Tyhee adds significant gold intersections at Clan Lake and BigSky Properties, Yellowknife, NWT, Canada

    TSX Venture: TDC

    VANCOUVER, July 8 /CNW/ - Tyhee Development Corp. (TSX Venture, TDC) (the
"Company") today announced final Phase I diamond drill results from Clan Lake
and BigSky Properties. Clan Lake continues to expand with drillholes CL115 and
CL116 extending the main zone to the south by 30 metres with intersections of
134.9 metres (m) grading 0.81 grams per tonne (gpt) gold including 3.0 m
grading 17.56 gpt gold (CL116) and 102.4 m grading 0.54 gpt including 3.8 m
grading 8.38 gpt gold (CL115).
    "We are pleased to confirm and extend the Main Zone at Clan Lake" reports
Dave Webb, President & CEO of Tyhee. The zone continues to develop, expanding
in strike-length to the south. The zone consists of a pervasively quartz
veined and silicified, altered and mineralized intermediate tuff. Phase II
drilling of an additional 8,300 m of drilling has commenced on Goodwin Lake
and Clan Lake targets."

    Results from current diamond drill program on Clan Lake Property

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

    CL105               43.0            44.0             1.0            1.29
          And           57.4            58.3             0.9            2.92
          And           81.5            82.5             1.0            1.61
          And          108.8           121.0            12.3            2.03
    CL107               68.8            71.0             2.3            0.95
          And           99.5           100.8             1.3            1.82
          And          167.0           167.9             0.8            9.10
    CL108              121.0           122.5             1.5            1.05
          And          129.3           141.8            12.5            2.19
         Incl          138.0           141.0             3.0            6.49
          And          207.5           209.0             1.5            2.22
          And          236.5           238.0             1.5            1.89
    CL110              102.0           103.0             1.0            2.06
    CL113               21.0            21.5             0.5            3.27
          And           35.0            36.5             1.5            1.42
          And           82.9            84.7             1.8            1.63
          And          104.0           106.0             2.0            1.29
          And          124.5           125.5             1.0            4.62
          And          177.0           179.5             2.5            1.24
    CL114               23.0            25.0             2.0            2.04
          And           69.0            71.0             2.0            1.08
          And          160.0           162.0             2.0            1.65
    CL115                4.6           107.0           102.4            0.54
         Incl           21.0            22.0             1.0            2.34
          And           44.3            45.0             0.8            1.90
          And           67.0            68.0             1.0            3.80
          And           73.0            73.4             0.4            2.39
          And           77.0            78.5             1.5            1.18
          And           85.0            86.0             1.0            1.08
          And          103.3           107.0             3.8            8.38
    CL116                3.7           138.5           134.9            0.81
         Incl            7.0             8.5             1.5            2.57
          And           14.0            16.0             2.0            3.55
          And           86.5            89.5             3.0           17.56
          And          127.8           136.0             8.3            1.38
    CL117               50.0            51.5             1.5            1.86
          And          134.0           136.0             2.0            2.00
          And          180.5           182.0             1.5            3.66
    CL118               19.0            22.0             3.0            2.41

    True width cannot be estimated. Drillholes CL111 and CL112 were collared
    too far east to test the Main Zone.

    The Clan Lake Property is 32 km south of Tyhee's Ormsby Zone (19 km south
of the Goodwin Lake Zone) and 27 km north of the Bluefish hydroelectric
complex. The principal gold-bearing zone on the property has been traced on
surface for approximately 300 m (open). Phase one drilling is completed and
all drillholes have been reported. Phase two drilling has commenced and will
test a more northwest-southeast strike to the Main Zone than previously
    The mineralized zone consists of a pervasively silicified and quartz
veined grey to tan coloured fine-grained foliated intermediate ash to lapilli
tuff. Alteration consists of silicification, sericitization and locally
carbonatization with patchy pyrrhotite, pyrite, and arsenopyrite with total
sulphides generally present to less than 5%.

    Results from current diamond drill program on BigSky Property

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

    B014                46.3            47.3             1.0            2.05
    B025               64.41           67.28             2.9            5.57
    B028               86.41           87.41             1.0            1.67
    B030                36.7            38.9             2.2            1.31
    B038                77.5            78.5             1.0            2.50

    Drillholes B020, 21, 24, 29, 31 to 37 and 39 did not intersect
    significant mineralization.

    "The BigSky results have returned the best numbers to date with 2.9 m of
5.57 gpt gold in B025 into the WK Shear" reports Webb. "This adds to the other
holes in this area and extends the mineralized segment to a strike-length of
370 m. This area warrants further drilling to determine if even higher-grade
segments exist"
    B025 intersected a 7.0 m wide zone of chlorite carbonate schists with
variable quartz veining, silicification and sulphides. The other holes
intersected generally similar shear zones. All of the drillholes from the
Phase 1 drill program have now been reported.
    Diamond drilling is continuing with one drill currently active on the
Clan Lake Main Zone and one on the Goodwin Lake VAD Zone.
    Tyhee has made good progress on its Preliminary Assessment on the
Yellowknife Gold Project and expects to publish the results by July 18th 2008.

    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
    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. Samples grading (greater than)10 gpt gold is fire assayed on 30
gram samples 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.


    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.

    To view maps of the Clan Lake and BigSky Drill Programs, please visit:

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

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