EXHIBIT 2.3

                               SECOND AMENDMENT TO
                      PLAN AND AGREEMENT OF SHARE EXCHANGE

     THE PLAN AND AGREEMENT OF SHARE EXCHANGE  ("Agreement")  entered into as of
March 2, 2001,  by and  between  Admiralty  Corporation,  a Georgia  corporation
("Admiralty");  Ruby Mining Company, a Colorado  corporation  ("RMC");  and U.S.
Energy Corp., a Wyoming corporation ("USE"), was amended as of April 6, 2001 and
is  amended  again  as of May 4,  2001.  "Section"  refers  to  sections  in the
Agreement; capitalized terms have the meanings therein ascribed. Only paragraphs
1 and 2 of the first Amendment are changed by this Second Amendment.  Except for
such changes, the Agreement as amended on April 6, 2001 remains in effect.

     1. The Closing Date under Section 1.02 is changed to the date  described in
paragraph 2 below.

     2. The amount of fees  payable to USE for its Exchange  Services  Agreement
under Section 2.02 does not change,  but payment terms are changed to be $50,000
payable by wire  transfer on May 4, 2001,  and $50,000  payable on the  earliest
date  thereafter  (the "Closing  Date") on which cleared funds are available for
such purpose from the escrow  account  established  for  Admiralty by Kutak Rock
LLP.

     IN WITNESS  WHEREOF,  each of the Parties has caused this  Amendment  to be
executed on its behalf  attested by  officers  thereunto  as of the day and year
first above written.

USE:                                             RMC:


U.S. ENERGY CORPORATION                    RUBY MINING COMPANY


By    /s/   John L. Larsen                 By    /s/   John L. Larsen
  --------------------------------            ----------------------------------
Name   John L. Larsen                      Name    John L. Larsen
    ------------------------------              --------------------------------
Title     CEO                              Title      President
     -----------------------------               -------------------------------


                                           ADMIRALTY:


                                           ADMIRALTY CORPORATION


                                           By    /s/   Herbert C. Leeming
                                              ----------------------------------
                                           Name    Herbert C. Leeming
                                                --------------------------------
                                           Title      Chairman
                                                 -------------------------------








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