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Tyhee announces initial results from 2009 program at Clan Lake property, Yellowknife Gold Belt, NWT, Canada

    TSX Venture: TDC

    VANCOUVER, March 16 /CNW/ - Tyhee Development Corp. (TSX-V: TDC) today
announced the initial results of gold assays from the sampling of its archived
diamond drill core at Clan Lake, Yellowknife Gold Project, NWT, Canada.

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    Highlighted intersections from this recent program:

        -  Drillhole CL001
              -  24.0 m of 2.55 gpt gold, including
              -  7.5 m of 4.18 gpt gold and 21.80 gpt silver; and
        -  Drillhole CL002
              -  16.5 m of 2.01gpt gold including:
              -  4.5 m of 6.38 gpt gold and 7.13 gpt silver, and
        -  Drillhole CL008
              -  7.5 m of 2.47 gpt gold; and
        -  Drillhole CL010
              -  11.5 m of 3.12 gpt gold and 8.95 gpt silver, and
        -  Drillhole CL011
              -  43.5 m of 2.56 gpt gold and 5.06 gpt silver, including
              -  9.0 m of 5.35 gpt gold and 9.35 gpt silver, and
        -  Drillhole CL015
              -  12.0 m of 3.99 gpt gold and 10.09 gpt silver.
    >>

    "These are significant intersections from our archival drill core
database, some of which are step-out holes expanding the size of the Main
Zone" reports Dave Webb, Tyhee's President & CEO. "Prior to Tyhee's
involvement at Clan Lake, only the quartz veined rocks were assayed. We now
recognize that substantial gold occurs within the host breccias, so a program
of relogging, sampling and assaying of these holes is being conducted. These
first 14 drillholes are largely within the existing resource (N.R. S.10 R.2,
January 22, 2009), however some drillholes are step-out holes. For example,
CL008 extends the western boundary of the Main Zone for an additional 25
metres near the north-end towards the Pond Zone."
    Additional drill results are expected from the Clan Lake Pond Zone which
occurs 100 m to the west of the north-end of the Main Zone. This zone has not
been assessed before by Tyhee and to date, no gold resource has been
attributed to the Pond Zone.
    The Clan Lake Main Zone gold mineralization is associated with
silicification, quartz veining, and quartz breccias with significant
pyrrhotite and arsenopyrite disseminations. Previous work included trenching,
diamond drilling, and a bulk sample. The zone is 485 m long, up to 200 m wide,
poorly exposed to the northwest, and has not been explored in detail to the
southeast. There are five subparallel zones over a 1.5 km strike length and
other gold showings occur beyond this. Some of these zones have been drilled
in the past. Portions of the archival core have been assembled by Tyhee for
relogging, sampling and assaying, providing a very cost effective way for the
Company to advance the Clan Lake Property.
    Maps that show the drillhole locations can be found at www.tyhee.com
    Tyhee is extracting the maximum value from its extensive database,
optimizing engineering studies while working to obtain production permits for
its wholly owned Yellowknife Gold Project.

    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.
    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. Val Pratico, P.Geol., Tyhee's
Chief Geologist is the designated QP within the meaning of NI 43-101, has
reviewed this release and approves of its content.

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    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.

    Table 1. Selected results from Clan Lake archival drill core.
    -------------------------------------------------------------------------
                  From            To         Width   Gold Grade  Silver Grade
    DDH        (metres)      (metres)      (metres)      (gpt)      (gpt)
    -------------------------------------------------------------------------
    CL001        38.50         62.50         24.00       2.55
    -------------------------------------------------------------------------
      incl       40.00         43.00          3.00       5.46
    -------------------------------------------------------------------------
      and        55.00         62.50          7.50       4.18      21.80
    -------------------------------------------------------------------------
    CL002        18.00         34.50         16.50       2.01
    -------------------------------------------------------------------------
      incl       30.00         34.50          4.50       6.38       7.13
    -------------------------------------------------------------------------
    CL003        25.50         27.00          1.50       1.36
    -------------------------------------------------------------------------
    CL004        21.75         23.50          1.75       1.49
    -------------------------------------------------------------------------
    CL007        14.00         15.50          1.50       1.62
    -------------------------------------------------------------------------
    CL008         7.00         14.50          7.50       2.47
    -------------------------------------------------------------------------
    CL010         2.00          9.50          7.50       0.83
    -------------------------------------------------------------------------
      And        20.00         31.50         11.50       3.12       8.95
    -------------------------------------------------------------------------
    CL011         1.50         45.00         43.50       2.56       5.06
    -------------------------------------------------------------------------
     incl        12.00         16.50          4.50       6.04       6.67
    -------------------------------------------------------------------------
      and        22.50         31.50          9.00       5.35       9.35
    -------------------------------------------------------------------------
      and        42.00         45.00          3.00       8.00      26.30
    -------------------------------------------------------------------------
    CL012         4.00          5.50          1.50       1.63
    -------------------------------------------------------------------------
      and        20.50         22.00          1.50       1.60
    -------------------------------------------------------------------------
      and        35.50         37.00          1.50      11.52
    -------------------------------------------------------------------------
    CL013         3.00         15.00         12.00       0.66       2.13
    -------------------------------------------------------------------------
    CL014        27.50         38.50         11.00       1.47
    -------------------------------------------------------------------------
    CL015        12.50         24.50         12.00       3.99      10.09
    -------------------------------------------------------------------------
    Drillholes CL005 and CL009 did not intersect significant values. True
    widths are estimated to be greater than 80% of the reported widths.
    >>