Document:

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                                                                    EXHIBIT 10.2

                               AMENDMENT NO.  2
                            TO THE CREDIT AGREEMENT

                                         Dated as of March 15, 2000

          AMENDMENT NO. 2 TO THE CREDIT AGREEMENT among BMAC Holdings, Inc., a
Delaware corporation (the "Parent Guarantor"), Better Minerals & Aggregates
Company, a Delaware corporation (the "Borrower"), the banks, financial
institutions and other institutional lenders parties to the Credit Agreement
referred to below (collectively, the "Lenders"), and Banque Nationale de Paris
("BNP"), as the initial issuing bank (the "Initial Issuing Bank"), as the swing
line bank (the "Swing Line Bank"), and as agent (together with any successors
appointed pursuant to Article VII, the "Agent") for the Lender Parties.

          PRELIMINARY STATEMENTS:

          (1)  The Borrower, the Lenders and the Agent have entered into a
Credit Agreement dated as of September 30, 1999 and amended as of December 31,
1999 (as the same may be further amended, supplemented or otherwise modified
through the date hereof, the "Credit Agreement"). Capitalized terms not
otherwise defined in this Amendment have the same meanings as specified in the
Credit Agreement.

          (2)  The Borrower and the Required Lenders have agreed to amend the
Credit Agreement as hereinafter set forth.

          SECTION 1.  Amendments to Credit Agreement.  The Credit Agreement is,
                      ------------------------------
on the Effective Date, hereby amended as follows:

     (a)  The definition of "EBITDA" is amended by inserting, prior to the
period at the end thereof, the following:

          "provided, further, that EBITDA shall be adjusted by increasing EBITDA
           --------  -------
     with the following amounts: (A) with respect to the Rolling Period ending
     on March 31, 2000, (1) bonuses and fees paid by CSC related to the
     Acquisition in an aggregate amount of $370,000, (2) certain family salaries
     paid by CSC in an aggregate amount of $287,502, (3) royalties paid by CSC
     to certain family trusts in an aggregate amount of $463,095 and (4) certain
     fair market value inventory adjustments made by CSC in an aggregate amount
     of $307,335, (B) with respect to the Rolling Period ending on June 30,
     2000, (1) bonuses and fees paid by CSC related to the Acquisition in an
     aggregate amount of $370,000, (2) certain family salaries paid by CSC in an
     aggregate amount of $143,751, (3) royalties paid by CSC to certain family
     trusts in an aggregate amount of
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                                       2

     $463,095, and (4) certain fair market value inventory adjustments made by
     CSC in an aggregate amount of $307,335 and (C) with respect to the Rolling
     Period ending on September 30, 2000, certain fair market value inventory
     adjustments made by CSC in an aggregate amount of $307,335".

     (b)  The definition of "Interest Coverage Ratio" is amended by inserting,
prior to the period at the end thereof, the following:

          "multiplied by the Annualization Factor".

     (c)  The definition of "Leverage Ratio" is amended by deleting the
following "multiplied by the Annualization Factor".

     (d)  The definition of "Rolling Period" is amended by inserting, prior to
the period at the end thereof, the following:

          "; provided, however, that with respect to the calculation of EBITDA,
             --------  -------
     it shall mean the consecutive 12-month period ending on the last day of
     such fiscal month".

          SECTION 2.  Conditions of Effectiveness.  This Amendment shall become
                      ---------------------------
effective on and as of the first date (the "Effective Date") on which the Agent
shall have received, in form and substance satisfactory to the Agent and in
sufficient copies for each Lender Party, (1) counterparts of this Amendment
executed by the Borrower and the Required Lenders or, as to any of the Lenders,
advice satisfactory to the Agent that such Lender has executed this Amendment
and (2) the consent attached hereto executed by each party to the Subsidiary
Guaranty.

