EXHIBIT 10.15

                                    AGREEMENT

     WHEREAS,  AMCOL  International  Corporation  (the  "Company")  considers it
essential  and in the best  interests  of the  Company and its  shareholders  to
foster the continued employment of its key management personnel;

     WHEREAS,  Gary L.  Castagna  ("Employee")  is  considered a key  management
employee, currently serving as Vice President of the Company; and

     WHEREAS,  the Company desires to assure the future continuity of Employee's
services  in the event of any  actual or  threatened  "Change  in  Control"  (as
defined in Section 6 below) of the Company.

     IT IS THEREFORE AGREED AS FOLLOWS:

     1. Effect of Agreement.

     This  Agreement  shall  be  effective  and  binding  immediately  upon  its
execution. However, except as specifically provided herein, this Agreement shall
not alter  materially  Employee's  duties and obligations to the Company and the
remuneration  and benefits which Employee may reasonably  expect to receive from
the Company in the absence of a Change in Control.


     2. Employment On and After Change in Control.

     Provided that the employee is an employee of the Company  immediately prior
to a Change in Control,  the Company shall employ  Employee,  and Employee shall
accept such  employment,  effective  upon such Change in Control for a period of
twenty-four  (24) months  after said Change in Control  subject to the terms and
conditions stated herein.


     3. Duties After Change in Control.

     Employee  agrees  that during the term of his  employment  with the Company
after a Change in Control,  he shall perform the duties  described in Section 12
below and such other duties for the Company and its subsidiaries consistent with
his  experience  and  training as the Board of  Directors  of the  Company  (the
"Board") or the Board's representatives shall determine from time to time, which
duties shall be at least substantially equal in status, dignity and character to
his duties at the date hereof.  He shall also have the title of  Vice-President.
Employee  further  agrees to devote his entire working time and attention to the
business of the Company and its subsidiaries and use his best efforts to promote
such business.

     4. Compensation Prior to a Change in Control.

     Prior  to  a  Change  in  Control  the  Company   agrees  to  pay  Employee
compensation  for his  services  in an  amount,  and to  provide  him with  life
insurance,  disability,  health and other benefits, at least equal to that which
he  presently  receives,  only with such changes as shall be agreed upon between
Employee and the Company. For the purpose of this Section, compensation does not
include any bonus or other incentive  compensation  plan or stock purchase plan,
which may vary from year to year at the discretion of the Company.

     5. Termination of Employment Prior to a Change of Control.

     Employee shall be entitled to terminate his employment prior to a Change in
Control at any time upon sixty (60) days' prior  written  notice.  The  Company,
shall be able to terminate  Employee's  employment at any time prior to a Change
in Control with or without cause upon sixty (60) days' prior written  notice (or
the payment of salary in lieu  thereof).  This Section shall not be construed to
reduce any  accrued  benefits  payable in  connection  with any  termination  of
Employee's employment prior to a Change in Control.

     Nothing  expressed or implied in this  Agreement  shall create any right or
duty on the part of the  Company  or  Employee  to have  Employee  remain in the
employment of the Company prior to a Change in Control.


     6. Termination of Employment On or After Change in Control.

          (a) For purposes of this  Agreement the term "Change in Control" means
     the change in the legal or beneficial  ownership of fifty-one percent (51%)
     of the shares of the Company's common stock within a six-month period other
     than by death or operation of law, or the sale of ninety  percent  (90%) or
     more of the Company's assets within a six-month period.

          (b)  Employee's  employment  on and after a Change in  Control  may be
     terminated  with just  cause by the  Company at any time upon not less than
     ten (10) days' prior written notice. Prior to termination for just cause on
     and after a Change in  Control,  the Board of  Directors  shall by majority
     vote  have  declared  that   Employee's   termination  is  for  just  cause
     specifically stating the basis for such determination.  In the event such a
     termination  occurs,  the  provisions  of Sections  9(a) and 12 below shall
     apply.

