 5)

________________________________________________________________________________
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        10,062,088 (See Response to Item 5)

________________________________________________________________________________
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*

                                                                      [_]

________________________________________________________________________________
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

        28.8%

________________________________________________________________________________
14   TYPE OF REPORTING PERSON*

        IN

________________________________________________________________________________
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                  Page 3 of 7



ITEM 1.  SECURITY AND ISSUER.

         This  amendment to Schedule 13D amends the Schedule 13D dated March 25,
2004 (the "13D").

         This  amendment to Schedule 13D relates to the common stock,  par value
$0.001  per  share  (the  "Common  Stock"),  of  Kiwa  Bio-Tech  Products  Group
Corporation,  a Utah  corporation,  formerly known as Tintic Gold Mining Company
(the "Company" or the "Issuer"), and is being filed pursuant to Rule 13d-2 under
the Securities Exchange Act of 1934, as amended (the "Exchange Act").

         The address of the principal  executive offices of the Company is 17700
Castleton Street, Suite 589, City of Industry, California 91748.

ITEM 2.  IDENTITY AND BACKGROUND.

(a)      This Statement is hereby filed by InvestLink (China) Limited, a British
Virgin   Island   corporation   formerly   known  as  Peace  Land  Venture  Ltd.
("InvestLink")  and  Da-chang  Ju  ("Ju",  and  together  with  InvestLink,  the
"Reporting Persons").

(b)      The business address of InvestLink is c/o Kiwa Bio-Tech  Products Group
Corporation,  17700 Castleton  Street,  Suite 589, City of Industry,  California
91748.

         The  business  address  of Ju  is  c/o  Kiwa  Bio-Tech  Products  Group
Corporation,  17700 Castleton  Street,  Suite 589, City of Industry,  California
91748.

(c)      InvestLink   is  primarily   engaged  in  the  business  of  technology
investment and services.  Ju's present principal occupation is a director of the
Company.

(d)      During  the last five  years,  neither  InvestLink  nor Ju has not been
convicted in a criminal  proceeding  (excluding  traffic  violations  or similar
misdemeanors).

(e)      During the last five years,  neither InvestLink nor Ju was a party to a
civil proceeding of a judicial or administrative body of competent  jurisdiction
which resulted in either InvestLink or Ju being subject to a judgment, decree or
final  order  enjoining  future  violations  of,  or  prohibiting  or  mandating
activities subject to, Federal or State securities laws or finding any violation
with respect to such laws.

(f)      Ju is a citizen of the People's Republic of China.

ITEM 3.  SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.

         On March 15,  2004,  pursuant to an  Agreement  and Plan of Merger (the
"Merger  Agreement") dated as of March 11, 2004, by and among Tintic Gold Mining
Company, a Utah corporation  ("Tintic"),  TTGM Acquisition  Corporation,  a Utah
corporation  and  wholly-owned  subsidiary of Tintic  ("Merger  Sub"),  and Kiwa
Bio-Tech  Products Group Ltd., a company  governed under the laws of the British
Virgin Islands  ("Kiwa"),  Merger Sub merged with and into Kiwa (the  "Merger").
Each share of Kiwa common stock was converted  into  1.5445839  shares of Tintic
Common  Stock,  with Kiwa  surviving as Tintic's  wholly-owned  subsidiary.  The
merger resulted in a change of control of Tintic,  with former Kiwa shareholders
owning  approximately  89% of Tintic  on a fully  diluted  basis.  A copy of the
Merger  Agreement  was filed as EXHIBIT A to the 13D.  Prior to the Merger,  the
Reporting  Persons held  1,000,000  shares of Kiwa,  which were  converted  into
1,544,584  shares  of Tintic  Common  Stock at the  closing  of the  Merger.  In
addition,  the  Reporting  Persons were issued  408,438  shares of Tintic Common
Stock at the


                                  Page 4 of 7



closing of the Merger as custodian for Gui-Sheng Chen. Prior to the Merger,  the
408,434  shares of the Common Stock equated to  approximately  264,432 shares of
Kiwa.