          SECTION 3.  Reference to and Effect on the Loan Documents.  (a)  On
                      ---------------------------------------------
and after the effectiveness of this Amendment, each reference in the Credit
Agreement to "this Agreement", "hereunder", "hereof" or words of like import
referring to the Credit Agreement, and each reference in the Notes and each of
the other Loan Documents to "the Credit Agreement", "thereunder", "thereof" or
words of like import referring to the Credit Agreement, shall mean and be a
reference to the Credit Agreement, as amended by this Amendment.

     (b)  The Credit Agreement and each of the other Loan Documents, as
specifically amended by this Amendment, are and shall continue to be in full
force and effect and are hereby in all respects ratified and confirmed.  Without
limiting the generality of the foregoing, the Collateral Documents and all of
the Collateral described therein do and shall continue to secure the payment of
all Obligations of the Loan Parties under the Loan Documents, in each case as
amended by this Amendment.
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                                       3

     (c)  The execution, delivery and effectiveness of this Amendment shall not,
except as expressly provided herein, operate as a waiver of any right, power or
remedy of any Lender or the Agent under any of the Loan Documents, nor
constitute a waiver of any provision of any of the Loan Documents.

          SECTION 4.  Costs, Expenses.  The Borrower agrees to pay on demand all
                      ---------------
costs and expenses of the Agent in connection with the preparation, execution,
delivery and administration, modification and amendment of this Amendment and
the other instruments and documents to be delivered hereunder (including,
without limitation, the reasonable fees and expenses of counsel for the Agent)
in accordance with the terms of Section 8.04 of the Credit Agreement.

          SECTION 5.  Execution in Counterparts.  This Amendment may be executed
                      -------------------------
in any number of counterparts and by different parties hereto in separate
counterparts, each of which when so executed shall be deemed to be an original
and all of which taken together shall constitute but one and the same agreement.
Delivery of an executed counterpart of a signature page to this Amendment by
telecopier shall be effective as delivery of a manually executed counterpart of
this Amendment.

          SECTION 6.  Governing Law.  This Amendment shall be governed by, and
                      -------------
construed in accordance with, the laws of the State of New York.

            [THE REMAINDER OF THIS PAGE IS INTENTIONALLY LEFT BLANK]
<PAGE>

          IN WITNESS WHEREOF, the parties hereto have caused this Amendment to
be executed by their respective officers thereunto duly authorized, as of the
date first above written.

                                        BMAC HOLDINGS, INC.,
                                        as Parent Guarantor

                                        By _____________________________________
                                           Name:
                                           Title:

                                        BETTER MINERALS & AGGREGATES
                                        COMPANY, as Borrower

                                        By: ____________________________________
                                            Name:
                                            Title:
<PAGE>

                                        BANQUE NATIONALE DE PARIS,
                                        as Agent, Initial Lender, Swing Line
                                        Bank and Initial Issuing Bank

                                        By: ____________________________________
                                            Name:
                                            Title:

                                        By: ____________________________________
                                            Name:
                                            Title:

                                        BANK AUSTRIA CREDITANSTALT
                                        CORPORATE FINANCE, INC.

                                        By: ____________________________________
                                            Name:
                                            Title:

                                        By: ____________________________________
                                            Name:
                                            Title:

                                        MERRILL LYNCH SENIOR FLOATING
                                        RATE FUND II, INC.

                                        By: ____________________________________
                                            Name:
                                            Title:
<PAGE>

                                        PRINCIPAL LIFE INSURANCE
                                        COMPANY
                                        By:  Principal Capital Management
                                        LLC, a Delaware limited liability
                                        company, its authorized signatory

                                        By: ____________________________________
                                            Name:
                                            Title:

                                        By: ____________________________________
                                            Name:
                                            Title:

                                        MORGAN STANLEY DEAN WITTER
                                        PRIME INCOME TRUST

                                        By: ____________________________________
                                            Name:
                                            Title:

                                        NATIONAL BANK OF CANADA

                                        By: ____________________________________
                                            Name:
                                            Title:

                                        By: ____________________________________
                                            Name:
                                            Title:

