Atlas Energy Resources, LLC announced today that it has completed its acquisition of DTE Gas & Oil Company ("DGO"), formerly a wholly owned subsidiary of DTE Energy Company (NYSE:DTE - News). The total consideration paid by Atlas Energy, including initial adjustments for capital expenditures and working capital, was approximately $1.258 billion, subject to final post-closing adjustments.

DGO owns interests in approximately 2,150 natural gas wells producing from the Antrim Shale, located in Michigan's northern lower peninsula. The Antrim Shale is a mature play characterized by long-lived reserves and predictable production rates. Schlumberger Data Consulting has engineered 613 Bcfe (billion cubic feet of natural gas equivalents) of proved reserves on DGO's approximately 228,000 net developed acres and 66,000 net undeveloped acres. Dick Redmond, Jr., President of DGO, has joined Atlas Energy as President of the Company's new Michigan business unit.

Funds for the DGO acquisition came from: 1) a private placement to institutional investors in the amount of $600 million, representing 24 million common and Class D units having a weighted average price of $25.00 per unit; and 2) a new $850 million senior secured revolving credit facility with an initial borrowing base of $850 million, most of which will fund the remaining balance of the purchase price.

UBS Investment Bank acted as financial advisor and private placement agent to Atlas Energy. JPMorgan Chase Bank, N.A. acted as lead arranger and book runner for the Company's new revolving credit facility.

Atlas Energy Resources, LLC is an energy company focused on the development and production of natural gas and, to a lesser extent, oil principally in the Appalachian Basin. Atlas Energy sponsors and manages tax advantaged investment partnerships, in which it co-invests, to finance the exploitation and development of its acreage. For more information, please visit our website at www.atlasenergyresources.com, or contact Investor Relations at bbegley@atlasamerica.com.

Atlas America, Inc. (NasdaqGS:ATLS - News) after this transaction owns a 47.4% common unit interest and all of the Class A and management incentive interests in Atlas Energy Resources, LLC (NYSE:ATN - News), and an 83% limited partner interest in Atlas Pipeline Holdings, L.P. (NYSE:AHD - News), a limited partnership which owns the general partner interest in Atlas Pipeline Partners, L.P. (NYSE:APL - News), all the incentive distribution rights and 1.6 million common units of APL. For more information, please visit our website at www.atlasamerica.com, or contact Investor Relations at bbegley@atlasamerica.com.

Certain matters discussed within this press release are forward-looking statements. Although Atlas Energy Resources, LLC believes the expectations reflected in such forward-looking statements are based on reasonable assumptions, it can give no assurance that its expectations will be attained. Factors that could cause actual results to differ materially from expectations include financial performance, inability of the Company to successfully integrate DGO's operations, regulatory changes, changes in local or national economic conditions and other risks detailed from time to time in Atlas Energy's reports filed with the SEC, including quarterly reports on Form 10-Q, reports on Form 8-K and annual reports on Form 10-K.


Contact:

Contact:
Brian Begley
Investor Relations
1845 Walnut Street
Philadelphia, PA 19103
(215) 832-4123
(215) 561-5692 (facsimile)


Source: Atlas Energy Resources, LLC

Parker Drilling Co. said Friday its offering of $115 million in convertible debt will have an initial conversion rate of about $13.85 per share.

The notes will carry an interest rate of 2.125 percent and convert at 72.2217 shares per $1,000 in principal. At $13.85 per share, that is a premium of 33 percent over the stock's closing price Thursday of $10.45.

The crude oil and natural gas drilling company plans to use the proceeds to repay existing debt and for general corporate purposes.

Questions or comments about this story should be directed to the Financial News desk of The Associated Press at 212-621-7190.

Seacor Holdings Inc., which provides offshore services to the oil industry, and drilling contractor Nabors Industries Ltd. said Friday they plan to form a company that will own and operate a fleet of offshore support vessels.

Sea Mar Offshore LLC will manage 19 U.S. ships and one foreign flag vessel. The ships are currently owned by a Nabors affiliate.

A unit of Seacor will be the majority owner of Sea Mar Offshore.

The deal is expected to close around July 13.

Questions or comments about this story should be directed to the Financial News desk of The Associated Press at 212-621-7190.

PRB Energy, Inc. ("PRB" or the "Company") today announced that it drilled its first well to the Niobrara formation in the Denver-Julesburg (D-J) Basin in eastern Colorado and the electric logs indicate that, upon completion, the well will be commercial.

The drilling rig ran and cemented casing and has moved to the second location.

After drilling the first six to seven wells of the 14-well program, the Company will begin fracing and completing the wells.

In addition, PRB has entered into an agreement with another company whereby PRB will be paid $1.9 million for its rights to a gas processing plant that was to be built in North Dakota. The payment reimburses the Company for its efforts associated with the planning and construction of the plant and pays PRB for its previous design efforts and its rights to the plant.

With respect to the RMG transaction that was announced on May 17, 2007, the Company received the second $500,000 payment on June 21, 2007.

Robert W. Wright, PRB's Chairman and CEO, noted, "We are very pleased with the indications received from the electric logs on the first D-J Basin well. We have accomplished much during the first six months of owning this property and believe that this acquisition will prove to be a significant asset for PRB. Regarding the Company's cash position, RMG has paid PRB $1 million toward the $3.25 million owed, with the balance due in October. In addition, in July a minimum of $1 million deposited to cover plugging and abandonment liabilities as a result of the Pennaco transaction in 2006 will be released and we are awaiting the payment of $1.9 million for the plant. This capital will be deployed to the Niobrara drilling program in the D-J Basin."

