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Promissory Note - Harken Exploration Co. and Momentum Operating Co. Inc.

                                PROMISSORY NOTE


December 20, 1995                                     Principal:  $13,000,000.00

         For value received, the undersigned, Harken Exploration Company
('Buyer'), a Delaware corporation, promises to pay to the order of Momentum
Operating Co., Inc. ('Seller'), a Texas corporation, at  232 South Main,
Albany, in Shackelford County, Texas 76430, upon maturity hereof, as is
hereinafter defined, the principal amount of Thirteen Million Dollars
($13,000,000.00), adjusted as hereinafter provided, plus interest at the rate
of five percent (5%)  per annum accrued from the date hereof until Maturity I,
as hereinafter defined, on the fixed, unadjusted amount of Eight Million
Dollars ($8,000,000.00) only of this debt.

RECITALS:

         This Note is executed in accordance with the terms of that certain
Purchase and Sale Agreement dated as of even date herewith ('Purchase
Agreement'), by and among Buyer, Seller, and Harken Energy Corporation
('Company').

         The Company executes this Note not as a maker but only for the limited
purposes of evidencing its consent to the giving of this Note and the related
Vendor's lien and Deed of Trust by Buyer.  This vendor's lien and Deed of Trust
lien are  subordinate to the HEC Mortgage, to the extent provided in the HEC
Mortgage.

DEFINITIONS:

         PURCHASE SHARES are the Two Million Five Hundred Thousand (2,500,000)
shares of the common stock $.01 par value of the Company which are delivered to
Seller at the closing ('Closing') of the transaction of which this promissory
note ('Note') is a part.

         STOCK is the common stock $.01 par value of the Company.

         TIER ONE STOCK is that Stock which may be issued and delivered to
Seller in payment of the Eight Million Dollar ($8,000,000.00) portion of this
Note, as adjusted.

         AVERAGE CLOSING PRICE is the arithmetic mean of the daily closing
prices of a share of Stock during the specified time period as quoted on the
American Stock Exchange, Inc., and reported in the Wall Street Journal, or
other recognized publications.  There will be excluded from this calculation
any days during the specified time period(s) during which Seller was prohibited
from selling shares of Stock at the request of Buyer or Company.

Promissory Note
Page 2


         TIER ONE PRICE is the Average Closing Price used to determine the
number of shares of Tier One Stock issued at Maturity I.

         Capitalized terms used herein, unless otherwise stated in this Note,
shall have the meanings as set forth in the Purchase Agreement and in the
agreements attached as Schedules to the Purchase Agreement.

SECURITY:

         This Note is secured by a vendor's lien retained in the Assignment
from Seller to Buyer and by the Deed of Trust, which vendor's lien and Deed of
Trust are subordinated to the HEC Mortgage to the extent provided in the HEC
Mortgage.

MATURITY:

         The maturity date of this Note as to a principal amount of Eight
Million Dollars ($8,000,000.00) only,  subject to adjustments as hereinafter
provided, shall be that date which is the earlier of (i) 270 days following the
date of effectiveness of the First Registration Statement, or (ii) January 15,
1997 ('Maturity I').

         Except as provided in the second sentence of this paragraph, the
maturity date of this Note as to the remaining principal amount of Five Million
Dollars ($5,000,000.00), subject to adjustments as hereinafter provided, shall
be that date which is the earlier of (i) two hundred seventy (270) days
following the date of effectiveness of the Second Registration Statement, or
(ii)  November 15, 1997, or, alternatively, July 15, 1997 if Tier One Stock is
not issued ('Maturity II').   If, however, Buyer has (i) defaulted in the
payment due at Maturity I, (ii) cured that default by payment in Stock within
the Cure Period or Additional Cure Period defined below, and (iii) elected at
the Maturity II date calculated as provided in the preceding sentence to make
the payment due at Maturity II in Stock, then the date of Maturity II shall be
three hundred sixty five  (365) days following the date Buyer cured the
Maturity I default under the terms of this Note.

         Should the Maturity I or Maturity II date fall on a weekend, holiday
or other date on which banks located in Dallas, Texas, are closed, then in such
event the Maturity I or Maturity II date shall be the next following banking
business day.