          Employee's  employment  may be  terminated  on or  after a  Change  in
     Control  without  just  cause  pursuant  to  the  constructive  termination
     procedures  described  in  the  next  paragraph  or by the  Company  giving
     Employee not less

     than  thirty  (30) days'  prior  written  notice.  In the event  Employee's
     employment is terminated pursuant to the preceding sentence:

               (i) the provisions of Section 9(b) below shall apply; and

               (ii)  although   Employee's   employment  term  shall  be  deemed
          terminated  at the end of such  notice  period  (or,  in the case of a
          constructive  termination  described in the next paragraph,  as of the
          date  Employee  notifies  the  Company  of  such  termination),   such
          termination  shall  in no way  affect  the term of this  Agreement  or
          Employee's duties and obligations under Section 12 below.

               For purposes of this Section 6(b),  Employee  shall be considered
          as  having  been  terminated  by the  Company  on or after a Change in
          Control for other than just cause  provided  that he has  notified the
          Company of any of the following within ten (10) days of the occurrence
          thereof:

               (i)  the  assignment to Employee of any duties of lesser  status,
                    dignity and character than his duties  immediately  prior to
                    the effective date of the Change in Control or a substantial
                    reduction  in the  nature or status of his  responsibilities
                    from those in effect immediately prior to the effective date
                    of the Change in Control;

               (ii) a  post-Change  in  Control  reduction  by  the  Company  in
                    Employee's annual base salary or bonus or incentive plan (as
                    in effect  immediately  prior to the  effective  date of the
                    Change in Control);

               (iii)relocation of Employee's  office to a location which is more
                    than  35  miles  from  the   location   in  which   Employee
                    principally  works for the Company  immediately prior to the
                    effective  date of the Change in Control;  the relocation of
                    the appropriate principal executive office of the Company or
                    the Company's  operating  division or  subsidiary  for which
                    Employee  performed  the  majority of his  services  for the
                    Company  during the year prior to the effective  date of the
                    Change in Control to a location  which is more than 35 miles
                    from the location of such office  immediately  prior to such
                    date; or his being

                    required  by the  Company  in order  to  perform  duties  of
                    substantially  equal status,  dignity and character to those
                    duties he performed  immediately prior to the effective date
                    of the Change in Control to travel on the Company's business
                    to a  substantially  greater extent than is consistent  with
                    his business travel obligations as of such date; or

               (iv) the failure of the  Company to continue to provide  Employee
                    with benefits  substantially  equivalent to those enjoyed by
                    him  under any of the  Company's  life  insurance,  medical,
                    health  and  accident  or  disability  plans in which he was
                    participating immediately prior to the effective date of the
                    Change in  Control,  the taking of any action by the Company
                    which would directly or indirectly  materially reduce any of
                    such benefits or deprive him of any material  fringe benefit
                    enjoyed by him  immediately  prior to effective  date of the
                    Change in Control,  or the failure of the Company to provide
                    him with at least the number of paid  vacation days to which
                    he is  entitled  on the basis of years of service  under the
                    Company's normal vacation policy in effect immediately prior
                    to the effective date of the Change in Control.

          (c) In the event  Employee's  employment  is  terminated on or after a
     Change in Control in any manner not described in Section 6(b) above:

               (i)  the  provisions of Section 9(b) shall not apply and Employee
                    shall  instead  receive the sums and  benefits  described in
                    Section 9(a); and

               (ii) such  termination  shall in no way  affect  the term of this
                    Agreement or Employee's  duties or obligations under Section
                    12 below.

          (d)  Any   termination   of  employment  of  Employee   following  the
     commencement  of any  discussions by a shareholder or group of shareholders
     owning  legally or  beneficially  more than 20% of the  common  stock or an
     officially designated representative of the Board of Directors with a third
     party that  results  within 180 days in a Change in Control  shall  (unless
     such termination is for cause or wholly  unrelated to such  discussions) be
     deemed to be a termination of Employee on and after a Change in Control for
     purposes of this Agreement.

