KFX INC
8-K, 1997-08-22
INDUSTRIAL ORGANIC CHEMICALS
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<PAGE>
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549



                                    FORM 8-K
                                 CURRENT REPORT



                     Pursuant to Section 13 or 15(d) of the
                        Securities Exchange Act of 1934



 

                                August 15, 1997
                       (Date of earliest event reported)



                                    KFx Inc.
             (Exact name of Registrant as specified in its charter)



      Delaware                      0-23634                  84-1079971
 (State of Incorporation)   (Commission File No.)          (IRS Employer
                                                        Identification No.)


 

             1999 Broadway, Suite 3200, Denver, Colorado USA  80202
          (Address of principal executive offices, including zip code)



 

                                 (303) 293-2992
              (Registrant's telephone number, including area code)

                                       1
<PAGE>
 
Item 7.     (c) Exhibits
                --------


            4.1      Form of 6% Convertible Debentures due 2002.


            4.2      Form of Warrant to Purchase Common Stock issued to the
                     Placement Agents.



Item 9.     Sales of Equity Securities Pursuant to Regulation S.
            ---------------------------------------------------

            On August 15, 1997 (the "Closing Date"), KFx Inc. (the "Company") 
completed the offer and sale of $17 million principal amount of the Company's 6%
convertible debentures due 2002 (the "Debentures"). The Debentures were sold
without registration under the Securities Act of 1933, as amended (the
"Securities Act") in reliance on the exemption from registration provided by
Regulation S under the Securities Act. The Debentures were offered, sold and
delivered only to non-United States persons outside of the United States, its
territories and possessions. Application has been made to list the Debentures on
the Luxembourg Stock Exchange.


            The placement agents of the Debentures' offering were BlueStone 
Capital Partners, L.P., and Jefferies International Limited (collectively, the
"Placement Agents"). The aggregate underwriting discounts and commissions paid
to the Placement Agents in conjunction with the sale of the Debentures was
$1,190,000 (7% of the principal amount thereof). The Company also issued to the
Placement Agents and/or their designees, warrants (the "Placement Agents'
Warrants") to purchase 453,333 shares of common stock, par value $.001 per
share, of the Company (the "Common Stock" or "Shares"). The exercise price of
the Placement Agents' Warrants will be $5.00 per share. Banca del Gottardo is
acting as Offering Representative for the Placement Agents, and as such will be
paid by the Placement Agents an as yet undetermined portion of the cash
compensation payable to the Placement Agents by the Company.


            The Debentures are convertible into Shares at the option of the 
holder of the Debentures (the "Holders"), in multiples of $10,000 principal
amount, at any time commencing on the 91st day after the Closing Date and prior
to maturity (unless previously redeemed or repurchased by the Company), into
that whole number of Shares determined by dividing (a) the principal amount of
Debentures to be converted by (b) the Conversion Price (as defined herein),
subject to adjustment in certain circumstances. No fractional Shares will be
issued as a result of conversion, but in lieu thereof such fractional interest
will be paid by the Company in cash. Accrued and unpaid interest on the
Debentures will be paid in cash at the time of conversion. Holders of Debentures
called for redemption will be entitled to convert the Debentures up to and
including, but not after, the date of redemption. The right to convert a
Debenture delivered for redemption or repurchase will terminate on the
redemption or repurchase date, as applicable.

                                       2
<PAGE>
 
            The initial Conversion Price is $3.75 per share and such price 
will be reset on November 1, 1999 (the "Reset Conversion Date"). On and after
the Reset Conversion Date, the Conversion Price will be the product obtained by
multiplying (i) the Stock Price Factor (as defined below), by (ii) 90%. However,
the Conversion Price may not be less than $3.65 (the "Floor"), other than as the
result of the operation of customary antidilution adjustments set forth in the
indenture entered into between the Company and First Bank National Association,
as trustee dated as of July 25, 1997; provided, however, notwithstanding the
foregoing, if the exercise price of the warrant issued to Thermo Ecotek
Corporation to purchase 7,750,000 shares of Common Stock is reduced, then the
Floor will be adjusted downward on a dollar-for-dollar basis.


            "Stock Price Factor" means the average American Stock Exchange 
("AMEX") closing sale price per Share (or, if the Company is listed or quoted on
a U.S. exchange other than AMEX, the average closing price on such exchange) for
the 15 trading days immediately preceding the Reset Conversion Date.


            The Company will, at the Company's expense, (i) file with the 
Securities and Exchange Commission within 45 days after the date of the final
closing, a registration statement (the "Shelf Registration Statement"), (ii) use
its reasonable best efforts to cause the Shelf Registration Statement to be
declared effective under the Securities Act as soon as possible thereafter, and
(iii) use its reasonable best efforts to keep the Shelf Registration Statement
effective until the last date on which the Debentures may be converted.

                                       3
<PAGE>
 
                                   SIGNATURES



      Pursuant to the requirements of the Securities Exchange Act of 1934, the
Registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized, on this 15th day of August, 1997.



                              KFx Inc.



                              By: /s/  Jeffrey A. Hansen
                                  ----------------------
                                  Jeffrey A. Hansen
                                  Chief Financial Officer

                                       4
<PAGE>
 
Exhibit Index
- -------------


     4.1      Form of 6% Convertible Debentures due 2002.

     4.2      Form of Warrant to Purchase Common Stock issued to the Placement
              Agents.

                                       5


<PAGE>
 
                                  EXHIBIT 4.1


                               [FORM OF FACE]


                                   KFx Inc.


                       6% CONVERTIBLE DEBENTURE DUE 2002


No. __________                                                U.S. $10,000
Debenture ISIN XS0078387601
Common Code 7838760


        KFx Inc., a corporation duly organized and existing under the laws of 
the State of Delaware (the "Company"), for value received, hereby promises to
pay to bearer, upon presentation and surrender of this Debenture, an amount
equal to 112% of the principal sum of Ten Thousand United States Dollars on the
date in the year 2002 which is five Business Days prior to the fifth anniversary
of the Initial Closing Date (the "Maturity Date") and to pay interest on such
principal sum, from the Initial Closing Date, or from the most recent Interest
Payment Date (as defined below) to which interest has been paid or duly provided
for, semi-annually in arrears on January 31 and July 31 in each year (an
"Interest Payment Date"), commencing January 31, 1998, at the rate of 6% per
annum, until the principal hereof and premium, if any, is due, and at the rate
of 8% per annum on any overdue principal and, to the extent permitted by law, on
any overdue interest. Such payments shall be made, subject to any laws or
regulations applicable thereto and to the right of the Company (limited as
provided in the Indenture) to terminate the appointment of any such Paying
Agent, at the option of the Holder, at the principal office of Banque
Internationale A Luxembourg, Luxembourg, or at such other offices or agencies
outside the United States (as defined below) as the Company may designate, at
the option of the Holder, by a United States Dollar check drawn on a bank in the
City of New York or by transfer of United States Dollars to an account
maintained by the Holder with a bank located outside the United States, provided
that such Holder shall have furnished wire transfer instructions in writing to
the Paying Agent by no later than five days prior to the relevant payment date.
Interest on this Debenture due on or before the Maturity Date shall be payable
only upon presentation and surrender at such an office or agency of the Coupons
hereto attached as they severally mature. No payment of principal of, premium,
if any, or interest on, including Additional Amounts (as defined below) with
respect to, this Debenture shall be made at the Corporate Trust Office of the
Trustee under the Indenture referred to on the reverse hereof or at any other
office or agency of the Company in the United States or by check mailed to any
address in the United States or by transfer to an account maintained with a bank
located in the United States; provided, however, that payment of principal of,
premium, if any, or interest on this Debenture and payment of any such
Additional Amounts may be made at an office of the Paying Agent in the United
States, if (but only if) payment of the full amount of such principal, premium,
if any, interest or Additional Amounts, as the case may be, at all offices
outside the United States maintained for such purpose by the Company in
accordance with the Indenture is illegal or effectively precluded by exchange
controls or other similar restrictions on the full payment or receipt of such
amounts in United States Dollars, as determined by the Company.