FORM OF PAYMENT UPON MATURITIES:

         This Note is payable no later than five (5) business days following
the date of Maturity I, as to the  Eight Million Dollar ($8,000,000.00) portion
plus accrued interest as provided herein, at the election of Buyer in either
(i) cash, or (ii) except as provided below, in the number of shares of Stock
equal to the payment due divided by the Average Closing Price for the greater
of (x) the trading days during the period beginning the date which the First
Registration Statement is declared effective and ending ten (10) trading days
prior to Maturity I, or, (y) the one hundred eighty (180) trading days
preceding ten (10) trading days prior to Maturity I.

Promissory Note
Page 3


         This Note is payable no later than five (5) business days following
the date of Maturity II, as to the Five Million Dollar ($5,000,000.00) portion,
at the election of Buyer in either (i) cash, or (ii)  except as provided below,
in the number of shares of  Stock, equal to the payment due divided by the
Average Closing Price for the greater of (x) the trading days during the period
beginning the date on which the Second Registration Statement is declared
effective and ending ten (10) trading days prior to Maturity II, or, (y) the
one hundred eighty (180) trading days preceding ten (10) trading days prior to
Maturity II.   In the event the portion of this Note due at Maturity I is paid
by Buyer in cash and not Stock, then the number of shares of Stock which may
then be issued at  Maturity II shall be equal to the payment due divided by the
Average Closing Price for the one hundred eighty (180) trading days preceding
ten (10) trading days prior to the Maturity II.

         Buyer's right to elect at Maturity I or at Maturity II to make a
payment in Stock is subject to satisfaction at such time of the following
conditions:  (i) each of the representations and warranties of Buyer and
Company contained in the Purchase Agreement and in any other agreement or
instrument described in the Purchase Agreement, executed in connection with
Closing, or executed after Closing in connection therewith, is true and correct
in all material respects as of the respective maturity date, (ii) as of the
respective maturity date, neither Buyer nor Company are in material breach of
or default under the Purchase Agreement, or under any other agreement or
instrument described in the Purchase Agreement, and executed in connection with
Closing, or executed after Closing in connection therewith,  (iii) Buyer and
Company shall each have delivered to Seller a certificate executed by an
executive officer, dated as of the respective maturity date, certifying the
satisfaction of the conditions listed in (i) and (ii) above, and (iv) the
Company shall have delivered an opinion from its counsel addressed to Seller
that the shares of Stock being issued and delivered are duly and validly
issued, fully paid and non-assessable.

ADJUSTMENTS TO PRINCIPAL:

         The Principal amounts due on Maturity I and on Maturity II shall be
increased and/or decreased as appropriate for each and all of the following
adjustments ('Adjustments').  If there is a dispute between Seller and Buyer
concerning the amount or propriety of an Adjustment, Buyer shall pay the
undisputed portion of the principal payment, and interest as applicable, and
Seller and  Buyer shall submit the disputed portion to arbitration under the
terms of Section 5.8(b)(4) of the Purchase Agreement.

         AT PAYMENT OF EIGHT MILLION DOLLAR ($8,000,000.00) PORTION AT MATURITY
I:

                 A.       Seller shall calculate (i) the gross price (prior to
         deducting any commissions and other costs of sale) for which the
         Purchase Shares were sold by Seller prior to Maturity I ('Purchase
         Shares Proceeds'), and (ii) the product of Two  Dollars ($2.00) per
         share multiplied by the number of Purchase Shares sold prior to
         Maturity I ('Purchase Shares Floor Amount').  The principal payment
         then due at this Maturity I shall then either be decreased by the
         amount by which the  Purchase Shares Proceeds exceeds the Purchase
         Shares Floor Amount, or increased by the amount by which the Purchase
         Shares Floor Amount exceeds the Purchase Shares Proceeds.

                 If the Purchase Shares Floor Amount exceeds the Purchase
         Shares Proceeds and the quantity

Promissory Note
Page 4

         of Purchase Shares which Seller sold in any one or more trading days
         prior to Maturity I exceeds 25,000 shares per day (the  number of
         Purchase Shares sold over 25,000 shares per day during this term are
         hereinafter referred to as 'Excess Purchase Shares') then the portion
         of the Purchase Shares Proceeds which were derived from the sale of
         Excess Purchase Shares ('Purchase Shares Excess'), for purposes of
         calculation of this Adjustment shall be the greater of either (i) the
         Purchase Shares Excess, or ii) the Average Closing Price from the date
         on which the First Registration Statement is declared effective  until
         ten (10) trading days prior to Maturity I times the number of Excess
         Purchase Shares.

