EXHIBIT (a)(20)
                                                                 ---------------


FOR IMMEDIATE RELEASE

Contact:
Dennis R. Neill
Senior Vice President - Samson Investment Company
Telephone (918) 591-1010


                    SAMSON EXTENDS SUBSEQUENT OFFERING PERIOD
                              FOR PYR ENERGY SHARES

              SUBSEQUENT OFFERING PERIOD TO EXPIRE ON JUNE 12, 2007

         Tulsa, Oklahoma, June 4, 2007 - Samson Investment Company ("Samson")
today announced that it was extending the previously announced subsequent
offering period of its tender offer for all outstanding shares PYR Energy
Corporation (AMEX:PYR) common stock for $1.30 per share in cash to Tuesday, June
12, 2007 at 5:00 p.m., New York City time. The subsequent offering period was
previously set to expire Monday, June 4, 2007 at 5:00 p.m., New York City time.

         Including those shares tendered in the initial offering period, PYR
stockholders have now tendered approximately 27,481,752 million shares. Samson
has accepted for payment all shares tendered in the offer, including those
shares tendered in the subsequent offering period to date. Following purchase of
the tendered shares, Samson will own approximately 82% of the outstanding PYR
common stock.

         The purpose of the subsequent offering period is to enable PYR
stockholders who are currently in the process of tendering, but have been
delayed, to tender and receive the $1.30 all-cash offer price on an expedited
basis as opposed to waiting several months for consummation of the merger
described below. Samson urges all PYR stockholders who have not already tendered
to tender their shares during the extended subsequent offering period. Samson
will immediately accept all shares validly tendered during the subsequent
offering period as they are tendered and will pay for such shares promptly.

         Stockholders who tender their shares during the extended subsequent
offering period will receive the same $1.30 all-cash per share consideration
paid during the initial offering period. Procedures for tendering shares during
the subsequent offering period are the same as during the initial offering
period, except (i) shares cannot be delivered through the guaranteed delivery
procedure and (ii) shares tendered during the subsequent offering period may not
be withdrawn.

         As previously announced, PYR, Samson and Samson Acquisition Corp.
("Acquisition Corp.") entered into a definitive merger agreement on April 23,
2007, under which Acquisition Corp. agreed to acquire all of the outstanding
shares of PYR common stock for $1.30 per share in cash. The transaction was
unanimously approved by the boards of directors of PYR, Samson and Acquisition
Corp. Upon expiration of the subsequent offering period, Samson intends to




complete the acquisition of PYR through a merger of Acquisition Corp. into PYR,
in which all PYR shares not tendered into Samson's offer (other than shares held
by Samson or any of its subsidiaries) will be converted into the right to
receive $1.30 per share.

                                       ###

         Weil, Gotshal & Manges LLP and Hogan & Hartson LLP are acting as legal
counsel to Samson. Innisfree M&A Incorporated is acting as information agent.
Wells Fargo, N.A. is acting as depositary.

         Samson Investment Company, headquartered in Tulsa, Oklahoma, is a large
privately held corporation engaged in oil and gas exploration, acquisition and
production operations in 18 states in the United States, Canada, and the North
Sea. Samson's tender offer statement and related press releases can be found at
www.samson.com when available.

IMPORTANT LEGAL INFORMATION

This press release is for informational purposes only and is not an offer to
purchase or the solicitation of an offer to sell any shares.

ANY OFFERS TO PURCHASE OR SOLICITATION OF OFFERS TO SELL PYR SHARES WILL BE MADE
PURSUANT TO THE OFFER TO PURCHASE, LETTER OF TRANSMITTAL AND RELATED MATERIALS
THAT SAMSON DISTRIBUTES TO PYR'S STOCKHOLDERS AND FILES WITH THE SECURITIES AND
EXCHANGE COMMISSION ("SEC"). PYR STOCKHOLDERS ARE URGED TO READ THE OFFER TO
PURCHASE, LETTER OF TRANSMITTAL, RELATED MATERIALS AND ANY OTHER DOCUMENTS
RELATING TO THE TENDER OFFER FILED WITH THE SEC IN THEIR ENTIRETY, BECAUSE THEY
CONTAIN IMPORTANT INFORMATION, INCLUDING THE VARIOUS TERMS OF, AND CONDITIONS
TO, THE TENDER OFFER. PYR STOCKHOLDERS MAY OBTAIN FREE COPIES OF THESE DOCUMENTS
AT THE SEC'S WEB SITE AT WWW.SEC.GOV, AT SAMSON'S WEBSITE AT WWW.SAMSON.COM OR
BY CALLING INNISFREE M&A INCORPORATED, THE INFORMATION AGENT FOR THE OFFER, AT
(888) 750-5834 (TOLL FREE FROM THE U.S. AND CANADA).