direct/ Sheffield Resources Ltd.: Sheffield Resources Acquires Former Copper Mines

VANCOUVER, BRITISH COLUMBIA -- (MARKET WIRE) -- 04/27/2006 -- Sheffield Resources Ltd.´s (Sheffield) (TSX VENTURE:SLD)(FWB:S2Q) wholly owned subsidiary American Sheffield Inc. (ASI) entered into an "Exploration Permit with Option to Lease and Purchase" (the "Agreement") with California-Engels Mining Company ("California -Engels") (PINK SHEETS:CAEN). The Agreement brings under Sheffield´s control approximately 882 acres of patented and fee simple lands (jointly the "Property") containing two famous past producing copper mines. The Property is located approximately 500 to 2000 metres to the east of Sheffield´s Moonlight Project where a temporarily weather halted drill program of up to 30,000 feet (9144 metres) of "HQ" core drilling is being carried on. The drill program is designed to verify and enhance the non-NI 43-101 compliant 180 million tons grading 0.39% copper reported by Placer Dome Inc. ("Placer") for an open pit designed as part of an unrealized mine plan for the Moonlight deposit. Mineralization as drilled by Placer is open to depth and along strike. The terms of the agreement are as follows:

Exploration Permit: Sheffield paid US$20,000 on signing of the Agreement to initiate the Exploration Lease, which has a term of 120 days for completion of due diligence studies and selection of lands to be included in the Mining Lease. The Exploration Permit terminates when Sheffield notifies California-Engels of its decision as to which if any lands Sheffield wishes to include in a Mining Lease.

Mining Lease: Sheffield will pay US$1,000 to initiate the Mining Lease and must as soon as practical submit a NI 43-101 compliant report to the TSX-Venture Exchange. Upon acceptance by the TSX Venture Exchange, Sheffield will issue 50,000 common shares to California-Engels.

On each anniversary of the Exchange acceptance during the currency of the Mining Lease Sheffield will pay California-Engels US$20,000 and will on each of the first two anniversaries issue to that company 100,000 Sheffield common shares.

In the event Sheffield completes a bankable feasibility study on the California-Engels properties or begins construction of a mill for commercial production of mineral products from the property, Sheffield will in the first instance of each event issue to California-Engels 200,000 Sheffield common shares.

Sheffield will during the currency of the Mining Lease perform a minimum of US$25,000 or work on the property and will pay any land taxes assessed against the property.

Purchase of Property: Sheffield may, at a time of its selection and before commencement of commercial mining on the properties, purchase the California-Engels properties that are subject to the Agreement by paying to California-Engels at Sheffield´s election either US$10 million or issuing one million shares of Sheffield common shares. California-Engels reserves for itself the rights to timber on the property and the right to manage said timber as a tree farm. Said timber management activities may not interfere with Sheffield´s exploration or mining activities. In the event Sheffield notifies California-Engels that the timber must be removed to make room for Sheffield´s activity, California-Engels must remove the timber or Sheffield may harvest the timber on behalf of California-Engels and recover Sheffield´s costs by deducting them from the proceeds of the sale of the timber.

California-Engels also reserves for itself the rights to specified dumps of broken rock, which may be sold to third parties or used in maintaining the roads on the property.

California-Engels further reserves for itself a 2% Net Smelter Return Royalty capped at US$25,000,000.

On purchase of the property the annual payments increase to US$60,000 and are deductible from future royalty payments.

The Property

The agreement brings under Sheffield´s control zones of copper mineralization that were mined underground as high-grade deposits by California-Engels during the early 20th Century and were subsequently explored by Placer as large tonnage porphyry copper deposits in the 1960´s.

During the production era the Superior and the Engels mines produced a reported 161 million pounds of copper from 4.5 million tons of ore. George Cavey, P.Geo., in his report of March 22, 2005 reports that Placer determined that at the Engels Mine there is a two million ton open pitable resource (non-NI 43-101 compliant) containing 0.63% copper. According to Placer there is an additional 19 million ton indicated and inferred resource (non-43-101 compliant) grading 0.63% copper. There are smaller tonnages of much higher-grade mineralization included in the above non-NI 43-101 compliant resources.