                 Subject to the  limitation contained in this paragraph, if
         less than all Purchase Shares are sold by Seller prior to Maturity I,
         then the Adjustment provided for under this section 'A' shall be
         calculated based only on the actual number of Purchase  Shares sold.
         If the First Registration Statement has not been effective for at
         least 180 trading days preceding the ten (10) trading days prior to
         Maturity I, the time for calculating the Adjustment provided for under
         this section 'A' shall be tolled until the earlier of (i) the date on
         which the First Registration Statement has been effective for at least
         180 trading days, or (ii) the date on which Seller may exercise its
         rights under Section 5.1(b) of the Deed of Trust.  If the date for
         calculating the Adjustment is determined under (ii), the principal
         payment due shall be adjusted in accordance with the first paragraph
         of this section 'A' by the difference between (x) the gross value of
         the Purchase Shares on the adjustment date as determined by agreement
         of Seller and Buyer and (y) the Purchase Shares Floor Amount.

                 B.       The principal payment due shall be increased by the
         amount by which $500,000         exceeds the Retained Proceeds defined
         in Section 2.4 of the Purchase Agreement.

                 C.       The principal payment shall be increased or
         decreased, as appropriate, by the net amount due either Seller or
         Buyer as an adjustment to the Purchase Price under Section 2.3 of the
         Purchase Agreement.

                 D.       The principal payment shall be increased by an amount
         equal to 0.02739726% of the balance remaining at the end of each
         calendar day between the Closing Date and Maturity I of (i) Five
         Million Dollars ($5,000,000) less (ii) the Purchase Shares Proceeds.
         If the time for calculating the Adjustment under section 'A' above has
         been tolled, for purposes of calculating the Adjustment under this
         section 'D', Maturity I shall be deemed to occur on the earlier of (x)
         the date on which the First Registration Statement has been effective
         for at least 180 trading days or (y) the date on which Seller may
         exercise its rights under Section 5.1(b) of the Deed of Trust.

         AT PAYMENT OF FIVE MILLION DOLLAR ($5,000,000.00) PORTION AT MATURITY
II:

                 A.       If the Tier One Stock was issued at Maturity I,
         Seller shall calculate (i) the gross price (prior to deducting
         commissions and other costs of sale), for which the shares of Tier One
         Stock were sold by Seller prior to Maturity II ('Tier One Proceeds')
         and (ii) the product of the Tier One Price multiplied by the number of
         shares of Tier One Stock sold prior to Maturity II ('Tier One Floor
         Amount').   For purposes of this paragraph and the succeeding
         paragraph, all Stock sold by

Promissory Note
Page 5

         Seller between the date the Second Registration Statement is declared
         effective and Maturity II shall be considered Tier One Stock.   The
         principal payment due shall be decreased by the amount by which the
         Tier One Proceeds exceeds the Tier One Floor Amount, or increased by
         the amount by which the Tier One Floor Amount exceeds the Tier One
         Proceeds.

                 If the Tier One Floor Amount exceeds the Tier One Proceeds and
         the quantity of Tier One  Stock which Seller sold in any one or more
         trading days prior to Maturity II exceeds  the quotient obtained by
         dividing the number of shares of Tier One Stock issued by 180 (the
         number of shares of  Tier One Stock sold over that quotient per day
         during this term are hereinafter referred to as 'Excess Tier One
         Shares'), then the portion of the Tier One Proceeds which were derived
         from the sale of Excess Tier One Shares ('Tier One Excess') for the
         purposes of the calculation of this Adjustment shall be the greater of
         either (i) the Tier One Excess or ii) the Average Closing Price from
         the date on which the Second Registration Statement is declared
         effective  until ten (10) trading days prior to Maturity II times the
         number of Excess Tier One Shares.

                 Subject to the limitation contained in this paragraph, if less
         than all Tier One Stock is  sold by Seller prior to Maturity II, then
         the Adjustment provided for under this section 'A' shall be calculated
         based only on the actual number of shares of Tier One Stock sold.
         If the Second Registration Statement has not been effective for at
         least 180 trading days preceding the ten (10) trading days prior to
         Maturity II, the time for calculating the Adjustment provided for
         under this section 'A' shall be tolled until the earlier of (i) the
         date on which the Second Registration Statement has been effective for
         at least 180 trading days, or (ii) the date on which Seller may
         exercise its rights under Section 5.1(b) of the Deed of Trust.  If the
         date for calculating the Adjustment is determined under (ii), the
         principal payment due shall be adjusted in accordance with the first
         paragraph of this  section 'A' by the difference between (x) the gross
         value of the Tier One Stock on the adjustment  date as determined by
         agreement of Seller and Buyer and (y) the Tier One Floor Amount.