         Subsequent  to the Merger,  Tintic  changed  its name to Kiwa  Bio-Tech
Products  Group  Corporation  and effected a 4-for-1 stock split.  The 1,544,584
shares of Tintic Common Stock held by the Reporting  Persons were converted into
6,178,336  shares of the Common Stock. The 408,438 shares of Tintic Common Stock
held by the Reporting  Persons as custodian for  Gui-Sheng  Chen were  converted
into 1,633,752  shares of the Common Stock.  In addition,  as of April 22, 2004,
the Reporting  Persons were issued an additional  2,250,000 shares of the Common
Stock as custodian for Gui-Sheng Chen.

ITEM 4.  PURPOSE OF THE TRANSACTION.

         The Reporting Persons acquired the Common Stock pursuant to the Merger.
The  Reporting  Persons have no plans or proposals  which relate or would result
in: (a) the acquisition by any person of additional securities of the Issuer, or
the  disposition  of securities of the Issuer;  (b) an  extraordinary  corporate
transaction,  such as a merger,  reorganization  or  liquidation,  involving the
Issuer or any of its  subsidiaries;  (c) a sale or transfer of a material amount
of  assets  of the  Issuer  or any of its  subsidiaries;  (d) any  change in the
present board of directors or  management of the Issuer,  including any plans or
proposals  to change the  number or term of  directors  or to fill any  existing
vacancies on the board; (e) any material change in the present capitalization or
dividend  policy of the Issuer;  (f) any other  material  change in the Issuer's
business or corporate structure;  (g) changes in the issuer's charter, bylaws or
instruments  corresponding  thereto  or  other  actions  which  may  impede  the
acquisition  of  control  of the Issuer by any  person;  (h)  causing a class of
securities of the Issuer to be delisted from a national  securities  exchange or
to cease to be authorized to be quoted in an inter-dealer  quotation system of a
registered national securities association;  (i) a class of equity securities of
the issuer becoming eligible for termination of registration pursuant to Section
12(g)(4) of the Securities Act of 1933, as amended; or (j) any action similar to
any of those enumerated above.

ITEM 5.  INTEREST IN SECURITIES OF THE ISSUER.

(a)      InvestLink  directly owns  6,178,336  shares of the Common  Stock,  and
3,883,752  shares of the  Common  Stock as  custodian  for  Gui-Sheng  Chen,  or
approximately 28.8% of the Common Stock based on a total of 34,930,248 shares of
the Common Stock outstanding as of March 29, 2004. Ju is a principal shareholder
of InvestLink and may be deemed to  beneficially  own such shares.  Ju disclaims
beneficial  ownership in all shares held by  InvestLink  except to the extent of
his pecuniary interest therein.

(b)      InvestLink is a British  Virgin  Islands  corporation  of which Ju is a
principal shareholder.  InvestLink has the sole power to vote or direct the vote
and dispose or direct the disposition of 10,062,088  shares of the Common Stock.
Ju may be deemed to  beneficially  own such shares.  Ju disclaims any beneficial
ownership  in shares of the  Company's  stock held by  InvestLink  except to the
extent of his pecuniary interest therein.

(c)      Other than the  transactions  associated  with the Merger and the stock
split outlined in this  Information  Statement,  the Reporting  Persons have not
engaged in any transactions in the Common Stock during the past sixty (60) days.

(d)      Not applicable.

(e)      Not applicable.


                                  Page 5 of 7



ITEM 6.  CONTRACTS,  ARRANGEMENTS,  UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT
TO SECURITIES OF THE ISSUER.

         There are no contracts,  arrangements,  understandings or relationships
(legal or otherwise)  among the persons named in Item 2 and between such persons
and any person with respect to any  securities of the Issuer,  including but not
limited to transfer or voting of any of the  securities,  finder's  fees,  joint
ventures,  loan or option  arrangements,  puts or calls,  guarantees of profits,
division of profits or loss, or the giving or withholding of proxies.

