Document:

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EXHIBIT 4.4

THIS WARRANT AND THE COMMON STOCK ISSUABLE UPON THE EXERCISE HEREOF HAVE NOT
BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR QUALIFIED UNDER
ANY APPLICABLE STATE SECURITIES LAWS. THEY MAY NOT BE SOLD, OFFERED FOR SALE,
PLEDGED, HYPOTHECATED OR TRANSFERRED IN THE ABSENCE OF SUCH REGISTRATION AND
QUALIFICATION WITHOUT AN OPINION OF COUNSEL SATISFACTORY TO THE COMPANY STATING
THAT SUCH REGISTRATION AND QUALIFICATION IS NOT REQUIRED.

                                                                  100,000 SHARES

                          COMMON STOCK PURCHASE WARRANT

                                   OF KFx INC.

                                  July 28, 2001
                                  -------------

                * * * * * * * * * * * * * * * * * * * * * * * * *

        THIS IS TO CERTIFY that, for value received and subject to the
provisions hereinafter set forth, H.M.R., L.P., a Delaware limited partnership
with its principal place of business at 27 Signal Road, Stamford, CT 06902 (the
"Warrant Holder") (or his assigns), is entitled to purchase from KFx Inc, a
Delaware corporation ("Company") 100,000 shares (the "Warrant Shares") of the
Company's $.001 par value common stock (the "Common Stock" or "Shares"), for an
aggregate purchase price equal to $3.65 multiplied by one hundred thousand
(100,000) shares ("Aggregate Original Warrant Price"), all on and subject to the
terms, provisions and conditions hereinafter set forth. This Warrant may be
exercised as to all or part (comprising a whole number) of the Shares
represented hereby at any time or times before July 27, 2004 ("Expiration
Date"). This Warrant shall be void and of no effect, and all rights,
restrictions, and obligations hereunder shall cease to the extent not exercised
prior to the Expiration Date.

                         ARTICLE I. EXERCISE OF WARRANT

        Section 1.1 Duration. Subject to the provisions of Sections 1.2 and 1.4
hereof, this Warrant may be exercised at any time on or after 9:00 a.m., Denver,
Colorado time, on July 28, 2001 and at or before 5:00 p.m., Denver, Colorado
time, on July 27, 2004 (or, if such day is not a business day, at or before 5:00
p.m., Denver, Colorado time, on the next following business day). If this
Warrant is not exercised on or before the Expiration Date, it shall become void,
and all rights hereunder shall thereupon cease.

        Section 1.2 Exercise of Warrant. Subject to the conditions contained
herein, this Warrant may be exercised in whole or in part at any time or times
before the Expiration Date by the surrender of this Warrant or any duly
authorized replacements hereto (with a duly executed subscription agreement in
the form attached hereto) at the principal office of the Company in Denver,
Colorado, and upon payment to the Company of the Aggregate Original Warrant
Price (or, if exercised in part, upon payment to the Company of the applicable
proportionate part of the Aggregate Original Warrant Price) for each Share so
purchased in lawful money of the United States, or by check, or postal or
express money order payable in United States dollars to the order of the Company
or by funds wired to an account as specified by the Company, and upon compliance
with and subject to the conditions set forth herein.

        Upon receipt of this Warrant with the form of exercise duly executed and
accompanied by payment of the Aggregate Original Warrant Price for the shares of
Common Stock for which this Warrant is then being exercised, the Company will
cause to be issued certificates for the total number of whole Warrant Shares (as
provided in Article V hereof) for which this Warrant is being exercised in such
denominations as are required for delivery to the Warrant Holder, and the
Company shall thereupon deliver such certificates to the Warrant Holder or his
assignee.

        In case the Warrant Holder shall exercise this Warrant with respect to
less than all of the shares of Common Stock that may be purchased under this
Warrant, the Company will execute a new Warrant substantially in the form of
this Warrant for the balance of the shares of Common Stock that may be purchased
upon exercise of this Warrant and deliver such new Warrant to the Warrant
Holder.
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        The Company shall pay any and all transfer taxes payable in connection
with the issue of this Warrant or the issue of any Warrant Shares upon exercise
of this Warrant. The Company shall not, however, be required to pay any tax
which may be payable in respect of any transfer involved in the issuance or
delivery of this Warrant or the Warrant Shares in a name other than that of the
Warrant Holder at the time of surrender, and until the payment of such tax the
Company shall not be required to issue such Warrant Shares.

        Section 1.3 Warrant Holder Representation and Certificate Legend. Unless
the issuance of the Warrant Shares shall have been registered under the
Securities Act of 1933, as amended (the "1933 Act"), as a condition of its
delivery of certificates for the Warrant Shares or upon the split-up,
combination, exchange, transfer or loan of the Warrant, the Company may require
the Warrant Holder (including the transferee of the Warrant in whose name the
Warrant Shares are to be registered) to deliver to the Company, in writing,
representations regarding the Warrant Holder's sophistication, investment
intent, acquisition for his own account and such other matters as are reasonable
and customary for purchasers of securities in an unregistered private offering.
The Company may place conspicuously upon each new Warrant and upon each
certificate representing the Warrant Shares a legend substantially in the
following form, the terms of which are agreed to by the Warrant Holder
(including each transferee):

               THE SHARES REPRESENTED BY THIS CERTIFICATE HAVE BEEN ACQUIRED
        SOLELY FOR INVESTMENT AND HAVE NOT BEEN REGISTERED UNDER THE SECURITIES
        ACT OF 1933, AS AMENDED (THE "1933 ACT"), OR ANY STATE SECURITIES LAW.
        SUCH SHARES MAY NOT BE SOLD, OFFERED FOR SALE, PLEDGED OR HYPOTHECATED
        IN THE ABSENCE OF SUCH REGISTRATION OR AN OPINION OF COUNSEL
        SATISFACTORY TO THE COMPANY THAT SUCH SALE, OFFER, PLEDGE OR
        HYPOTHECATION IS EXEMPT FROM THE REGISTRATION AND PROSPECTUS DELIVERY
        REQUIREMENTS OF THE 1933 ACT AND OF ANY APPLICABLE STATE SECURITIES
        LAWS.