                                       1
<PAGE>
 
        Subject to the terms of the Indenture, the Company will pay to the 
Holder of this Debenture or any Coupon, who is not a "United States Person" such
additional amounts ("Additional Amounts") as may be necessary in order that
every net payment of the principal of, premium, if any, and interest on this
Debenture (including payment on redemption or repurchase), after deduction or
withholding for or on account of any present or future tax assessment or
governmental charge imposed upon or as a result of such payment by the United
States or any political subdivision or taxing authority thereof or therein, will
not be less than the amount provided for in this Debenture or in such Coupon to
be then due and payable; provided, however, that the foregoing obligation to pay
Additional Amounts will not apply to:


        (a)  any tax, assessment or other governmental charge which would not 
     have been so imposed but for (i) the existence of any present or former
     connection between such Holder (or between a fiduciary, settlor,
     beneficiary, member, shareholder of or possessor of a power over such
     Holder, if such Holder is an estate, a trust, a partnership or a
     corporation) and the United States or any political subdivision or taxing
     authority thereof or therein, including, without limitation, such Holder
     (or such fiduciary, settlor, beneficiary, member, shareholder or possessor)
     being or having been a citizen or resident of the United States or treated
     as a resident thereof, or being or having been engaged in trade or business
     or present therein, or having a permanent establishment therein, or (ii)
     such Holder's present or former status as a personal holding company, a
     foreign personal holding company with respect to the United States, a
     controlled foreign corporation or a passive foreign investment company for
     United States tax purposes or a corporation which accumulates earnings to
     avoid United States federal income tax;


        (b)  any tax, assessment or other governmental charge which would not 
     have been so imposed but for the presentation by the Holder of this
     Debenture or any Coupon for payment on a date more than 15 days after the
     date on which such payment became due and payable or the date on which
     payment thereof is duly provided for, whichever occurs later;


        (c)  any estate, inheritance, gift, sales, transfer,  personal property
     or similar tax, assessment or governmental charge;


        (d)  any tax, assessment or other governmental charge which would not 
     have been imposed but for the failure to comply with any certification,
     identification or other reporting requirements concerning the nationality,
     residence, identity or connection with the United States of the Holder or
     beneficial owner of this Debenture or any Coupon appertaining hereto, if
     compliance is required by statute or by regulation of the United States
     Treasury Department as a precondition to exemption from such tax,
     assessment or other governmental charge;


        (e)  any tax, assessment or other governmental charge which is payable 
     otherwise than by deduction or withholding from payments of principal of or
     interest on this Debenture;

                                       2
<PAGE>
 
        (f)  any tax, assessment or other governmental charge imposed as a 
     result of a Person's past or present actual or constructive ownership,
     including by virtue of the right to convert Debentures, of 10% or more of
     the total combined voting power of all classes of stock of the Company
     entitled to vote;


        (g)  any tax, assessment or other governmental charge required to be 
     withheld by any Paying Agent from any payment of the principal of or
     interest on this Debenture, if such payment can be made without such
     withholding by any other Paying Agent in Western Europe;


        (h)  any tax, assessment or other governmental charge imposed on a 
     Holder that is not the sole beneficial owner of this Debenture or that is a
     partnership or a fiduciary, but only to the extent that any beneficial
     owner or member of the partnership or beneficiary or settlor with respect
     to the fiduciary would not have been entitled to the payment of Additional
     Amounts had the beneficial owner or member directly received its beneficial
     or distributive share of payments on this Debenture; or


        (i)  any combination of items (a), (b), (c), (d), (e), (f), (g) and (h).



        Notwithstanding the foregoing, if and so long as a certification, 
identification or other information reporting requirement referred to in the
fourth paragraph of the reverse hereof would be fully satisfied by payment of a
backup withholding tax or similar charge, the Company may elect, by so stating
in the Determination Notice (as defined on the reverse hereof), to have the
provisions of this paragraph apply in lieu of the provisions of such paragraph.
In such event, the Company will pay, as Additional Amounts, such amounts as may
be necessary so that every net payment made, following the effective date of
such requirements, outside the United States by the Company or any Paying Agent
of principal due in respect of this Debenture, or interest represented by any
Coupon, to the beneficial owner of which is not a United States Person (but
without any requirement that the nationality, residence or identity of such
beneficial owner be disclosed to the Company, any Paying Agent or any
governmental authority), after deduction or withholding for or on account of
such backup withholding tax or similar charge, other than a backup withholding
tax or similar charge which is (a) the result of a certification, identification
or information reporting requirement described in the first parenthetical clause
of such paragraph, (b) imposed as a result of the fact that the Company or any
Paying Agent has actual knowledge that the beneficial owner of this Debenture or
such Coupon is within the category of Persons described in clause (a) of the
immediately preceding paragraph, or (c) imposed as a result of presentation of
this Debenture or such Coupon for payment more than 15 days after the date on
which such payment becomes due and payable or on which payment thereof is duly
provided for, whichever occurs later, will not be less than the amount provided
for in this Debenture or such Coupon to be then due and payable.


        Except as specifically provided herein and in the Indenture, the 
Company shall not be required to make any payment with respect to any tax,
assessment or other governmental charge imposed by any government or any
political subdivision or taxing authority thereof or therein. Whenever in this
Debenture there is a reference, in any context, to the payment of the principal,
if any, of, premium, if any, or interest on, or in respect of, any Debenture or
any 

                                       3
<PAGE>
 
Coupon, such reference shall be deemed to include the payment of Additional
Amounts payable pursuant to the first and second preceding paragraphs to the
extent that, in such context, Additional Amounts are, were or would be payable
in respect of this Debenture pursuant to such paragraphs, and express reference
to the payment of Additional Amounts (if applicable) in any provisions of this
Debenture shall not be construed as excluding Additional Amounts in those
provisions of this Debenture where such express reference is not made.


        Reference is hereby made to the further provisions of this Debenture 
set forth on the reverse hereof, which further provisions shall for all purposes
have the same effect as if set forth on the face hereof.


        Unless the certificate of authentication hereon has been executed by 
the Trustee referred to on the reverse hereof or its Authenticating Agent by the
manual signature of one of its authorized signatories, neither this Debenture,
nor any Coupon appertaining hereto, shall be entitled to any benefit under the
Indenture or be valid or obligatory for any purpose.


        IN WITNESS WHEREOF, the Company has caused this Debenture to be duly 
executed under its corporate seal and Coupons bearing the facsimile signature of
one of its Officers to be annexed hereto.


Dated as of _________, ____


[Corporate Seal]                               KFx Inc.


                                               By: _______________________
                                                   Title:

Attest:

_______________________
Title:

                                       4
<PAGE>
 
                               [FORM OF REVERSE]


                                   KFx Inc.



                      6% CONVERTIBLE DEBENTURES DUE 2002



        This Debenture is one of a duly authorized issue of debentures of the 
Company designated as its "6% Convertible Debentures due 2002" (the
"Debentures"), limited in aggregate principal amount to U.S. $25,000,000 issued
and to be issued under an Indenture, dated as of July 25, 1997 (the
"Indenture"), between the Company and First Bank National Association, doing
business as Colorado National Bank, as Trustee (the "Trustee"), to which
Indenture and all indentures supplemental thereto reference is hereby made for a
statement of the respective rights, limitations of rights, duties and immunities
thereunder of the Company, the Trustee and the Holders of the Debentures and any
Coupons appertaining thereto and of the terms upon which the Debentures are, and
are to be, authenticated and delivered.


        No sinking fund is provided for the Debentures.  The Debentures are 
subject to redemption, at the option of the Company, as a whole or in part from
time to time, at any time after the second anniversary of the Initial Closing
Date, at a Redemption Price equal to 130% of the principal amount plus accrued
interest to the Redemption Date, and Debentures held by United States Aliens are
also redeemable as a whole, but not in part, under the circumstances described
in the next two succeeding paragraphs, at a Redemption Price equal to 100% of
the principal amount plus interest accrued to the Redemption Date; provided,
however, that interest installments on Debentures maturing on an Interest
Payment Date on or prior to such Redemption Date will be payable only upon
presentation and surrender of Coupons for such interest at an office or agency
outside the United States (except as herein provided otherwise).


        If as a result of a Tax Law Change, the Company has or will become 
obligated to pay to the Holder of any Debenture or Coupon Additional Amounts, as
described in the second paragraph of the face of this Debenture, and such
obligation cannot be avoided by the Company taking reasonable measures available
to it, then the Company may, at its option, redeem the Debentures as a whole,
but not in part, at a Redemption Price equal to 100% of the principal amount
plus interest accrued to the Redemption Date, but without reduction for any
applicable United States withholding taxes; provided, however, that (i) no such
notice of redemption shall be given earlier than 90 days prior to the earliest
date on which the Company would be obligated to pay any such Additional Amounts
were a payment in respect of the Debentures then due and (ii) at the time such
notice of redemption is given, such obligation to pay such Additional Amounts
remains in effect. Prior to the publication of any notice of redemption pursuant
to this paragraph, the Company shall deliver to the Trustee (a) an Officers'
Certificate stating that the Company is entitled to effect such redemption and
setting forth a statement of facts showing that the conditions precedent to the
right of the Company so to redeem have occurred and (b) an Opinion of Counsel
selected by the Company to the effect that the Company has or will become
obligated to pay such Additional Amounts as a result of such Tax Law Change. The
Company's right to redeem the Debentures shall continue as long as the Company
is obligated to pay such Additional Amounts, notwithstanding that the Company
shall have made payments of Additional Amounts specified in such second
paragraph.

                                       5
<PAGE>
 
        In addition, if the Company determines, based upon an Opinion of Counsel
selected by the Company, that as a result of a Tax Law Change, any payment made
outside the United States by the Company or any of its Paying Agents of the full
amount of principal, premium, if any, or interest due with respect to any
Definitive Debenture or Coupon would be subject to any certification,
identification or other information reporting requirement of any kind, the
effect of which requirement is the disclosure by the Company, any Paying Agent
or any governmental authority of the nationality, residence or identity of a
beneficial owner of such Definitive Debenture or Coupon who is a United States
Alien (other than such a requirement (a) which would not be applicable to a
payment made by the Company or any one of its Paying Agents (i) directly to the
beneficial owner or (ii) to any custodian, nominee or other agent of the
beneficial owner, (b) which can be satisfied by the custodian, nominee or other
agent certifying that such beneficial owner is not a United States Person,
provided, that, in each case referred to in clauses (a)(ii) and (b), payment by
such custodian, nominee or agent to such beneficial owner is not otherwise
subject to any such requirement, with respect to the beneficial owner of such
Definitive Debenture), the Company, at its election, will either (x) redeem the
Definitive Debentures, as a whole but not in part, upon not less than 30 nor
more than 60 days' notice prior to the Redemption Date, at a Redemption Price
equal to 100% of the principal amount plus interest accrued to the Redemption
Date, or (y) if and so long as the conditions of the fourth paragraph on the
face hereof are satisfied, pay the Additional Amounts specified in such
paragraph.


