🕐11.12.08 - 19:01 Uhr

Tyhee News Release - Thursday, December 11, 2008



December 11, 2008 For immediate release
Release: Series 9 Release 16 TSX Venture: TDC
TYHEE ANNOUNCES ADDITIONAL DIAMOND DRILLHOLE RESULTS FROM
GOODWIN LAKE AND CLAN LAKE PROPERTIES, YELLOWKNIFE GOLD BELT, NWT, CANADA
VANCOUVER, BC (December 11, 2008) - Tyhee Development Corp.

(TSX-V: TDC) today
announced the final results of gold assays from the second phase of diamond drilling at
Goodwin Lake and Clan Lake, Yellowknife Gold Belt, NWT, Canada.
Highlighted intersections from the recent program:
Goodwin Lake:
• Drillhole GL022: 35.5 metres (m) of 1.83 grams per tonne (gpt) gold Including:
16.5m of 3.33 gpt gold; and
16.5 m of 1.40 gpt.
• Drillhole GL024 10.5 m of 8.38 gpt gold
• Drillhole GL028: 6.0 m of 2.04 gpt gold
Clan Lake:
• Drillhole CL134: 9.0 m of 1.50 gpt gold; and
4.0 m of 2.01 gpt gold; and
1.0 m of 29.20 gpt gold.
• Drillhole CL137: 11.8 m of 1.27 gpt gold including:
5.8 m of 2.17 gpt gold
• Drillhole CL138: 10.0 m of 1.36 gpt gold; and
4.3 m of 6.99 gpt gold.
• Drillhole CL139: 2.7 m of 6.57 gpt gold
• Drillhole CL140 3.0 m of 13.09 gpt gold; and
4.5 m of 13.93 gpt gold.
• Drillhole CL141 3.0 m of 5.29 gpt gold
"The results from Goodwin Lake, together with the initial 20 drillholes previously reported,
expand the VAD Zone, and define a significant new discovery in the Yellowknife Gold Belt, 13
km south of our established resource at the Ormsby Zone," said Dave Webb, President and
CEO of Tyhee Development Corp.

"While the Clan Lake results continue to expand the
boundary of the Main Zone, additional zones have also been identified both to the east and
west, suggesting the potential for additional gold mineralization at Clan Lake."
The Main Zone of Clan Lake has now been diamond drilled over a 400 m strike length (open)
and in places to a depth of 300 m (open).

While additional drilling will be required to confirm the
continuity of the Main Zone, initial results appear to identify one or more gold-bearing zones
cumulatively ranging up to more than 80 m in width in places within a domain that is up to 100 m
wide.

A resource estimate is being prepared, and is anticipated some time in the first quarter of
2009.
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.

It is 485 m long, up to 65 m wide,
poorly exposed to the northwest, and has not been explored in detail to the southeast
Gold mineralization at Goodwin Lake is constrained within a strataform mafic rock of diorite
composition within turbiditic metasediments.

Macroscopically the rock appears unaltered with
the exception of numerous irregular, discontinuous quartz veins.

Minor sulfide enrichment
accompanies some of the silicification.

Microscopically substantial metasomatism is apparent
with evidence of silicification and potassium enrichment.

Tyhee will review the Goodwin data to
determine if it is possible to establish a resource on the VAD Zone.
Maps that show the drillhole locations can be found at www.tyhee.com
Plans for winter drilling are in place, and the decision to commence will be deferred until late
winter.

Tyhee continues to extract the maximum value from its extensive database, continuing
resource optimization and 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.
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 please contact:
Tyhee Development Corp.

The Equicom Group Inc.
David Webb, President and CEO Tom McMillan
Tel: 604-681-2877 [toll free 1-866-681-2877] Tel: 403-536-5903

Table 1.

Recent diamond drillholes from Goodwin Lake.
DDH From To Thickness Grade
GL021 21.0 22.5 1.5 1.31
and 40.5 42.0 1.5 3.42
GL022 8.5 44.0 35.5 1.83
incl 8.5 25.0 16.5 3.33
and 101.0 102.5 1.5 1.09
and 155.0 171.5 16.5 1.40
incl 162.5 165.5 3.0 2.83
and 168.5 171.5 3.0 2.24
GL023 82.5 84.0 1.5 41.95
and 94.0 95.5 1.5 3.15
GL024 1.5 12.0 10.5 8.38
incl 10.5 12.0 1.5 56.65
and 25.0 31.0 6.0 0.86
GL025 105.0 106.0 1.0 1.41
GL026 60.5 62.0 1.5 1.09
GL027 77.5 79.0 1.5 5.40
GL028 29.0 35.0 6.0 2.04
incl 29.0 30.5 1.5 5.73
True width is not known at this time.
Table 2.