                 B.       If the Tier One Stock was issued, the principal
         payment due at Maturity II shall be increased by an amount equal to
         0.02739726% of the balance remaining at the end of each calendar day
         between Maturity I and Maturity II of (i) Eight Million Dollars
         ($8,000,000) less (ii) the Tier One Proceeds.  If the time for
         calculating the Adjustment under section 'A' above has been tolled,
         for purposes of calculating the Adjustment under this section 'B',
         Maturity II shall be deemed to occur on the earlier of (x) the date on
         which the Second Registration Statement has been effective for at
         least 180 trading days, or (y) the date on which Seller may exercise
         its rights under Section 5.1(b) of the Deed of Trust.

                 C.       In the event no Tier One Stock was issued at Maturity
         I, then there shall be no Adjustments to the Five Million Dollar
         ($5,000,000) principal payment due at Maturity II.

Promissory Note
Page 6

MAXIMUM AMOUNT OF INTEREST:

         Seller and Buyer intend to conform strictly to state and federal usury
laws applicable to payment of this Note.  Notwithstanding any provisions to the
contrary in this Note, the aggregate of all interest and any other charges
constituting interest under applicable law which are contracted for, charged or
received under this Note, or otherwise, shall not exceed the maximum amount of
interest permitted by the then applicable law of the State of Texas, or the
United States of America, whichever is greater.   If applicable law provides
for an interest ceiling under TEX. REV.  CIV. STAT. ANN art. 5069-1.04
(Vernon), as amended, the ceiling shall be the 'indicated rate ceiling'.  If
any interest in excess of the maximum amount of interest permitted by law is
contacted for, charged or received (a) the provisions of this paragraph shall
control, (b) neither Buyer nor Buyer's successors, legal representatives or
assigns or any other party liable for the payment of this Note shall be
obligated to pay the amount of such interest that is in excess of the maximum
permitted by law, (c) any excess shall be deemed a mistake and canceled
automatically and if already paid, shall, at the option of the holder of this
Note be refunded to Buyer or credited on the principal amount of this Note, and
(d) the effective rate of interest shall be automatically reduced to the
maximum rate permitted by applicable law.  In determining whether the interest
contracted for, charged or received exceeds the maximum amount of interest
permitted by law, all interest contracted for, charged or received shall be
amortized, prorated, allocated and spread throughout the full stated terms of
this Note, and any renewals or extensions, in accordance with the amounts
outstanding from time to time and the maximum legal rate of interest from time
to time in effect under applicable law.

PREPAYMENT:

         Each of the principal payments due at Maturity I and Maturity II, as
adjusted, may be prepaid in whole, together with accrued interest if
applicable, at any time without penalty.   Except as permitted in Section
4.1(h) of the Deed of Trust, Buyer does not have the right to make partial
prepayments. The date Seller receives the final payment of all principal due
shall be deemed to be Maturity I or Maturity II, as the case may be.

CURE PERIOD.

         Except with respect to events of Default described in Sections 4.1(e),
(f), and (g) of the Deed of Trust, upon the occurrence of  any other event
which would constitute an event of  Default either under this Note, or under
the Deed of Trust ('Event'), Buyer shall have thirty (30) calendar days (the
'Cure Period') in which to cure such Event without penalty other than the
continuation of applicable interest, as provided for under this Note, before
Seller may exercise its rights and remedies permitted by the Deed of Trust.
Upon the termination of such Cure Period if such Event shall then be continuing
and not remedied, Buyer may at its option further elect to extend the Cure
Period for up to an additional 365 days (the 'Additional Cure Period') during
which the Event shall not constitute an event of Default.  Buyer shall exercise
this election by giving Seller written notice on or before the end of the Cure
Period describing the Event and designating the number of days Buyer elects to
include in the Additional Cure Period.   Buyer may elect to extend an
Additional Cure Period in the same manner.  The sum of all days in all
Additional Cure Periods  shall not exceed 365 days through the entire term of
this Note.  If the Event is Buyer's failure to pay the amount due

