Tyhee increases gold resource at Yellowknife Gold Project

    TSX Venture: TDC

    VANCOUVER, June 20 /CNW/ - Tyhee Development Corp. (TSX Venture, TDC)
today announced that it has completed an update on the gold resource on its
wholly-owned Yellowknife Gold Project. The resource incorporates all available
data as of April 8, 2007, integrating 477 diamond drillholes and 82,514 assays
for the Ormsby, Bruce Lake and West Zones. The Nicholas Lake Main Zone is
included as well, as previously reported by Dupre and Giroux (2003).

    -   The measured and indicated resource has increased 29% to 1,203,000
        ounces of gold.
    -   A further 131,000 ounces of gold have been added to the resource.

    Dave R. Webb, Ph.D., President and CEO of Tyhee advised that "these
results meet our expectations. We have typically added one ounce of gold for
every $25 of exploration expenditure, but these ounces have come in closer to
$20 per ounce. We are very pleased that we have added to our resource at an
improved rate. Importantly, our confidence in the resource has improved as
evidenced by the significant increase to our measured and indicated resource.
    A factor contributing to the increase in the resource is the
incorporation of additional geological features not previously considered.
Continuing improvements to our understanding of the geology on the Yellowknife
Gold Project, specifically at the Nicholas Lake Main Zone and the Bruce Lake
Zone are expected to further contribute to our resources in these locations.
The Bruce Lake Zone is largely defined by wide spaced drilling to shallow
levels (120 metres) and has substantial potential to depth.
    The Yellowknife Gold Project is well situated, within the historic
Yellowknife Gold Camp, only 90 kilometres north of the capital city, and 57 km
north of the Bluefish hydroelectric complex. Year round access to the site is
via a short winter road as well as an all-weather airstrip (20 minute flight
from Yellowknife).
    Diamond drilling continues on site. A third diamond drill has been added
to the project in an effort to intensify the rate of discovery."

    Revised resource, June 2007.
                                     Ormsby   Nicholas      Bruce      Total
    Category                           Zone  Main Zone       Zone   Resource
                         Tonnes   2,617,000     96,000             2,713,000
                Gold grade, gpt        3.38       8.60                  3.57
                 Ounces of gold     284,000     27,000               311,000

                         Tonnes   5,620,000  1,013,000    252,000  6,885,000
                Gold grade, gpt        3.61       6.70       2.68       4.03
                 Ounces of gold     652,000    218,000     22,000    892,000

    Measured plus Indicated
                         Tonnes   8,237,000  1,109,000    252,000  9,598,000
                Gold grade, gpt        3.53       6.87       2.68       3.90
                 Ounces of gold     936,000    245,000     22,000  1,203,000

                         Tonnes   2,004,000    554,000    661,000  3,219,000
                Gold grade, gpt        3.02       5.57       2.79       3.41
                 Ounces of gold     195,000     99,000     59,000    353,000
    Ormsby and Bruce Lake Zones use an ID(2) estimate using a 1.25 gpt cut-
    off and a 100 gpt top cut. A search ellipsoid having 30, 60, and 90 metre
    axes were used in this estimate, in two passes. The first pass considers
    data inside a silicified domain, and the second pass considers data
    outside of the silicified domain. All Ormsby data is constrained to a
    geologically defined solids model. Nicholas Lake Main Zone is reported by
    Dupre and Giroux (2003) using a 1.5 metre minimum mining width, a 2.5 gpt
    cut-off, 96 gpt top cut, using ordinary kriging estimation.

    Resource Details:

    Ormsby Zone

    Gold mineralization occurs within altered northeast-striking Archean
metavolcanic breccias that dip nearly vertical to the northwest. The
silicified and sulphidized breccias contain variable amounts of carbonate,
biotite, and garnet. The gold mineralized portion of the breccia is known as
the Ormsby Zone which measures approximately 1000 metres in length and varies
from 35 to 130 metres in width. The Ormsby Zone is located in the Ormsby
Metavolcanic Member. The Bruce Lake Zone is located in the Discovery
Metavolcanic Member and includes the previously reported West Zone.
    For this resource estimate, a block model of silicification is
interpolated and then the gold block model interpolated in two passes, the
first within the silicification model and the second outside the
silicification model. The resource estimate is the sum of the two passes but
confined within the limits of the Ormsby Zone. The silicification
interpolation search ellipse, with 10, 20, and 70 metre axes, is determined by
the observed extent and orientation of the silicified zones. The gold
interpolation search ellipse, with 30, 60, and 90 metre axes, has the same
orientation as the silicification model and the dimensions are determined by
the observed extent of the gold mineralization. An average specific gravity of
3.04 as measured is used to convert volumes to mass.
    Metallurgical studies confirm previously reported gold recoveries of
greater than 95% using sequential gravity, flotation and cyanidation
techniques from the Ormsby Zone.
    All calculations use fire assay data completed by previous operators as
well as recent fire assay data collected by Tyhee. Tyhee completed fire assays
on drill core and chip samples from the decline on 30 gram aliquots with
ICP-ES finish, prepared at Acme Analytical Laboratories Ltd. in Yellowknife,
and finished at Acme Analytical Laboratories Ltd in Vancouver. Tyhee completed
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. Tyhee also processed check samples at ALS Chemex
Laboratories in North Vancouver for additional confirmation of results. All
standards, duplicates, blanks and check assays returned acceptable results.

    Nicholas Lake Main Zone

    Gold mineralization occurs within quartz-sulphide veins that occur within
or proximal to a deformed and altered quartz diorite that intrudes Archean
metasedimentary rocks. A total of 5,942 fire assays from 143 drillholes and
111 underground chip samples were used. All assays greater than 96 gpt were
capped to 96 gpt. Thirteen veins were modeled using 20 x 20 metre blocks and
true widths or a minimum width of 1.5 metres. The dilution grade was the
average measured grade of the adjacent material for each vein. An average
specific gravity of 2.74 was used to convert volumes to mass.
    Previously reported metallurgical studies using cyanidation reported
recoveries of 93% to 95%.
    Analyses for the previous operator were conducted by fire assay and
screened metallics fire assays. Analyses for Tyhee were conducted by Acme
Analytical Laboratories in Vancouver. All samples were crushed and pulverized,
and analyzed by ICP-ES or ICP-MS for 35 elements with gold determined by
standard fire assay on a 30 gm sample with an ICP-ES finish. A rigorous
quality control program was conducted using duplicate samples, blanks, and
    Mr. D.G. Dupre, P.Geol was the QP within the meaning of NI 43-101 for the
Nicholas Lake Resource which has previously been reported (Sedar, August 22,
2003). Mr. V. Pratico, P.Geol., the designated QP within the meaning of NI
43-101, has reviewed this release and approves of its content.
    A Preliminary Economic Assessment is currently underway with results to
be released once they are received. Additional studies at the Nicholas Lake
Main Zone will lead to a revised estimate for this gold resource expected to
be completed later this year.

    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. Additional gold properties have been acquired within
the Yellowknife Gold Belt and exploration of these targets has commenced.


    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.: Michael Joyner, Tel: (416) 815-0700 ext 275,

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