     7. Notice of Termination.

     Any  termination  by the Company or  assertion of  termination  by Employee
shall be communicated by written notice of termination to the other party at the
following address:

AMCOL International Corporation         Gary L. Castagna
One North Arlington                     Vice-President
1500 West Shure Drive                   AMCOL International Corporation
Arlington Heights, IL 60004             One North Arlington
ATTN: Chairman of the Board             1500 West Shure Drive
                                        Arlington Heights, IL 60004

     8. Disability.

     If as a result of Employee's  incapacity due to physical or mental illness,
he shall have been  absent  from his duties  with the  Company  for one  hundred
eighty  (180) days  within any twelve (12)  consecutive-month  period and within
thirty (30) days after written  notice of the  Company's  intention to terminate
his employment is given,  Employee shall not have returned to the performance of
his duties with the Company  substantially on a full-time basis, the Company may
terminate his employment for disability. This shall not constitute a termination
for the purposes of obtaining benefits pursuant to Section 9.


     9. Benefits Upon  Termination And Leave Of Employment On or After Change in
the Control.

          (a) If Employee is  terminated  for just cause on or after a Change in
     Control, he shall only receive the accrued sums and benefits payable to him
     through the date he is  terminated;  the  provisions  of Section 9(b) below
     shall not be  applicable  in such case and  Employee  shall not receive (or
     shall cease receiving) the payments and benefits described in Section 9(b).

          (b) Subject to Employee's  compliance  with the  provisions of Section
     12(a) below, if Employee is terminated  during the  twenty-four  (24) month
     period beginning on and continuing after a Change in Control other than for
     just  cause  (either  at the  discretion  of the  Company's  management  or
     constructively  by the  operation  of  Section  6),  he shall  receive  the
     following  payments  and  benefits  in lieu of any other  sums or  benefits
     otherwise payable to him by the Company:

               (i)  all then accrued pay, benefits,  executive  compensation and
                    fringe  benefits,  including  (but not  limited to) pro rata
                    bonus and incentive plan earnings;

               (ii) medical,   health   and   disability   benefits   which  are
                    substantially   similar  to  the  benefits  the  Company  is
                    providing him as of the date of his employment is terminated
                    for a period of twenty-four (24) months there-after; and

               (iii)one   dollar   less   than  two   times   his  base   period
                    compensation.


          The  foregoing  payments  and  benefits  shall be deemed  compensation
     payable for the duties to be performed  by Employee  pursuant to Section 12
     below.  For  purposes  of  this  Agreement,  (A)  Employee's  "base  period
     compensation" is the average annual "compensation" (as defined below) which
     was  includable  in his gross  income for his base period  (i.e.,  his most
     recent five taxable years ending before the date of the Change in Control);
     and (B) if  Employee's  base period  includes a short  taxable year or less
     than all of a  taxable  year,  compensation  for such  short or  incomplete
     taxable year shall be  annualized  before  determining  his average  annual
     compensation  for  the  base  period.  (In  annualizing  compensation,  the
     frequency with which payments are expected to be made over an annual period
     shall be taken into account.  Thus, any amount of  compensation  for such a
     short or incomplete  taxable year that  represents a payment that would not
     be made more than once per year shall not be  annualized).  The sum payable
     to  Employee  pursuant to Section  9(b)(iii)  shall in any and all cases be
     reduced by any compensation  which Employee  receives from the Company from
     the date of the Change in Control until the termination date, excluding any
     non-qualified  deferred  compensation,  stock option  compensation or other
     stock  incentive  bonus plan  compensation  so  received.  For  purposes of
     Section 9(iii) and the definitions  pertaining to said Section,  Employee's
     "compensation" is the compensation  which was payable to him by the Company
     or a related entity determined  without regard to the following Sections of
     the Internal Revenue Code of 1986, as amended (the "Code"):  125 (cafeteria
     plans),  402(a)(8) (cash or deferred arrangements),  402(h)(1)(B) (elective
     contributions  to  simplified  employee  pensions),  and,  in the  case  of
     employer  contributions  made  pursuant  to a salary  reduction  agreement,
     403(b) (tax sheltered annuities).