                                        FIRST SOURCE FINANCIAL LLP
                                        By:  First Source Financial, Inc.,
                                             its Agent/Manager

                                        By: ____________________________________
                                            Name:
                                            Title:
<PAGE>

                                        BOEING CAPITAL CORPORATION

                                        By: ____________________________________
                                            Name:
                                            Title:

                                        THE CHASE MANHATTAN BANK

                                        By: ____________________________________
                                            Name:
                                            Title:

                                        BANK POLSKA KASA OPIEKI S.A.
                                        NEW YORK BRANCH

                                        By: ____________________________________
                                            Name:
                                            Title:

                                        THE TRAVELERS INSURANCE COMPANY

                                        By: ____________________________________
                                            Name:
                                            Title:
<PAGE>

                                        TRAVELERS CORPORATE LOAN
                                        FUND INC.

                                        By:  Travelers Asset Management
                                             International Corporation

                                        ABN AMRO BANK N.V.

                                        By: ____________________________________
                                            Name:
                                            Title:

                                        By: ____________________________________
                                            Name:
                                            Title:

                                        HELLER FINANCIAL, INC.

                                        By: ____________________________________
                                            Name:
                                            Title:

                                        ARCHIMEDES FUNDING, L.L.C.,
                                        By:  ING Capital Advisors LLC
                                             as its Collateral Manager

                                        By: ____________________________________
                                            Name:
                                            Title:

                                        ARCHIMEDES FUNDING, II, LTD.
                                        By:  ING Capital Advisors LLC,
                                             as its Collateral Manager

                                        By: ____________________________________
                                            Name:
                                            Title:
<PAGE>

                                        KZH-ING-1 LLC

                                        By: ____________________________________
                                            Name:
                                            Title:

                                        KZH-ING-2 LLC

                                        By: ____________________________________
                                            Name:
                                            Title:

                                        BALANCED HIGH-YIELD FUND I
                                        LTD.
                                        By:   BHF (USA) Capital Corporation, as
                                        Attorney-In-Fact

                                        By: ____________________________________
                                            Name:
                                            Title:

                                        By: ____________________________________
                                            Name:
                                            Title:

                                        NATIONAL CITY BANK

                                        By: ____________________________________
                                            Name:
                                            Title:

                                        FIRST UNION NATIONAL BANK

                                        By: ____________________________________
                                            Name:
                                            Title:
<PAGE>

                                        METROPOLITAN LIFE INSURANCE
                                        COMPANY

                                        By: ____________________________________
                                            Name:
                                            Title:

                                        FRANKLIN FLOATING  RATE TRUST

                                        By: ____________________________________
                                            Name:
                                            Title:

                                        PPM SPYGLASS FUNDING TRUST

                                        By: ____________________________________
                                            Name:
                                            Title:
<PAGE>

                              SUBSIDIARY CONSENT

                                    Dated as of March _____, 2000

     The undersigned, as parties to one or more of the Loan Documents as defined
in the Credit Agreement referred to in the foregoing Amendment, hereby consent
to such Amendment and the Credit Agreement as amended on or prior to the date
hereof and hereby confirm and agree that (a) notwithstanding the effectiveness
of such Amendment, each of the Loan Documents is, and shall continue to be, in
full force and effect and is hereby ratified and confirmed in all respects,
except that, on and after the effectiveness of such Amendment, each reference in
the Loan Documents to the "Credit Agreement", "thereunder", "thereof" or words
of like import shall mean and be a reference to the Credit Agreement as amended
by such Amendment, and (b) the Collateral Documents to which such undersigned is
a party and all of the Collateral described therein do, and shall continue to,
secure the payment of all of the Secured Obligations (in each case, as defined
therein).

                                   PENNSYLVANIA GLASS SAND CORPORATION

                                   By: _________________________________________
                                       Title:

                                   THE FULTON LAND AND TIMBER COMPANY

                                   By: _________________________________________
                                       Title:

                                   OTTAWA SILICA COMPANY

                                   By: _________________________________________
                                       Title:

                                   GEORGE F. PETTINOS, INC.

