Sheffield Resources Ltd.
TSX VENTURE : SLD
FRANKFURT : S2Q

Sheffield Resources Ltd.

March 06, 2008 09:30 ET

Sheffield Intersects 71 Metres of 1.4% Copper at Surface

VANCOUVER, BRITISH COLUMBIA--(Marketwire - March 6, 2008) - Sheffield Resources Ltd. ("Sheffield") (TSX VENTURE:SLD)(FRANKFURT:S2Q) is pleased to report additional assay results from the diamond drilling, reverse circulation drilling and trench sampling programs at the Engels Mine Prospect and at the Moonlight Deposit, both of which are located on Sheffield's Moonlight Copper Project claims in Plumas County, California.



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COPPER GOLD SILVER LENGTH FROM TO
DRILL HOLE (%) (gpt) (gpt) (metres) (metres) (metres)
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07-E-27 1.63 0.03 14.9 42.0 (137.8 ft) 12.0 54.0
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including 3.81 0.07 38.0 14.0 (45.9 ft) 36.0 50.0
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07-E-28 1.41 0.10 9.2 71.6 (234.9 ft) Surface 71.6
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including 2.17 0.02 18.3 26.0 (85.3 ft) 44.0 70.0
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07-E-29 0.50 0.08 5.3 6.0 (19.7 ft) Surface 6.0
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and 1.47 0.09 18.0 12.0 (39.4 ft) 14.0 26.0
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07-E-30 2.29 0.11 22.3 42.9 (140.7 ft) 12.0 54.9
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including 2.09 0.11 21.7 36.0 (118.1 ft) 12.0 48.0
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including 2.61 0.12 28.3 14.0 (45.9 ft) 16.0 40.0
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including 3.78 0.16 28.7 6.0 (19.7 ft) 48.0 54.0
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The current drill program is designed to define high-grade copper mineralization, which may in part be mined in the initial starter pit of a copper leach mine at the Moonlight Project. In the current program a total of 32 core holes have been drilled at the Engels Mine Prospect and a further 15 reverse circulation holes have been drilled in the Moonlight Deposit. Assays for two core holes have yet to be reported by the assay laboratory. Samples from the 15 reverse circulation holes were only recently submitted for assay. Sample material derived from the core and reverse circulation drill cuttings will be used this spring in a metallurgical program to begin characterization of the several types of mineralization recovered in this season's drill program. Silver and gold contained in the mineralization are highly unlikely to be recovered in a copper leach operation, but may contribute to revenue if some of the copper is recovered in a flotation concentrate.

Dave Jenkins, Sheffield's President recently commented, "These drill results continue to expand the area of potentially economic mineralization starting at the surface at the Engels Mine prospect. The Engels' mineralization remains open for expansion to the north, west, south and to depth. We are particularly excited about these results from the Engels Mine Prospect during this period of rising copper prices. The near surface geometry, high grade and oxidation all indicate that this project has the potential to be fast tracked to feasibility at low cost." Photographs of the project can be found on Sheffield's website www.sheffieldresources.com.

The drill holes reported herein are from the first modern drill program in the Engels Mine area, which is one of four principal target areas on the Moonlight Copper/Silver Project. A preliminary NI 43-101 compliant resource was reported in March 2007 for the adjacent Moonlight Deposit which also remains open to resource expansion laterally and to depth.



