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David Oliver Joins Tri-Valley Corporation Unit as Senior Geologist

David C. Oliver has joined Select Resources Corporation as a senior geologist, it was announced today by Dr. Harold J. Noyes, president. Select is the wholly owned mining subsidiary of Tri-Valley Corporation (AMEX: TIV).

A graduate in geology from the University of Minnesota, Mr. Oliver has a broad background in precious and base metal exploration and industrial minerals and aggregates in areas where Select is currently active or contemplating projects.

Mr. Oliver began his career with uranium activities with Western Nuclear, Inc. and later, Phelps Dodge Zeolites in Wyoming. For 12 years he was area geologist for American Copper and Nickel Company, Inc., based in Alaska as project manager for systematic gold and base metals exploration in Alaska, Montana, Wyoming, California and Arizona. In 1999 he joined Sealaska Corporation as vice president and general manager of Sea Cal LLC and Alaska Coastal Aggregates which included the Admiral Calder super high grade calcium carbonate deposit recently purchased by Select.

"David Oliver is known to members of our growing technical team as a solid, broad based professional who also has operations and management experience to help advance our inventory of gold and industrial mineral properties," Noyes said.

Oliver is relocating to Bakersfield, California to support the firm's calcium carbonate, basalt, cinder and industrial aggregates business as well as project/opportunity evaluation in precious and base metals and industrial minerals domestically and internationally.

The Company is in its 43rd year of business as a successful operating company and for 32 years has been a full reporting 12 (g) publicly traded Delaware Corporation. Tri-Valley Corporation stock is publicly traded on the American Stock Exchange under the symbol "TIV" in the United States and is also traded in Europe on the Frankfurt Stock Exchange under the symbol "TVC WKN 911919." Our company websites, which include all SEC filings, are www.tri-valleycorp.com and www.tri-valley.de.

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 June 30, 2005, and the annual report on Form 10-K for the year ended December 31, 2004.

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