Tyhee reports 25% increase in the measured and indicated gold resource for the Yellowknife Gold Project, NWT, Canada



    TSX Venture: TDC

    VANCOUVER, Oct. 28 /CNW/ - Tyhee Development Corp. (TSX-V: TDC) (the
"Company") today announced a revision to the Yellowknife Gold Project
NI 43-101 resource estimate for the Ormsby and Bruce Lake zones that was
previously announced on April 3, 2008. The new resource incorporates
approximately 25,000 m of new drilling. The Measured and Indicated gold
resource has increased by 25% to 1,593,000 ounces of gold, a net increase of
324,000 ounces of gold that includes the upgrading of 196,000 ounces of
inferred gold from the April 3, 2008 resource, and an increase of 128,000
ounces of gold from the new drilling.
    "The 324,000 ounces of measured and Indicated gold represents a
significant increase in Tyhee's resource at the Yellowknife Gold Project,"
said Dr. Dave Webb, Tyhee's President and CEO. "This increase is largely due
to targeted drilling within the Ormsby and Bruce Lake zones that was carried
out during 2007 and the spring of 2008. Together with the resource increase
announced on April 3, 2008 (NR S.9, R.6) Tyhee has maintained an average
annual resource growth profile of 200,000 to 250,000 ounces of gold per year
since 2003."

    
    Table 1. Gold Resource on Yellowknife Gold Project (October 28, 2008).
    -------------------------------------------------------------------------
                               Ormsby     Nicholas        Bruce        Total
    Category                     Zone    Main Zone         Zone     Resource
    -------------------------------------------------------------------------
    Measured
    -------------------------------------------------------------------------
                tonnes      3,003,000    1,249,000                 4,252,000
    -------------------------------------------------------------------------
       gold grade (gpt)          3.41         3.81                      3.53
    -------------------------------------------------------------------------
        ounces of gold        329,000      153,000                   482,000
    -------------------------------------------------------------------------

    -------------------------------------------------------------------------
    Indicated
    -------------------------------------------------------------------------
                tonnes      7,898,000    1,484,000      791,000   10,173,000
    -------------------------------------------------------------------------
       gold grade (gpt)          3.42         3.32         3.31         3.40
    -------------------------------------------------------------------------
        ounces of gold        869,000      158,000       84,000    1,111,000
    -------------------------------------------------------------------------

    -------------------------------------------------------------------------
    M&I
    -------------------------------------------------------------------------
                tonnes     10,901,000    2,733,000      791,000   14,425,000
    -------------------------------------------------------------------------
       gold grade (gpt)          3.42         3.54         3.31         3.43
    -------------------------------------------------------------------------
        ounces of gold      1,198,000      311,000       84,000    1,593,000
    -------------------------------------------------------------------------

    -------------------------------------------------------------------------
    Inferred
    -------------------------------------------------------------------------
                tonnes        223,000      955,000      396,000    1,574,000
    -------------------------------------------------------------------------
       gold grade (gpt)          3.14         3.92         2.76         3.52
    -------------------------------------------------------------------------
        ounces of gold         23,000      120,000       35,000      178,000
    -------------------------------------------------------------------------
    Ormsby and Bruce Zones at 1.25 gpt cut-off are revised and presented
    here.
    Nicholas Lake Main Zone at 1.1 gpt cut-off  has been reported previously.
    Figures are rounded for presentation
    

    The Ormsby and Bruce Lake resource was calculated using inverse distance
squared estimations of 3 m cubic blocks constrained by geology. A search
ellipsoid of 90 x 60 x 30 m was employed. All assays are composited into 1.5 m
lengths, and composites have a top-cut of 100 gpt gold. The Nicholas Lake
resource was reported April 3, 2008 (NR S.9, R.6) and was calculated using
inverse distance squared estimations of 1.5 x 5 x 5 m blocks located in two
domains. A search ellipsoid of 50 x 34 x 5 m at elevations above 100 m and
60 x 40 x 5 m below this elevation was employed.

    Ormsby and Bruce Lake Geology

    The Ormsby and Bruce Lake deposits are exposed over 2.6 km on surface, in
the Ormsby decline, in subdrifts, in crosscuts and in drill core. Gold
mineralization occurs in association with sulphides and silicification in
weakly foliated but strongly lineated brecciated metavolcanic amphibolite.

    Nicholas Lake Main Zone Geology

    A 300 m by 200 m leucocratic felsic intrusive of quartz diorite to
granodiorite composition is the host for the Nicholas Lake gold deposit.
Auriferous quartz-sulphide veins occur in a shear zone within, and on the
southern margin of the intrusion. Gold is closely associated with fractures
and open space fillings in sulphides or alone within quartz. Scheelite occurs
throughout the granodiorite in concentrations of up to 20,000 ppm tungsten.
Underground development allowed access at approximately 90 metres below
surface.

    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 belt, 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. A Preliminary Assessment released on July 17, 2008 (NR S.9, R.11)
demonstrated positive economics. Additional gold properties have been acquired
within the Yellowknife Gold Belt and exploration of these targets has
confirmed significant gold values over multiple metres on two of the three
grassroots properties reported. An aggressive drill program has been completed
and assays will be released as they are received and compiled. As reported in
NR S.9, R.18, (October 17, 2008) all drills remain on the property but are
currently inactive.
    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.

    
    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:

For further information: Tyhee Development Corp., David Webb, President
and CEO, Tel: (604) 681-2877, (toll free 1-866-681-2877), info@tyhee.com; The
Equicom Group Inc., Tom McMillan, Tel: (403) 536-5903,
tmcmillan@equicomgroup.com

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Tyhee Gold Corp.

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