UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549



                                 SCHEDULE 13D/A
                                Amendment No. 1



                   Under the Securities Exchange Act of 1934


                                 T-REX OIL, INC.
             ------------------------------------------------------
                                (Name of Issuer)

                        Common Stock, $0.001 per share
             ------------------------------------------------------
                         (Title of Class of Securities)

                                   75188R106
              ------------------------------------------------------
                                (CUSIP Number)

                                   Allen Heim
                              411 S. Myrtle Street
                               Kimball, NE 69145
                                 (720) 502-4483
             ------------------------------------------------------
                 (Name, Address and Telephone Number of Person
               Authorized to Receive Notices and Communications)

                                  July 15, 2015
                 ---------------------------------------------
            (Date of Event which Requires Filing of this Statement)

If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  that is the subject of this  Schedule  13D, and is filing this
schedule because of ss.ss.240.13d-1(e),  240.13d-1(f) or 240.13d-1(g), check the
following box. /_/

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).


CUSIP No.

1.   NAMES OF REPORTING PERSONS:

     Allen Heim

2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):(a) /_/
                                                                         (b) /_/
3.   SEC USE ONLY:

4.   SOURCE OF FUNDS (SEE INSTRUCTIONS): OO / OO

5.   CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d)
     OR 2(e): /_/

6.   CITIZENSHIP OR PLACE OF ORGANIZATION:

     United States

                             7.  SOLE VOTING POWER:

                                 750,000 Common Shares; 200,000 Warrants (1)
      NUMBER OF SHARES
      BENEFICIALLY OWNED     8.  SHARED VOTING POWER:
      BY EACH REPORTING
      PERSON WITH                5,000

                             9.  SOLE DISPOSITIVE POWER:

                                 750,000 Common Shares; 200,000 Warrants (1)

                             10. SHARED DISPOSITIVE POWER:

                                 5,000

11.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:

     755,000 shares of Common Stock; 200,000 Warrants (1)

12.  CHECK IF THE  AGGREGATE  AMOUNT IN ROW (11)  EXCLUDES  CERTAIN  SHARES (SEE
     INSTRUCTIONS): /_/

13.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):

     4.78% Common Stock; 5.97% if Warrants are exercised (1)

14.  TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):

     IN
----------------

(1)  Warrants are  exercisable  at $1.00 per share and have an issuance  date of
     11/15/2014 and expiration date of 11/15/2017

                                      -1-


ITEM 1. SECURITY AND ISSUER
---------------------------

The security for which this report is made is the common stock, par value $0.001
per share, of T-Rex Oil, Inc., a Colorado corporation (the "Issuer").

ITEM 2. IDENTITY AND BACKGROUND.
--------------------------------

This  amendment  to  Schedule  13D is being  filed on behalf of Allen  Heim,  an
individual,  as a result  of his  ownership  decreasing  to less  than 5% of the
issued  and  outstanding.  The  address  of Mr.  Heim is 411 S.  Myrtle  Street,
Kimball, NE 69145.

Mr. Heim is the Vice  President of  Operations  and a director of the  Company's
Subsidiary,  Terex Energy Corp. Effective August 1, 2015, he will be appointed a
director of T-Rex Oil, Inc.

Allen Heim, 58, VP of Operations and a director of Terex Energy Corp.

Mr.  Heim has  devoted  most of his 30 year  career  to a  variety  of oil field
disciplines  including leasing,  dealing in working  interests,  drilling wells,
fracking,   and  managing  hands-on  all  phases  of  post  drilling   including
completions and follow on operations through plug and abandon.  Mr. Heim has had
control  positions in more than 300 wells primarily located in western Nebraska,
eastern Colorado and southwestern Wyoming.

Mr. Heim is highly experienced in location  construction of oil well properties,
pumping  and long term well ops as well as  directional  drilling  and  fracking
operations  planning and execution.  Mr. Heim is a successful  finder of oil and
gas  composites  in the Colorado D-J Basin,  and is skilled in geologic  project
budgeting and prospect  design.  He is also highly  experienced in pipeline work
and in  pipeline  corrosion  control  as  well  as gas  plant  construction  and
operations.  He has worked directly for several major oil companies,  and dozens
of "Junior Oils."

Most recently,  Mr. Heim has been retained by Edward (Tiger) Mike Davis Oil. His
assignments  previously  included Bic Petroleum,  Smith Oil, Petro West, Bolling
Oil, Pease Oil and Gas, Pan Western Energy, Paladin Energy, Charterhall,  Haines
Oil Field Services, New Tech Energy, O'Brien Energy,  Peterson Energy,  Sunburst
Inc., Markus Production,  Lyco Energy, Wanda Madden Oil, and numerous others. He
is also the owner of Allen's Pumping Service in Kimball, Nebraska.