        The Company will make such determination and election and notify the 
Trustee and the Paying Agent thereof in writing as soon as practicable, and the
Paying Agent will promptly give notice of such determination in the manner
provided in the following paragraph (the "Determination Notice"), in each case
stating the effective date of such certification, identification or information
reporting requirement, whether the Company will redeem the Debentures or will
pay the Additional Amounts specified in the third paragraph on the face hereof
and (if applicable) the last date by which the redemption of the Debenture must
take place. If the Company elects to redeem the Debentures, such redemption
shall take place on a date, not later than one year after the publication of the
Determination Notice, as the Company elects by notice in writing to the Trustee
and the Paying Agent at least 45 days before the Redemption Date, unless shorter
notice is acceptable to the Trustee. Notwithstanding the foregoing, the Company
will not so redeem the Debentures if the Company, based upon an Opinion of
Counsel selected by the Company subsequently determines, not less than 30 days
prior to the Redemption Date, that subsequent payments would not be subject to
any such requirement, in which case the Company will notify the Trustee in
writing, and the Paying Agent will promptly give notice to the Holders of the
Debentures of that determination and any earlier redemption notice will
thereupon be revoked and of no further effect. If the Company elects as provided
in clause (y) of the immediately preceding paragraph to pay Additional Amounts,
the Company may, as long as the Company is obligated to pay such Additional
Amounts, subsequently redeem the Debentures, at any time, as a whole but not in
part, upon not less than 30 nor more than 60 days' notice prior to the
Redemption Date, at a Redemption Price equal to 100% of the principal amount
plus interest accrued to the Redemption Date, but without reduction for
applicable United States withholding taxes with respect to which the Company is
obligated to pay Additional Amounts.

                                       6
<PAGE>
 
        Notice of redemption will be given by publication in Authorized 
Newspapers in the City of London, England, and, so long as the Debentures are
listed on the Luxembourg Stock Exchange and the rules of such stock exchange
shall so require, in Luxembourg, or, if not practicable in either London,
England, or Luxembourg, elsewhere in any country in Western Europe. Notice to
the Holders will be given at least once not more than 60 nor less than 30 days
prior to the Redemption Date as provided in the Indenture.


        If proper notice of redemption shall have been given, and if the 
Company shall have deposited with the Trustee or with any Paying Agent (other
than the Company), for the benefit of the Holders of any of the Debentures
called for redemption in whole or in part, funds (to be immediately available
for payment) sufficient to redeem the Debentures to be redeemed on the date
fixed for redemption, at the applicable Redemption Price, together with accrued
and unpaid interest to the date fixed for redemption, then all obligations of
the Company in respect of such Debentures shall cease and be discharged (except
the obligation to issue Conversion Shares (as defined below) upon conversion of
Debentures on or prior to the applicable Redemption Date in accordance with the
terms of this Indenture and the Debentures), and the Holders of such Debentures
shall thereafter be restricted exclusively to such funds for any and all claims
of whatever nature on their part under the Indenture, or in respect of such
Debentures (except with respect to any rights of conversion as above stated).


        The Debentures may be converted by Holders thereof, from time to time,
in the minimum principal amount of $10,000 and integral multiples thereof,
commencing 91 days after the Initial Closing Date and on or before the close of
business on the Maturity Date (unless previously redeemed or repurchased), on
written notice to the Company, at the Conversion Price described below (except
that, in respect of any Debenture or Debentures, or portion thereof, called for
redemption before such date or if a Holder thereof has exercised its right to
require the Company to repurchase its Debenture or portion thereof pursuant to
the Indenture, such right shall terminate at the close of business on the
applicable Redemption Date or the Repurchase Date, as the case may be, unless
the Company shall default in making payment due upon redemption or repurchase)
thereof, subject to the terms and provisions of the Indenture, into (a) a whole
number of duly authorized, validly issued, fully paid and non-assessable shares
of Common Stock (the "Conversion Shares") determined by dividing (i) the
aggregate principal amount of the Debentures to be converted by (ii) the
Conversion Price, and (b) an amount of money equal to the value of the
fractional share remainder, if any, resulting from the calculation described in
clause (a) above, to be paid in U.S. dollars based on the Conversion Price per
share.


        "Conversion Price" means, prior to the Reset Conversion Date, $3.75 per 
share and on and after the Reset Conversion Date, the product of multiplying (x)
the applicable Stock Price Factor, by (y) 90%, provided, however, in no event
will the Conversion Price be less than U.S. $3.65 (the "Floor"), other than as a
result of the operation of the anti-dilution provisions of the Indenture,
regardless of the actual Stock Price Factor; and provided, further, that,
notwithstanding the foregoing, if the exercise price of Warrant A is reduced,
the Floor will be reduced on a dollar-for-dollar basis.


        "Stock Price Factor" means the average daily Closing Price Per Share 
for the 15 Trading Days immediately preceding the Reset Conversion Date. The
Reset Conversion Date is 

                                       7
<PAGE>
 
November 1, 1999.


        Debentures may be surrendered for conversion, subject to any applicable 
laws and regulations, at the office of the Conversion Agent outside the United
States. Debentures surrendered for conversion must be accompanied by a duly
executed Conversion Notice and all Coupons that mature after the Conversion
Date. Fractional Shares will not be issued upon conversion; in lieu thereof, the
remainder resulting from the conversion calculation shall be paid in cash in
U.S. dollars, based on the Conversion Price per share of Common Stock. Upon the
conversion of a Debenture, the Company will pay the converting Holder cash (in
U.S. dollars) equal to any accrued and unpaid interest on the Debentures at the
time of conversion. Subject to the operation of the adjustment provisions
described below and specified in the Indenture, no payment or adjustment shall
be made for dividends, if any, on shares of Common Stock issued upon conversion
(unless the record date therefor is subsequent to the date of conversion). In
the case of Debentures called for redemption, conversion rights will expire on
the close of business on the Redemption Date.


        The Conversion Price shall be subject to adjustment upon the occurrence 
of certain enumerated events, including (a) the subdivision or combination of
shares, the payment of a share dividend or distribution or any reclassification
or capital reorganization of the Common Stock; or (b) the consolidation or
merger of the Company with or into any other corporation, or sale or transfer of
all or substantially all of the assets of the Company, (c) the distribution to
holders of shares of Common Stock of evidence of Indebtedness or assets (other
than regularly scheduled cash dividends); and (d) the sale of shares of Common
Stock (or Convertible Securities) at a price per share less than the then
current Conversion Price, subject to certain exceptions. No adjustment of the
Conversion Price is required to be made until the cumulative adjustments
otherwise required to be made amount to 1% of the Conversion Price as last
adjusted.


        The Indenture contains covenants restricting the ability of the 
Company, subject to certain exceptions and qualifications, to incur additional
indebtedness, pay dividends or make distributions in respect of its capital
stock or purchase its capital stock; create Liens; enter into transactions with
affiliates; or consolidate, merge or sell all or substantially all of its
assets.


        In case an Event of Default, as defined in the Indenture, shall have 
occurred and be continuing, the principal of all of the Debentures may be
declared, and upon such declaration shall become, due and payable, in the
manner, with the effect and subject to the conditions provided in the Indenture,
by either the Trustee or the Holders of at least a 51% in aggregate principal
amount of the Outstanding Debentures.


        The Holders of a majority in aggregate principal amount of Outstanding
Debentures, subject to the provisions of the Indenture relating to the duties
and rights of the Trustee, will have the right to direct the time, method and
place of conducting any proceeding for any remedy available to the Trustee or
the exercising of any trust or power conferred on the Trustee.  However, the
Trustee will have the right to decline to follow any such direction, if the
Trustee determines that the action requested may not be lawfully taken, would
subject the Trustee to liability, or would be unduly prejudicial to the other
Holders.  As a prerequisite to taking any such action, the Trustee may require
the Holders requesting the same to provide it with 

                                       8
<PAGE>
 
reasonable security or indemnity against the cost, expenses and liabilities
which may be incurred in connection with such action. The Holders of at least
25% in aggregate principal amount of Outstanding Debentures may call a meeting
of Holders if the Trustee fails to do so within 10 days after receiving a
request that it call such a meeting.


        Title to the Debentures and to the Coupons appertaining thereto will 
pass by delivery. The Company, any Paying Agent or Conversion Agent and the
Trustee may (to the fullest extent permitted by applicable laws) deem and treat
the Holder of any Debenture and the Holder of any Coupon as the absolute owner
thereof for all purposes (whether or not the Debenture or a Coupon shall be
overdue and, to the extent permitted by applicable law, notwithstanding any
notice of ownership or writing on the Debenture or Coupon or any notice of
previous loss or theft of the Debenture or Coupon).


