Fronteer Reclassifies Northumberland Resource Ounces

VANCOUVER, BRITISH COLUMBIA, Aug 08 (MARKET WIRE) --
As a result of a review by the British Columbia Securities Commission
(BCSC), Fronteer Development Group Inc. ("Fronteer" or the "Company")
(TSX: FRG)(AMEX: FRG) is issuing the following news release to clarify
its disclosure.

The previously published mineral resource estimate for Northumberland
(see June 5, 2008, press release and NI 43-101 Technical Report, dated
July 28, 2008) included a measured gold resource estimate and an
indicated silver resource estimate within the same volume of rock. The
assignment of the two metals to different mineral resource categories was
intended to reflect the Company's differing confidence levels based on
available data and understanding of each mineralized system.

However, assigning different mineral resource classifications to
different metals within the same volume of rock is no longer considered
acceptable practice under the guidelines set forth by the Canadian
Institute of Mining, Metallurgy and Petroleum Best Practice Guidelines
(as adopted November 2003) and the Canadian Securities Administrators'
National Instrument 43-101.

Fronteer maintains its high-level of confidence in the certainty of its
gold mineral resource, which is defined by more than 1,100 drill holes.
However, not all of these historic holes were assayed for silver.

Fronteer is re-assigning Northumberland's measured gold resource to the
indicated category so that it matches the classification of the
corresponding silver resource.

The total number of ounces in the resource remains unchanged.

As part of Northumberland's current work program, Fronteer is collecting
additional silver data to increase the Company's understanding of the
silver distribution within the deposit. The Company is aiming to convert
silver ounces from the indicated to the measured category, allowing the
project's gold ounces to be reclassified as well.

This press release amends and restates the Company's previous press
release.

Reclassified Northumberland Resource Estimate

--------------------------------------------------------------------------
INDICATED
------------------------------------------------------

Cut-off
Grade Gold Silver
Resource (Au (Au --------------------- ---------------------
Type g/t) opt) Tonnes g/t opt oz g/t opt oz
--------------------------------------------------------------------------
Open Pit
Oxide 0.3 0.01 13,627,000 1.23 0.036 538,000 7.31 0.213 3,202,000
Open Pit
Sulfide 1.0 0.03 22,575,000 2.32 0.068 1,687,000 8.01 0.234 5,815,000
Under-
ground 2.5 0.07 316,000 3.35 0.098 34,000 4.43 0.129 45,000
--------------------------------------------------------------------------
TOTAL 36,518,000 1.92 0.06 2,259,000 7.72 0.23 9,062,000
--------------------------------------------------------------------------
--------------------------------------------------------------------------

--------------------------------------------------------------------------
INDICATED
------------------------------------------------------
Gold
Equivalent
(i)
Resource -----------
Type oz
--------------------------------------------------------------------------
Open Pit
Oxide 602,000
Open Pit
Sulfide 1,803,000
Under-
ground 35,000
--------------------------------------------------------------------------
TOTAL 2,440,000
--------------------------------------------------------------------------
--------------------------------------------------------------------------

--------------------------------------------------------------------------
INFERRED
------------------------------------------------------

Cut-off
Grade Gold Silver
Resource (Au (Au --------------------- ---------------------
Type g/t) opt) Tonnes g/t opt oz g/t opt oz
--------------------------------------------------------------------------
Open Pit
Oxide 0.3 0.01 17,000 2.38 0.069 1,300 10.98 0.320 6,000
Open Pit
Sulfide 1.0 0.03 1,335,000 2.59 0.075 111,000 7.69 0.224 330,000
Under-
ground 2.5 0.07 5,574,000 3.70 0.108 664,000 5.95 0.174 1,067,000
--------------------------------------------------------------------------
TOTAL 6,926,000 3.49 0.10 776,300 6.30 0.18 1,403,000
--------------------------------------------------------------------------
--------------------------------------------------------------------------

--------------------------------------------------------------------------
INFERRED
------------------------------------------------------
Gold
Equivalent
(i)
Resource -----------
Type oz
--------------------------------------------------------------------------
Open Pit
Oxide 1,400
Open Pit
Sulfide 118,000
Under-
ground 685,000
--------------------------------------------------------------------------
TOTAL 804,400
---------------------------------------------- ---------------------------
----------------------------------------------- -------------------------
(i) AuEq calculated at a Au:Ag ratio of 50:1, and assumes 100% recovery of
both metals.