Mr.  Heim has not,  during the last five  years,  been  convicted  in a criminal
proceeding (excluding traffic violations or similar misdemeanors).

Mr. Heim has not, during the last five years, been a party to a civil proceeding
of a judicial or administrative  body of competent  jurisdiction and as a result
of such  proceeding  was or is  subject  to a  judgment,  decree or final  order
enjoining future violations of, or prohibiting or mandating  activities  subject
to,  federal or state  securities  laws or finding any violation with respect to
such laws.

Mr. Heim is a citizen of the United States of America.

                                      -2-

ITEM 3. SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION
---------------------------------------------------------

On February 12, 2014, Mr. Heim received  750,000 shares of common stock of Terex
Energy Corp. for his services.  His wife  purchased  5,000 shares for a combined
total of 755,000 shares of common stock. Mr. Heim was appointed a Vice President
of Operations of Terex Energy Corp.  in May,  2014. On December 22, 2014,  T-Rex
Oil, Inc.  acquired 100% of the  outstanding  stock of Terex Energy Corp.  after
exchanging  7,385,700  shares with Terex Energy Corp.  shareholders on a one for
one basis.  In addition to the exchange of common stock,  the Company  exchanged
with Mr. Heim 200,000  Warrants with an exercise price of $1.00 per share with a
term of 3 years.

ITEM 4. PURPOSE OF TRANSACTION
------------------------------

Mr. Heim is sole owner of the 750,000 shares and 200,000 Warrants of the Company
and as such has the  ability  to vote the  shares.  Mr.  Heim's  wife owns 5,000
shares of which he is deemed to beneficially own. In addition,  Mr. Heim is Vice
President of Operations of Terex Energy Corp., the Company's  subsidiary,  and a
10% +/-  shareholder  and as such Mr. Heim may  influence  the  following  which
relate to, or could result in the matters  referred to in paragraphs (a) through
(j),  inclusive,  of the  instructions to Item 4 of Schedule 13D as follows:  a)
acquisitions of prospects and/or  companies which continue for Issuer,  based on
the business  judgment of the board of directors b) the reporting person intends
to work with other  management to formulate a plan to capitalize  the Issuer for
at least  $10,000,000,  (although there can be no assurance that the Issuer will
successfully achieve that, or any, additional debt or equity capitalization).

The  Reporting  Person  may,  at any  time  and from  time to  time,  review  or
reconsider  their position  and/or change his purpose and/or  formulate plans or
proposals with respect thereto.


ITEM 5. INTEREST IN SECURITIES OF THE ISSUER
--------------------------------------------

The  percentages of outstanding  shares of T-Rex Oil, Inc. common stock reported
below are  based on the fact that as of July 15,  2015,  there  were  15,771,142
shares of T-Rex Oil, Inc. common stock outstanding.

     (a) Mr.  Heim  beneficially  owns or may be deemed to  beneficially  own
shares of T-Rex Oil, Inc. common stock as follows:

                                    No. of Shares            % of Class
                                    -----------------        -------------
      Common Shares                 755,000                  4.78%
                                    -----------------        -------------
                                    755,000                  4.78%

     (b) For  information  regarding  the  number of shares of T-Rex  Oil,  Inc.
common  stock as to which  Mr.  Heim  holds or  shares or may be deemed to hold,
reference  is made to items (7) - (12) of the cover page for this  statement  on
Schedule 13D.

     (c) Other  than as set forth  herein,  there have been no  transactions  in
shares of T-Rex Oil, Inc.  common stock  effected by Mr. Heim during the past 60
days.

     (d) No other  person  has the right to  receive  or the power to direct the
receipt of dividends from, or the proceeds from the sale of, such securities.

     (e) The date on which the  reporting  person  ceased to be the  beneficiary
owner of more than five percent of the class of securities: July 15, 2015



                                      -3-

ITEM 6. CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT TO
SECURITIES OF THE ISSUER.
--------------------------------------------------------------------------------

Mr. Heim has no contracts, arrangements,  understandings or relationships (legal
or otherwise)  with other  persons with respect to the  securities of T-Rex Oil,
Inc., other than as described in this statement on Schedule 13D.


ITEM 7. MATERIAL TO BE FILED AS EXHIBITS.
-----------------------------------------

Not Applicable






                                   SIGNATURES

After  reasonable  inquiry and to the best of my knowledge and belief, I certify
that the information set forth in this statement is true, complete and correct.



                                       Date: July 22, 2015




                                       /s/ Allen Heim
                                       ---------------------------------
                                       Allen Heim, Individual



































                                      -4-