NIB Niblack Mineral Development

Niblack Mineral Development Inc. ("Niblack" or the "Company") (TSX VENTURE:NIB)
announces that delineation drilling at the Niblack gold-copper-silver-zinc
project in southeast Alaska continues to deliver superb and improving results,
further expanding a newly discovered polymetallic volcanogenic massive sulphide
(VMS) deposit on the Niblack property.


Niblack's joint venture has completed 35,000 feet of drilling in 23 holes from
six underground drill stations. Assay results from the last 14 of these holes,
released today, indicate that the precious metals-enriched system located
southwest of the known Lookout deposit continues to expand and remains open in
several directions.


"The assay results released today confirm the continuity of high-grade VMS
mineralization at Niblack, and reflect a consistently strong and improving grade
profile and growing resource base," said Heatherdale President & CEO Dave
Copeland. "The findings validate our geological team's growing knowledge of the
precious metals-enriched system we're seeking to delineate, and enhance our
confidence that we will define a polymetallic VMS deposit with the grades,
volume and other characteristics necessary to support an economically robust
underground mining operation in future."


The Drill Program:

Important intersections from the 14 drill holes (U039-U052) released today are
presented in the 'Niblack Assay Table' at the end of this release. Assay results
from the first nine holes drilled, representing 15,000 feet of drilling, were
released previously (see March 19, 2010 news release). A drill hole location
section is available at www.niblack.com.


The initial 25,000 foot drill program is complete and the second phase of the
program is well underway. Two underground drill rigs are currently working to
further expand the strike length of the newly discovered gold-copper-silver-zinc
system located adjacent to the Lookout zone. The Lookout zone is one of six
known VMS deposits within the 10 square mile Niblack property. 


The 23 holes drilled at Niblack since fall 2009 were collared at six underground
drill stations utilizing a fan pattern designed to cross cut the mineralized
target horizon southwest of the Lookout deposit. To date, the true widths of the
intersections have not been firmly established. Systematic, step-out drilling
will continue for the balance of 2010 to expand the dimensions of the high-grade
VMS deposit and demonstrate the strength and continuity of the
gold-copper-silver-zinc mineralization. 


"We fully intend to continue our investment at Niblack to move the project
forward in a timely and efficient way. Over the next several months, two
underground drills will complete an additional 50,000 feet of underground
drilling for the purpose of further developing the geological model for the
project," said Heatherdale President & CEO Dave Copeland. 


Niblack's location at tidewater on Prince of Wales Island in southeast Alaska
presents a number of compelling project benefits - including year-round marine
access, a well-trained labour force, a mature supply and service sector,
proximity to Asian markets, and the support of community and Alaska Native
corporation partners. The project is located 27 miles (44 kilometres) from
Ketchikan, a community of 8,000 people with important services to support
project development, including a deep water port and international airport. 


The State of Alaska's burgeoning minerals industry also enjoys a competitive tax
regime and stable, predictable permitting and regulatory oversight coordinated
by the Department of Natural Resources' 'Large Mine Permitting Team'. For
reference, Hecla's Greens Creek, a 2,100-ton per day underground massive
sulphide mine, operates 225 miles (370 kilometres) to the northwest of Niblack
on Admiralty Island.


Peter Kleespies, P.Geol., a Qualified Person as defined under National
Instrument 43-101, is supervising the exploration and quality assurance and
quality control programs on behalf of Niblack and has reviewed the content of
this release.


About Niblack Mineral Development Inc. 

Niblack Mineral Development Inc. (TSX VENTURE:NIB) is a Tier 1 Canadian
exploration and development company whose principal asset is a 100% owned,
advanced-stage, gold-rich VMS deposit containing gold, silver, copper and zinc.
This project is currently joint ventured to and operated by Heatherdale
Resources Limited, (Hunter Dickinson Company) which has the right to earn a 51%
interest in the Niblack project by investing US$15 million over three years, and
an option to acquire up to a 60% interest from Niblack Mineral Development Inc.
(formerly CBR Gold Corp.) by investing an additional US$10 million and 70% by
completing a bankable feasibility study. The Company also owns the Khayyam and
Ruby Tuesday Properties, which are within 18 miles (30 kilometres) of the
Niblack Project.


Niblack Mineral Development Inc. is a member of the Discovery Group of
companies, for more information on the group visit www.discoveryexp.com.


On behalf of the Board

Niblack Mineral Development Inc. 