        The Company need not register a transfer of this Warrant or the Warrant
Shares unless the conditions specified in such legend are satisfied. Subject to
the transfer restrictions set forth in this Article I and in Articles IX and X
herein, this Warrant is transferable, in whole or in part, on the books of the
Company, upon surrender of this Warrant to the Company, together with a written
assignment duly executed by the Warrant Holder.

        Section 1.4 Vesting. This Warrant shall vest and be exercisable
effective July 28, 2001.

        Section 1.5 Exercise Price. The initial exercise price shall be $3.65
per share (the "Exercise Price").

                            ARTICLE II. ANTIDILUTION

        Section 2.1 Subdivisions or Combinations. In case the Company shall at
any time after the date of this Warrant (i) subdivide the outstanding Shares or
(ii) combine the outstanding Shares into a smaller number of Shares, the
Exercise Price and the number and kind of Shares receivable upon exercise, in
effect at the time of the effective date of such subdivision or combination,
shall be proportionately adjusted so that the holder of the Warrant exercised
after such time shall be entitled to receive the same percentage and kind of
shares which, if the Warrant had been exercised immediately prior to such date,
the holder would have owned upon such exercise and been entitled to receive by
virtue of such subdivision or combination. Such adjustment shall be made
successively whenever any event listed above shall occur and shall be
retroactive to the record date, if any, for such event. Any adjustment made
pursuant to this Section 2.1 shall become effective immediately upon the
effective date of such event retroactive to the record date, if any, for such
event. All calculations made under this Section 2.1 shall be made to the nearest
cent or to the nearest Share, as the case may be.

        Section 2.2 Reorganization, Reclassification or Consolidation. In case
of any capital reorganization of the Company, or of any reclassification of
Shares (other than a change in par value, or from par value to no par

                                       2
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value, or from no par value to par value, or as a result of subdivision or
combination), or in case of the consolidation of the Company with or the merger
of the Company into any other person (other than a consolidation or merger in
which the Company is the continuing corporation) or of the sale of the
properties and assets of the Company as, or substantially as, an entirety to any
other corporation, the Warrant shall after such reorganization,
reclassification, consolidation, merger or sale be exercisable, upon the terms
and conditions specified in this Agreement, for the number of shares of stock or
other securities, cash or other property to which a holder of the number of
Shares purchasable (at the time of such reorganization, reclassification,
consolidation, merger or sale) upon exercise of the Warrant would have been
entitled upon such reorganization, reclassification, consolidation, merger or
sale; and in any such case, if necessary, the provisions set forth in this
Section 2.2 with respect to the rights and interests thereafter of the holders
of the Warrant shall be appropriately adjusted so as to be applicable, as nearly
as may reasonably be, to any shares of stock or other securities, cash or other
property thereafter deliverable on the exercise of the Warrant. The subdivision
or combination of Shares at any time outstanding into a greater or lesser number
of Shares shall not be deemed to be a reclassification of the Common Stock for
the purposes of this Section 2.2. The Company shall not effect any such
consolidation, merger or sale unless prior to or simultaneously with the
consummation thereof the successor corporation (if other than the Company)
resulting from such consolidation or merger or the person purchasing such assets
or other appropriate corporation or entity shall assume, by written instrument
executed and delivered to the Company's and successor person's transfer agent,
if any, the obligation to deliver to the holders of the Warrant such shares of
stock, other securities, cash or other property as, in accordance with the
foregoing provisions, such holders may be entitled to purchase and the other
obligations of the Company under this Warrant.

        Section 2.3 Notices to the Warrant Holder. Upon any adjustment of the
Exercise Price or of the number or kind of Shares for which the outstanding
Warrant may be exercised pursuant to Article II, the Company, within 20 calendar
days thereafter, shall cause to be given to all of the holders of the Warrant,
at such holders' addresses appearing on the register or other records maintained
for such purpose, an officer's certificate showing the adjusted Exercise Price
and setting forth in reasonable detail the method of calculation and the facts
upon which such calculations are based and setting forth the number of Shares
purchasable upon exercise of the Warrant after such adjustment. Where
appropriate, such notice may be given in advance and included as a part of the
notice required to be mailed under the other provisions of this Article II.

        In case:

               (a) of any consolidation or merger to which the Company is a
        party and for which approval of any stockholders of the Company is
        required, or of the conveyance or transfer of the properties and assets
        of the Company as, or substantially as, an entirety, or of any capital
        reorganization or any reclassification of the Common Stock (other than a
        change in par value, or from par value to no par value, or from no par
        value to par value, or as a result of a subdivision or combination); or

               (b) of the voluntary or involuntary dissolution, liquidation or
        winding up of the Company;

then the Company shall cause to be mailed to the Warrant Holder at his address
appearing on the register or other records maintained by the Company for such
purpose, at least 20 calendar days (or 10 calendar days in any case specified in
clauses (a) or (b) above) prior to the applicable record or effective date
hereinafter specified a written notice stating the date on which any such
consolidation, merger, conveyance, transfer, reorganization, reclassification,
dissolution, liquidation or winding up is expected and that holders of record of
shares of Common Stock shall be entitled to exchange such shares for securities,
cash or other property, if any, deliverable upon such consolidation, merger,
conveyance, transfer, reorganization, reclassification, dissolution, liquidation
or winding up. The failure to give the notice required by this Section 2.3 or
any defect therein shall not affect the legality or validity of any
consolidation, merger, conveyance, transfer, reorganization, dissolution,
liquidation or winding up or the vote upon any action.