        With the consent of the Holders (or persons entitled to vote, or to give
consents respecting the same) of not less than a majority in aggregate principal
amount of the Outstanding Debentures, the Company, when authorized by a Board
Resolution, and the Trustee may, from time to time and at any time, enter into a
supplemental indenture for the purpose of adding any provisions to or changing
in any manner or eliminating any of the provisions of the Indenture or of any
supplemental indenture or of modifying in any manner the rights and obligations
of the Holders of the Debentures, Coupons and of the Company; provided that,
without the consent of the Holders of all Outstanding Debentures, no such
supplemental indenture shall, among other things, (a) extend the fixed maturity
of any Debenture, or reduce the principal amount thereof, or reduce the rate or
extend the time of payment of interest thereon, or reduce any premium payable at
maturity or upon redemption thereof, or (b) modify any of the provisions of this
Indenture with respect to conversion of the Debentures in a manner adverse to
the Holders thereof, or reduce the aforesaid percentage of Debentures, the
Holders of which are required to consent to any such supplemental indenture.


        The Company may not enter into any amendment of this Indenture without 
the prior written consent of TCK, as long as (i) TCK owns at least 1,000,000
Shares, and (ii) either of Warrant A or Warrant B remains in effect.


        Except for liabilities arising under the Securities Act, no recourse 
shall be had for the payment of the principal of, premium, if any, or interest
on any Debenture, or for any claim based thereon or otherwise in respect
thereof, and no recourse under or upon any obligation, covenant or agreement of
the Company in the Indenture or in any supplemental indenture, or in any
Debenture or Coupon or because of the creation of any indebtedness represented
hereby shall be had against any incorporator, stockholder, officer, trustee,
director, past, present or future, as such of the Company or of any predecessor
or successor corporation, whether by virtue of any constitution, statute or rule
of law or equity, or by the enforcement of any assessment or penalty or
otherwise; it being expressly understood that all such liability is hereby
expressly waived and released as a condition of, and as a consideration for, the
execution of the Indenture and the issue of the Debentures and Coupons.


        In the event of a Change of Control, each Holder shall have the right,
during the 45-day period following receipt of notice of such occurrence, to
require the Company to 

                                       9
<PAGE>
 
repurchase all or a portion of such Holder's Debentures at a cash purchase price
equal to the principal amount plus accrued interest to the Repurchase Date.


        A "Change of Control" shall be deemed to have occurred at the time when
a person or "group" [as defined in Section 13(d)(3) of the Exchange Act, as in
effect on the date hereof] (other than the Existing Control Group) shall have
become the beneficial owner (within the meaning of Rule 13d-3 under the Exchange
Act) of more than 50% of the aggregate Voting Stock of the Company, unless such
acquisition shall have been approved by a two-thirds (66 2/3%) majority of the
Continuing Directors of the Company.


        The Indenture, each Debenture and each Coupon appertaining thereto 
shall be deemed to be a contract made under the laws of the State of New York,
United States of America, and for all purposes shall be governed by and
construed in accordance with the internal substantive laws of such State,
without giving effect to the choice of law rules of such State.


        No reference herein to the Indenture and no provisions of this 
Debenture or of the Indenture shall alter or impair the obligation of the
Company, which is absolute and unconditional, to pay the principal of, premium,
if any, and interest on this Debenture at the time and place and at the rate and
in the manner herein prescribed.


        All terms used in this Debenture which are defined in the Indenture 
have the meanings assigned to them in the Indenture.

                                       10
<PAGE>
 
                   ELECTION OF HOLDER TO REQUIRE REPURCHASE


      1.       Pursuant to Section XV of the Indenture, the undersigned hereby
elects to have this Debenture (or if less than the full principal amount hereof,
the principal amount set forth below) repurchased by the Company.



      2.       The undersigned hereby directs the Trustee or Paying Agent to pay
to bearer an amount in cash equal to 100% of the principal amount hereof plus
interest accrued to the Repurchase Date.



Dated: ________________                 ___________________________
                                        Signature


                                        ___________________________
                                        Signature Guaranteed

Principal amount to be repurchased: * $_______________________

Remaining principal amount following such repurchase:


_________
*  Repurchasable in the minimum principal amount of $10,000 and integral
   multiples thereof.

                                       11
<PAGE>
 
      "THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE BEEN ISSUED PURSUANT
      TO REGULATION S, AN EXEMPTION FROM REGISTRATION PURSUANT TO THE PROVISIONS
      UNDER THE UNITED STATES SECURITIES ACT OF 1933, AS AMENDED (THE
      "SECURITIES ACT"). THE SECURITIES EVIDENCED HEREBY HAVE NOT BEEN
      REGISTERED UNDER THE SECURITIES ACT OR THE SECURITIES LAWS OF ANY STATE.
      THESE SECURITIES MAY NOT BE TRANSFERRED, OFFERED OR SOLD PRIOR TO THE END
      OF THE FORTY (40)-DAY PERIOD (THE "RESTRICTED PERIOD") COMMENCING ON THE
      LATER OF (i) THE DATE THE SECURITIES ARE FIRST OFFERED TO PERSONS OTHER
      THAN DISTRIBUTORS (AS DEFINED IN REGULATION S) OR (ii) THE DATE OF THE
      FINAL CLOSING OF THE OFFERING OF THE DEBENTURES BY THE COMPANY, UNLESS
      SUCH TRANSFER, OFFER OR SALE (i) IS MADE IN AN "OFFSHORE TRANSACTION" AND
      NOT TO A "U.S. PERSON" (OTHER THAN A "DISTRIBUTOR") (AS SUCH TERMS ARE
      DEFINED IN REGULATION S) OR (ii) IS MADE PURSUANT TO REGISTRATION OR AN
      APPLICABLE EXEMPTION UNDER THE SECURITIES ACT. THE SECURITIES REPRESENTED
      BY THIS CERTIFICATE CANNOT BE SOLD EXCEPT PURSUANT TO THE TERMS AND
      CONDITIONS OF THE DEBENTURE SUBSCRIPTION AGREEMENT BETWEEN THE COMPANY AND
      THE INITIAL HOLDER OF THE SECURITIES REPRESENTED BY THIS CERTIFICATE, A
      COPY OF WHICH IS ON FILE AT THE OFFICES OF THE COMPANY."


      "BY REQUESTING THE TRANSFER OF THE SECURITIES REPRESENTED BY THIS
      CERTIFICATE AFTER THE RESTRICTED PERIOD, THE HOLDER OF THIS CERTIFICATE
      REPRESENTS THAT IF SUCH TRANSFER IS MADE TO A U.S. PERSON, THAT AT THE
      TIME OF SUCH TRANSFER THE HOLDER IS NOT AN "AFFILIATE" OF THE COMPANY (AS
      SUCH TERM IS DEFINED IN THE SECURITIES ACT) OR AN "UNDERWRITER" OR
      "DEALER" (AS SUCH TERMS ARE DEFINED IN THE ACT), HAS NOT ENGAGED IN ANY
      SHORT SALES OR SIMILAR HEDGE TRANSACTIONS WITH RESPECT TO THE COMPANY'S
      SHARES OF COMMON STOCK DURING THE RESTRICTED PERIOD, IS NOT A
      "DISTRIBUTOR" AND SUCH TRANSFER IS NOT BEING MADE AS PART OF A PLAN OR
      SCHEME TO EVADE THE REGISTRATION PROVISIONS OF THE SECURITIES ACT."


      "ANY UNITED STATES PERSON WHO HOLDS THIS OBLIGATION WILL BE SUBJECT TO
      LIMITATIONS UNDER THE UNITED STATES INCOME TAX LAWS, INCLUDING THE
      LIMITATIONS PROVIDED IN SECTIONS 165(j) and 1287(a) OF THE INTERNAL
      REVENUE CODE OF 1986, AS AMENDED."

                                       12

<PAGE>
 
                                  EXHIBIT 4.2



        WARRANT AGREEMENT dated as of _________ __, 1997 between KFx Inc., a 
Delaware corporation (the "Company"), BlueStone Capital Partners, L.P. and 
Jefferies International Ltd. (the "Placement Agents").