                                   By: _________________________________________
                                       Title:
<PAGE>

                                   ELLEN JAY, INC.

                                   By: _________________________________________
                                       Title:

                                   U.S. SILICA COMPANY (a/k/a U.S. Silica
                                   Company, Inc.)

                                   By: _________________________________________
                                       Title:

                                   BETTER MATERIALS CORPORATION

                                   By: _________________________________________
                                       Title:

                                   BMC TRUCKING, INC.

                                   By: _________________________________________
                                       Title:

                                   BUCKS COUNTY CRUSHED STONE COMPANY

                                   By: _________________________________________
                                       Title:

                                   CHIPPEWA FARMS CORPORATION

                                   By: _________________________________________
                                       Title:

                                   SHORE STONE COMPANY, INC.

                                   By: _________________________________________
                                       Title:
<PAGE>

                                   COMMERCIAL STONE CO., INC.

                                   By: _________________________________________
                                       Title:

                                   STONE MATERIALS COMPANY, LLC

                                   By: Better Minerals & Aggregates Company,
                                       as Manager

                                   By: _________________________________________
                                       Title:

                                   COMMERCIAL AGGREGATES TRANSPORTATION
                                   AND SALES, LLC

                                   By: Stone Materials Company, LLC,
                                       as Manager

                                   By: _________________________________________
                                       Title:<PAGE>

                                                                 EXHIBIT 10.13.2

       Amendment No. 1 to the General Agreement for Purchase of Personal
                  Communications Systems and Services Between
               TeleCorp PCS, Inc., and Lucent Technologies Inc.

This is the first amendment ("Amendment No. 1") to the General Agreement for
Purchase of Personal Communications Systems and Services ("Agreement"), between
TeleCorp PCS, Inc., a Delaware corporation ("Customer") and Lucent Technologies
Inc. ("Seller" or "Lucent"), a Delaware corporation, Contract No.
LNM980501JATEL. Capitalized terms not defined herein shall have the same meaning
given to such terms in the Agreement.

WHEREAS Seller and Customer desire to amend the Agreement as stated in this
Amendment.

NOW, THEREFORE, in consideration of the mutual promises and covenants
hereinafter set forth and other good and valuable consideration, the receipt and
sufficiency of which is hereby acknowledged.

        A.  Scope of Amendment
        ----------------------
The Agreement is hereby amended to include the following terms and conditions:

        Customer agrees to purchase a license from Seller for, and Seller agrees
        to license and deliver to Customer and implement and support,
        application software for (i) ACTIVIEW(R) Wireless Service Feature
        Provisioning (WSP) order management system Licensed Materials and (ii)
        BILLDATS(R) Data Manager application Licensed Materials, pursuant to
        Attachment 1 - Pricing Summary, Attachment 2 - Statements of Work,
        Attachment 3 - Post Warranty Communications Software Support and the
        following terms and conditions.

        B.  Billing and Payment Terms
        -----------------------------
   (1)  For each of BILLDATS(R) and ACTIVIEW(R) Core RTU Licensed Materials,
        including Third Party Software and Custom Software packages, Customer
        shall be invoiced for the prices set forth on Attachment 1 as follows
        for the initial release (Year 0):
        (a)  85% of the license fee on delivery or as soon thereafter as
        practicable
        (b)  15% of the license fee on Final Acceptance

   (2)  For BILLDATS(R) and ACTIVIEW(R) Core RTU Licensed Materials, including
        Third Party Software and Custom Software packages, New Feature Pricing
        provided in subsequent releases (Years 1 through 5), Customer shall be
        invoiced for the prices set forth on Attachment 1 as follows:
        (a)  90% of the invoiced amount on January 1 of each respective calendar
        year during the term of this Amendment
        (b)  10% of the invoiced amount on Final Acceptance

<PAGE>

   (3)  For Software Maintenance, Customer shall be invoiced the annual fee in
        semi-annual installments on the first day of January and July of each
        year. For Support Services and Project Management fees, Customer shall
        be invoiced the entire annual fee on the first day of January, 1999.

