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REPORT SHOWS PROVED UNDEVELOPED RESERVES (PUD) OF 2.143 BCF GAS FROM HOSSTON/COTTON VALLEY ZONES ON MAINLAND RESOURCES’ FIRST DESOTO PARISH, LOUISIANA WELL

Houston, Texas / PR Newswire – Dec. 16, 2008 –Mainland Resources, Inc., a Nevada corporation (the “Company”) (MNLU-OTCBB, 5MN-Frankfurt) reports that it has received a Reserve Report prepared pursuant to U.S. Securities legislation by T.W. McQuire & Associates, Inc, Petroleum Consultants based on data from its Griffith 11 #1 test well currently being drilled.

The Reserve Report places Ultimate Recovery for the Hosston Package at 1265 MMCFG and for the Cotton Valley Package at 878 MMCFG, for a total of 2143 MMCFG (2.143 Billion cubic feet of gas) from a single future twin to the current well. This estimate is based on 40-acre well spacing.

Mainland Resources, Inc. holds a 100% working interest in all rights above the base of the Cotton Valley formation in approximately 2,695 net acres in De Soto Parish, northwest Louisiana. The Griffith 11 #1 is located in Holly Field, and will extend the field on the east flank. It is adjacent to producing sections located to the north and west, and is the first and only Hosston/Cotton Valley well drilled in Sec 11-13N-14W.

The Hosston and Cotton Valley wells are being drilled on a 40-acre spacing. One unit equals 640 acres (or one section), so there could be up to 16 wells drilled per 640 acres. This approach has been successful in the adjacent Holly Field and the nearby Bethany Longstreet and Kingston Fields. Sections of the Holly/Bethany Longstreet/Kingston Field areas that do not have 16 wells drilled are expected to eventually reach that number of well density. Earlier wells were only drilled to the Hosston, therefore, there are numerous infill wells being drilled to the Cotton Valley depth (which is immediately below Hosston).

Company President, Mike Newport states, “This Reserve Report places the Total Proved Undeveloped Reserve at 2.143 BCF gas for a single 40-acre spaced well on our DeSoto Parish Leases. That’s currently worth approximately USD $10,715,000, based on $5 gas pricing. Mainland’s net revenue interest is approximately 75% covering our leasehold, which would net a potential $8,036,250 profit per well, less the applicable drilling/completion costs and production costs. There is room for at least 64 such wells on our leasehold interest, which calculates out as a potential profit of $514,320,000, less applicable drilling/completion costs and production costs from the Hosston/Cotton Valley formations alone”. Newport adds, "There is no guarantee that the Company will achieve any such results or profits and the figures provided herein are estimates of management based upon analysis of the data."

“This development is important because it gives our current reserves significant value, regardless of the Haynesville shale gas production, which is the next target we are drilling to”, states Newport. “

About Mainland Resources, Inc.

Mainland Resources is a junior company engaged in the exploration and development of oil and gas resources. The Company’s current initiatives are focused on the acquisition and development of leases in emerging gas regions with the potential for discoveries including the Haynesville shale.

Symbol: MNLU – OTCBB, Symbol: 5MN; Frankfurt, WKN No.: A0ND6N

Contact:

Investor Relations (USA)
Tel. Toll-free 866-590-6589

Investor Relations (Europe)
Tel. +49-69-7593-8408

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EXCEPT FOR THE HISTORICAL INFORMATION PRESENTED HEREIN, MATTERS DISCUSSED IN THIS NEWS RELEASE CONTAIN FORWARD-LOOKING STATEMENTS THAT ARE SUBJECT TO CERTAIN RISKS AND UNCERTAINTIES THAT COULD CAUSE ACTUAL RESULTS TO DIFFER MATERIALLY FROM ANY FUTURE RESULTS, PERFORMANCE OR ACHIEVEMENTS EXPRESSED OR IMPLIED BY SUCH STATEMENTS. STATEMENTS THAT ARE NOT HISTORICAL FACTS, INCLUDING STATEMENTS THAT ARE PRECEDED BY, FOLLOWED BY, OR THAT INCLUDE SUCH WORDS AS “ESTIMATE,” “ANTICIPATE,” “BELIEVE,” “PLAN” OR “EXPECT” OR SIMILAR STATEMENTS ARE FORWARD-LOOKING STATEMENTS. RISKS AND UNCERTAINTIES FOR THE COMPANY INCLUDE, BUT ARE NOT LIMITED TO, THE RISKS ASSOCIATED WITH PROPERTY DEVELOPMENT AND FUNDING AS WELL AS THE RISKS SHOWN IN THE COMPANY’S MOST RECENT ANNUAL REPORT ON FORM 10-KSB AND ON FORM 10-QSB AND FROM TIME-TO-TIME IN OTHER PUBLICLY AVAILABLE INFORMATION REGARDING THE COMPANY. OTHER RISKS INCLUDE RISKS ASSOCIATED WITH THE REGULATORY APPROVAL PROCESS, COMPETITIVE COMPANIES, FUTURE CAPITAL REQUIREMENTS AND THE COMPANY’S ABILITY AND LEVEL OF SUPPORT FOR ITS EXPLORATION AND DEVELOPMENT ACTIVITIES. THERE CAN BE NO ASSURANCE THAT THE COMPANY’S DEVELOPMENT EFFORTS WILL SUCCEED AND THE COMPANY WILL ULTIMATELY ACHIEVE COMMERCIAL SUCCESS. THESE FORWARD-LOOKING STATEMENTS ARE MADE AS OF THE DATE OF THIS NEWS RELEASE, AND THE COMPANY ASSUMES NO OBLIGATION TO UPDATE THE FORWARD-LOOKING STATEMENTS, OR TO UPDATE THE REASONS WHY ACTUAL RESULTS COULD DIFFER FROM THOSE PROJECTED IN THE FORWARD-LOOKING STATEMENTS. ALTHOUGH THE COMPANY BELIEVES THAT THE BELIEFS, PLANS, EXPECTATIONS AND INTENTIONS CONTAINED IN THIS NEWS RELEASE ARE REASONABLE, THERE CAN BE NO ASSURANCE THOSE BELIEFS, PLANS, EXPECTATIONS OR INTENTIONS WILL PROVE TO BE ACCURATE. INVESTORS SHOULD CONSIDER ALL OF THE INFORMATION SET FORTH HEREIN AND SHOULD ALSO REFER TO THE RISK FACTORS DISCLOSED IN THE COMPANY’S PERIODIC REPORTS FILED FROM TIME-TO-TIME WITH THE UNITED STATES SECURITIES AND EXCHANGE COMMISSION.

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