                                 W I T N E S S E T H:
                                 -------------------

        WHEREAS, the Placement Agents have agreed, pursuant to the agreement 
(the "Placement Agency Agreement") dated July 25, 1997 by and among the 
Placement Agents and the Company, to act, on a "best efforts" basis, as
placement agents in connection with the Company's sale (the "Offering") to
persons who are not "U.S. persons," as that term is defined in Rule 902
promulgated under the Securities Act of 1933, as amended (the "Act"), of up to
an aggregate of $25,000,000 principal amount of the Company's 6% Convertible
Debentures due 2002 (the "Debentures");

        WHEREAS, the Company proposes to issue to the Placement Agents warrants
(the "Warrants") to purchase a number of shares of Common Stock (the "Shares"),
par value $.001 per share (the "Common Stock"), equal to 10% of the number of
shares of the Common Stock into which the aggregate principal amount of
Debentures sold in the Offering shall initially be convertible, based upon the
initial Holder Conversion Price, as defined in the indenture governing the
Debentures dated as of July 25, 1997 between the Company and First Bank National
Association, doing business as Colorado National Bank, as Trustee (the
"Indenture"); and

                                       1
<PAGE>
 

        WHEREAS, the Warrants issued pursuant to this Agreement are being 
issued by the Company to the Placement Agents and/or their designees, in
consideration for, and as part of the Placement Agents' compensation in
connection with, the Placement Agents acting as the Placement Agents pursuant to
the Placement Agency Agreement;

        NOW, THEREFORE, in consideration of the premises, the agreements herein
set forth and other good and valuable consideration, the receipt and sufficiency
of which are hereby acknowledged, the parties hereto agree as follows:

                                       2
<PAGE>
 
        1.  Grant.  The Placement Agents, and/or their designees, are hereby
            ----- 
granted the right to purchase, at any time beginning six months from the date
hereof and ending at 5:00 P.M., New York time, on the fifth anniversary of the
date hereof (the "Warrant Exercise Term"), up to a number of Shares equal to 10%
of the number of shares of Common Stock into which the aggregate principal
amount of Debentures sold in the Offering shall initially be convertible (based
upon the initial Conversion Price, as defined in the Indenture), at an initial
exercise price of $5.00 per Share (subject to adjustment as provided in Article
6 hereof).


        2.  Warrant Certificates.  The warrant certificates (the "Warrant
            -------------------- 
Certificates") delivered and to be delivered pursuant to this Agreement shall be
in the form set forth in Exhibit A attached hereto and made a part hereof, with
such appropriate insertions, omissions, substitutions and other variations as
required or permitted by this Agreement.  Within five (5) business days of the
earlier of the final closing of the Offering or the termination of the Offering,
the Company shall issue to the Placement Agents and/or their designees Warrant
Certificates (in substitution of the Warrant Certificates delivered on the
initial closing date of the Offering) substantially in the form set forth in
Exhibit A attached hereto and made a part hereof, which Warrant Certificates
shall designate fixed number(s) of shares of Common Stock, which, in the
aggregate shall be determined in accordance with Section 1 above.

        3.  Exercise of Warrant.
            -------------------

            3.1.  Cash Exercise.  The Warrants initially are exercisable at a
                  -------------
price of $5.00 per Share, payable in cash or by check to the order of the
Company, or any combination of

                                       3
<PAGE>
 
cash or check, subject to adjustment as provided in Section 8 hereof. Upon
surrender of the Warrant Certificate with the annexed Form of Election to
Purchase duly executed, together with payment of the Exercise Price (as
hereinafter defined) for the Shares purchased, at the Company's principal
executive offices in Denver, Colorado (currently located at 1999 Broadway, Suite
3200, Denver, Colorado 80202) the registered holder of a Warrant Certificate
("Holder" or "Holders") shall be entitled to receive after clearance of the
funds representing the Exercise Price a certificate or certificates for the
Shares so purchased. The purchase rights represented by each Warrant Certificate
are exercisable at the option of the Holder thereof, in whole or in part (but
not as to fractional Shares). In the case of the purchase of less than all the
Shares purchasable under any Warrant Certificate, the Company shall cancel said
Warrant Certificate upon the surrender thereof and shall execute and deliver a
new Warrant Certificate of like tenor for the balance of the Shares purchasable
thereunder.

            3.2.  Cashless Exercise.  At any time during the Warrant Exercise
                  -----------------
Term, the Holder may, at its option, exchange this Warrant, in whole or in part
(a "Warrant Exchange"), into the number of shares of Common Stock determined in
accordance with this Section 3.2, by surrendering this Warrant at the principal
office of the Company or at the office of its transfer agent, accompanied by a
notice stating such Holder's intent to effect such exchange, the number of
Shares to be exchanged and the date on which the Holder requests that such
Warrant Exchange occur (the "Notice of Exchange"). The Warrant Exchange shall
take place on the date specified in the Notice of Exchange or, if later, the
date the Notice of Exchange is received by the

                                       4
<PAGE>
 
Company (the "Exchange Date"). Certificates for the Shares issuable upon such
Warrant Exchange and, if applicable, a new warrant of like tenor evidencing the
balance of the Shares remaining subject to this Warrant, shall be issued as of
the Exchange Date and delivered to the Holder within three (3) days following
the Exchange Date. In connection with any Warrant Exchange, this Warrant shall
represent the right to subscribe for and acquire (i) the number of shares of
Common Stock (rounded to the next highest integer) which would, but for such
Warrant Exchange, then be issuable pursuant to the provisions of Section 3.1
above upon the exercise of the Warrants specified by the Holder in its Notice of
Exchange (the "Total Share Number") less (ii) the number of Shares equal to the
quotient obtained by dividing (a) the product of the Total Share Number and the
existing Exercise Price (as hereinafter defined) by (b) the Market Price of a
share of Common Stock on the day preceding the Warrant Exchange. "Market Price"
at any date shall be deemed to be the last reported sale price, or, in the case
no such reported sales takes place on such day, the average of the last reported
sale prices for the last three (3) trading days, in either case as officially
reported by the principal securities exchange on which the Common Stock is
listed or admitted to trading, or as reported in the NASDAQ National Market
System, or, if the Common Stock is not listed or admitted to trading on any
national securities exchange or quoted on the NASDAQ National Market System, the
closing bid price as furnished by (i) the National Association of Securities
Dealers, Inc. through NASDAQ or (ii) a similar organization if NASDAQ is no
longer reporting such information.

                                       5
<PAGE>

       4.  Issuance of Certificates.
           ------------------------
 
           Upon the exercise of the Warrants, the issuance of certificates for
the Shares purchased shall be made forthwith (and in any event within three
business days thereafter) without charge to the Holder thereof including,
without limitation, any tax which may be payable in respect of the issuance
thereof (other than income and similar taxes which may become payable by the
Holder), and such certificates shall (subject to the provisions of Article 5
hereof) be issued in the name of, or in such names as may be directed by, the
Holder thereof; provided, however, that the Company shall not be required to pay
any tax which may be payable in respect of any transfer involved in the issuance
and delivery of any such certificates in a name other than that of the Holder,
and the Company shall not be required to issue or deliver such certificates
unless or until the person or persons requesting the issuance thereof shall have
paid to the Company the amount of such tax or shall have established to the
satisfaction of the Company that such tax has been paid.

           The Warrant Certificates and the certificates representing the 
Shares shall be executed on behalf of the Company by the manual or facsimile
signature of the present or any future Chairman or Vice Chairman of the Board of
Directors or President or Vice President of the Company under its corporate seal
reproduced thereon, attested to by the manual or facsimile signature of the
present or any future Secretary or Assistant Secretary of the Company. Warrant
Certificates shall be dated the date of execution by the Company upon initial
issuance, division, exchange, substitution or transfer.

           Upon exercise, in part or in whole, of the Warrants, certificates
representing the
                                       6
<PAGE>
 
Shares shall bear a legend substantially similar to the following:

 
       "The securities represented by this certificate have not been registered
       under the Securities Act of 1933, as amended (the "Act"), and may not be
       offered or sold except (i) pursuant to an effective registration
       statement under the Act or (ii) pursuant to an exemption from the Act's
       registration requirements either pursuant to Rule 144 under the Act or
       otherwise, upon the delivery by the holder to the Company of an opinion
       of counsel, reasonably satisfactory to counsel to the Company, stating
       that an exemption from registration under such Act is available."


        5.  Restriction on Transfer of Warrants.
            -----------------------------------

        The Holder of a Warrant Certificate, by its acceptance thereof, 
covenants and agrees that the Warrants are being acquired as an investment and
not with a view to the distribution thereof.

        6.  Price.
            -----

            6.1.  Initial and Adjusted Exercise Price.  The initial exercise 
                  -----------------------------------
price of each Warrant shall be $5.00 per Share. The adjusted exercise price
shall be the price which shall result from time to time from any and all
adjustments of the initial exercise price in accordance with the provisions of
Section 8 hereof.

            6.2.  Exercise Price.  The term "Exercise Price" herein shall mean
                  --------------
the initial exercise price or the adjusted exercise price, depending upon the
context.


        7.  Registration Rights.
            -------------------

            7.1.  Registrable Securities.  As used herein the term "Registrable
                  ----------------------
Security"

                                       7
<PAGE>
 
means each of the Shares; provided, however, that with respect to any particular
Registrable Security, such security shall cease to be a Registrable Security
when, as of the date of determination, (i) it has been effectively registered
under the Act and disposed of pursuant thereto, (ii) registration under the Act
is no longer required for the immediate public distribution of such security, or
(iii) it has ceased to be outstanding.  The term "Registrable Securities" means
any and/or all of the securities falling within the foregoing definition of a
"Registrable Security."  In the event of any merger, reorganization,
consolidation, recapitalization or other change in corporate structure affecting
the Common Stock, such adjustment shall be made in the definition of
"Registrable Security" as is appropriate in order to prevent any dilution or
enlargement of the rights granted pursuant to this Section 7.

