Tyhee reports positive results from completed drilling programs on the Ormsby and Bruce Lake Zones; commences resource revision



    Release: Series 9 Release 14
    TSX Venture: TDC

    VANCOUVER, Aug. 12 /CNW/ - Tyhee Development Corp. (TSX-V: TDC) (the
"Company") today releases results for the final 36 drill holes on the Ormsby
and Bruce Lake Zones of the Yellowknife Gold Project in Canada's Northwest
Territories.

    
    Highlights from the recent program:

    Bruce Lake Zone:
    -   Hole NDM507:     12.0 metres (m) of 6.18 grams per tonne (gpt) gold;
    -   Hole NDM520:     4.0 m of 11.59 gpt gold; and
    -   Hole NDM523      13.5 m of 4.289 gpt gold.

    Ormsby Zone:
    -   Hole NDM538      13.5 m of 5.67 gpt gold;
    -   Hole NDM533      8.7 m of 5.33 gpt gold; and
    -   Hole NDM533      6.0 m of 7.94 gpt gold.
    

    "The results from the 36 drill holes at Ormsby and Bruce Lake show
significant gold values and are in line with management's expectations," said
Dr. Dave Webb, Tyhee's president and CEO. "Now that we have completed the most
recent phase of our drill program on these two zones, the Company is
proceeding with a revised resource estimate which will further define and
extend the resource previously reported in the technical report dated June
17th, 2008."
    The revised resource estimate, utilizing the 25,000 m of new drill holes
from 2007 plus additional holes drilled in 2008, is currently underway and is
expected to be completed within 60 days.
    Maps of the drill hole locations are attached and are available on
www.sedar.com and www.tyhee.com.

    To view maps of the drill hole, please visit:
    http://files.newswire.ca/476/Ormsby_Drill_BruceLake.pdf

    REVIEWED BY QUALIFIED PERSON, QUALITY CONTROL, AND REPORTS

    Mr. V.V. Pratico P.Geol., the designated Qualified Person within the
meaning of NI 43-101, has reviewed this release and approves of its content.
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.

    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. A recently completed Preliminary Assessment
reported July 17, 2008 (NR S.9, R.11) reports positive economics at 3,000 tpd.
Three additional gold properties have been acquired within the Yellowknife
Gold Belt and further acquisitions are being considered. Results from all
properties have been positive with the Company's current exploration focus
directed to the Clan Lake and Goodwin Lake properties.

    
    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: Recent Diamond Drillholes on Bruce Lake Zone
    -------------------------------------------------------------------------
    Drillhole          From             To           Interval        Grade
    -------------------------------------------------------------------------
                     (metres)        (metres)        (metres)       gpt gold
    -------------------------------------------------------------------------
    NDM506            186.5            192.8             6.3           1.321
    -------------------------------------------------------------------------
         and          196.6            202.3             5.7           2.744
    -------------------------------------------------------------------------
         and          205.4            206.8             1.3           8.496
    -------------------------------------------------------------------------
    NDM507            127.0            128.0             1.0          23.557
    -------------------------------------------------------------------------
         and          138.5            150.5            12.0           6.178
    -------------------------------------------------------------------------
        incl          138.5            142.5             4.0          11.865
    -------------------------------------------------------------------------
        incl          143.5            146.0             2.5           8.672
    -------------------------------------------------------------------------
    NDM520             31.0             32.5             1.5           2.988
    -------------------------------------------------------------------------
         and           76.0             80.0             4.0          11.593
    -------------------------------------------------------------------------
    NDM521             85.0             86.0             1.0           1.602
    -------------------------------------------------------------------------
         and           97.0             98.5             1.5           1.561
    -------------------------------------------------------------------------
    NDM522              6.5              9.0             2.5           2.309
    -------------------------------------------------------------------------
         and           36.0             37.5             1.5           1.604
    -------------------------------------------------------------------------
         and          137.4            138.2             0.8           2.346
    -------------------------------------------------------------------------
    NDM523              0.8              2.5             1.7           3.714
    -------------------------------------------------------------------------
         and           42.6             44.0             1.5           3.130
    -------------------------------------------------------------------------
         and           92.0             93.3             1.3           1.671
    -------------------------------------------------------------------------
         and          103.4            113.6            10.2           2.120
    -------------------------------------------------------------------------
         and          159.0            172.5            13.5           4.289
    -------------------------------------------------------------------------
    NDM524             20.0             33.0            13.0           2.434
    -------------------------------------------------------------------------
    incl               20.0             27.0             7.0           3.824
    -------------------------------------------------------------------------
         and           84.5             90.5             6.0           1.670
    -------------------------------------------------------------------------
    NDM525            141.0            142.6             1.6           1.249
    -------------------------------------------------------------------------
         and          147.0            151.5             4.5           2.579
    -------------------------------------------------------------------------
         and          171.7            173.0             1.3           3.007
    -------------------------------------------------------------------------
    NDM526            231.0            242.7            11.7           0.965
    -------------------------------------------------------------------------
        incl          240.0            242.7             2.7           2.294
    -------------------------------------------------------------------------
    NDM527            323.0            324.0             1.0           1.907
    -------------------------------------------------------------------------
    NDM528            244.0            246.1             2.1           4.495
    -------------------------------------------------------------------------
         and          378.2            380.0             1.8           1.921
    -------------------------------------------------------------------------
    Drillholes NDM517, 518, and 519 did not intersect significant gold values.
    True widths range from 60% to 90% of the interval reported.