                                       3
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      ARTICLE III. MERGERS, CONSOLIDATIONS, SALES ANDOTHER REORGANIZATIONS

        In the case of any consolidation or merger of the Company with another
entity, or the sale or all or substantially all or its assets to another entity,
or any reorganization or reclassification of the Common Stock or other equity
securities of the Company, then, as a condition of such consolidation, merger,
sale, reorganization or reclassification, lawful and adequate provision shall be
made whereby the holder of this Warrant shall thereafter have the right to
receive upon the basis and upon the terms and conditions specified herein and in
lieu of the shares of Common Stock immediately theretofore purchasable
hereunder, such shares of stock, securities or assets as may (by virtue of such
consolidation, merger, sale, reorganization or reclassification) be issued or
payable with respect to or in exchange for a number of outstanding shares of
Common Stock equal to the number of shares of Common Stock immediately
theretofore so purchasable hereunder had such consolidation, merger, sale,
reorganization or reclassification not taken place, and in any such case
appropriate provisions shall be made with respect to the rights and interests of
the holder of this Warrant to the end that the provisions hereof shall
thereafter be applicable, as nearly as may be, in relation to any shares of
stock, securities or assets thereafter deliverable upon exercise of this
Warrant. The Company shall not effect any such consolidation, merger, sale or
reorganization, unless prior to or simultaneously with the consummation thereof,
the successor entity (if other than the Company) resulting from such
consolidation, merger or reorganization or the entity purchasing such assets
shall assume by written instrument executed and mailed or delivered to the
holder of this Warrant, the obligations to deliver to such holder such shares of
stock, securities or assets as, in accordance with the foregoing provisions,
such holder may be entitled to receive. Notwithstanding anything herein to the
contrary, in the event that any shareholders of the Company have an opportunity
to sell or exchange their shares of Common Stock pursuant to a consolidation,
merger, sale or reorganization or otherwise, each of the holders of the Warrant
may, if they so decide in their sole discretion, immediately exercise the
Warrant in whole or in part and, at their option sell or exchange any or all of
the Common Stock thereafter owned by such holders upon terms and conditions no
less favorable than those upon which the other shareholders are selling or
exchanging their shares of Common Stock.

                          ARTICLE IV. FRACTIONAL SHARES

        Anything contained herein to the contrary notwithstanding, the Company
shall not be required to issue any fraction of a share in connection with the
exercise of this Warrant, and in any case where the Warrant Holder would, except
for the provisions of this Article IV, be entitled under the terms of this
Warrant to receive a fraction of a share upon the exercise of this Warrant, the
Company shall upon the exercise of this Warrant and receipt of the Exercise
Price, issue the largest number of whole shares purchasable upon exercise of
this Warrant. The Company shall not be required to make any cash or other
adjustment in respect of such fraction of a share to which the Warrant Holder
would otherwise be entitled. The Warrant Holder, by the acceptance of this
Warrant, expressly waives his right to receive a certificate for any fraction of
a share upon exercise hereof.

                       ARTICLE V. FULLY PAID STOCK; TAXES

        The Company covenants and agrees that the shares of stock represented by
each and every certificate representing Common Stock to be delivered on the
exercise of the purchase rights herein provided for shall, at the time of such
delivery, be validly issued and outstanding and be fully paid and nonassessable.
The Company further covenants and agrees that it will pay when due and payable
any and all Federal, State and local taxes which may be payable in connection
with the issuance of this Warrant or any Common Stock or certificates therefor
or the exercise of the rights provided for pursuant to the provisions hereof,
including without limitation any such taxes relating to the exercise of any
purchase, conversion, or other rights contained herein, but specifically
excluding any Federal, State or local income taxes owing by the holders of the
Warrant.

                                       4
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                      ARTICLE VI. CLOSING OF TRANSFER BOOKS

        The right to exercise this Warrant shall not be suspended during any
period that the stock transfer books of the Company may be closed. The Company
shall not be required, however, to deliver certificates representing shares of
its Common Stock upon such exercise while such books are duly closed for any
purpose, but the Company may postpone the delivery of the certificates for such
Common Stock until the opening of such books, and they shall, in such case, be
delivered forthwith upon the opening thereof, or as soon as practicable
thereafter.

                       ARTICLE VII. REPLACEMENT OF WARRANT

        Upon receipt by the Company of evidence reasonably satisfactory to it of
the loss, theft, destruction or mutilation of this Warrant, and, in the case of
such loss, theft or destruction, upon delivery to the Company of indemnity or
security reasonably satisfactory to it and reimbursement to the Company of all
reasonable expenses incidental thereto, or, in the case of any such mutilation,
upon surrender and cancellation of this Warrant, the Company will make and
deliver a new Warrant of like tenor, in lieu of this Warrant.

                       ARTICLE VIII. RESERVATION OF SHARES

        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 this Warrant, such number of shares of Common Stock as shall be
issuable upon the exercise of this Warrant. The Company covenants and agrees
that, upon exercise of this Warrant and payment of the Purchase Price therefor,
all shares of Common Stock issuable upon such exercise shall be duly and validly
issued, fully paid and non-assessable.

ARTICLE IX. RESTRICTIONS ON TRANSFERABILITY OF WARRANTS AND SHARES; COMPLIANCE
                                    WITH LAWS

        Section 9.1 In General. This Warrant and the Warrant Shares issued upon
the exercise hereof shall not be transferable except upon the conditions
hereinafter specified, which conditions are intended to insure compliance with
the provisions of the 1933 Act (or any similar Federal statute at the time in
effect) and any applicable State securities laws in respect of the transfer of
this Warrant or any such Warrant Shares.

        Section 9.2 Restrictive Legends. Each Warrant shall bear on the face
thereof a legend substantially in the form of the notice endorsed on the first
page of this Warrant. Each certificate for shares of Common Stock initially
issued upon the exercise of any Warrant and each certificate for shares of
Common Stock issued to a subsequent transferee of such certificate shall, unless
otherwise permitted by the provisions of this Section 9.2, bear on the face
thereof a legend reading substantially as follows:

               THE SHARES REPRESENTED BY THIS CERTIFICATE HAVE BEEN ACQUIRED
        SOLELY FOR INVESTMENT AND HAVE NOT BEEN REGISTERED UNDER THE SECURITIES
        ACT OF 1933, AS AMENDED (THE "1933 ACT"), OR ANY STATE SECURITIES LAW.
        SUCH SHARES MAY NOT BE SOLD, OFFERED FOR SALE, PLEDGED OR HYPOTHECATED
        IN THE ABSENCE OF SUCH REGISTRATION OR AN OPINION OF COUNSEL
        SATISFACTORY TO THE COMPANY THAT SUCH SALE, OFFER, PLEDGE OR
        HYPOTHECATION IS EXEMPT FROM THE REGISTRATION AND PROSPECTUS DELIVERY
        REQUIREMENTS OF THE 1933 ACT AND OF ANY APPLICABLE STATE SECURITIES
        LAWS.