          Except for the benefits  described in Section 9(b)(ii) above, the sums
     due  pursuant to this  Section 9(b) shall be paid in up to three (3) annual
     installments

     commencing  thirty  (30) days after the sums become due. If on or after the
     date any payment becomes due hereunder the Company at any time has a funded
     debt-to-total  capitalization  ratio  which  equals or  exceeds  1:1,  upon
     Employee's  written  request,  the Company  shall secure its payment of the
     remaining  annual  installments  with a letter of credit or other  security
     instrument  as shall be reasonably  acceptable to Employee.  Such letter of
     credit or other security instrument shall provide Employee with the ability
     to receive the remaining  installment(s) only if his payment is delinquent.
     All sums due  hereunder  shall be subject to  appropriate  withholding  and
     statutory  requirements.  Employee  shall not be required  to mitigate  the
     amount of any payment  provided for in this  Section 9(b) by seeking  other
     employment or otherwise.  Notwithstanding  anything  stated in this Section
     9(b) to the  contrary,  however,  the  amount  of any  payment  or  benefit
     provided  for in this  Section 9(b) shall be reduced by no more than 50% by
     any  compensation  earned by Employee as a result of  employment by another
     employer and the Company shall not be required to provide  medical,  health
     and/or  disability  benefits to the extent such  benefits  would  duplicate
     benefits  received by Employee in connection  with his employment  with any
     new employer.

          Notwithstanding  anything stated in this Agreement to the contrary, if
     the  amounts  which are  payable  and the  benefits  which are  provided to
     Employee under this Agreement, either alone or together with other payments
     which  Employee  has a right  to  receive  from the  Company  or any of its
     affiliates,  would  constitute  a  "parachute  payment" (as defined in Code
     Section 280G), such amounts and benefits shall be reduced, as necessary, to
     the  largest  amount  as will  result in no  portion  of said  amounts  and
     benefits  being either not  deductible  as a result of Code Section 280G or
     subject to the excise tax imposed by Code Section 4999.  The  determination
     of any  reduction in said amounts and  benefits  pursuant to the  foregoing
     proviso shall be made by the Company in good faith, and such  determination
     shall be  conclusive  and  binding on  Employee.  The  amounts  provided to
     Employee  under this Agreement in connection  with a Change in Control,  if
     any, shall be deemed  allocated to such amounts and/or  benefits to be paid
     and/or  provided as the Company's Board of Directors in its sole discretion
     shall determine.


     10.  Special Situations.

     The parties recognize that under certain  circumstances a Change in Control
may occur under conditions  which make it inappropriate  for Employee to receive
the termination  benefits or protection set forth in this Agreement.  Therefore,
in the  event  that a Change  in  Control  occurs  for any one of the  following
reasons, the provisions of Sections 2, 6 and 9 shall not apply:

          (a) the purchase of more than fifty  percent (50%) of the stock of the
     Company by an employee  stock  ownership plan or similar  employee  benefit
     plan of which Employee is a participant; or

          (b) the  purchase  of more than  fifty  percent  (50%) of the stock or
     ninety percent (90%) of the assets of the Company by a group of individuals
     or entities  including  Employee as a member or participant,  including but
     not limited to those  transactions  commonly  known as a leveraged or other
     forms of management buyouts.

     11. Disputes.

     Any  dispute  arising  under this  Agreement  (except  Section 12) shall be
promptly  submitted to arbitration  under the Rules of the American  Arbitration
Association.  An arbitrator is to be mutually agreed upon by the parties or upon
failure of agreement, designated by the American Arbitration Association.

