Mr. Jim Mustard reports

MANTLE REPORTS INITIAL INFERRED MINERAL RESOURCE ESTIMATE FOR THE CARDIAC CREEK DEPOSIT OF 23.6 MILLION TONNES GRADING 7.60% ZINC, 1.50% LEAD, 13.0 G/T SILVER

Mantle Resources Inc. has released the initial resource estimate for the Cardiac Creek zinc-lead deposit on its 100-per-cent-owned Akie property in British Columbia, Canada. This resource estimate follows diamond drill programs carried out by the company during the period September, 2005, to November, 2007, and establishes the Cardiac Creek deposit as one of the premier base metal projects in Canada. The estimate has been prepared by Robert Sim, PGeo, an independent qualified person as defined by National Instrument 43-101. A technical report will be filed on SEDAR within 45 days.

Cardiac Creek deposit mineral resource

The Cardiac Creek deposit inferred mineral resource -- at a series of cut-off zinc grades (2 per cent to 7 per cent) -- is summarized in the attached table. The 23,595,000 tonnes at a zinc cut-off grade of 5 per cent contain 3.95 billion pounds of zinc, 780 million pounds of lead and 8.95 million ounces of silver.

       CARDIAC CREEK DEPOSIT INFERRED MINERAL RESOURCE

Cut-off grade Tonnes      Zinc       Lead     Silver     Zn-Pb
(zinc %)      (000)       (%)        (%)      (g/t)      (%)

2             50,874      5.28        1.00      9.6       6.28
3             37,683      6.25        1.22     11.0       7.47
4             30,595      6.89        1.36     12.0       8.25
5             23,595      7.60        1.50     13.0       9.10
6             17,051      8.41        1.68     14.2      10.09
7             11,841      9.26        1.86     15.4      11.12

"We are extremely pleased with the initial mineral resource estimate of the Cardiac Creek deposit," commented Jim Mustard, president of Mantle Resources. "The significant tonnage and contained metal within this estimate is very encouraging in light of the expansive geological setting that not only occurs at the Akie property itself, but throughout the 180-kilometre stretch of geology that Mantle largely controls. This first ever NI 43-101-compliant mineral resource estimate benchmarks our achievement over the past 2.5 years, and truly establishes the Akie property and the district for its significant exploration potential.

"I am particularly proud and happy to be associated with our very professional exploration team which has achieved significant progress over the past year to reach this milestone. By continuing our progress at the Akie property and focusing on regional exploration within the extensive landholdings in the Kechika district -- where we see tremendous potential for additional discoveries -- we look forward to creating further value for Mantle shareholders.

"It is important to note that the Cardiac Creek deposit remains open in all directions. An aggressive drill campaign is planned for this year, which we anticipate will lead to an expansion of the deposit."

Mineral resource estimate criteria

The Cardiac Creek deposit occurs within a planar, steeply dipping (minus 70 degrees), sheet-like zone of semi-massive to massive sulphides, comprising varying amounts of pyrite, sphalerite and galena (plus or minus barite), which has been traced over strike length of 6.5 kilometres and a downdip extent in excess of 800 metres. The mineralized zone ranges in thickness from less than one metre to as much as 40 metres and has an average true thickness of about 20 metres in the area of potential economic interest.

There are a total of 56 drill holes on the property with a total core length of 26,957 metres. Of these, 48 holes are within the proximity of the resource model and are used in the resource estimate. The remaining eight drill holes test the mineralized horizon over a total strike length of 6.5 kilometres.

Resources are limited within a planar zone of mineralization interpreted from drill hole assay sample data coupled with the understanding of the local geologic features observed on the property. Grade estimates for zinc, lead and silver are made using ordinary kriging with a nominal block size of five metres by 10 metres by five metres. Potentially anomalous (outlier) sample grades have been identified through statistical evaluation and limits were appropriately applied during interpolation. Bulk densities have been estimated in the block model from drill core measurements using the inverse distance squared interpolation method. Inferred mineral resources are limited to a maximum of 125 metres from a drill hole.

At the 5-per-cent zinc cut-off limit, the deposit has an approximate 900-metre strike length and a dip length of 750 metres.

About the Akie property

The Akie zinc-lead property is situated within the southernmost part (Kechika trough) of the regionally extensive Paleozoic Selwyn basin, one of the most prolific sedimentary basins in the world for the occurrence of sedimentary exhalative zinc-lead-silver and stratiform barite deposits.

Drilling on the Akie property by Inmet Mining Corp. during the period 1994 to 1996 and by Mantle in 2005, 2006 and 2007, has identified a significant body of baritic-zinc-lead sedimentary exhalative mineralization (Cardiac Creek deposit). The deposit is hosted by variably siliceous, fine-grained clastic rocks of the middle to late Devonian Gunsteel formation.

Two similar deposits, Cirque and South Cirque, located approximately 20 kilometres northwest of Akie, and owned under a joint venture by Teck Cominco and Korea Zinc, are also hosted by Gunsteel rocks. The deposits have a combined geologic inventory in excess of 50 million tonnes.

Qualified person

Independent consultant, Mr. Sim, PGeo, a qualified person as defined by National Instrument 43-101, is responsible for the mineral resource estimate summarized in this release.

John Fraser, PGeo, vice-president of exploration and a director of Mantle Resources, is the qualified person for the company, as defined by NI 43-101. Mr. Fraser is responsible for the technical information contained in this release.