Attention Business Editors:

Tyhee extends mineralization in WK shear zone on BigSky Property, Yellowknife, NWT, Canada

    TSX Venture: TDC

    VANCOUVER, April 29 /CNW/ - Tyhee Development Corp. (TSX Venture, TDC)
(the "Company") today announced that 6 out of 9 drillholes into the WK shear
zone have intersected gold values over a zone which extends in excess of
250 metres in strike length and to a depth of 60 metres (open).
    "We have identified a gold-bearing shear zone over a significant
strike-length, with gold values up to 8.69 gpt over 0.7 metres and 5.87 gpt
over 1.2 metres," said Dr. D.R. Webb, President & CEO of Tyhee. "Additional
shear zones will be evaluated in the current drill program before further
definition drilling is continued on this shear zone as well as other
structures that have demonstrated gold-bearing potential. Upon identification
of additional gold-bearing shear zones, the largest and highest grade
structures will be selected for further work."

    <<
    Results from current diamond drill program on BigSky Property

                      From              To       Thickness      Gold Grade
    DDH            (metres)        (metres)        (metres)           (gpt)

    B003(1)           37.7            38.5             0.8            4.64
    B004(1)           33.3            35.5             2.2            3.46
    Incl              34.8            35.5             0.7            8.69
    And               48.0            49.2             1.2            0.51
    B005              71.4            76.3             4.9            0.64
    Incl              71.4            72.8             1.4            1.18
    And               96.8            98.0             1.2            5.87
    B006              83.8            85.0             1.2            1.35
    B008              31.6            34.9             3.3            2.09
    Incl              32.3            33.6             1.3            4.78
    B013              36.0            38.0             2.0            1.62

    (1) drillholes previously reported
    Drillholes B007, 9 and 10 did not intersect significant gold values in
    WK Shear. Drillholes B011, 12, and 15 to 19 and 23 tested a different
    shear zone as did B022, 26, and 27, none of which intersected significant
    gold values.
    >>

    Diamond drilling is continuing with two drills currently active on the
Ormsby Zone during break-up. The drill on BigSky has been temporarily shutdown
and will restart again in May. Additional targets on Clan Lake, Goodwin Lake
and at Nicholas Lake will be drilled as the three drills on our properties
become available.

    About Tyhee Development Corp.

    Tyhee Development Corp. is a gold exploration and development company
currently focused on the historic Yellowknife Gold Camp, NWT, Canada. It is
the largest property holder in the historic camp, and has the largest
exploration and development program underway in the region. Its principal
asset is the advanced-stage Yellowknife Gold Project, which consists of
6,625 hectares (15,481 acres) of mining leases located 90 km (56 miles) north
of Yellowknife, NWT, Canada. Three additional gold properties have been
acquired within the Yellowknife Gold Belt and further acquisitions are being
considered.
    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 also
conducted 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. V. Pratico, P.Geol., the
designated QP within the meaning of NI 43-101, has reviewed this release and
approves of its content.

    To view a map of the BigSky Drill Program, please visit:
    http://files.newswire.ca/476/BigskyDrillProg.pdf

    NO REGULATORY AUTHORITY HAS APPROVED OR DISAPPROVED THE CONTENT OF THIS
    RELEASE. THE TSX VENTURE EXCHANGE DOES NOT ACCEPT RESPONSIBILITY FOR THE
    ADEQUACY OR ACCURACY OF THIS RELEASE.

    Tyhee's shares trade on the TSX Venture Exchange under the symbol "TDC".
For additional information, please visit the Company's website, www.tyhee.com.

For further information: Tyhee Development Corp., David Webb, President
and CEO, Tel: (604) 681-2877, toll free 1-866-681-2877, info@tyhee.com