Exhibit 99.1


   SOUTH TEXAS OIL COMPANY ACQUIRES ADDITIONAL WORKING INTERESTS IN OPERATED
                                  PROPERTIES

Austin,  Texas  -  July  12,  2007  - South Texas Oil Company (OTCBB: STXX), an
independent energy company today announced that it recently acquired additional
working interests in south central Texas  for  approximately $1.8 million.  The
interests acquired approximately double South Texas  Oil's current ownership in
the leases and South Texas Oil is currently the operator  of  these leases. The
acquisition was funded by the company's credit facility.

South Texas Oil Company's CEO, Murray Conradie stated, "We are  pleased to take
this additional step in our action plan which includes increasing  ownership in
our  current  property  base of producing properties.  Based on 2006 production
numbers, we anticipate the  return  from  revenue  for  this  investment  which
includes 26 producing wells to be just over 12 months.

Also  in  our south central Texas operations, we are continuing to drill in our
new field and  are  currently  completing  and  logging  the  fifth well in the
Bastrop field."

In  conclusion,  Mr.  Conradie  stated,  "I  am pleased with the direction  the
company  is  moving in and especially pleased with  the  addition  of  our  two
seasoned oil and  gas executives, Mr. Scott Zimmerman our new President and Mr.
Bill Zeltwanger, our new vice-President who are both proving to be a tremendous
help with operations and moving the company forward."

ABOUT SOUTH TEXAS OIL COMPANY

South Texas Oil Company  has  mineral  interests in 43,244 acres of oil and gas
properties made up of approximately 20,000 acres in north east Colorado, 18,000
acres in south central Texas and 5,244 acres in southwest Texas.

Certain  statements  made  in  this  press  release   contain   forward-looking
statements  that  involve  a  number of risks and uncertainties. This  forward-
looking information is based on  certain  assumptions, including, among others,
presently known physical data concerning size  and  character of reservoirs and
economic  recoverability.  Some  of  these  expectations  may   be  based  upon
assumptions  or  judgments that prove to be incorrect. In addition,  operations
involve numerous risks  and uncertainties, many of which are beyond South Texas
Oil's  control, which could  result  in  expectations  not  being  realized  or
otherwise  materially  affect the financial condition, results of operation and
cash  flows.  Additional  information  regarding  these  and  other  risks  are
contained  in  South Texas Oil's  filings  with  the  Securities  and  Exchange
Commission.

Contact:

Investor Contact:
BPC Financial Marketing
John Baldissera
800-368-1217