    Table 2: Recent diamond drillholes from Ormsby Zone
    -------------------------------------------------------------------------
    Drillhole         From              To           Interval        Grade
    -------------------------------------------------------------------------
                    (metres)         (metres)        (metres)       gpt gold
    -------------------------------------------------------------------------
    NDM508            197.0            198.0             1.0           1.005
    -------------------------------------------------------------------------
         and          216.5            218.1             1.6           2.914
    -------------------------------------------------------------------------
         and          362.0            367.5             5.5           1.082
    -------------------------------------------------------------------------
    NDM512            170.5            175.0             4.5           4.230
    -------------------------------------------------------------------------
         and          230.0            231.0             1.0           3.530
    -------------------------------------------------------------------------
    NDM513            167.0            171.0             4.0           7.932
    -------------------------------------------------------------------------
         and          188.5            196.0             7.5           1.202
    -------------------------------------------------------------------------
         and          203.5            205.0             1.5           2.087
    -------------------------------------------------------------------------
         and          220.0            224.5             4.5           1.681
    -------------------------------------------------------------------------
                      239.5            241.0             1.5           1.558
    -------------------------------------------------------------------------
    NDM514            198.5            200.0             1.5           3.687
    -------------------------------------------------------------------------
         and          206.0            212.5             6.5           1.075
    -------------------------------------------------------------------------
    NDM515             45.5             47.0             1.5           2.091
    -------------------------------------------------------------------------
         and           64.7             66.0             1.3           1.058
    -------------------------------------------------------------------------
         and          134.0            135.5             1.5          67.987
    -------------------------------------------------------------------------
         and          189.5            195.5             6.0           4.364
    -------------------------------------------------------------------------
         and          222.5            227.0             4.5           1.094
    -------------------------------------------------------------------------
         and          261.0            265.5             4.5           5.102
    -------------------------------------------------------------------------
    NDM516             53.5             55.0             1.5           1.365
    -------------------------------------------------------------------------
         and          150.0            151.5             1.5           4.512
    -------------------------------------------------------------------------
         and          160.5            162.0             1.5           1.047
    -------------------------------------------------------------------------
         and          174.0            178.6             4.6           3.011
    -------------------------------------------------------------------------
         and          219.5            222.4             2.9           2.273
    -------------------------------------------------------------------------
    NDM529             65.0             67.0             2.0           1.387
    -------------------------------------------------------------------------
         and          188.5            204.0            15.5           2.311
    -------------------------------------------------------------------------
        incl          200.5            204.0             3.5           8.319
    -------------------------------------------------------------------------
         and          209.5            213.5             4.0           1.040
    -------------------------------------------------------------------------
         and          234.5            236.0             1.5           3.862
    -------------------------------------------------------------------------
    NDM530             99.5            101.0             1.5           4.347
    -------------------------------------------------------------------------
         and          159.0            162.0             3.0           5.064
    -------------------------------------------------------------------------
    NDM531            181.0            229.0            48.0           1.127
    -------------------------------------------------------------------------
        incl          195.0            202.0             7.0           2.622
    -------------------------------------------------------------------------
         and          212.0            218.5             6.5           2.603
    -------------------------------------------------------------------------
    NDM532             81.0             82.5             1.5           2.034
    -------------------------------------------------------------------------
         and          181.5            196.0            14.5           2.076
    -------------------------------------------------------------------------
        incl          181.5            186.0             4.5           2.435
    -------------------------------------------------------------------------
        incl          189.6            196.0             6.4           2.900
    -------------------------------------------------------------------------
         and          209.4            214.0             4.7           1.677
    -------------------------------------------------------------------------
        incl          211.7            214.0             2.3           2.487