            7.2.  Demand Registration.
                  -------------------

                    (a) At any time during the Warrant Exercise Term, any 
"Majority Holder" (as such term is defined in Section 7.2(d) below) of the
Registrable Securities shall have the right (which right is in addition to the
piggyback registration rights provided for under Section 7.3 hereof),
exercisable by written notice to the Company (the "Demand Registration
Request"), to have the Company prepare and file with the Securities and Exchange
Commission (the "Commission") on two occasions, at the sole expense of the
Company (except as provided in Section 7.4(c) hereof), a Registration Statement
and such other documents, including a prospectus, as may be necessary in the
opinion of both counsel for the Company and counsel for such Majority Holder in
order to comply with the provisions of the Act, so as to permit a public

                                       8
<PAGE>
 
offering and sale of the Registrable Securities by the holders thereof. The
Company shall use its commercially reasonable efforts to cause the Registration
Statement to become effective under the Act, so as to permit a public offering
and sale of the Registrable Securities by the holders thereof.

                    (b)  Once effective, the Company, subject to the proviso at
the end of this sentence, will be required to maintain the effectiveness of the
Registration Statement until the earlier of (i) the date that all of the
Registrable Securities have been publicly sold, or (ii) the date that the
Placement Agent receives an opinion of counsel to the Company that all of the
Registrable Securities may be freely traded without registration under the Act,
under Rule 144 promulgated under the Act, or otherwise.

                    (c)  The Company covenants and agrees to give written 
notice of any Demand Registration Request to all holders of the Registrable
Securities within ten (10) business days from the date of the Company's receipt
of any such Demand Registration Request. After receiving notice from the Company
as provided in this Section 7.2(c), holders of Registrable Securities may
request the Company to include their Registrable Securities in the Registration
Statement to be filed pursuant to Section 7.2(a) hereof by notifying the Company
of their decision to have such securities included within ten (10) days of their
receipt of the Company's notice.

                    (d)  The term "Majority Holder" as used in Section 7.2 
hereof shall mean any holder or any combination of holders of Registrable
Securities, if included in such holders' Registrable Securities are that
aggregate number of Shares (including Shares already issued and Shares issuable
pursuant to the exercise of outstanding Warrants) as would constitute a

                                       9
<PAGE>
 
majority of the aggregate number of Shares (including Shares already issued and
Shares issuable pursuant to the exercise of outstanding Warrants) included in
all the Registrable Securities.

        7.3.  Piggyback Registration.  If, at any time during the seven years
              ---------------------- 
following the final closing date of the Offering, the Company proposes to
prepare and file any new registration statement or post-effective amendments
thereto covering equity or debt securities of the Company (other than a
registration statement to be filed by the Company within 45 days after the date
of final closing of the sale of the Debentures pursuant to the terms of the
Offering), or any such securities of the Company held by its stockholders (in
any such case, other than in connection with a merger, acquisition or pursuant
to Form S-8 or successor form) (for purposes of this Article 7, collectively,
the "Registration Statement"), it will give written notice of its intention to
do so by registered mail ("Notice"), at least thirty (30) business days prior to
the filing of each such Registration Statement, to all holders of the
Registrable Securities.  Upon the written request of such a holder (a
"Requesting Holder"), made within twenty (20) business days after receipt of the
Notice, that the Company include any of the Requesting Holder's Registrable
Securities in the proposed Registration Statement, the Company shall, as to each
such Requesting Holder, use its best efforts to effect the registration under
the Act of the Registrable Securities which it has been so requested to register
("Piggyback Registration"), at the Company's sole cost and expense and at no
cost or expense to the Requesting Holders (except as provided in Section 7.4(c)
hereof).

        Notwithstanding the provisions of this Section 7.3, the Company shall 
have the

                                       10
<PAGE>
 
right at any time after it shall have given written notice pursuant to this
Section 7.3 (irrespective of whether any written request for inclusion of
Registrable Securities shall have already been made) to elect not to file any
such proposed Registration Statement, or to withdraw the same after the filing
but prior to the effective date thereof.

        7.4.  Covenants of the Company With Respect to Registration.  The 
              ----------------------------------------------------- 
Company covenants and agrees as follows:

                (a)  In connection with any registration under Section 7.2 
hereof, the Company shall file the Registration Statement as expeditiously as
possible, but in any event no later than thirty (30) days following receipt of
any demand therefor, shall use commercially reasonable efforts to have any such
Registration Statement declared effective at the earliest possible time, and
shall furnish each holder of Registrable Securities such number of prospectuses
as shall reasonably be requested.

                (b)  If any stop order shall be issued by the Commission in 
connection therewith, the Company shall use its best efforts to obtain the
removal of such order. Following the effective date of a Registration Statement,
the Company shall, upon the request of the Holder, forthwith supply such
reasonable number of copies of the Registration Statement, preliminary
prospectus and prospectus meeting the requirements of the Act, and other
documents necessary or incidental to the public offering of the Registrable
Securities, as shall be reasonably requested by the Holder to permit the Holder
to make a public distribution of the Holder's Registrable Securities.

                                       11
<PAGE>
 
                (c)  The Company shall pay all costs, fees and expenses in 
connection with a Registration Statement filed pursuant to Section 7.2 or 7.3
hereof, including, without limitation, the Company's legal and accounting fees,
printing expenses, and blue sky fees and expenses; provided, however, that the
Holder shall be solely responsible for the fees of any counsel retained by the
Holder in connection with such registration and any transfer taxes or
underwriting discounts, commissions or fees applicable to the Registrable
Securities sold by the Holder pursuant thereto.

                (d)  Nothing contained in this Agreement shall be construed as
requiring any Holder to exercise his Warrants prior to the initial filing of any
Registration Statement or the effectiveness thereof.

                (e)  The Company will take all necessary action which may be 
required in qualifying or registering the Registrable Securities included in the
Registration Statement, for offer and sale under the securities or blue sky laws
of such states as are reasonably requested by the holders of such securities.

                (f)  The Company shall indemnify any holder of the Registrable
Securities to be sold pursuant to any Registration Statement and any underwriter
or person deemed to be an underwriter under the Act and each person, if any, who
controls such holder or underwriter or person deemed to be an underwriter within
the meaning of Section 15 of the Act or Section 20(a) of the Securities Exchange
Act of 1934, as amended ("Exchange Act"), against all loss, claim, damage,
expense or liability (including all expenses reasonably incurred in

                                       12
<PAGE>
 
investigating, preparing or defending against any claim whatsoever) to which any
of them may become subject under the Act,the Exchange Act or otherwise, arising
from such registration statement to the same extent and with the same effect as
the provisions pursuant to which the Company has agreed to indemnify the
Placement Agents as set forth in Section 10 of the Placement Agency Agreement
and to provide for just and equitable contribution as set forth in Section 10 of
the Placement Agency Agreement.

                (g)  Any holder of Registrable Securities to be sold pursuant 
to a registration statement, and such Holder's successors and assigns, shall
severally, and not jointly, indemnify, the Company, its officers and directors
and each person, if any, who controls the Company within the meaning of Section
15 of the Act or Section 20(a) of the Exchange Act, against all loss, claim,
damage or expense or liability (including all expenses reasonably incurred in
investigating, preparing or defending against any claim whatsoever) to which
they may become subject under the Act, the Exchange Act or otherwise, arising
from information furnished by or on behalf of such holder, or such Holder's
successors or assigns, for specific inclusion in such Registration Statement to
the same extent and with the same effect as the provisions pursuant to which the
Placement Agents have agreed to indemnify the Company as set forth in Section 10
of the Placement Agency Agreement and to provide for just and equitable
contribution as set forth in Section 10 of the Placement Agency Agreement.

                (h)  The Company shall promptly deliver copies of all 
correspondence between the Commission and the Company, its counsel or auditors
with respect to the 

                                       13
<PAGE>
 
Registration Statement to each holder of Registrable Securities included for
such Registration Statement pursuant to Section 7.2 or Section 7.3 hereof
requesting such correspondence to the managing underwriter, if any, of the
offering in connection with which such Holder's Registrable Securities are being
registered and shall permit each holder of Registrable Securities and such
underwriter to do such reasonable investigation, upon reasonable advance notice,
with respect to information contained in or omitted from the Registration
Statement as it deems reasonably necessary to comply with applicable securities
laws or rules of the National Association of Securities Dealers, Inc. Such
investigation shall include access to books, records and properties and
opportunities to discuss the business of the Company with its officers and
independent auditors, all to such reasonable extent and at such reasonable times
and as often as any such holder of Registrable Securities or underwriter shall
reasonably request. Any copying, courier and travel expenses incurred by the
Company in complying with such investigations shall be borne by the party
requesting the information.

                (i)  Neither the filing of a Registration Statement by the 
Company pursuant to this Agreement nor the making of any request for
prospectuses by the Holder shall impose upon the Holder any obligation to sell
the Holder's Registrable Securities.

                (j)  If the Company fails to keep the Registration Statement 
continuously effective during the requisite period (except as set forth in
Section 7.2(b), above), then the Company shall promptly update the Registration
Statement or file a new registration statement covering the Registrable
Securities remaining unsold, subject to the terms and provisions hereof.

                                       14
<PAGE>
 
        8.  Adjustments of Exercise Price and Number of Shares.
            --------------------------------------------------

            8.1.  Subdivision and Combination.  In case the Company shall at 
                  --------------------------- 
any time subdivide or combine the outstanding shares of Common Stock, the 
Exercise Price shall forthwith be proportionately decreased in the case of
subdivision or increased in the case of combination.