PREVIOUSLY REPORTED HIGH-GRADE COPPER INTERCEPTS
FROM THE ENGELS MINE PROSPECT AT MOONLIGHT PROJECT

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COPPER GOLD SILVER LENGTH FROM TO
DRILL HOLE (%) (g/t) (g/t) (metres) (metres) (metres)
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07-E-1 2.95 0.14 23.6 54.0 (177.2 ft) Surface 54.0
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07-E-2 2.54 0.05 22.1 44.0 (144.4 ft) Surface 44.0
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07-E-3 2.99 0.09 27.9 28.0 (91.9 ft) Surface 28.0
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07-E-4 3.71 0.07 43.2 37.8 (124.0 ft) Surface 37.8
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including 10.1 0.18 125.3 12.0 (39.4 ft) 16.0 28.0
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07-E-5 1.00 0.04 6.1 41.8 (137.1 ft) Surface 41.8
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including 1.50 0.08 7.1 13.8 (45.3 ft) 28.0 41.8
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including 3.48 0.17 8.0 2.0 (6.6 ft) 34.0 36.0
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and 2.54 0.02 6.0 2.0 (6.6 ft) 36.0 38.0
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07-E-6 0.80 0.01 6.3 35.7 (117.1 ft) Surface 35.7
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including 0.99 0.01 6.5 24.0 (78.7 ft) 2.0 26.0
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07-E-7 0.67 0.23 4.9 20.0 (65.6 ft) Surface 20.0
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and 0.45 0.00 1.1 32.0 (105.0 ft) 82.0 114.0
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and 0.87 0.09 6.6 50.0 (164.0 ft) 172.0 222.0
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including 1.69 0.13 13.6 10.0 (32.8 ft) 172.0 182.0
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and 1.32 0.20 10.6 10.0 (32.8 ft) 194.0 204.0
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and 1.14 0.11 7.7 12.0 (39.4 ft) 210.0 222.0
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07-E-8 3.12 0.26 25.1 19.8 (65.0 ft) 54.0 73.8
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including 7.84 0.74 63.7 6.0 (19.7 ft) 58.0 64.0
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07-E-9 LOST HOLE
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07-E-10 1.85 0.06 12.8 8.4 (27.6 ft) 98.0 106.4
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including 3.00 0.09 21.3 4.6 (15.1 ft) 100.0 104.6
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07-E-11 1.11 0.08 11.1 102.0 (334.7 ft) Surface 102.0
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including 2.43 0.08 15.4 24.0 (78.7 ft) 32.0 56.0
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07-E-12 1.06 0.23 9.6 38.0 (124.7 ft) Surface 38.0
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including 2.74 0.51 23.0 2.0 (6.6 ft) Surface 2.0
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and 3.42 0.34 39.0 2.0 (6.6 ft) 20.0 22.0
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07-E-13 1.66 0.03 16.0 81.6 (267.7 ft) Surface 81.6
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including 2.59 0.04 29.3 38.0 (124.7 ft) 38.0 76.0
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including 3.57 0.07 66.5 8.0 (26.5 ft) 38.0 46.0
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and 3.79 0.09 52.0 8.0 (26.5 ft) 52.0 60.0
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and 3.14 0.03 9.0 10.0 (32.8 ft) 66.0 76.0
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07-E-14 0.88 0.03 7.0 54.0 (177.2 ft) Surface 54.0
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07-E-15 1.10 0.02 10.0 30.0 (98.4 ft) Surface 30.0
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07-E-16 1.92 0.15 19.0 20.0 (65.6 ft) Surface 20.0
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07-E-17 0.76 0.05 6.3 48.0 (157.5 ft) 6.0 54.0
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07-E-18 1.30 0.05 12.4 50.0 (164.0 ft.) 6.0 56.0
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including 3.19 0.05 11.7 14.0 (45.9 ft.) 38.0 52.0
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07-E-19 0.52 0.03 3.8 22.0 (71.2 ft.) Surface 22.0
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and 0.91 0.04 8.9 31.2 (102.4 ft.) 34.0 65.2
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07-E-20 0.53 0.04 7.5 32.0 (105.0 ft.) Surface 32.0
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and 0.82 0.09 5.9 32.0 (105.0 ft.) 52.0 84.0
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07-E-21 0.91 0.14 8.2 26.0 (85.3ft.) Surface 26.0
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and 0.33 0.13 0.6 14.0 (45.9 ft.) 44.0 58.0
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07-E-22 1.08 0.02 3.8 28.0 (91.9 ft.) Surface 28.0
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07-E-23 1.10 0.02 7.5 26.0 (85.3ft.) Surface 26.0
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07-E-24 0.95 0.05 6.5 102.0 (334.7ft.) Surface 102.0
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07-E-25 1.00 0.03 10.6 64.9 (212.9 ft.) Surface 64.9
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07-E-26 1.77 0.41 18.0 78.0 (255.9 ft.) 6.0 84.0
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including 2.55 1.32 29.0 22.0 (72.18 ft.) 24.0 46.0
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and 2.52 0.05 24.3 16.0 (52.5 ft.) 64.0 80.0
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Drilling will resume in the spring when Sheffield will continue to define both the Engels Mine high-grade mineralization and the historical Moonlight Deposit oxide copper resource. The Company expects to report an NI 43-101 compliant resource for each deposit in 2008.

Quality Control and Assurance

A rigorous Quality Control and Assurance program (QC/QA) is in place, including systematic inclusion of standard sample materials, blank samples, duplicate samples and inter-laboratory check assaying. Samples are sent in sealed containers to ALS Chemex in Reno, Nevada. ALS Chemex is a recognized ISO 9000 registered laboratory. The control samples and duplicate assay results received for the drilling program demonstrated to Sheffield Resources that the assay results reported herein are reliable.

The exploration program is managed by Robert Wetzel, a California registered professional geologist and qualified person. David M. Jenkins, P.Geo., and president of Sheffield Resources is designated the qualified person for the Moonlight Copper Project.

About Sheffield Resources Ltd.

Sheffield Resources Ltd. is an exploration and development company focused on the acquisition and systematic development of copper and nickel/cobalt deposits with potential for large tonnages of ore that are located close to infrastructure in politically stable areas.

This news release may contain forward-looking statements including but not limited to comments regarding the timing and content of upcoming work programs, geological interpretations, receipt of property titles, potential mineral recovery processes etc. Forward-looking statements address future events and conditions and therefore involve inherent risks and uncertainties. Actual results may differ materially from those currently anticipated in such statements. Sheffield Resources Ltd. relies upon litigation protection for forward-looking statements.

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