     12. Non-Competition, Non-Solicitation, and Confidentiality.

          (a) In  consideration  of this  Agreement  and other good and valuable
     consideration,  Employee  agrees  that for so long as he is employed by the
     Company and for twenty-four (24) months thereafter he shall not own manage,
     operate,  control,  be employed by or otherwise  engage in any  competitive
     business.  Employee's agreement pursuant to the preceding sentence shall be
     in addition to any other agreement or legal  obligation he may have with or
     to the Company.  For purposes of the  preceding  sentence,  a  "competitive
     business" is any business engaged in the production,  refinement or sale of
     bentonite  or similar  minerals,  absorbent  polymers  and/or any  business
     conducted by the Company,  its affiliates or any subsidiaries thereof as of
     the date Employee's employment is terminated. A business which is conducted
     by the Company,  its affiliates or any  subsidiaries  which is subsequently
     sold by the  Company  is not a  competitive  business  as of the date  such
     business is sold. An "affiliate" of the Company is any company which either
     controls, is controlled by or is under common control with the Company. The
     phrase "any  business  conducted  by the  Company,  its  affiliates  or any
     subsidiaries thereof" includes not only current businesses but also any new
     products,   product   lines  or  use  of   processes   under   development,
     consideration or  investigation on the date Employee's  employment with the
     Company is terminated.

          Employee  also agrees that during the  twenty-four  (24) month  period
     described in the first  sentence of this Section 12(a) he will not directly
     or

     indirectly,  on behalf of  himself or any other  person or  entity,  make a
     solicitation or conduct business,  with any customer or potential  customer
     of the Company with which he had contact while employed by the Company, its
     affiliates and/or any subsidiaries thereof, with respect to any products or
     services which are competitive with any business  conducted by the Company,
     its affiliates or any subsidiaries  thereof.  For purposes of the preceding
     sentence,  a "customer" is any person or entity that has purchased goods or
     services  from the Company,  its  affiliates  or any  subsidiaries  thereof
     within the  twenty-four  (24) month  period  ending on the date  Employee's
     employment is  terminated.  A "potential  customer" is any person or entity
     that the Company  solicited for business within twelve (12) months prior to
     the date Employee's employment with the Company is terminated.

          The Company and  Employee  recognize  that his  responsibilities  have
     included contacts with, and analysis of, customers and potential  customers
     throughout the United States and certain foreign countries,  in addition to
     certain operational  matters.  Employee's contacts on behalf of the Company
     represent  a  substantial  asset  of the  Company  which  are  entitled  to
     protection.  In recognition of this  situation,  the covenants set forth in
     this Section 12 shall apply to competition  and  solicitation in the United
     States,  United  Kingdom,  Germany,  Japan,  Canada,  Thailand,  and  those
     countries  in which the Company,  its  affiliates  and/or the  subsidiaries
     thereof has (have)  conducted  $200,000 or more of the business  during the
     12-month period ending on the date  Employee's  employment with the Company
     is terminated.

          Before and forever  after his  termination  or  resignation,  Employee
     shall keep  confidential  and refrain from utilizing or  disseminating  any
     confidential,  proprietary  or trade secret  information of the Company for
     any purpose other than furthering the business interests of the Company.

          (b) During  Employee's  employment  hereunder and during two (2) years
     following his  resignation or the  termination of his employment  hereunder
     for any  reason,  Employee  will not  induce or attempt  to  influence  any
     present  or  future  employee  of  the  Company,   its  affiliates  or  any
     subsidiaries thereof to leave its employ.


          13. Other Agreements.

          Except to the extent expressly set forth herein,  this Agreement shall
     not  modify or lessen any  benefit or  compensation  to which  Employee  is
     entitled under any agreement  between Employee and the Company or under any
     plan maintained by the Company in which he  participates  or  participated.
     Benefits or compensation shall be payable thereunder, if at all,

     according to the terms of the applicable plan(s) or agreement(s). The terms
     of this Agreement shall supersede any existing  agreement  between Employee
     and the  Company  executed  prior to the date hereof to the extent any such
     Agreement is inconsistent with the terms hereof.


     14. Successors; Binding Agreement.

     The Company  will  require  any  successor  (whether  direct or indirect by
purchase, merger, consolidation or otherwise, to all or substantially all of the
business and/or assets of the Company) to expressly  assume and agree to perform
this  Agreement in the same manner and to the same extent that the Company would
be required to perform it if no such succession had taken place.

     This  Agreement  shall  inure  to the  benefit  of and  be  enforceable  by
Employee's  personal  or  legal  representatives,   executors,   administrators,
successors, heirs, distributees, devisees and legatees.