            8.2.  Adjustment in Number of Shares.  Upon each adjustment of the
                  ------------------------------ 
Exercise Price pursuant to the provisions of this Section 8, the number of
Shares issuable upon the exercise of each Warrant shall be adjusted to the
nearest full Share by multiplying a number equal to the Exercise Price in effect
immediately prior to such adjustment by the number of Shares issuable upon
exercise of the Warrants immediately prior to such adjustment and dividing the
product so obtained by the adjusted Exercise Price.

            8.3.  Reclassification, Consolidation, Merger, etc.  In case of any
                  -------------------------------------------- 
reclassification or change of the outstanding shares of Common Stock (other than
a change in par value to no par value, or from no par value to par value, or as
a result of a subdivision or combination), or in the case of any consolidation
of the Company with, or merger of the Company into, another corporation (other
than a consolidation or merger in which the Company is the surviving corporation
and which does not result in any reclassification or change of the outstanding
shares of Common Stock, except a change as a result of a subdivision or
combination of such shares or a change in par value, as aforesaid), or in the
case of a sale or conveyance to another corporation of the property of the
Company as an entirety, the Holders shall thereafter 

                                       15
<PAGE>
 
have the right to purchase the kind and number of shares of stock and other
securities and property receivable upon such reclassification, change,
consolidation, merger, sale or conveyance by a Holder of the number of shares of
Common Stock which the holder of such Warrant shall then be entitled to
purchase; such adjustments shall apply with respect to all such changes
occurring between the date of this Warrant Agreement and the date of exercise of
such Warrant.

             8.4.  Dividends and Other Distributions with Respect to Outstanding
                   -------------------------------------------------------------
Securities.  Subject to the provisions of this Section 8, in case the Company
- ---------- 
shall, at any time prior to the exercise of the Warrants, make any distribution
of its assets to holders of its Common Stock as a liquidating or a partial
liquidating dividend, then, subject to the following sentence, the Holder who
exercises Warrants after the record date for the determination of those holders
of Common Stock entitled to such distribution of assets as a liquidating or
partial liquidating dividend shall be entitled to receive for the Warrant Price
per Warrant, in addition to each share of Common Stock, the amount of such
distribution (or, at the option of the Company, a sum equal to the value of any
such assets at the time of such distribution as determined by the Board of
Directors of the Company in good faith), which would have been payable to such
Holder had he been the holder of record of the Common Stock receivable upon
exercise of the Warrant on the record date for the determination of those
entitled to such distribution.  In case of the dissolution, liquidation or
winding up of the Company, all rights under the Warrants shall terminate on a
date fixed by the Company, such date to be no earlier than ten (10) days prior
to the effectiveness of such dissolution, liquidation or winding up and not
later than five (5) days prior to such

                                       16
<PAGE>
 
effectiveness. Notice of such termination of purchase rights shall be given to
the last registered holder of the Warrants, as the same shall appear on the
books of the Company, by registered mail at least thirty (30) days prior to such
termination date.

            8.5.  Subscription Rights for Shares of Common Stock or Other 
                  -------------------------------------------------------
Securities.  In case the Company shall, at any time prior to the expiration of
- ----------
the Warrants and prior to the exercise thereof, offer to the holders of its
Common Stock any rights to subscribe for additional shares of any class of the
Company, then the Company shall give written notice thereof to the last
registered holder thereof not less than thirty (30) days prior to the date on
which the books of the Company are closed or a record date is fixed for the
determination of the stockholders entitled to such subscription rights. Such
notice shall specify the date as to which the books shall be closed or record
date fixed with respect to such offer of subscription, and the right of the
holder thereof to participate in such offer of subscription shall terminate if
the Warrant shall not be exercised on or before the date of such closing of the
books or such record date.

        9.  Exchange and Replacement of Warrant Certificates.
            ------------------------------------------------

        Each Warrant Certificate is exchangeable without expense, upon the 
surrender hereof by the registered Holder at the principal executive office of
the Company, for a new Warrant Certificate of like tenor and date representing
in the aggregate the right to purchase the same number of Shares in such
denominations as shall be designated by the Holder thereof at the time of such
surrender.

        Upon receipt by the Company of evidence reasonably satisfactory to it 
of the loss, 

                                       17
<PAGE>
 
theft, destruction or mutilation of any Warrant Certificate, and, in case
of loss, theft or destruction, of indemnity or security reasonably satisfactory
to it, and reimbursement to the Company of all reasonable expenses incidental
thereto, and upon surrender and cancellation of the Warrants, if mutilated, the
Company will make and deliver a new Warrant Certificate of like tenor, in lieu
thereof.

        10.  Elimination of Fractional Interests.
             -----------------------------------

        The Company shall not be required to issue certificates representing 
fractions of Shares upon the exercise of the Warrants, nor shall it be required
to issue scrip or pay cash in lieu of fractional interests, it being the intent
of the parties that all fractional interests shall be eliminated by rounding any
fraction up to the nearest whole number of Shares.

        11.  Reservation and Listing of Securities.
             -------------------------------------

        The Company shall at all times reserve and keep available out of its 
authorized shares of Common Stock, solely for the purpose of issuance upon the
exercise of the Warrants, such number of shares of Common Stock as shall be
issuable upon the exercise thereof. The Company covenants and agrees that, upon
exercise of the Warrants and payment of the Exercise Price therefor, all Shares
issuable upon such exercise shall be duly and validly issued, fully paid, non-
assessable and not subject to the preemptive rights of any shareholder. As long
as the Warrants shall be outstanding, the Company shall use its reasonable best
efforts to cause all shares of Common Stock issuable upon the exercise of the
Warrants to be listed on or quoted by the American Stock Exchange or listed on
the stock exchange or quotation system on which the 

                                       18
<PAGE>
 
Common Stock is principally traded.

        12.  Notices to Warrant Holders.
             --------------------------

        Nothing contained in this Agreement shall be construed as conferring 
upon the Holder or Holders the right to vote or to consent or to receive notice
as a stockholder in respect of any meetings of stockholders for the election of
directors or any other matter, or as having any rights whatsoever as a
stockholder of the Company. If, however, at any time prior to the expiration of
the Warrants and their exercise, any of the following events shall occur:

             (a)  the Company shall take a record of the holders of its shares 
          of Common Stock for the purpose of entitling them to receive a
          dividend or distribution payable otherwise than in cash, or a cash
          dividend or distribution payable otherwise than out of current or
          retained earnings, as indicated by the accounting treatment of such
          dividend or distribution on the books of the Company; or

             (b)  the Company shall offer to all the holders of its Common 
          Stock any additional shares of capital stock of the Company or
          securities convertible into or exchangeable for shares of capital
          stock of the Company, or any option, right or warrant to subscribe
          therefor; or

             (c)  a dissolution, liquidation or winding up of the Company 
          (other than in connection with a consolidation or merger) or a sale of
          all or substantially all of its property, assets and business as an
          entirety shall be proposed;

                                       19
<PAGE>
 
             (d)  reclassification or change of the outstanding shares of 
          Common Stock (other than a change in par value to no par value, or
          from no par value to par value, or as a result of a subdivision or
          combination), consolidation of the Company with, or merger of the
          Company into, another corporation (other than a consolidation or
          merger in which the Company is the surviving corporation and which
          does not result in any reclassification or change of the outstanding
          shares of Common Stock, except a change as a result of a subdivision
          or combination of such shares or a change in par value, as aforesaid),
          or a sale or conveyance to another corporation of the property of the
          Company as an entirety is proposed; or

             (e)  The Company or an affiliate of the Company shall propose to
          issue any rights to subscribe for shares of Common Stock or any other
          securities of the Company or of such affiliate to all the stockholders
          of the Company;

then, in any one or more of said events, the Company shall give written notice
to the Holder or Holders of such event at least twenty (20) days prior to the
date fixed as a record date or the date of closing the transfer books for the
determination of the stockholders entitled to such dividend, distribution,
convertible or exchangeable securities or subscription rights, options or
warrants, or entitled to vote on such proposed dissolution, liquidation, winding
up or sale.  Such notice shall specify such record date or the date of closing
the transfer books, as the case may be.  Failure to give such notice or any
defect therein shall not affect the validity of any action taken in connection
with the declaration or payment of any such dividend or distribution, or the
issuance of any 

                                       20
<PAGE>
 
convertible or exchangeable securities or subscription rights, options or
warrants, or any proposed dissolution, liquidation, winding up or sale.

        13.  Notices.
             -------

        All notices, requests, consents and other communications hereunder shall
be in writing and shall be deemed to have been duly made when delivered, or
mailed by registered or certified mail, return receipt requested:

             (a)  If to a registered Holder of the Warrants, to the address of
        such Holder as shown on the books of the Company; or

             (b)  If to the Company, to the address set forth in Section 3.1 
        of this Agreement or to such other address as the Company may designate
        by notice to the Holders.