    -------------------------------------------------------------------------
    NDM533              5.7             14.4             8.7           5.300
    -------------------------------------------------------------------------
         and           34.0             37.0             3.0           1.669
    -------------------------------------------------------------------------
         and          152.2            158.0             5.8           2.283
    -------------------------------------------------------------------------
         and          276.0            282.0             6.0           7.936
    -------------------------------------------------------------------------
         and          299.5            301.0             1.5           2.259
    -------------------------------------------------------------------------
         and          322.5            325.0             2.6          14.208
    -------------------------------------------------------------------------
    NDM534            170.5            171.8             1.3           2.629
    -------------------------------------------------------------------------
         and          280.0            287.0             7.0           1.401
    -------------------------------------------------------------------------
         and          293.5            294.7             1.1           1.170
    -------------------------------------------------------------------------
    NDM535            218.7            220.0             1.3           3.431
    -------------------------------------------------------------------------
         and          233.8            256.0            22.2           1.968
    -------------------------------------------------------------------------
        incl          233.8            246.5            12.7           2.235
    -------------------------------------------------------------------------
         and          260.5            269.0             8.5           1.089
    -------------------------------------------------------------------------
         and          279.1            283.2             4.0           3.960
    -------------------------------------------------------------------------
         and          287.4            290.2             2.8           1.556
    -------------------------------------------------------------------------
    NDM536             99.0            103.5             4.5           2.604
    -------------------------------------------------------------------------
         and          162.0            164.0             2.0           1.087
    -------------------------------------------------------------------------
    NDM537             31.9             33.0             1.1           1.490
    -------------------------------------------------------------------------
         and          244.9            246.4             1.4           1.323
    -------------------------------------------------------------------------
         and          258.4            292.0            33.6           1.039
    -------------------------------------------------------------------------
         and          294.7            296.0             1.3           1.032
    -------------------------------------------------------------------------
    NDM538             88.0             90.0             2.0           4.627
    -------------------------------------------------------------------------
         and          232.0            233.5             1.5           1.009
    -------------------------------------------------------------------------
         and          254.5            268.0            13.5           5.674
    -------------------------------------------------------------------------
         and          277.0            278.5             1.5          13.300
    -------------------------------------------------------------------------
    NDM539            228.5            231.5             3.0           1.709
    -------------------------------------------------------------------------
         and          237.5            239.0             1.5           4.936
    -------------------------------------------------------------------------
         and          246.5            248.0             1.5           1.422
    -------------------------------------------------------------------------
         and          269.0            278.0             9.0           3.649
    -------------------------------------------------------------------------
    NDM540            247.5            250.5             3.0           0.965
    -------------------------------------------------------------------------
         and          258.0            259.5             1.5           1.069
    -------------------------------------------------------------------------
         and          276.0            283.5             7.5           3.504
    -------------------------------------------------------------------------
    NDM541             10.0             17.5             7.5           1.807
    -------------------------------------------------------------------------
         and          111.5            113.0             1.5           1.475
    -------------------------------------------------------------------------
         and          128.0            129.5             1.5           1.012
    -------------------------------------------------------------------------
         and          244.9            248.0             3.1          10.164
    -------------------------------------------------------------------------
         and          251.0            252.5             1.5           1.078
    -------------------------------------------------------------------------
         and          264.5            267.5             3.0           1.386
    -------------------------------------------------------------------------
         and          282.5            285.5             3.0           4.221
    -------------------------------------------------------------------------
    Drillholes NDM509, 510, 511 did not intersect significant results.
    True widths range from 60% to 90% of the interval reported.
    





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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