        In the event that a registration statement covering the Warrant Shares
shall become effective under the 1933 Act and under any applicable State
securities laws or in the event that the Company shall receive an opinion of
counsel satisfactory to it that, in the opinion of such counsel, such legend is
not, or is no longer, necessary or required (including, without limitation,
because of the availability of the exemption afforded by Rule 144 of the

                                       5
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General Rules and Regulations of the Securities and Exchange Commission), the
Company shall, or shall instruct its transfer agents and registrars to, remove
such legend from the certificates evidencing the Warrant Shares or issue new
certificates without such legend in lieu thereof. All fees and expenses of
counsel in connection with the rendition of the opinion provided for in this
Section 9.2 shall be paid by the holder.

        Section 9.3 Notice of Proposed Transfer; Registration Not Required. The
holder of this Warrant or of any Warrant Shares, by acceptance thereof, agrees
to give prior written notice to the Company of such holder's intention to
transfer such Warrant or the Warrant Shares relating thereto (or any portion
thereof) describing briefly the manner and circumstances of the proposed
transfer. Promptly after receiving such written notice, the Company shall
present copies thereof to Company counsel and to counsel designated by such
holder, who may be an employee of such holder. If in the opinion of each such
counsel the proposed transfer may be affected without registration or
qualification of such Warrant or the Warrant Shares under any Federal or State
law, the Company, as promptly as practicable, shall notify such holder of such
opinion and of the terms and conditions, if any, to be observed, whereupon such
holder shall be entitled to transfer such Warrant or Warrant Shares, all in
accordance with the terms of the notice delivered to such holder by the Company.
If either of such counsel is unable to render such an opinion (in which case
said counsel shall set forth in writing the basis for the legal conclusions in
this regard), the Company shall promptly notify such holder that the proposed
transfer described in the written notice given pursuant to this subsection may
not be effected without such registration or qualification or without compliance
with the conditions of an exemptive regulation of the Commission and any
applicable State Securities regulatory authority. Such holder shall not be
entitled to effect such transfer until such registration, qualification,
exemption or other compliance has become effective. All fees and expenses of
counsel in connection with the rendition of the opinions provided for in this
subsection shall be paid by the holder requesting the transfer.

                            ARTICLE X. MISCELLANEOUS

        Section 10.1 Warrant Holder As Owner. Prior to due presentment for
registration of transfer of this Warrant, the Company may deem and treat the
Warrant Holder as the absolute owner of this Warrant (notwithstanding any
notation of ownership or other writing hereon) for the purpose of any exercise
hereof and for all other purposes, and the Company shall not be affected by any
notice to the contrary.

        Section 10.2 Warrant Holder Not Shareholder. This Warrant does not
confer upon the holder hereof any right to vote or to consent or to receive
notice as a shareholder of the Company, as such, in respect of any matters
whatsoever, or any other rights or liabilities as a shareholder, prior to the
exercise hereof as hereinbefore provided.

        Section 10.3 Warrant Holder Representation. Notwithstanding anything to
the contrary herein, the Warrant Holder represents and warrants that (a) it
acknowledges that the Warrant and the Warrant Shares have not been registered
under the 1933 Act or any state securities laws, (b) the Warrants and the
Warrant Shares (unless such Warrants and/or Warrant Shares, as the case may be,
are registered under the 1933 Act and applicable state securities laws) are
being and will be issued pursuant to an exemption from registration for
nonpublic offerings or offerings to one or more accredited investors, (c) that
the Warrant Holder is acquiring the Warrant and will acquire the Warrant Shares
(unless such Warrants and/or Warrant Shares are registered under the 1933 Act
and applicable state securities laws) for his own account and not with a view
toward their distribution, (d) the Warrant Holder is experienced in making
investments of this nature and has the necessary sophistication to be able to
evaluate the merits of this investment and (e) the Warrant Holder will not sell,
offer for sale, pledge or otherwise hypothecate the Warrant or the Warrant
Shares (unless such shares are registered under the 1933 Act and applicable
state securities laws) in the absence of an opinion of counsel reasonably
acceptable to the Company, that the sale, offer for sale, pledge or
hypothecation of the Warrant and Warrant Shares is exempt from the registration
and prospectus delivery requirements of the 1933 Act and applicable state
securities laws.

                                       6
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        Section 10.4  Partial Exercise and Partial Assignment.

               (a) If this Warrant is exercised in part only, the holder shall
        upon surrender hereof be entitled to receive a new Warrant, registered
        in the name of the holder or its nominee. This Warrant may be assigned
        either in whole or in part by surrender of this Warrant at the principal
        office of the Company in Denver, Colorado (with the assignment or, as
        the case may be, partial assignment form at the end hereof duly
        executed). If this Warrant is assigned, a new Warrant shall be issued to
        the holder hereof, registered in the name of such holder or its nominee.
        The assignee shall also be entitled to receive a new Warrant, registered
        in the name of such assignee or its nominee.

               (b) Subject to the provisions of paragraph (a) of this Section
        11.4 this Warrant and the Warrant Shares may not be sold or otherwise
        disposed of except as follows:

                      (i) to a person who, in the opinion of counsel reasonably
               satisfactory to the Company, is a person to whom this Warrant or
               the Warrant Shares may legally be transferred without
               registration and without the delivery of a current prospectus
               under the 1933 Act with respect thereto and then only against
               receipt of an agreement of such person to comply with the
               provisions of this Warrant with respect to any resale or other
               disposition of such securities; or

                      (ii) to any person upon delivery of a prospectus then
               meeting the requirements of the 1933 Act relating to such
               securities (as to which a registration statement under the 1933
               Act shall then be in effect) and the offering thereof for such
               sale or disposition.

        Section 10.5 Successors. All the covenants, agreements, representations
and warranties contained in this Warrant shall bind the parties hereto and their
respective heirs, executors, administrators, distributees, successors and
assigns.

        Section 10.6 Severability. Should any part of this Warrant for any
reason be declared invalid, such decision shall not affect the validity of any
remaining portion, which remaining portion shall remain in force and effect as
if this Warrant had been executed with the invalid portion thereof eliminated,
and it is hereby declared the intention of the parties hereto that they would
have executed and accepted the remaining portion of this Warrant without
including therein any such part, parts or portion which may, for any reason, be
hereafter declared invalid.