Cavey also commented on the Superior Mine, describing it as a quartz monzonite hosted stockwork vein system that exhibits porphyry like attributes. Mineralization historically was mined from steeply dipping 8-20 feet thick bornite and chalcopyrite rich veins. Cavey states, "A large body of disseminated copper mineralization has been identified at Superior as the result of work completed by Placer/Amex. They drilled 96 drill holes or approximately 50,200 feet from 1964-1968. Preliminary computerized "ore reserves" (not NI 43-101 compliant) were estimated by Placer/Amex of 43 million tons grading 0.559% Cu with a 0.30% cutoff." Sheffield´s Qualified Person believes the copper mineralization is open to major expansion by further drilling.

These reserve and resource estimates are considered historic, neither Sheffield nor our qualified person have not done sufficient work to classify the historical estimates as current mineral resources or reserves as defined in NI 43-101. Sheffield is not treating the historical estimates as current mineral resources or reserves and therefore the historical estimates should not be relied upon.

The Superior Mine is open with potential access on several levels to areas where the mine openings remain in good shape. Sheffield´s due diligence included reviewing old mine sampling plans and limited check sampling by Robert Wetzel, Moonlight Project Manager and Winthrop Rowe, C.P.G. and Consulting Geologist. Linear sampling along "Level 1" by Placer and check sampled by Sheffield returned the following results in sequence from the Level 1 portal:

Length Copper Grade
-------- ------------

70 feet 0.38%
130 feet 0.77%
200 feet 1.80%
130 feet 0.55%
160 feet 0.38%

Channel samples by Sheffield from the Level 1 drift returned the following:

Length Copper Grade
-------- ------------
110 feet 2.6%

Sequential historical chip channel and percussion drill sampling by Placer/Amex down Crosscut #2 returned:

Length Copper Grade
-------- ------------
50 feet 0.49%
140 feet 1.20%
250 feet 0.47%

Sequential historical chip channel and percussion drill sampling by Placer/Amex sampling down Crosscut #3 returned:

Length Copper Grade
-------- ------------
40 feet 0.56%
160 feet 1.40%
50 feet 0.31%

Sheffield also sampled narrow intervals of much higher-grade mineralization such as:

Length Copper Grade
-------- ------------
6.5 feet 12.9%
4.5 feet 6.8%

Historical chip channel and percussion drill sampling by Placer/Amex sampling along the "Upper Adit (A) Level" was not check sampled by Sheffield, but was reported in mine records to have returned the following results in sequence from the level portal:

Length Copper Grade
-------- ------------
120 feet 0.84%
220 feet 0.43%
70 feet 1.30%
105 feet 0.35%
108 feet 0.85%

Sheffield will have to carry out further comprehensive sampling programs to verify the historical sampling results, to determine their significance and to prove continuity of the wide plus one (1%) percent copper mineralization along strike and up and down dip to other levels in the Superior Mine.
Wetzel believes there is strong potential to prove wide zones of greater than one percent copper mineralization exist. More specifically he believes that they have excellent potential for continuity laterally along strike, continuity up and down dip and that they have good potential for near term profitable mining by low cost block caving or sublevel stoping methods.

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 as an ISO 9000 registered laboratory. The control samples and duplicate assay results received for the drilling program demonstrated to Sheffield Resources that the results are considered reliable. Copper is determined by atomic absorption spectrometry after a four acid digestion of a 0.4-gram aliquot. A second copper determination plus analyses of silver and other metals are made by ICP-AES after a three acid digestion of a 0.4-gram aliquot.

Robert Wetzel manages the exploration program, a California registered professional geologist and qualified person. The technical information in this news release has been prepared in accordance with Canadian regulatory requirements set out in National Instrument 43-101. David M. Jenkins, P.Geo., and President of Sheffield Resources is designated the qualified person for the Moonlight Project.

Effective April 7, 2006, Sheffield has been continued into British Columbia from Alberta. As a result, the Company´s governing corporate legislation is now the Business Corporations Act of British Columbia.

About Sheffield Resources Ltd.

Sheffield Resources Ltd. is a well-funded copper exploration and development company focused on the acquisition and systematic exploration of advanced-stage copper projects with the goal of advancing them to development.

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 recover 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 relies upon litigation protection for forward-looking statements.


Contacts:

Sheffield Resources Ltd.
Mr. David Jenkins
President
(604) 697-9400
(604) 689-7654 (FAX)
info@sheffieldresources.com
www.sheffieldresources.com

SOURCE: Sheffield Resources Ltd.




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