John Williamson, President, CEO & Director



                               NIBLACK ASSAY TABLE
-----------------------------------------------------------------------
Drill Hole                 From      To  Intercept    Cu   Au        Ag
Number                    (feet)  (feet)     (feet)    %  g/t  Zn % g/t
-----------------------------------------------------------------------
U039                     1042.3  1053.4       11.1  1.08 2.13  2.38  57
-----------------------------------------------------------------------
U039       incl.         1042.3  1046.2        3.9  1.21 3.96  3.71  81
-----------------------------------------------------------------------
U039                     1171.9  1175.8        3.9  1.67 3.32  0.61  77
-----------------------------------------------------------------------
U040                     1366.5  1368.2        1.7  0.60 3.55  1.32  15
-----------------------------------------------------------------------
U041                     1102.0  1115.7       13.7  2.30 4.09  0.94  67
-----------------------------------------------------------------------
U041       incl.         1102.0  1111.0        9.0  2.60 5.18  0.90  81
-----------------------------------------------------------------------
U041                     1144.5  1174.0       29.5  1.06 1.38  1.17  28
-----------------------------------------------------------------------
U042                     1306.0  1322.0       16.0  0.54 1.07  0.63  13
-----------------------------------------------------------------------
U043       No significant results
-----------------------------------------------------------------------
U044                     1051.0  1061.5       10.5  2.03 3.14  1.14  55
-----------------------------------------------------------------------
U044       incl.         1051.0  1056.0        5.0  2.60 4.54  1.37  79
-----------------------------------------------------------------------
U044                     1068.6  1080.7       12.1  1.14 2.24  1.89  45
-----------------------------------------------------------------------
U044                     1085.0  1125.0       40.0  1.51 2.14  1.10  41
-----------------------------------------------------------------------
U044       incl.         1085.0  1110.0       25.0  1.83 2.58  1.23  49
-----------------------------------------------------------------------
U045                     1624.5  1627.1        2.6  1.64 2.73  0.29  27
-----------------------------------------------------------------------
U046A                     603.0   615.9       12.9  2.44 2.57  6.06  53
-----------------------------------------------------------------------
U046A      incl.          603.0   608.3        5.3  3.68 4.01  8.19  79
-----------------------------------------------------------------------
U046A      incl.          612.0   615.9        3.9  2.45 2.13  7.83  49
-----------------------------------------------------------------------
U047                     1485.0  1494.8        9.8  1.74 3.09  1.09  49
-----------------------------------------------------------------------
U047                     1507.0  1508.9        1.9  2.23 1.95  0.18  30
-----------------------------------------------------------------------
U048                      596.0   599.7        3.7  1.93 3.64  2.90  70
-----------------------------------------------------------------------
U049                      629.6   644.6       15.0  2.86 1.68 13.09  62
-----------------------------------------------------------------------
U050                      634.0   664.0       30.0  1.62 2.59  1.96  64
-----------------------------------------------------------------------
U050       incl.          649.5   664.0       14.5  2.07 3.74  2.15  83
-----------------------------------------------------------------------
U050       and            649.5   656.5        7.0  2.40 4.26  2.25  99
-----------------------------------------------------------------------
U051       No significant results
-----------------------------------------------------------------------
U052                      666.0   697.9       31.9  1.49 3.78  1.86  85
-----------------------------------------------------------------------
U052       incl.          666.0   678.6       12.6  1.92 6.95  3.25 160
-----------------------------------------------------------------------
U052       incl.          685.0   692.3        7.3  2.06 3.04  1.60  54
-----------------------------------------------------------------------



This release includes certain statements that may be deemed "forward-looking
statements". All statements in this release, other than statements of historical
facts, that address exploration drilling, exploitation activities and events or
developments that the company expects are forward looking statements. Although
the company believes the expectations expressed in such forward-looking
statements are based on reasonable assumptions, such statements are not
guarantees of future performance and actual results or developments may differ
materially from those in the forward-looking statements. Factors that could
cause actual results to differ materially from those in forward-looking
statements include market prices, exploitation and exploration successes,
continuity of mineralization, uncertainties related to the ability to obtain
necessary permits, licenses and title and delays due to third party opposition,
changes in government policies regarding mining and natural resource exploration
and exploitation, and continued availability of capital and financing, and
general economic, market or business conditions. Investors are cautioned that
any such statements are not guarantees of future performance and actual results
or developments may differ materially from those projected in the
forward-looking statements. For more information on the Company, investors
should review the Company's continuous disclosure filings that are available at
www.sedar.com.

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