        Section 10.7 Notices. Any notices required to be given pursuant to the
terms hereof shall be given (unless otherwise herein expressly provided) in
writing and either (i) personally delivered, (ii) sent by certified, return
receipt requested, (iii) sent by prepaid overnight courier, or (iv) transmitted
by telecopier or similar device, with confirmation of receipt. Notices shall be
addressed, if to holder of Warrants or Warrant Shares, to:

                             H.M.R., L.P.
                             27 Signal Road
                             Stamford CT 26902

or to such other address of such holder appearing in the register maintained by
the Company, and if to the Company, to:

                             KFx Inc.
                             3300 East First Avenue, Suite 290
                             Denver, CO 80206
                             Attn:  Corporate Secretary

        For purposes of this Warrant, any notice sent by mail shall be demand
given on the date deposited in the mail.

                                       7
<PAGE>

        Section 10.8 Headings. The Article headings in this Warrant are inserted
for purposes of convenience only and shall have no substantive effect.

        Section 10.9 Law Governing. This Warrant is delivered in the State of
Colorado and shall be construed and enforced in accordance with, and governed
by, the laws of the State of Colorado.

        Section 10.10 Amendments and Modifications. This Warrant may be amended
or modified only with the prior written consent of the holder hereof.

                                       8
<PAGE>

        WITNESS the seal of the Company and the signatures of its duly
authorized officers.

                                    KFx Inc.

                                    _________________________________________
                                    Theodore Venners, Chief Executive Officer

        (SEAL)
                                    _________________________________________
                                    R. G. Swenson, Secretary

                                       9
<PAGE>

                                    KFx INC.
                                SUBSCRIPTION FORM
                    (To be executed by the Registered Holder
in order to Exercise the Warrant)

        The undersigned hereby irrevocably elects to exercise the right to
purchase __________ shares (the "Shares") of common stock, $.001 par value (the
"Common Stock") of KFx Inc. (the "Company") covered by the Common Stock Purchase
Warrant dated ____________, ____ (the "Warrant") and herewith makes payment of
the purchase price of such Shares in accordance with the terms of the Warrant.
The undersigned requests a certificate for such Shares to be registered in the
name of ________________, whose address is __________________. If said number of
Shares is less than all of the Shares issuable under the Warrant, the
undersigned further requests that a new warrant representing the right to
acquire the remaining balance of the Shares to be registered in the name , whose
address is ________________________.

        The undersigned hereby represents and warrants that:

               (a) the Shares have not been registered under the Securities Act
        of 1933, as amended (the "Act") or any state securities laws,

               (b) the Shares (unless such Shares are registered under the Act
        and applicable state securities laws) are being and will be issued
        pursuant to an exemption from registration for nonpublic offerings or
        offerings to one or more accredited investors,

               (c) he is acquiring the Shares (unless such Shares are registered
        under the Act and applicable state securities laws) for his own account
        and not with a view toward their distribution,

               (d) he is experienced in making investments of this nature and
        has the necessary sophistication to be able to evaluate the merits of
        this investment, and

               (e) he will not sell, offer for sale, pledge or otherwise
        hypothecate the Shares (unless such Shares are registered under the Act
        and applicable state securities laws) in the absence of an opinion of
        counsel reasonably acceptable to the Company, that the sale, offer for
        sale, pledge or hypothecation of the Shares is exempt from the
        registration and prospectus delivery requirements of the Act and
        applicable state securities laws.

                                       1
<PAGE>

               (f) the Shares are being acquired in accordance with and subject
        to the terms, provisions and conditions of the Warrant, to all of which
        he hereby expressly assent.

                                            Very truly yours,

                                            ____________________________

                             Print Name:    ____________________________

                             Address:       ____________________________

                                            ____________________________

Receipt of the above is hereby acknowledged:

KFx Inc.

By:     ________________________

Title:  ________________________

Date:   ________________________

                                       2
<PAGE>

                                   ASSIGNMENT
                                   ----------

        FOR VALUE RECEIVED ______________________________________ hereby sells,
assigns and transfers unto _______________________________________ the within
Warrant and all rights evidenced thereby and does irrevocably constitute and
appoint, __________________ _____________________ as attorney-in-fact, to
transfer the said Warrant on the books of the within named Company.

Dated: _____________________________

                               PARTIAL ASSIGNMENT
                               ------------------

        FOR VALUE RECEIVED ________________________________________ hereby
sells, assigns and transfers unto ________________________________________ that
portion of the within Warrant and the rights evidenced thereby which will on the
date hereof entitle the holder to purchase ____________ shares of Common Stock
of _______________________________, irrevocably constitute and appoint
_____________________________, attorney-in-fact, to transfer that part of the
said Warrant on the books of the within named Company.

Dated: _____________________________<PAGE>

EXHIBIT 10.1

                            COMMON STOCK AND WARRANT

                               PURCHASE AGREEMENT

                                     between

                                    KFX, INC.

                                       and

                                BAYOU FUND, LLC.

                            dated as of July 16, 2001
<PAGE>

                                TABLE OF CONTENTS

                                                                            Page
                                                                            ----

1.   DEFINITIONS...............................................................1

        1.1.   Certain Definitions.............................................1
        1.2.   Other Terms.....................................................1

2.   AUTHORIZATION AND SALE OF SECURITIES......................................2

        2.1.   Authorization...................................................2
        2.2.   Sale of Common Stock and Warrant................................2

3.   CLOSING...................................................................2

4.   REPRESENTATIONS AND WARRANTIES OF THE COMPANY.............................2

        4.1.   Organization and Standing.......................................2
        4.2.   Corporate Power.................................................2
        4.3.   Authorization...................................................2
        4.4.   Capitalization..................................................2

5.   INVESTMENT REPRESENTATIONS................................................3

        5.1.   Accredited Investor; Experience; Risk...........................3
        5.2.   Investment......................................................3
        5.3.   Restricted Securities; Rule 144.................................3
        5.4.   Authorization...................................................4
        5.5.   Further Limitations on Disposition..............................4
        5.6.   Company Information.............................................5
        5.7.   Legends.........................................................5

