Tri-Valley Adds to California Lease Position

Tri-Valley Oil & Gas Co. has acquired a producing lease of approximately 7,000 acres in California. While the property does not exceed 15% of the balance sheet assets and does not meet the requirements of the Securities and Exchange Commission for mandatory disclosure, the Company believes the property is prospective for hydrocarbon and represents a material opportunity.

Accordingly, the Company makes this abbreviated announcement while keeping further details confidential until its leasing program is complete.