ITEM 7.  MATERIAL TO BE FILED AS EXHIBITS.

1. The Power of Attorney is attached hereto as Exhibit A.


                                  Page 6 of 7



                                   SIGNATURE

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


Date:    April 26, 2004

                           INVESTLINK (CHINA) LIMITED,
                           a British Virgin Islands corporation


                           By:  /s/ James Nian Zhan
                                -------------------------------
                           Name: James Nian Zhan, as attorney-in-fact for
                                 Da-chang Ju




                           By:  /s/ James Nian Zhan
                                -------------------------------
                           Name: James Nian Zhan, as attorney-in-fact for
                                 Da-chang Ju


                                  Page 7 of 7



                                                                       EXHIBIT A

                               POWER OF ATTORNEY

         The undersigned  hereby constitutes and appoints James Nian Zhan as the
undersigned's true and lawful attorney-in-fact to:

         (1) execute for and on behalf of the undersigned,  in the undersigned's
capacity as an officer  and/or  director of Tintic Gold Mining  Company,  a Utah
corporation (the "COMPANY"),  Forms 3, 4, and 5 in accordance with Section 16(a)
of the Securities  Exchange Act of 1934, as amended (the "EXCHANGE ACT") and the
rules  thereunder and Schedules 13D and 13G in accordance with Regulation 13D of
the Exchange Act;

         (2) do  and  perform  any  and  all  acts  for  and  on  behalf  of the
undersigned which may be necessary or desirable to complete and execute any such
Form 3, 4, or 5, or Schedule 13D or 13G,  complete and execute any  amendment or
amendments  thereto,  and timely  file such form and  schedules  with the United
States  Securities  and Exchange  Commission  and any stock  exchange or similar
authority; and

         (3) take any other action of any type whatsoever in connection with the
foregoing which, in the opinion of such attorney-in-fact,  may be of benefit to,
in the best  interest  of, or legally  required  by, the  undersigned,  it being
understood that the documents executed by such attorney-in-fact on behalf of the
undersigned  pursuant to this Power of Attorney  shall be in such form and shall
contain such terms and conditions as such  attorney-in-fact  may approve in such
attorney-in-fact's discretion.

         The undersigned hereby grants to each such  attorney-in-fact full power
and  authority  to do and  perform  any  and  every  act  and  thing  whatsoever
requisite,  necessary, or proper to be done in the exercise of any of the rights
and  powers  herein  granted,  as  fully  to all  intents  and  purposes  as the
undersigned  might  or  could  do if  personally  present,  with  full  power of
substitution  or  revocation,  hereby  ratifying  and  confirming  all that such
attorney-in-fact,  or such attorney-in-fact's  substitute or substitutes,  shall
lawfully  do or cause to be done by virtue  of this  power of  attorney  and the
rights  and  powers  herein  granted.  The  undersigned  acknowledges  that  the
foregoing  attorneys-in-fact,  in serving in such capacity at the request of the
undersigned,  are  not  assuming,  nor  is  the  Company  assuming,  any  of the
undersigned's  responsibilities  to comply with Section 16 or Regulation  13D of
the Exchange Act.

         This Power of Attorney  shall remain in full force and effect until the
undersigned is no longer required to file Forms 3, 4, and 5 or Schedules 13D and
13G with respect to the undersigned's holdings of and transactions in securities
issued by the Company,  unless  earlier  revoked by the  undersigned in a signed
writing delivered to the foregoing attorneys-in-fact.

         IN WITNESS  WHEREOF,  the undersigned has caused this Power of Attorney
to be executed as of this 18th day of March, 2004.

                                     /s/ Da-chang Ju
                                     ------------------------------
                                     Signature

                                     Da-chang Ju
                                     ------------------------------
                                     Print Name