EXHIBIT 10.4






                           CONVERTIBLE PROMISSORY NOTE


Lender:     Frank Bingham
            1954 S. Lafayette St.
            Denver, CO 80210

Borrower:         Natural Resource Group, Inc.
            1789 W. Littleton Blvd.
            Littleton, CO 80120

 Principal Amount: $70,000.00

 Date of Issuance: May 18, 2012

 Maturity Date: May 31, 2014

1. Principal and Interest.

     1.1  Principal  Draws.  The Principal Amount is made available by Lender to
          Borrower in two draws. The initial draw extended upon issuance of this
          Note  is  $35,000.  One  additional  draw  of  $35,000  shall  be made
          available to Borrower on or before May 31, 2012

     1.2  Promise to Repay.  Borrower  hereby  promises to repay to the order of
          Lender the Principal  drawn pursuant to paragraph 1.1 at the place and
          in the manner hereinafter provided,  together with interest thereon at
          the rates described  below, and any and all other amounts which may be
          due and payable hereunder.

     1.3  Maturity  Date.  This Note shall  mature,  and all sums  remaining due
          hereunder  shall be due and payable in full,  on the Maturity Date set
          forth above.

     1.4  Interest.  Interest on the Principal shall accrue at a rate of 10% per
          annum on principal sums drawn by Borrower.

     1.5  Interest Payment.  Borrower shall pay to Lender the interest described
          in paragraph 1.4,  above,  monthly.  All interest  accrued through the
          last day of each month  shall be paid by  Borrower  and  delivered  to
          Lender not later than the 5th day of the following month.

     1.6  Place of Payment The  Principal  and Interest  shall be payable at the
          address of Lender  set forth at the head of this  Note.  Lender may by
          written notice to Borrower designate a different place of payment.

     1.7  Principal  Payment.  The entire principal  balance shall be due at the
          Maturity Date.

     1.8  Surrender  Upon  Payment.  Upon payment in full of the  Principal  and
          Interest  hereunder  this  Note  shall be  surrendered  by  Lender  to
          Borrower for cancelation.

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     2.   Purpose. The purpose of this extension of credit is to provide funding
          for Borrower's  development operations in the Garcia Field, Las Animas
          County,  Colorado.  Borrower  shall use the funds provided for in this
          Note to advance the  operations in the Garcia Field.  Such  operations
          shall be conducted in the sole  discretion of the Borrower,  acting in
          good faith.  Borrower makes no guarantee of any kind about the success
          or failure of any such operations.

     3.   Security.  Borrower  hereby  grants to Lender,  and this Note shall be
          secured by, a second  priority  Deed of Trust,  Mortgage  and Security
          Agreement,  together with UCC financing  statements,  covering the Oil
          and Gas Leases described in Exhibit "A" attached hereto, together with
          the wells,  casing,  piping,  pumps, motors,  jacks, tanks,  gathering
          lines,  pipe lines and all other oil and gas field  equipment  located
          thereon and used in connection therewith, and the oil and gas produced
          therefrom,  whether now owned or  hereafter  acquired,  additions  and
          accessions  thereto,  the proceeds  therefrom  and  products  thereof.
          Further,  Borrower  hereby  grants to  Lender,  and this Note shall be
          secured by, a first  priority  Deed of Trust,  Mortgage  and  Security
          Agreement,  covering the assets listed on Exhibit B.  Collectively the
          assets  described  above  and  listed  on  Exhibits  A and B shall  be
          referred to as the "Collateral". The Parties understand and agree that
          the  security  shall not  include  any  property or assets of Borrower
          except for the Collateral. In the event of any sale by Borrower of the
          Collateral, or Borrower's working interest in the Collateral, the Deed
          of Trust,  Mortgage and Security Agreement shall continue in force and
          remain a lien  against  the  Collateral,  unless this Note is paid and
          discharged  in full.  The Parties  hereby agree that the proceeds from
          any such sale  shall be due to Lender in (a) an amount  sufficient  to
          satisfy  all  Principal,  Interest  and such  other sums as may be due
          Lender as hereinafter  provided, or (b) the entire amount of the sale,
          whichever  is less.  It is the  Parties  intent that this Note and the
          Deed of Trust,  Mortgage and Security  Agreement shall be binding upon
          any successor or assign of Borrower with respect to the Collateral.

     4.   Election to Convert.  Lender shall have the right, at any point during
          the life of this Note, to convert the then remaining Principal balance
          to (a) a 2% Working  Interest in the Collateral,  or (b) 70,000 shares
          of Common Stock in Natural Resource Group, Inc. Lender shall make such
          election by giving written notice to Borrower. Within ten (10) days of
          receiving  such notice,  Borrower shall execute and deliver to Lender,
          all necessary  documents and assignments to effect Lender's  election.
          Upon  conversion  to a working  interest  owner,  the Lender agrees to
          become a party to any  existing  Operating  or  Accounting  agreements
          which apply to the  Collateral.  If no such  Operating  or  Accounting
          agreements  exist,  the  parties  shall  enter  in a  Joint  Operating
          Agreement   designating   Assignor  (its  successors  or  assigns)  as
          "Operator"  for the mutual  interest of the working  interest  owners,
          such Operating  Agreement to be  substantially in the form of the then
          most recent  version of AAPL Form 610 Joint  Operating  Agreement with
          COP AS Accounting  Procedures for Onshore  Operations.  Interest shall
          continue to accrue  (payable  monthly by Borrower as herein  provided)
          until:  (i) the Joint Operating  Agreement is executed,  and the first
          day of the month within which  Borrower has  delivered  and recorded a
          good and  sufficient  Assignment  and  Bill of Sale to the 2%  working
          interest and such Assignment and Bill of Sale is made effective (i.e.,
          Lender entitled to its proportionate share of revenue,  subject to its
          share of operating  expense).  In the event the election to convert is
          made by Lender at a time when less than the Principal Amount ($70,000)
          is due and owing,  then the working  interest  into which Lender shall
          convert  shall be  reduced  proportionately  (e.g.,  if the  Principal
          amount then  outstanding is $35,000,  then Lender shall be entitled to
          convert into a 1% working interest).