        14.  Supplements and Amendments.
             --------------------------

        The Company and the Placement Agents may from time to time supplement or
amend this Agreement without the approval of any Holders of the Warrants and/or
Shares in order to cure any ambiguity, to correct or supplement any provision
contained herein which may be defective or inconsistent with any provisions
herein, or to make any other provisions in regard to matters or questions
arising hereunder which the Company and the Placement Agents may deem necessary
or desirable and which the Company and the Placement Agents deem not to
adversely affect the interests of the Holders of Warrant Certificates.

                                       21
<PAGE>
 
        15.  Successors.
             ----------

        All the covenants and provisions of this Agreement by or for the 
benefit of the Company and the Holders inure to the benefit of their respective
successors and assigns hereunder.

        16.  Termination.
             -----------

        This Agreement shall terminate at the close of business on July 31, 
2005. Notwithstanding the foregoing, this Agreement will terminate on any
earlier date when all Warrants have been exercised and all Shares have been
resold to the public; provided, however, that the provisions of Section 7 shall
survive such termination until the close of business on July 31, 2008.

        17.  Governing Law.
             -------------

        This Agreement and each Warrant Certificate issued hereunder shall be 
deemed to be a contract made under the laws of the State of New York and for all
purposes shall be construed in accordance with the laws of said State.

        18.  Benefits of This Agreement.
             --------------------------

        Nothing in this Agreement shall be construed to give to any person or
corporation other than the Company and the Placement Agents and any other
registered holder or holders of the Warrant Certificates or Shares any legal or
equitable right, remedy or claim under this 

                                       22
<PAGE>
 
Agreement; and this Agreement shall be for the sole and exclusive benefit of the
Company and the Placement Agents and any other holder or holders of the Warrant
Certificates or Shares.

        19.  Counterparts.
             ------------

        This Agreement may be executed in any number of counterparts and each 
of such counterparts shall for all purposes be deemed to be an original, and
such counterparts shall together constitute but one and the same instrument.

        IN WITNESS WHEREOF, the parties hereto have caused this Agreement to 
be duly executed, as of the day and year first above written.

                                       KFx INC.



                                       By:_________________________

                                         Name:
                                         Title:

                                       23
<PAGE>
 
                                       BLUESTONE CAPITAL PARTNERS, L.P.



                                       By: BlueStone Capital Management,
                                          Inc. (General Partner)



                                       By:____________________________

                                          Title:

Attest:


_______________________                JEFFERIES INTERNATIONAL LTD.



                                       By:____________________________

                                          Name:
                                          Title:


                                       24
<PAGE>
 
                                                            EXHIBIT A



THE WARRANTS REPRESENTED BY THIS CERTIFICATE AND THE OTHER SECURITIES ISSUABLE
UPON EXERCISE THEREOF HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933,
AS AMENDED (THE "ACT"), AND MAY NOT BE OFFERED OR SOLD EXCEPT (i) PURSUANT TO AN
EFFECTIVE REGISTRATION STATEMENT UNDER THE ACT, (ii) TO THE EXTENT APPLICABLE,
PURSUANT TO RULE 144 UNDER SUCH ACT (OR ANY SIMILAR RULE UNDER SUCH ACT RELATING
TO THE DISPOSITION OF SECURITIES), OR (iii) UPON THE DELIVERY BY THE HOLDER TO
THE COMPANY OF AN OPINION OF COUNSEL, REASONABLY SATISFACTORY TO COUNSEL FOR THE
COMPANY, STATING THAT AN EXEMPTION FROM REGISTRATION UNDER SUCH ACT IS
AVAILABLE.


THE TRANSFER OR EXCHANGE OF THE WARRANTS REPRESENTED BY THIS CERTIFICATE IS
RESTRICTED IN ACCORDANCE WITH THE WARRANT AGREEMENT REFERRED TO HEREIN.



                           EXERCISABLE ON OR BEFORE

                   5:00 P.M., NEW YORK TIME, _________, ____



No. W-                                                        _______ Warrants


                                 WARRANT CERTIFICATE



        This Warrant Certificate certifies that ___________________________ or
its registered assigns, is the registered holder of _______ Warrants to
purchase, at any time from ___________, 1997 until 5:00 P.M. New York City time
on __________, ____ ("Expiration Date"), up to a number of fully-paid and non-
assessable share(s) of common stock, $.001 par value ("Common Stock"), of KFx
Inc., a Delaware corporation (the "Company"), as is equal to 10% of the number
of shares of the Common Stock into which the aggregate principal amount of
Debentures sold in the Offering shall initially be convertible, based upon the
initial Holder Conversion Price, as defined in the indenture governing the
Debentures at the initial exercise price, subject to adjustment in certain
events (the "Exercise Price"), of $____ per one share of Common Stock upon
surrender of this Warrant Certificate and payment of the Exercise Price at an
office or agency of the Company, but subject to the conditions set forth herein
and in the warrant agreement dated as of _____________, 1997 by and among the
Company, BlueStone Capital Partners, L.P. and Jefferies International Ltd. (the
"Warrant Agreement"). This Warrant Certificate is exercisable only on the basis
of one share of Common Stock. Payment of the Exercise Price may be made in cash,
or by certified or official bank check in New York Clearing House funds payable
to the order of the Company, or any combination of cash or check or pursuant to
the "cashless exercise" provision set forth in Section 3.2 of the Warrant
Agreement.


        No Warrant may be exercised after 5:00 P.M., New York City time, on the

                                       25
<PAGE>
 
Expiration Date, at which time all Warrants evidenced hereby, unless exercised
prior thereto, shall thereafter be void.


        The Warrants evidenced by this Warrant Certificate are part of a duly 
authorized issue of Warrants issued pursuant to the Warrant Agreement, which
Warrant Agreement is hereby incorporated by reference in and made a part of this
instrument and is hereby referred to in a description of the rights, limitation
of rights, obligations, duties and immunities thereunder of the Company and the
holders (the words "holders" or "holder" meaning the registered holders or
registered holder) of the Warrants.


        The Warrant Agreement provides that upon the occurrence of certain 
events, the Exercise Price and the type and/or number of the Company's
securities issuable thereupon may, subject to certain conditions, be adjusted.
In such event, the Company will, at the request of the holder, issue a new
Warrant Certificate evidencing the adjustment in the Exercise Price and the
number and/or type of securities issuable upon the exercise of the Warrants;
provided, however, that the failure of the Company to issue such new Warrant
Certificates shall not in any way change, alter, or otherwise impair, the rights
of the holder as set forth in the Warrant Agreement.


        Upon due presentment for registration of transfer of this Warrant 
Certificate at an office or agency of the Company, a new Warrant Certificate or
Warrant Certificates of like tenor and evidencing in the aggregate a like number
of Warrants shall be issued to the transferee(s) in exchange for this Warrant
Certificate, subject to the limitations provided herein and in the Warrant
Agreement, without any charge except for any tax, or other governmental charge
imposed in connection therewith.


        Upon the exercise of less than all of the Warrants evidenced by this
Certificate, the Company shall forthwith issue to the holder hereof a new
Warrant Certificate representing such number of unexercised Warrants.


        The Company may deem and treat the registered holder(s) hereof as the 
absolute owner(s) of this Warrant Certificate (notwithstanding any notation of
ownership or other writing hereon made by anyone), for the purpose of any
exercise hereof, and of any distribution to the holder(s) hereof, and for all
other purposes, and the Company shall not be affected by any notice to the
contrary.


        All terms used in this Warrant Certificate which are defined in the 
Warrant Agreement shall have the meanings assigned to them in the Warrant
Agreement.

                                       26
<PAGE>
 
        IN WITNESS WHEREOF, the Company has caused this Warrant Certificate to
be duly executed under its corporate seal.

Dated:  _________, 1997                 KFx INC.


[SEAL]                                  By:__________________________

                                            Name:
                                            Title:



Attest:


______________________

                                       27
<PAGE>
 
                        [FORM OF ELECTION TO PURCHASE]


        The undersigned hereby irrevocably elects to exercise the right, 
represented by this Warrant Certificate, to purchase _________ Shares and 
herewith tenders in payment for such Shares cash or a check payable to the 
order of KFx Inc. in the amount of $____________, all in accordance with the 
terms hereof.  The undersigned requests that a certificate for such Shares be 
registered in the name of ___________________, whose address is______________,
and that such Certificate be delivered to _____________________, whose
address is_________________.
          



Dated:                  Signature: ________________________


                              (Signature must conform in all respects to name of
                              holder as specified on the face of the Warrant
                              Certificate.)



                       ________________________________



                       ________________________________

                       (Insert Social Security or Other
                         Identifying Number of Holder)

                                       28
<PAGE>
 
                                 [FORM OF ASSIGNMENT]



            (To be executed by the registered holder if such holder
                 desires to transfer the Warrant Certificate.)



  FOR VALUE RECEIVED __________________________________

hereby sells, assigns and transfers unto

- ---------------------------------------------
(Please print name and address of transferee)


this Warrant Certificate, together with all right, title and interest therein,
and does hereby irrevocably constitute and appoint _______________, Attorney, to
transfer the within Warrant Certificate on the books of the within-named
Company, with full power of substitution.



Dated:          Signature: ______________________


                         (Signature must conform in all respects to name of
                         holder as specified on the face of the Warrant
                         Certificate)



_______________________________


_______________________________
(Insert Social Security or Other
Identifying Number of Assignee)

                                       29


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