Christopher Lee, P. Geo, Chief Geoscientist for Fronteer Development
Group, is the designated Qualified Person who has prepared the
Northumberland resource estimate. Mineral resources have been estimated
in accordance with the standards adopted by the Canadian Institute of
Mining, Metallurgy and Petroleum ("CIM") Council in November 2003, as
amended, and prescribed by the Canadian Securities Administrators'
National Instrument 43-101 Standards of Disclosure for Mineral Projects.
The mineral resource estimate is as of May 1, 2008 and was conducted
using a combination of Ordinary Kriging (gold) and Inverse-Distance
Weighting (silver) grade interpolations within an 'unwrinkled' 3-D block
model in Gemcom software. A total of 17,149 assays from 1,119 drill holes
(core, RC and rotary drilling) were capped and composited to 10 ft
lengths, then separated into high and low grade domains within three
distinct mineralized horizons, constrained by hand-digitized, 3-D solids.
Each horizon was 'unwrinkled' into a separate flat horizon to facilitate
continuous interpolation across variably dipping segments of the deposit,
then back-transformed into real space. Densities were based on 295 s.g.
measurements and assigned according to lithological proportions in
different areas of the deposit and degree of oxidation. Three different
resource types were defined in order to reflect the different anticipated
costs of extraction for open pit versus underground mining, and heap
leach versus sulfide processing. Cut-off grades for each resource type
were estimated using cost ranges of existing operations for various
parameters, such as mining and processing costs, metal recoveries,
general and administrative, sales and refining costs, and an assumed gold
price of $700 per ounce. The three different resource types are: open pit
oxide and sulfide, based on gold cyanide extraction ratios (oxide
resource equals cyanide leach assay/fire assay greater than 0.5), and
underground, based on depth below surface (2,286-metre elevation,
constrained by preliminary internal Lerchs-Grossman pit optimizations).
Mineral resources were classified according to: (i) geological
confidence, (ii) number of drill holes, and (iii) average distances to
samples used in each block estimate. Further details of the estimation
procedure are available in the amended and restated NI 43-101 report,
which will be posted on SEDAR (www.sedar.com).

LIQUIDITY

Fronteer is not invested in any short-term commercial paper or
asset-backed securities. Fronteer has approximately C$92 million in cash
that is fully liquid and held with a large Canadian commercial bank.

ABOUT FRONTEER

Fronteer is an exploration and development company with a track record of
making big discoveries. Fronteer has a 40% interest in three gold and
copper-gold projects in western Turkey, an extensive portfolio of
advanced stage gold projects in Nevada, and a 42.2% interest in Aurora
Energy Resources (TSX: AXU), a leading Canadian uranium company. Except
for the statements of historical fact contained herein, certain
information presented constitutes "forward-looking statements" within the
meaning of the United States Private Securities Litigation Reform Act of
1995. Such forward-looking statements, including but not limited to,
those with respect to potential expansion of mineralization, potential
size of mineralized zone, timing of resource calculation and size of
exploration program involve known and unknown risks, uncertainties and
other factors which may cause the actual results, performance or
achievement of Fronteer to be materially different from any future
results, performance or achievements expressed or implied by such
forward-looking statements. Such factors include, among others, risks
related to international operations and joint ventures, the actual
results of current exploration activities, conclusions of economic
evaluations, uncertainty in the estimation of ore reserves and mineral
resources, changes in project parameters as plans continue to be refined,
future prices of gold and silver, environmental risks and hazards,
increased infrastructure and/or operating costs, labor and employment
matters, and government regulation and permitting requirements as well as
those factors discussed in the section entitled "Risk Factors" in
Fronteer's Annual Information form and Fronteer's latest Form 40-F on
file with the United States Securities and Exchange Commission in
Washington, D.C. Although Fronteer has attempted to identify important
factors that could cause actual results to differ materially, there may
be other factors that cause results not to be as anticipated, estimated
or intended. There can be no assurance that such statements will prove to
be accurate as actual results and future events could differ materially
from those anticipated in such statements. Cautionary Note to U.S.
Investors Concerning Estimates of Measured, Indicated or Inferred
Resources: The information presented uses the terms "measured",
"indicated" and "inferred" mineral resources. United States investors are
advised that while such terms are recognized and required by Canadian
regulations, the United States Securities and Exchange Commission does
not recognize these terms. United States investors are cautioned not to
assume that all or any part of measured or indicated mineral resources
will ever be converted into mineral reserves. United States investors are
also cautioned not to assume that all or any part of an inferred mineral
resource exists, or is economically or legally mineable. Fronteer
disclaims any intention or obligation to update or revise any
forward-looking statements, whether as a result of new information,
future events or otherwise. Accordingly, readers should not place undue
reliance on forward-looking statements.

NEWS RELEASE 08-17

Contacts:
Fronteer Development Group Inc.
Mark O'Dea, Ph.D, P.Geo
President and CEO
(604) 632-4677 or Toll Free: 1-877-632-4677

Fronteer Development Group Inc.
Richard Moritz
Director, Investor Relations
(604) 632-4677 or Toll Free: 1-877-632-4677
Email: info@fronteergroup.com
Website: www.fronteergroup.com

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