Fieldex announces high grade lithium on Mantis' Case Pegmatite project - 9.2
m of 1.98% LiO2

TORONTO, Sept. 13 /CNW/ - Mantis Mineral Corp., ('Mantis'-CNSX 'MYN') is pleased to announce that Fieldex Exploration Inc.'s ('Fieldex'-TSX-V 'FLX') sampling of 508-meters of archived core from the Case Pegmatite, a lithium rich pegmatite considered to be the fifth largest spodumene subtype in the Superior geologic Province of Ontario, has yielded significant lithium grades.

The project is currently under option from Mantis by Fieldex. The Case Property is located about 80-kilometers east of Cochrane, in Steele Township, northeast Ontario. It lies within the Larder Lake Mining Division. Road access is from the towns of Cochrane or Iroquois Falls. The property consists of 7 staked claims totaling 47 units.

The results of this sampling program are summarized below.

    
                                            Rb     Ta(2)O5 Mn
    Hole No.   From   To     Width  Li(2)0% ppm* ppm*  ppm*

    DDH-1       6.10  14.90   8.80    1.02    843    174     431
    DDH-1      23.80  33.00   9.20    1.98    534    185     587
    DDH-1      33.00  41.75   8.75    0.18    878     tr    1197

    DDH-3      37.00  44.10   7.10    0.11   1181     tr     638
    DDH-3      44.10  53.00   8.90    0.06    374     tr    1674
    DDH-3      53.00  62.77   9.77    0.06    245     tr    2411

    DDH-4      13.96  19.38   5.42    0.33   1003    348     359
    DDH-4      43.32  47.72   4.40    1.49    588    110     499

    DDH-5      43.00  57.07  14.07    1.35    610     tr     609

    DDH-6      47.00  47.58   0.58    1.41    670     tr     515

    DDH-7      65.36  74.50   9.14    0.21   1982     tr    1349
    *One part per million equals one gram per ton.
    

Previously, (from 2001 sampling conducted by Platinova A/S) the lithium (Li(2)O) content of the Case Pegmatite from channel cuts, grab samples and one drill hole DDH-2 within the spodumene zones of the dike returned results ranging from 0.30% to 2.96% and averaging 1.22 %.

The new results confirm that the Case Pegmatite hosts significant lithium mineralization comparable in grade to other pegmatite dikes being evaluated, including; Canada Lithium's Quebec Lithium project which has a reported resource of 31.6 million tonnes grading 1.11%, Nemaska Exploration's Whabouchi project with a reported resource of 9.8 million tonnes grading 1.63%, and Lithium One's James Bay project with reported grades ranging from 1.5 to 1.9% lithium.

The Case Pegmatite complex consists of three dikes; the North, Main and South dikes. The North Dike has a length of 120-meters and is up to 8-meters thick, the Main Dike is 300-meters long and up to 33-meters thick and the South Dike is 14-meters thick and 240-meters long. The Main and North dikes are somewhat similar geologically, being quite well-zoned beryl-muscovite-spodumenequartz-albite-K'spar pegmatites. The South dike is only weakly zoned, lacks spodumene, and has been partly albitized. All these dikes are hosted in pale granodioritic rocks of the Case Batholith, to which they may be genetically related. All the pegmatites contain disseminated, fine-grained columbite-tantalite, but the best mineralization is in the North and Main Dikes (see map on Fieldex website).

Fieldex is currently earning up to a 60% interest in the Case Pegmatite property from Mantis and is planning a follow-up drill program once a full evaluation of the results have been completed.

Quality Assurance / Quality Control

Fieldex Exploration has implemented and adheres to a Quality Assurance/Quality Control program which includes mineralized REE standards, blanks and duplicates for each batch. Assay samples are taken from drill core sawed in half with one half sent to a commercial laboratory and the other half retained for future reference. Analyses are performed by ALS Chemex in Val D'or.

Qualified Person

The sampling program was carried out under the supervision of Robert Sansfaçon, geologist and qualified person as per National Instrument 43-101.

Commented Robin Ross CEO, "the Case pegmatite has a high potential to host significant lithium content. As the automotive industry continues with the electrification of the automobile, the demand for lithium is expected to increase, and although some of this demand will be satisfied by lithium producing brines, it is generally acknowledged among industry experts that lithium pegmatites will also become an important resource for lithium. The Case Pegmatite project being in proximity to established infrastructure bodes very favorably for developing this resource."

Mantis hires HDL Capital Corporation

Mantis is pleased to announce that it has entered into a twelve month business development agreement (the 'Agreement') with HDL Capital Corporation of Toronto ('HDL'). HDL will be granted options to acquire up to an aggregate of 750,000 common shares of Mantis exercisable for a two-year term at an exercise price of $0.05 per common share. Any common shares issued by Mantis under the terms of the Agreement are subject to regulatory approval and a four month regulatory hold period from date of issue.

About Mantis Mineral Corp.

Mantis Mineral Corp. is a Canadian based resource and exploration company traded publicly under the symbol MYN on the CNSX. Mantis is focused on creating shareholder value through the exploration and development of its suite of strategically located, high-impact Canadian exploration projects.

The CNSX has not reviewed and does not accept responsibility for the adequacy of this release.

Information on rare metals

(Reference Asian Metal website (based on the most recent purchase contracts for July, 2010))

1 gram per ton (1 g/t) equals 1 part per million (1 ppm)

Lithium oxide with conversion of the Li2CO3 (lithium carbonate) price (LiO2) -- $15.01 (U.S.) per kilogram;

Tantale (oxide) (Ta2O5) -- $226.50 (U.S.) per kg or 22.6 cents per ppm/gram;

Gallium (Ga) -- $440.00 (U.S.) per kg or 44 cents per ppm/gram.

Other:

Beryllium (Be) -- $500.00 (U.S.) per kg or 50 cents per ppm/gram (source: IBC Advanced Alloys);

Rubidium (Rb) -- $740.00 (U.S.) per kg or 74 cents per ppm/gram (source: USGS, sale of a large quantity from the Tanco mine when there was more information on transactions, 1980 to 1991);

%SEDAR: 00008151E

For further information: Mr. Robin Ross, Chairman & CEO: [phone], [email protected], or visit our corporate website at www.mantismineralcorp.com; Martin Dallaire, eng, President & CEO, Tel.: [phone], Fax: [phone], [email protected], www.fieldexexploration.com