6.   CONDITIONS TO THE OBLIGATIONS OF THE INVESTORS............................5

        6.1.   Representations and Warranties Correct..........................5
        6.2.   Warrant and Registration Rights Agreement.......................5
        6.3.   Covenants.......................................................5

                                                                               i
<PAGE>

7.   CONDITIONS TO COMPANY'S OBLIGATIONS.......................................5

        7.1.   Representations Correct.........................................5
        7.2.   Payment in Collected Funds......................................6

8.   MISCELLANEOUS.............................................................6

        8.1.   Governing Law...................................................6
        8.2.   Survival........................................................6
        8.3.   Successors and Assigns..........................................6
        8.4.   Entire Agreement; Amendment.....................................6
        8.5.   Notices.........................................................6
        8.6.   Delay or Omissions..............................................7
        8.7.   Counterparts....................................................7
        8.8.   Severability....................................................7

                                                                              ii
<PAGE>

           COMMON STOCK AND WARRANT PURCHASE AGREEMENT, dated as of July 16,
2001 (the "Agreement"), between KFX, INC., a Delaware corporation (the
"Company"), and BAYOU FUND, LLC a New York limited liability company (the
"Investor").

           In consideration of the mutual promises, covenants and conditions
hereinafter set forth, the parties hereto mutually agree as follows:

1. DEFINITIONS

1.1. Certain Definitions. As used in this Agreement, the following terms shall
have the meanings set forth in this Section 1.1:

       1.1.1. "Closing" shall have the meaning specified in Section 3 of this
       Agreement.

       1.1.2. "Closing Date" shall have the meaning specified in Section 3 of
       this Agreement.

       1.1.3. "Commission" shall mean the Securities and Exchange Commission or
       any other federal agency at the time administering the Securities Act.

       1.1.4. "Common Shares" shall have the meaning given in Section 2.1.

       1.1.5. "Common Stock" shall mean the common stock of the company, $.001
       par value per share.

       1.1.6. "Registration Rights Agreement" shall mean the registration rights
       agreement substantially in the form of the proposed registration rights
       agreement between the Company and the Investor, a copy of which is
       attached hereto as Exhibit A.

       1.1.7 "Securities" has the meaning given in Section 4.3

       1.1.7. "Securities Act" shall mean the Securities Act of 1933, as
       amended, and the rules and regulations of the Commission promulgated
       thereunder, all as the same shall be in effect at the time.

       1.1.8. "Warrant" shall mean warrants #BF-1 and #BF-2 issued to the
       Investor, each exercisable for 250,000 shares of Common Stock at an
       exercise price of $3.65 per share, copies of which are attached hereto as
       Exhibit B.

1.2 Other Terms. Other terms used in this Agreement are defined in the context
in which they are used and shall have the meanings therein indicated.
<PAGE>

2. AUTHORIZATION AND SALE OF SECURITIES

2.1 Authorization. Prior to the Closing, the Company shall have authorized the
sale and issuance of up to 1,000,000 shares of Common Stock (the "Common
Shares"), the Warrant and shall have reserved the 500,000 shares of Common Stock
issuable upon exercise of the Warrant.

2.2 Sale of Common Stock and the Warrant. On the basis of the representations,
warranties and agreements contained herein, and subject to the terms and
conditions hereof, at the Closing the Company shall issue and sell to the
Investor, and the Investor shall purchase from the Company, (i) 1,000,000 shares
of Common Stock and, (ii) the Warrant, for an aggregate consideration of
$3,650,000.00 (the "Purchase Price").

3. CLOSING

        The closing of the purchase and sale of the Common Stock and the Warrant
being purchased by the Investor hereunder (the "Closing") shall be held at
Stamford, Connecticut, at 10:00 a.m. on July 16, 2001 or at such other time and
place as the Company and the Investor mutually agree (the "Closing Date"). At
the Closing, the Company shall deliver to the Investor certificates representing
the Common Shares and the Warrant being purchased by the Investor against
payment of the Purchase Price by wire transfer to an account designated by the
Company in a written notice to the Investor prior to the Closing.

4. REPRESENTATIONS AND WARRANTIES OF THE COMPANY

        The Company hereby represents and warrants to the Investor as follows:

4.1 Organization and Standing. The Company is a corporation duly organized,
validly existing, and in good standing under the laws of the State of Delaware.

4.2 Corporate Power. The Company has all requisite legal and corporate power and
authority to execute and deliver this Agreement and the Registration Rights
Agreement, to sell and issue the Common Shares and the Warrant and to carry out
and perform its obligations under the terms of this Agreement, the Registration
Rights Agreement and the Warrant.

4.3 Authorization. All corporate action on the part of the Company, its
directors and stockholders necessary for the sale and issuance of the Common
Shares, the Warrant and the shares of Common Stock issuable upon exercise
thereof (together, the "Securities") and the execution, delivery and performance
of the Company*s obligations under this Agreement, the Registration Rights
Agreement and the Warrant and the reservation of the shares of Common Stock
issuable upon exercise of the Warrant have been duly taken.

4.4 Capitalization. As of June 30, 2001, the authorized capital stock of the
Company consisted of 80,000,000 shares of Common Stock, 25,710,505 shares of
which were issued and outstanding and 20,000,000 shares of preferred stock, par
value $.001 per share, none of which

                                       2
<PAGE>

were issued and outstanding. In addition, $13,860,000 of the Company's 6%
Convertible Debentures maturing July 31, 2002 (the "Debentures"), was issued and
outstanding. Upon conversion the issued and outstanding Debentures would be
convertible into 3,797,260 shares of Company's Common Stock, and the number of
shares of Common Stock have been reserved for that purpose. All issued and
outstanding shares of Common Stock have been duly authorized and validly issued,
fully paid and non-assessable and issued in compliance with all applicable
federal and state securities laws. The Company has reserved 500,000 shares of
its Common Stock for issuance upon exercise of the Warrant. Shares of Common
Stock reserved for issuance to employees, directors and officers of, and
consultants to, the Company pursuant to the Company*s benefit and other plans
are set forth in Schedule 1 hereto. The only other outstanding rights, options,
warrants, conversion rights or agreements for the purchase or acquisition from
the Company of any shares of the capital stock or other securities of the
Company are also set forth on Schedule 1 hereto. There are no preemptive rights
for the Company's Common Stock.