   (4)  For all other charges and fees, Customer shall be invoiced either when
        they are delivered or the service is completed.

   (5)  On or before September 30, 1998, Customer issued and Seller accepted an
        order for $740,000 in ACTIVIEW(R) Core RTU Licensed Materials and
        hardware and Seller issued and Customer accepted an invoice for said
        amount. In consideration of Customer's purchasing the hardware directly,
        Seller hereby issues a credit to Customer in the sum of $190,000.

   (6)  The provisions of Section 1.12 shall apply to all invoices issued under
        this section 2.

        C. Warranty/Post-Warranty Software Support
        ------------------------------------------

        The warranty period for BILLDATS(R) and ACTIVIEW(R) Licensed Materials
        shall commence upon Final Acceptance and last for a period of twelve
        (12) months.

        Attachment 3 sets forth the post-warranty options available for software
        support for BILLDATS(R) and ACTIVIEW(R) to Customer. Customer has
        elected the Gold Uplift option and the pricing for this option is set
        forth in Attachment 1.

        Seller acknowledges that Customer in entering into this Agreement has
        relied on Seller's good will and trust. In this regard, Seller agrees
        during the term of this Agreement (i.e. Year 0 through Year 5) to
        continue to improve the Communications Software (i.e. ACTIVIEW(R) and
        BILLDATS(R)) to keep it consistent with state of the art technology and
        customer needs, including those of Customer.

        D. Third Party Responsibilities
        -------------------------------

        Seller shall not be responsible for any delay in performing its
        obligations, as specified in Attachment 2 - Statement of Work, if
        Customer or its other vendors or contractors fail to timely complete
        their obligations which are essential to Seller's performance.

        E. Remedies - Completion Delay
        ------------------------------

<PAGE>

        For the purpose of this amendment, the application of section 1.16(b) of
        the Agreement (entitled "Completion Delay") reading as "an amount equal
        to .35% (thirty-five hundredths of one percent) of the aggregate
        purchases ordered for such market" shall, as applied to delays relating
        to the Communications Software Licensed Materials (i.e. ACTIVIEW(R) and
        BILLDATS(R)), be construed to mean an amount equal to .35% (thirty-five
        hundredths of one percent) of the aggregate purchases of licenses for
        Communications Software Licensed Materials (i.e. ACTIVIEW(R) and
        BILLDATS(R)), as specified in Attachment 1 - Pricing Summary, and shall
        not include any other Products, or Services, ordered. For delays
        relating to any other Products, Licensed Materials or Services, Section
        1.16(b) of the Agreement shall remain in force and effect unchanged.

        F.  Miscellaneous
        -----------------

        (1)     Except as modified by this Amendment, all terms and conditions
            of the Agreement shall remain in effect and be fully applicable to
            this Amendment and the Licensed Materials and Services (i.e.,
            ACTIVIEW(R) and BILLDATS(R)) referred to herein.

        (2)     Deference shall be granted to this Amendment and to any
            documents attached hereto in the event of a conflict between this
            Amendment and the Agreement as it relates to the Licensed Materials
            and Services (i.e., ACTIVIEW(R) and BILLDATS(R)) referred to herein.

     IN WITNESS WHEREOF, the parties have caused this First Amendment to be
     executed by their duly authorized representatives on the date(s) indicated.

TeleCorp PCS, Inc.,                        Lucent Technologies Inc.

By: /s/ Thomas H. Sullivan                 By: /s/  Charles M. Many
    ---------------------------------          ---------------------------------

Title: Executive Vice President            Title: Vice President - Sales
       ------------------------------             ------------------------------

Date:  11/15/98                            Date:  11/20/98
      -------------------------------            -------------------------------

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