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Tyhee Development Corp provides Pre-feasibility Guidance and Exploration Update on the Clan

Monday, April 19, 2010
VANCOUVER, British Columbia (Monday April 19, 2010) -- Tyhee Development Corp. (TSX
Venture, TDC) ("the Company") provides the following update on its 100% Yellowknife Gold
Project, NWT, Canada.
Two new holes reported here, CL146 and CL147 along with the three previously reported
drillholes (3.74 grams of gold per tonne (gpt) over 7.5 metres (m) in CL144, 9.62 gpt over 2.2 m
in CL143) test a gap in the existing resource. Substantial silver occurs with some of the gold
assays, such as CL146 which obtained 8.5 gpt gold and 78.8 gpt silver over 1 metre (from 41.5
to 42.5m). Four diamond drillholes drilled to the southeast of the established resource and
demonstrate that broad areas of low grade gold mineralization extend for several hundred
metres beyond the established resource (CL148 and CL150). CL149 and CL151 were drilled at
the southern extremity of the projected Main Zone and appear to limit the width of the Main
Zone in this direction. A table of the newly reported drillhole results appears at the end of this
release, and a map showing the drillhole locations is appended or is available with this release
at www.tyhee.com.
"The recent results demonstrate that the Clan Lake Main Zone continues to the southeast for an
additional 200 m." reports Dave Webb, President & CEO. The drillholes, while extending the
Main Zone, appear to have lower grades than the overall deposit. "We are confident that the
balance of the drilling already completed and being processed will determine if this is an
isolated pocket of lower-grade material or a general trend." says Webb. "The surface results
suggest the former."
In addition Tyhee has completed its winter road activities, resupplying its camp with 450,000
litres of diesel fuel, propane, and other bulk materials. The winter road has been shutdown and
two self-propelled diamond drills are at Clan Lake. Operations are suspended for breakup with
drilling expected to restart as soon as possible this spring.
A total of 1,485 metres has been completed in 16 drillholes on the Ormsby Zone and 7,140
metres in 21 drillholes Clan Lake Main Zone, for this part of the program. Reporting will
continue over the next few weeks as only 9 of the 21 holes have been reported leaving 12 holes
that are being processed or are in the lab for analysis.
Tyhee is on schedule for the completion of its Preliminary Feasibility Study within the next six to
eight weeks. Metallurgical locked cycle tests on composite ore samples blended from the
principal zones to simulate operating conditions have been completed and confirm previous
results. Quotes on capital items are being gathered. Tailings products for ongoing
environmental studies including cyanide destruction tests and humidity cell studies are being
Tyhee Development Corp. is a gold exploration and development company working to start
production in the historic Yellowknife Gold Camp, NWT, Canada. It is the largest property
holder in this camp and has the largest exploration and development program underway in the
region. Its principal asset, the Yellowknife Gold Project includes the Nicholas Lake, Ormsby,
Bruce, Goodwin Lake, and Clan Lake Gold Zones. All are located on mineral claims and mining
leases 50 to 90 km north of Yellowknife, NWT and are expected to feed a single milling
operation. (Note: only Nicholas Lake and Ormsby Zones are being included for permitting
Tyhee completed fire assays on drill core samples using 30 gram aliquots with ICP-ES finish for
gold analyses, prepared at Acme Analytical Laboratories Ltd. in Yellowknife, and finished at
Acme Analytical Laboratories Ltd in Vancouver. A semi-quantitative multi-element analysis is
run on 0.5 gm aliquot samples leached in a hot aqua regia solution and measured using ICP-ES
techniques. Tyhee conducts a rigorous QA/QC program of inserting blanks and duplicates in
the field and standards in the laboratory. The laboratory conducts their own independent QA/QC
program including inserting their own standards and rerunning samples from pulped material
and reject material. These results were provided to Tyhee. All standards, duplicates, blanks
and check assays returned acceptable results. Mr. Val Pratico, P.Geol., the designated QP
within the meaning of NI 43-101, has reviewed this release and approves of its content. A
portion of the work reported herein has been funded by MineralFields Group through a private
For further information please contact:
Tyhee Development Corp. Envoy Strategic Partners
David Webb, President and CEO Jay Bedard
Tel: 604-681-2877 Tel: 416-977-7778
info@tyhee.com jay@envoystrategicpartners.com
Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the
policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this
Table 1 Recent Assay Results from Current Drill Program at Clan Lake
Grade (gpt)
CL1461 41.5 42.5 1.0 8.50
and 61.5 63.0 1.5 1.54
CL1471 11.7 16.5 4.8 0.40
and 94.0 95.5 1.5 1.23
CL1482 190.5 192.0 1.5 2.03
and 246.5 249.5 3.0 1.25
and 306.5 316.0 9.5 0.83
CL1502 106.5 108.0 1.5 0.67
and 302.0 337.5 35.5 0.30
incl 336.0 337.5 1.5 1.91
CL149 and CL151 did not encounter significant gold mineralization.
1 Drilled into the “Gap” area
2 Drilled to the southeast of the Main Zone

This news release contains forward-looking statements, which address future events and conditions, which are subject to various risks and uncertainties. The Company's actual results, programs and financial position could differ materially from those anticipated in such forward-looking statements as a result of numerous factors, some of which may be beyond the Company's control. These factors include: the availability of funds; the timing and content of work programs; results of exploration activities and development of mineral properties, the interpretation of drilling results and other geological data, the uncertainties of resource and reserve estimations, receipt and security of mineral property titles; project cost overruns or unanticipated costs and expenses, fluctuations in metal prices; currency fluctuations; and general market and industry conditions. Forward-looking statements are based on the expectations and opinions of the Company's management on the date the statements are made. The assumptions used in the preparation of such statements, although considered reasonable at the time of preparation, may prove to be imprecise and, as such, undue reliance should not be placed on forward-looking statements.

Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.