5. INVESTMENT REPRESENTATIONS

        The Investor hereby represents and warrants to the Company, as of the
Closing Date, as follows:

5.1 Accredited Investor; Experience; Risk. The Investor is an "accredited
investor" as such term is defined in Regulation D promulgated under the
Securities Act and has not been organized for the specific purpose of acquiring
the Common Shares or the Warrant. The Investor and its representatives have been
solely responsible for the Investor's own "due diligence" investigations of the
Company and its management and business, for its own analysis of the merits and
risks of the investment, and for its own analysis of the fairness and
desirability of the terms of the investment. The Investor has such knowledge and
experience in financial and business matters that it is capable of evaluating
the merits and risks associated with the purchase of the Common Shares and the
Warrant and of protecting its interests in connection therewith. The Investor is
able to fend for itself in the transactions contemplated by this Agreement and
has the ability to bear the economic risk of the investment, including complete
loss of the investment. The Investor is experienced in evaluating and investing
in relatively early-stage, energy technology companies such as the Company.

5.2 Investment. The Investor is acquiring the Common Shares and the Warrant for
investment for its own account and not with a view to, or for resale in
connection with, any distribution thereof, and it has no present intention of
selling or distributing the Securities. The Investor understands that the
Securities have not been registered under the Securities Act by reason of a
specific exemption from the registration provisions of the Securities Act which
depends upon, among other things, the bona fide nature of the investment intent
as expressed herein.

5.3 Restricted Securities; Rule 144. The Investor understands that the
Securities are characterized as "restricted securities" under the federal
securities laws inasmuch as they are

                                       3
<PAGE>

being acquired from the Company in a transaction not involving a public offering
and that under such laws and applicable regulations the Securities may be resold
without registration under the Securities Act only in certain limited
circumstances. The Investor acknowledges that the Securities must be held
indefinitely unless subsequently registered under the Securities Act or an
exemption from such registration is available. The Investor is aware of the
provisions of Rule 144 promulgated under the Securities Act, which permit
limited resale of shares purchased in a private placement subject to the
satisfaction of certain conditions, including, among other things, the existence
of a public market for the shares, the availability of certain current public
information about the Company, the resale occurring not less than one (1) year
after a party has purchased and paid for the security to be sold, the sale being
effected through a "broker's transaction" or in transactions directly with a
"market maker" (as provided by Rule 144(f)) and the number of shares being sold
during any three (3) month period not exceeding specified limitations.

5.4 Authorization. The Investor represents that it has the full right, power and
authority to enter into and perform its obligations under this Agreement and the
Registration Rights Agreement, and that this Agreement and the Registration
Rights Agreement when executed and delivered by the Investor will constitute
valid and binding obligations of the Investor, enforceable in accordance with
their terms, subject to the laws of general application relating to bankruptcy,
insolvency and the relief of debtors, rules of law governing specific
performance, injunctive relief or other equitable remedies.

5.5 Further Limitations on Disposition. Without in any way limiting the
representations set forth above, the Investor further agrees not to make any
disposition of all or any portion of the Securities unless and until either:

                     (a) There is then in effect a registration statement under
                     the Securities Act covering such proposed disposition and
                     such disposition is made in accordance with such
                     registration statement and the provisions of Section 5.3
                     hereof; or

                     (b) The Investor shall have notified the Company of the
                     proposed disposition and shall have furnished the Company
                     with a detailed statement of the circumstances surrounding
                     the proposed disposition. If, in the good faith
                     determination of the counsel of the Company, there is a
                     reasonable basis for the belief that such disposition would
                     require registration under the Securities Act, the Company
                     may require that Investor furnish the Company with an
                     opinion of counsel, reasonably satisfactory to the Company,
                     that such disposition will not require registration under
                     the Securities Act.

5.6 Company Information. The Investor has had an opportunity to discuss the
Company's business, management and financial affairs with directors, officers
and management of the Company. The Investor has also had the opportunity to ask
questions of, and receive answers from, the Company and its management regarding
the terms and conditions of this investment.

                                       4
<PAGE>

5.7 Legends. It is understood that each certificate representing the Securities
shall bear a legend in the following form or substantially similar form (in
addition to any legend required under applicable state securities laws):

                     "THESE SECURITIES HAVE NOT BEEN REGISTERED UNDER THE
                     SECURITIES ACT OF 1933 (THE "SECURITIES ACT"), OR ANY
                     APPLICABLE STATE SECURITIES LAW AND HAVE BEEN ACQUIRED FOR
                     INVESTMENT AND NOT WITH A VIEW TO, OR IN CONNECTION WITH,
                     THE SALE OR DISTRIBUTION THEREOF. NO SUCH SALE OR
                     DISPOSITION MAY BE EFFECTED WITHOUT (A) AN EFFECTIVE
                     REGISTRATION STATEMENT RELATED THERETO OR (B) AN EXEMPTION
                     FROM THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT
                     AND ANY APPLICABLE STATE SECURITIES LAWS."

6. CONDITIONS TO THE OBLIGATIONS OF THE INVESTOR

        The obligations of the Investor to purchase the Common Stock and the
Warrant at the Closing are subject to the fulfillment on or prior to the Closing
Date of all of the conditions set forth below in this Section 6.

6.1 Representations and Warranties Correct. The representations and warranties
made in Section 4 hereof shall be true and correct in all material respects when
made, and shall be true and correct in all material respects on and as of the
Closing Date with the same force and effect as if they had been made on and as
of the Closing Date.

6.2 Warrant and Registration Rights Agreements. The Company shall execute and
deliver the Registration Rights Agreement and the Warrant.

6.3 Covenants. All covenants, agreements and conditions contained in this
Agreement to be performed by the Company on or prior to the Closing Date shall
have been performed or complied with in all material respects.

7. CONDITIONS TO COMPANY'S OBLIGATIONS

        The Company*s obligation to sell the Common Shares and the Warrant to
the Investor at the Closing is subject to the fulfillment of the following
conditions:

7.1 Representations Correct. The representations made by such Investor in
Section 6 hereof shall be true and correct in all material respects when made,
and shall be true and correct in all material respects on the Closing Date with
the same force and effect as if they had been made on the Closing Date.