About PRB Energy, Inc.

Having commenced operations in January 2004, PRB Energy has evolved into an exploitation and gathering company with development activities in the Rocky Mountain States. The Company is vertically integrated, combining upstream exploitation and production as well as midstream gathering and processing. This model is intended to increase PRB Energy's access to and acquisition of high-potential development properties at attractive prices, delivers cost savings and provides additional revenue through the gathering of third-party gas.

Forward-Looking Statements

This press release may include certain statements concerning expectations for the future that are forward-looking statements. Such forward-looking statements are subject to a variety of known and unknown risks, uncertainties and other factors that are difficult to predict and many of which are beyond management's control. An extensive list of factors that can affect future results are discussed in the Company's Registration Statement on Form S-3/A recently filed with the Securities and Exchange Commission. The Company undertakes no obligation to update or revise any forward-looking statements to reflect new information or events.

Company Contact: or Investor Relations Counsel:
PRB Energy, Inc. DRG&E
Robert W. Wright, Chairman and CEO Jack Lascar/Lisa Elliott
(303) 308-1330 (713) 529-6600
investors@prbenergy.com jlascar@drg-e.com/lelliott@drg-e.com


Source: PRB Energy, Inc.

Parker Drilling Co. plans to offer $115 million in convertible senior notes due 2012 in a public offering.

The Houston-based offshore drilling company said it will grant underwriters the option to purchase up to an additional $10 million notes to cover over-allotments.

Parker said it will use the sale proceeds to redeem all of its outstanding senior floating rate notes due 2010 and for general corporate purposes, as well as to pay the net cost of convertible note hedge and warrant transactions.

The sole book-running manager for this offering will be Banc of America Securities LLC. Deutsche Bank Securities and Lehman Brothers will act as co-managers.

Published June 28, 2007 by the Houston Business Journal

Tri-Valley Corporation announced that logging results of its fifth newly drilled delineation well at Temblor Valley West, the Lundin-Weber D-24-31, have now confirmed a nearly one-half mile further westerly extension of the oil-bearing Tulare and Diatomite formations, potentially adding millions of barrels of oil beyond the map, which was the original basis for acquiring this 700-acre lease.


Initially, the Company will complete and test at least 150 feet of the Diatomite zone in this latest well, and maybe more, pending further analysis of sidewall cores.

"As a result of successful discovery of oil-bearing formations in all our first five drillings at Temblor, we have subsequently prepared three more drilling locations to further define this expanding oil play, especially since we know we are high on the structure to the main South Belridge Oil Field. Meanwhile, we have already begun the dual projects of water-flooding the Etchegoin section and steam cycling the Diatomite interval as part of our re-exploitation program of this property," said Joseph R. Kandle, president of the operating subsidiary, Tri-Valley Oil & Gas Co.

Temblor Valley West is located on the west flank of the prolific South Belridge Oil Field, some 40 miles west of Bakersfield, California. South Belridge is the nation's third highest producing oil field outside of Alaska and produces primarily from steamed Tulare and Diatomite zones.

The company has been in business as a successful operating company since 1963, and has been a full reporting 12 (g) publicly traded Delaware Corporation since 1973. Tri-Valley Corporation stock is publicly traded on the American Stock Exchange under the symbol "TIV." Our company website, which includes all SEC filings, is www.tri-valleycorp.com.

This press release contains forward-looking statements that involve risks and uncertainties. Actual results, events and performance could vary materially from those contemplated by these forward-looking statements which includes such words and phrases as exploratory, wildcat, prospect, speculates, unproved, prospective, very large, expect, potential, etc. Among the factors that could cause actual results, events and performance to differ materially are risks and uncertainties discussed in the company's quarterly report on Form 10-Q for the quarter ended March 31, 2007, and the annual report on Form 10-K for the year ended December 31, 2006.


Contact:

Contact:
F. Lynn Blystone
President & CEO
800-579-9314


Source: Tri-Valley Corporation

Grey Wolf, Inc. invites you to join Thomas P. Richards, Chairman, President and Chief Executive Officer and David W. Wehlmann, Executive Vice President and Chief Financial Officer, Thursday, August 2, 2007 at 8:00 a.m. CT for a discussion of operating results for the second quarter 2007. Grey Wolf will release earnings after the market closes on August 1, 2007.

Following the presentation there will be a question and answer period.

Date: August 2, 2007
Time: 8:00 a.m. CT
Dial-In Number:
Domestic: 800-287-0836
International: 212-676-4903
Reservation Number: 21342926

Please call ten minutes ahead of time to ensure proper connection. The conference call will be recorded and available for replay at 10:00 a.m. CT on August 2, 2007 until 10:00 a.m. CT on August 4, 2007. To hear the recording, please call (800) 633-8284 domestically or (402) 977-9140 internationally and enter access code 21342926.

The call will also be webcast live on the Internet through our website at:

http://www.gwdrilling.com

The call will be available for replay through our website for approximately two weeks after the conclusion of the call. A copy of our earnings release will also be available on our website.

If you have any questions, please call David W. Wehlmann with Grey Wolf at (713) 435-6100.


Source: Grey Wolf, Inc.