     15. Injunction.

     The remedy at law for any breach of Section 12 will be  inadequate  and the
Company, its affiliates and any subsidiaries thereof would suffer continuing and
irreparable  injury to their  business  as a direct  result of any such  breach.
Accordingly, notwithstanding anything stated herein, if Employee shall breach or
fail to perform  any term,  condition  or duty  contained  in Section 12 hereof,
then,  in such event,  the Company  shall be entitled to institute and prosecute
proceedings in any court of competent jurisdiction,  either in law or in equity,
to obtain the  specific  performance  thereof by Employee or to seek a temporary
restraining order or injunctive  relief,  without any requirement to show actual
damages or post bond,  to restrict  Employee from  violating  the  provisions of
Section 12;  however,  nothing  herein shall be construed to prevent the Company
seeking such other remedy in the courts, in case of any breach of this Agreement
by  Employee,  as the  Company  may elect or invoke.  If court  proceedings  are
instituted by the Company to enforce  Section 12 hereof,  and the Company is the
prevailing party, the Company shall receive, in addition to any damages awarded,
reasonable attorneys' fees, court costs and ancillary expenses.


     16. Miscellaneous.

     This  Agreement  may not be modified  or  discharged  unless  such  waiver,
modification  or  discharge  is agreed to in writing and signed by Employee  and
such officers of the Company as may be specifically  designated by its Board for
that purpose.  Except for any failure to give the ten (10) day notice  described
in Section 6(b) above,  the failure of either party to this  Agreement to object
to any breach by the other party or the non-breaching party's conduct or

conduct  forbearance  shall not  constitute a waiver of that  party's  rights to
enforce  this  Agreement.  No waiver by either  party  hereto at any time of any
breach by the other  party  hereto of, or  compliance  with,  any  condition  or
provision of this  Agreement to be performed by such other party shall be deemed
a  waiver  of any  subsequent  breach  by such  other  party or any  similar  or
dissimilar provisions or conditions at the same or any prior or subsequent time.
No agreements or representations,  oral or otherwise,  express or implied,  with
respect to the subject  matter  hereof have been made by either  party which are
not  expressly  set  forth  in this  Agreement.  The  validity,  interpretation,
construction  and performance of this Agreement shall be governed by the laws of
the State of Illinois.


     17. Severability.

     The  parties  hereto  intend this  Agreement  to be enforced to the maximum
extent  permitted by law. In the event any provision of this Agreement is deemed
to be invalid or  unenforceable  by any court of  competent  jurisdiction,  such
provisions  shall be deemed to be restricted  in scope or otherwise  modified to
the extent necessary to render the same valid and enforceable.  In the event the
provisions  of Section 12 cannot be modified or restricted so as to be valid and
enforceable,  then  the  same as well as the  Company's  obligation  to make any
payment or transfer any benefit to Employee in connection  with any  termination
of Employee's  employment shall be deemed excised from this Agreement,  and this
Agreement  shall be construed and enforced as if such  provisions had originally
been  incorporated  herein as so restricted or modified or as if such provisions
had not originally been contained  herein, as the case may be. The invalidity or
unenforceability  of any  provision  of this  Agreement  shall  not  affect  the
validity or  enforceability of any other provision of this Agreement which shall
remain in full force and effect.


     18. Survival.

     The  obligations of the parties under this Agreement shall survive the term
of this Agreement.

     19. Term of Agreement.

     The term of this Agreement shall commence on April 1, 1998 and end on March
31,  2001.  Provided,  however,  that  in the  event  Employee's  employment  is
terminated while this Agreement is in force, this Agreement shall terminate when
the Company has made all  payments to Employee  required by Section 9 hereof and
Employee has complied  with the duties and  obligations  described in Section 12
hereof  (all of which  duties and  obligations  shall  specifically  survive the
termination of the Employee's employment). To the extent necessary

for the Company's  enforcement  of the  provisions of Section 12 above (but only
for such  purpose),  Employee's  employment  term  shall be deemed  to  continue
through the end of the Agreement term.

Date:

Employee                                AMCOL International Corporation


/s/ Gary L. Castagna                    By:  /s/ John Hughes
Gary L. Castagna                        Its: President & CEO