                                       5
<PAGE>

7.2 Payment in Collected Funds. The Company has received $3,650,000.00 from
Investor by bank wire transfer as payment for the Shares in accordance with wire
transfer instructions provided prior to Closing.

8. MISCELLANEOUS

8.1 Governing Law. This Agreement shall be governed in all respects by the laws
of the State of New York.

8.2 Survival. The representations, warranties, covenants and agreements made in
Sections 4 and 5 hereof shall not survive the Closing, except for the covenants
of the Investor in Section 5.5, which shall survive for a period of two years
from the Closing Date.

8.3 Successors and Assigns. Except as otherwise provided herein, the provisions
hereof shall inure to the benefit of, and be binding upon, the successors,
assigns, heirs, executors and administrators of the parties hereto.

8.4 Entire Agreement; Amendment. This Agreement and the other documents
delivered pursuant hereto constitute the full and entire understanding and
agreement between the parties with regard to the subjects hereof and thereof and
supersede and preempt any prior understandings, agreements or representations by
or among the parties, written or oral, which may have related to the subject
matter hereof in any way, including, without limitation, any summary of terms or
similar agreement. Neither this Agreement nor any term hereof may be amended,
waived, discharged or terminated other than by a written instrument signed by
the Company and the Investor.

8.5 Notices, etc. Any notice required or permitted pursuant to this Agreement
shall be in writing and shall be deemed sufficient (i) immediately when
delivered personally or by facsimile, (ii) twenty (20) hours after being
deposited with an overnight courier service (e.g. Federal Express) for next day
delivery, or (iii) forty-eight (48) hours after being deposited in the U.S.
mail, as certified or registered mail, with postage prepaid, addressed as
follows:

           If to the Investor:

           Bayou Fund, LLC.
           40 Signal Road
           Stamford, CT 06902

           Phone:     203-324-0333
           Facsimile: 203-316-8820

           with a copy to:

                                       6
<PAGE>

           If to the Company:

           KFx Inc.
           3300 East First Avenue, Suite 290
           Denver, CO 80206

           Phone:     303-293-2992
           Facsimile: 303-293-8430

           Attention: CEO

8.6 Delays or Omissions. No delay or omission to exercise any right, power or
remedy accruing to the Investor, upon any breach or default of the Company under
this Agreement, shall impair any such right, power or remedy of the Investor nor
shall it be construed to be a waiver of any such breach or default, or an
acquiescence therein, or of or in any similar breach or default thereafter
occurring; nor shall any waiver of any single breach or default be deemed a
waiver of any other breach or default theretofore or thereafter occurring. Any
waiver, permit, consent or approval of any kind or character on the part of the
Investor of any breach or default under this Agreement, or any waiver on the
part of any holder of any provisions or conditions of this Agreement, must be in
writing and shall be effective only to the extent specifically set forth in such
writing. All remedies, either under this Agreement or by law or otherwise
afforded to the Investor, shall be cumulative and not alternative.

8.7 Counterparts. This Agreement may be executed in any number of counterparts,
each of which shall be enforceable against the parties actually executing such
counterparts, and all of which together shall constitute one instrument.

8.8 Severability. In the event that any provision of this Agreement becomes or
is declared by a court of competent jurisdiction to be illegal, unenforceable or
void, this Agreement shall continue in full force and effect without said
provision; provided, however, that no such severability shall be effective if it
materially changes the economic benefit of this Agreement to any party.

                                       7
<PAGE>

         IN WITNESS WHEREOF, the parties hereto have duly executed this Common
Stock and War rant Purchase Agreement, or have caused this Common Stock and
Warrant Purchase Agreement to be fully executed on their behalf as of the date
first set forth above.

                                       KFX, INC.

                                       By:       ______________________

                                       Name:     Theodore Venners
                                       Title:    Chairman & CEO

                                       BAYOU FUND, LLC

                                       By:       ______________________

                                       Name:     ______________________

                                       Title:    ______________________

                                       8
<PAGE>

                                   EXHIBIT A
                                   ---------

                          Registration Rights Agreement

                                    Attached.
<PAGE>

                                    EXHIBIT B
                                    ---------

                                    Warrants

                                  BF-1 and BF-2

                                    Attached.
<PAGE>

                                   SCHEDULE 1
                                   ----------

<TABLE>
<CAPTION>

Stock Option Plans:
-------------------

           Plan Name                                                                 Shares Reserved
           ---------                                                                 ---------------

<S>        <C>                                                                           <C>
           Amended & Restated 1992 Stock Option Plan                                     1,000,000
           1996 Stock Option & Incentive Plan                                            1,500,000
           1999 Stock Incentive Plan                                                     2,000,000
           1998 Advisory Committee Stock Option Plan                                       100,000
           1998 Directors Stock Option Plan                                                200,000

Non-Plan Stock Options:
-----------------------

           Kurt B. Eckrich                Expires 6/17/05                                  500,000
           Kurt B. Eckrich                Expires 1/01/06                                  150,000
           Kurt B. Eckrich                Expires 1/01/07                                  150,000
           Kurt B. Eckrich                Expires 1/01/08                                  150,000
           Seth L. Patterson              Expires 10/01/05                                 250,000

Warrants:
---------

           Innovative Research            Expires 8/03/01                                    55,000
           BlueStone Capital              Expires 7/31/02                                   253,333
           Jefferies International        Expires 7/31/02                                   200,000
           Peter K. Martin                Expires 8/02/01                                    75,000
           Landrica Development           Expires 4/30/05                                 1,300,000
           William H. Walker              Expires 3/08/06                                   166,667
           Theodore Venners               Expires 3/08/06                                    66,667
           Mark S. Sexton                 Expires 4/09/06                                    33,333
           Stanley G. Tate                Expires 5/21/06                                    14,887
           Mark S. Sexton                 Expires 5/24/06                                    33,333

Stock Plans:
------------

           Forfeitable Stock Plan for Independent Contractors                               408,000
           Vendor Stock Plan                                                                 34,957
</TABLE>

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