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     5.   Event of Default.  The  occurrence of any one or more of the following
          events shall constitute an Event of Default:

               a.   Borrower fails make any payment of Interest or Principal due
                    hereunder,  and such failure shall remain  unremedied  for a
                    period of five (5) business days; and

               b.   Lender shall fail to timely  advance  funds  pursuant to the
                    terms of this Note, unless Borrower has failed to conform to
                    the purposes of this Note.

     6.   Prepayment.  Borrower  may  prepay  the Note at any time  prior to the
          Maturity Date, in whole or in part,  without any penalty or fee of any
          sort. Prior to prepaying the Note,  Borrower shall give written notice
          to Lender of its intent to prepay. Upon receiving such notice,  Lender
          shall have ten (10) days to provide  Borrower  with written  notice of
          its intent to convert the Principal to a working  interest as provided
          in paragraph 4, above.  If Lender does not send written  notice of its
          election to convert,  then Lender's  right to convert shall expire and
          Borrower may terminate the Note by repaying the Principal.

     7.   Failure to Pay on or Before the Maturity  Date.  If Borrower  fails to
          pay the Principal due on this Note  contemporaneously with or prior to
          the Maturity  Date,  and such failure is not remedied  within 30 days,
          the following shall apply:

               a.   Lender  shall  be  entitled  to seek  and  obtain  an  order
                    appointing  Receiver  of  the  Collateral  for  purposes  of
                    protecting,   preserving,   operating  and  maintaining  the
                    Collateral.

               b.   Lender  shall  have a Power  of Sale  concerning  all of the
                    Collateral.  Power of sale shall mean that Lender shall have
                    the  right  to sell  and  convey  all or part of  Borrower's
                    working interest in the Collateral. Lender shall endeavor in
                    good faith to obtain  market  value for  Borrower's  working
                    interest in the Collateral,  but if the sale is conducted by
                    judicial means (judicial  foreclosure,  receiver's  sale, or
                    other proceedings before a Court of competent  jurisdiction)
                    the sole procedures authorized by such Court shall be deemed
                    to satisfy  the  Lender's  obligations  under the  preceding
                    sentence. Lender shall apply the proceeds of any sale to the
                    Principal and Interest on this Note, as well as the costs of
                    any sale (subject to the  limitations on attorney's fees set
                    forth in paragraph S, below).  Any  remaining  proceeds from
                    the sale after satisfaction of Principal, Interest and costs
                    shall be tendered to Borrower.  Any deficiency  shall remain
                    due from Borrower.

               c.   As an alternative to the remedy  described in such paragraph
                    7b, above,  Lender shall have the right to the assignment of
                    5% of Borrower's ownership interest in the Collateral.  This
                    right may be enforced by specific  performance in a court of
                    law. Such 5% ownership  interest shall be assigned to Lender
                    by good and sufficient  Assignment and Bill of Sale, and the
                    parties  shall  enter  into  a  mutually   acceptable  Joint
                    Operating  Agreement  and COP AS accounting  procedures  (as
                    provided in paragraph 4, above) naming a mutually acceptable
                    operator.  Upon  the  assignment  of  5%  of  its  ownership
                    interest in the Collateral by Borrower to Lender,  this Note
                    shall   terminate,   and  Borrower  shall  have  no  further
                    obligation   to  Lender.   Lender  may  exercise  the  right
                    described  in this  paragraph by sending  written  notice to

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                    Borrower of such intent to  exercise.  Upon  receiving  such
                    notice  Borrower  shall assign the interest to Lender within
                    ten (10) business days.

               d.   The remedies  provided for in  subparagraphs b. and c, above
                    are mutually exclusive.

     8.   Attorney's Fees. If the  indebtedness  represented by this Note or any
          part thereof is collected in bankruptcy,  receivership, other judicial
          proceedings,  or by exercise of the Power of Sale,  or if this Note is
          placed in the hands of a collection agency, Borrower agrees to pay. In
          addition to the  Principal  and Interest,  reasonable  collection  and
          attorney's  fees  and  costs,  not  to  exceed  $20,000,  incurred  in
          collection by Lender.  The  limitation  on  attorney's  fees shall not
          apply if it is  determined by a Court of competent  jurisdiction  that
          any  defenses,   objections  or  other  legal  obstacles  to  Lender's
          enforcement of this Note, and the remedies  provided for herein,  were
          pled and  asserted  by, or on behalf of.  Borrower in bad faith or for
          the purpose of hindering and delaying  enforcement  without just cause
          or excuse.

     9.   Waiver. Borrower waives presentment, demand and notice of dishonor and
          protest with respect to this Note.


     IN WITNESS WHEREOF, Natural Resource Group. Inc. has caused this Note to be
executed in its corporate name and this Note to be dated,  issued and delivered,
all on the date first written above.

Borrower                                        Lender

NATURAL RESOURCE GROUP, INC.                    FRANK BINGHAM


/s/ Brian Hedberg                              /s/ Frank Bingham
----------------------------------             -------------------
By: Brian Hedberg - General Counsel            Frank Bingham

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