Promissory Note
Page 7

at Maturity I or Maturity II,  Buyer may make the payment due during the Cure
Period or the Additional Cure Period by paying the amount due, together with
the interest and any other amount due as a result of the occurrence of such
Event in the form, either cash or Stock, which Buyer could have elected at
either Maturity I or Maturity II.  If Buyer elects to make such payment in
Stock, the number of shares issued shall be equal to the payment due divided by
the Average Closing Price for one hundred eighty (180) trading days preceding
ten (10) trading days prior to the date on which the payment is made.   During
any Additional Cure Period and so long as the Event remains uncured Seller
shall have the right and option to exercise any or all of its rights and
remedies permitted by the Deed of Trust.

DEFAULT:

         At the end of a Cure Period  or the Additional Cure Period(s),  if
Buyer  has failed to  cure the Event, the Event shall be deemed a Default under
this Note and the Deed of Trust and Seller may declare the remaining entirety
of this Note including, principal and interest, immediately due and payable in
cash and exercise all the rights, at law or in equity, as provided for under
the terms of this Note or under any instrument executed in connection with, or
as security for this Note.

          Seller's failure to exercise such rights at any time shall not
constitute a waiver of Seller's right to do so at any other time.

         Subject to the terms and provision of this Note and of the Deed of
Trust, Buyer and all other parties now or later liable for the payment of this
Note in whole or in part, (i) waive demand, presentment for payment, notice  of
nonpayment, protest, notice of protest,  notice of intent to accelerate, notice
of acceleration and all other notice, filing of suit and diligence in
collecting this Note or enforcing any security;  (ii) agree to any
substitution, subordination, exchange or release of any security or release of
any party primarily or secondarily liable for payment of this Note or to
enforce Seller's rights against them or any security; (iii) agree that Seller
shall not be required first to institute suit or exhaust its remedies against
Buyer or others liable or to become liable for payment of this Note or to
enforce Seller's rights against them or any security;  and (iv) consent to any
extension or postponement of time of payment of this Note and to any other
indulgence with respect to this Note without notice to Buyer or to any person
liable for payment of this Note.

         If Default occurs in the payment of this Note, or this Note is
collected or enforced through probate, bankruptcy or other proceedings, Buyer
promises to pay all reasonable costs and expenses of collection and
enforcement.  If this Note is placed with an attorney for collection or
enforcement, Buyer promises to pay Seller's reasonable attorney's fees, in
addition to all other costs of collection and enforcement.  Interest on  past
due principal and, to the extent permitted by law, on past due interest, shall
accrue at the rate of seven percent (7%) per annum from the date due until
paid.  Interest shall accrue during a Cure Period or Additional Cure Period.

DISCLAIMER OF ORAL AGREEMENTS:

         The Parties warrant and represent that the entire agreement made
between the Parties is contained within the executed documents, as amended and
supplemented hereby, and that no agreements or promises

Promissory Note
Page 8

exist between the parties, that are not reflected in the language of the
various documents executed in conjunction with this transaction.

         This  Note, and the Purchase Agreement represents the final agreement
between the Parties and may not be contradicted by evidence of prior,
contemporaneous, or subsequent oral agreements between the Parties.   There are
no unwritten oral agreements between the Parties.

         THIS NOTE IS INTENDED TO BE PERFORMED IN SHACKELFORD COUNTY, IN THE
STATE OF TEXAS AND SHALL BE CONSTRUED AND ENFORCED IN ACCORDANCE WITH THE LAWS
FOR SUCH STATE (WITHOUT GIVING EFFECT TO ANY RULES OF LAW WHICH MIGHT REQUIRE
APPLICATION OF THE LAW OF ANOTHER JURISDICTION), EXCEPT TO THE EXTENT THE SAME
IS GOVERNED BY APPLICABLE FEDERAL LAW.

                             HARKEN EXPLORATION COMPANY
                        
                        
                        
                        
                             By: /s/  Richard H. Schroeder
                                 ---------------------------------------
                                      Richard H. Schroeder, President
                        
                        
                             EXECUTED FOR THE LIMITED PURPOSES AS STATED ABOVE:
                        
                             HARKEN ENERGY CORPORATION
                        
                        
                        
                        
                             By: /s/  Richard H. Schroeder
                                 ---------------------------------------
                                      Richard H. Schroeder, President


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