Recent diamond drillholes from Clan Lake.
DDH From To Thickness Grade
CL134 55.5 64.5 9.0 1.50
and 167.9 172.0 4.1 0.84
and 422.0 426.0 4.0 2.01
and 438.0 439.0 1.0 29.20
CL135 5.0 6.5 1.5 1.62
and 9.0 10.55 1.55 1.08
and 53.6 62.8 9.2 1.21
incl 53.6 58.7 5.1 1.80
and 73.7 74.7 1.0 1.45
and 125.4 126.7 1.3 14.23
and 195.5 196.8 1.3 1.88
CL136 99.0 100.0 1.0 26.05
and 138.0 139.0 1.0 1.02
CL137 54.6 55.8 1.2 1.04
and 77.6 88.2 10.6 0.72
incl 77.6 78.5 0.9 3.61
and 123.6 125.0 1.4 1.03
and 148.2 160.0 11.8 1.27
incl 148.2 154.0 5.8 2.17
and 262.3 263.8 1.5 1.56
and 278.5 279.5 1.0 2.56
and 300.0 301.4 1.4 1.74
CL138 44.3 45.6 1.3 1.96
and 56.0 57.2 1.2 2.02
and 62.5 64.0 1.5 1.71
and 72.0 82.0 10.0 1.36
and 250.0 254.3 4.3 6.99
CL139 109.3 128.0 18.7 0.84
incl 109.3 111.5 2.2 4.42
and 163.0 165.7 2.7 6.57
and 288.5 290.0 1.5 1.16
and 312.0 340.0 28 0.73
incl 312.0 314.8 2.8 2.45
incl 337.0 340.0 3.0 2.71
CL140 19.5 21.0 1.5 1.62
and 116.5 119.5 3.0 13.09
and 239.5 244.0 4.5 13.93
CL141 130.0 131.5 1.5 1.18
and 209.4 210.0 0.6 3.96
and 304.0 305.5 1.5 1.34
and 334.0 369.5 35.5 0.78
incl 334.0 337.0 3.0 5.29
CL142 139.5 160.0 20.5 0.82
incl 139.5 141.0 1.5 1.72
and 145.5 147.0 1.5 1.68
and 159.0 160.0 1.0 10.66
and 240.5 241.5 1.0 1.48
True width is not known at this time
?
?
?
648,600 mE
648,800 mE
6,996,400 mN
6,996,200 mN
yhee NWT Corp
Drawn by VP Dec 2008
Goodwin Lake Drill Program
Scale 1 : 2,000
UTM grid NAD83 Zone 11
Diorite
Greywacke
G
14
L0
GL004
0
GL
14
G
0
L0
9
06
G
1
L0
0
G
0L
05
0
GL
13
L0
G
14
18
GL0
41
71
GL014
GL015
G
014
LG
016
L
GL014
GL012
GL014
GL011
0
GL
14
07
GL014
GL008
GL014
GL019
GL
10
4
20
0
0
GL
02
L
01
G
0
G
0L
03
L01
G
4
L02
01
GL
4
02
1
GL014
GL026
L0
G
14
25
4
GL017
GL02
L0
G
14
28
0
GL
14
22
L014
GL023
G
Main Zone Pit
640,200 mE
640,400 mE
640,600 mE
6,979,200 mN
6,979,400 mN
6,979,000 mN
yhee NWT Corp
Drawn by VP Dec 2008
Clan Lake Drill Program
Scale 1 : 2,500
UTM grid NAD83 Zone 11
Massive
Pyroclastics
Intermediate
Flows & Tuff
Mafic
Flows
Fiamme
Tuff
Main Zone
Mineralization Trend Intermediate
Tuff
CL121, 122
CL126
CL119, 120
CL123, 124
CL125
CL127, 128
CL131, 132
CL130
CL129
CL
140
CL133
CLCL
1
14
CLCL
36
1
CLCL
135
CLCL
142
CLCL
134
CLCL
139
CLCL
137
CLCL
138
CLCL




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