Sheffield Resources Ltd.
TSX VENTURE : SLD
FRANKFURT : S2Q

Sheffield Resources Ltd.

November 27, 2007 16:31 ET

Sheffield Intersects 81.6 Metres (268 ft) of 1.66% Copper

VANCOUVER, BRITISH COLUMBIA--(Marketwire - Nov. 27, 2007) - Sheffield Resources Ltd. ("Sheffield") (TSX VENTURE:SLD)(FRANKFURT:S2Q) is pleased to announce additional assay results from the ongoing diamond drilling and underground sampling programs focused on the Engels Mine copper prospect at the Moonlight Copper Project located 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-7 0.67 0.0230 4.9 20 (65.6 feet) 0.0 20.0
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0.45 0.00 1.1 32 (105.0 feet) 82.0 114.0
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0.87 0.09 6.6 50 (164.0 feet) 172.0 222.0
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Including 1.69 0.132 13.6 10 (32.8 feet) 172.0 182.0
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And 1.32 0.196 10.6 10 (32.8 feet) 194.0 204.0
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And 1.14 0.11 7.7 12 (39.4 feet) 210.0 222.0
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07-E-8 3.12 0.26 25.1 19.8 (65.0 feet) 54.0 73.8
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Including 7.84 0.74 63.7 6 (19.7 feet) 58.0 64.0
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07-E-9 LOST HOLE
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07-E-10 1.85 0.056 12.8 8.4 (27.6 feet) 98.0 106.4
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Including 3.0 0.092 21.3 4.6 (15.1 feet) 100.0 104.6
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07-E-11 1.11 0.081 11.14 102 (334.7 feet) 0.0 102.0
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Including 2.43 0.083 15.4 24 (78.7 feet) 32.0 56.0
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07-E-12 1.06 0.228 9.6 38 (124.7 feet) 0.0 38.0
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Including 2.74 0.51 23.0 2 (6.6 feet) 0.0 2.0
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And 3.42 0.34 39.0 2 (6.6 feet) 20.0 22.0
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07-E-13 1.66 0.033 16.0 81.6 (267.7 feet) 0.0 81.6
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Including 2.59 0.044 29.3 38 (124.7 feet) 38.0 76.0
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Including 3.57 0.065 66.5 8 (26.5 feet) 38.0 46.0
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And 3.79 0.088 52.0 8 (26.5 feet) 52.0 60.0
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And 3.14 0.032 9.0 10 (32.8 feet) 66.0 76.0
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07-E-14 0.88 0.033 TO COME 54 (177.2 feet) 0.0 54.0
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Including 6.28 0.28 TO COME 2 (6.6 feet) 38.0 40.0
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07-E-15 1.10 0.021 TO COME 30 (98.4 feet) 0.0 30.0
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07-E-16 1.92 0.148 TO COME 20 (65.6 feet) 0.0 20.0
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Including 3.685 0.425 TO COME 4 (13.1 feet) 12.0 16.0
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The current drill program is designed to define high-grade copper mineralization which may be mined in the initial starter pit of a copper heap leach mine at the Moonlight Project.

Drill hole 07-E-7 was drilled to define the western extent of mineralization at Engels Mine prospect. Eighteen metres from 2-20m average 0.67% copper. This intersection in combination with trenching results strongly suggests the copper mineralization has a minimum outcrop width on the order of 125m. Furthermore, the 50m thick intersection from 172m-222m averages 0.87% copper. This deeper intercept may represent a part of a sizable sulfide resource left unmined by the historic operation.

Holes 07E-8 and 07E-9 were drilled from the footwall side of the Main Zone in order to define the footwall of the copper mineralization as well as to assess the grade and character of the footwall mineralization. Holes previously drilled by Sheffield from the hanging wall side of the mineralization did not reach the footwall of the mineralization due to poor drilling conditions associated with old mine workings. In drill hole 07-E-8, the 19.8 metre thick interval from 54m to 73.8m averaged 3.14% copper. This intercept is about 10m beyond and below the end of 07E-4 which encountered 37.8m of 3.71% copper and both extends the thickness of high-grade copper mineralization and confirms the high grade character of the mineralization in this area.

Drill hole 07-E-9 encountered a large mine opening and was abandoned before reaching the target zone.

Sheffield located and reopened the portal for the #3 Level at the historic Engels mine. The drifts and crosscuts all ended in caved material. All of the accessible workings were sampled in 3.1m sample lengths. These 22 samples averaged 2.0% Cu. These samples represent a minimum true thickness of 30m. Drill hole 07-E-13, as reported above penetrated 81.6 metres grading 1.66% copper, targeted this zone and confirms the high-grade character of the mineralization. That hole was lost while penetrating good grade mineralization. Holes 07-E-18, 07-E-19, 07-E-24 and 07-E-26 targeting this exciting #3 Zone oxide target have been drilled and assays are pending. Additional core holes in this zone are planned to be completed in the near future.

Drilling continues at the Engels Mine area of the Moonlight Project where hole assays for approximately an additional ten holes are awaited. All holes drilled in the ongoing diamond drill program are HQ gauge.

Dave Jenkins, Sheffield's President, comments, "These drill results continue to expand the area of potentially economic mineralization starting at the surface at the Engels Mine. We are very excited about this project at Engels. 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 at WWW.sheffieldresources.com.

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

An oxide copper resource at the Moonlight Deposit was estimated by a Placer Dome Inc. predecessor company (Placer Development Limited). Sheffield has signed a contract for an 80 hole reverse circulation drill program to provide the data to bring the historical oxide resource up to NI43-101 standards. This program is scheduled to begin by the end of November.

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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