Drilling Continues to Intersect & Expand Mineralization at Niblack

Niblack Mineral Development Inc. ("Niblack" or the "Company") (TSX VENTURE:NIB)
announces the results from twenty-three (23) new holes completed by joint
venture partner Heatherdale Resources Inc. ("Heatherdale") (TSX VENTURE:HTR) at
the Niblack volcanogenic massive sulphide (VMS) project in southeast Alaska.
Drill holes continue to intersect and expand the precious metals enriched
mineralized zones, and are expected to increase mineral resources. 


To date, Heatherdale has completed 129,985 feet of underground drilling in 100
holes at Niblack using two rigs. At March 2011, 308 holes (drilled from surface
and underground) were used to estimate the mineral resources for the Lookout and
Trio deposits (see March 7, 2011 news release). At a US$50 NSR cut off , the
estimate comprises 4.1 million tonnes of Indicated resources grading 1.13%
copper, 2.32 g/t gold, 2.27% zinc and 38.70 g/t silver and 2.5 million tonnes of
Inferred resources grading 1.21% copper, 1.77 g/t gold, 2.29% zinc and 25.90 g/t
silver. A continuous 1.5 million-tonne high-grade zone occurs within the
indicated resource, grading 1.73% copper, 3.50 g/t gold, 3.84% zinc and 61.60
g/t silver (at US$150 NSR cutoff). 


The results show that the geological model for Niblack is successfully targeting
new mineralization. Key intersections were encountered in the Lookout deposit
(U128), the Mammoth zone (U112 and U114), and a new zone between the Lookout and
Trio deposits (U110, U113, U117, U121 and U123), which are presented in the
Niblack Assay Table below. Drill hole location maps are available at
http://niblack.com/project_areas/united_states/niblack/.




NIBLACK ASSAY TABLE                                                         
----------------------------------------------------------------------------
Drill Hole            From            Intercept                             
 Number              (feet) To (feet)     (feet)   Cu % Au g/t   Zn % Ag g/t
----------------------------------------------------------------------------
U110                1362.2    1370.0        7.8    0.67   1.73   0.93     23
----------------------------------------------------------------------------
U112                 472.0     491.0       19.0    3.32   0.49   3.14     28
----------------------------------------------------------------------------
U112       incl.     472.0     479.3        7.3    6.78   0.99   7.07     59
----------------------------------------------------------------------------
U113                1356.5    1373.0       16.5    0.31   0.40   3.61      4
----------------------------------------------------------------------------
U113       incl.    1356.5    1366.0        9.5    0.30   0.48   5.16      4
----------------------------------------------------------------------------
U114                 504.5     510.2        5.7    4.15   0.72   1.36     29
----------------------------------------------------------------------------
U114                 535.5     540.0        4.5    0.15   0.24   2.28      4
----------------------------------------------------------------------------
U117                1472.0    1473.0        1.0    3.56   0.41   0.02     15
----------------------------------------------------------------------------
U121                1588.4    1592.0        3.6    0.85   0.42   0.82     10
----------------------------------------------------------------------------
U123                1648.0    1655.8        7.8    1.67  19.51   3.32    263
----------------------------------------------------------------------------
U123                1705.0    1710.0        5.0    0.07   1.99   0.44      6
----------------------------------------------------------------------------
U128                 880.0     885.0        5.0    0.58   0.77   0.27     18
----------------------------------------------------------------------------
U128                 890.4     898.4        8.0    0.99   2.23   1.68     40
----------------------------------------------------------------------------
U128                 909.7     954.7       45.0    1.06   1.66   1.85     31
----------------------------------------------------------------------------
U128       incl.     910.5     929.4       18.9    1.90   3.12   1.60     57
----------------------------------------------------------------------------
                                                                            
No significant results U105-U109, U111, U115, U116, U118-120, U122, U125-   
127; Assays pending for U124B                                               



Drilling proceeded in fan patterns from underground drill stations. True widths
of intersections have not yet been accurately established.


Lookout Deposit 

Hole U128 was drilled to further define the resource model in the southwest part
of the Lookout deposit. Mineralization was encountered three times in the hole;
the most significant intersection is 45 feet grading 1.06% copper, 1.66 g/t
gold, 1.85% zinc and 31 g/t silver and including a 19-foot interval of higher
copper and gold grades. 


Mammoth Zone 

The exploration drift is collared into the Mammoth zone. It sits within the
prospective felsic stratigraphy, approximately 3,000 feet northwest of the Trio
deposit. Historically, narrow widths of sea floor accumulation style
mineralization were intersected in several holes in this area but limited drill
efforts had been made to extend those intersections along strike or down dip.
The Heatherdale team reviewed the historic data and designed a series of drill
fans to better assess these mineralized zones. Significant intersections were
encountered in drill holes U112 and U114, indicating good potential. Follow up
drilling is required to delineate mineral resources at Mammoth.


New Zone between Lookout and Trio with high gold grades 

A series of six holes were drilled to target deeper mineralization in the felsic
sequence that lies between the Trio and Lookout deposits, testing an exploration
hypothesis for a repetitive zone of mineralization at depth beyond the Lookout
deposit. Five of the six holes encountered mineralization, including Hole U123,
which intersected copper grades of 1.67%, high grade gold of 19.51 g/t, and
significant silver grades of 263 g/t over 7.8 feet. This new zone will add to
the overall tonnage estimate for the deposit. The zone remains open and drill
testing is ongoing.


Modeling has shown that the host horizon extends over 6 miles (10 km) on the
property, of which only about 1.2 miles (2 km) has been well tested by the
successful drilling campaigns in the Lookout area. A summer program of surface
work, including detailed geological mapping, sampling and diamond drilling has
commenced, designed to test additional priority targets along the favorable
felsic stratigraphy. 


"Drilling over the past two years has affirmed the potential of the Niblack
Project. The volume and grade of mineral resources at Lookout and Trio announced
earlier this year, established a base to advance the project. Exceptional
potential exists to build on this threshold of mineral resources as shown by
today's results. Initial engineering and technical studies for the completion of
a Preliminary Economic Assessment, as well as the foundation for a
prefeasibility study for the project are also underway," said Niblack President
and CEO John Williamson. "This work is progressing well, with additional
releases of results to come over the next few months."


Niblack's location at tidewater on Prince of Wales Island in southeast Alaska
presents a number of 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 km) from Ketchikan, a community of
8000 people with important services to support project development, including a
deep water port and international airport. The State's burgeoning minerals
industry also enjoys a competitive tax regime and stable, predictable permitting
and regulatory oversight coordinated by the Alaska 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 km)
to the northwest of Niblack on Admirality Island.


About Niblack Mineral Development Inc.

Niblack Mineral Development Inc. (TSX VENTURE:NIB) is an exploration and
development company with a number of mineral rich assets in South East Alaska.
The Corporation's principal asset is the Niblack advanced stage
copper-gold-zinc-silver project. Since June 30, 2009 the Niblack Project has
been a joint venture managed by Heatherdale Resources Limited (a Hunter
Dickinson Company), which has spent US$15 million to earn a 51% interest in the
project and is currently sole funding exploration expenditures of US$10 million
to increase their interest to a 60%, with an option to increase their interest
to 70% by sole funding the completion of a bankable feasibility study. 


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.


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

Sample preparation and analysis for the Niblack project is done at ISO 9001
accredited ALS Chemex laboratories in Vancouver, BC. All samples are assayed for
gold by 30 g fire assay fusion with Atomic Absorption Spectroscopy (AAS) finish.
Copper, silver, zinc, lead and 29 additional elements are determined for all
samples by four acid digestion, followed by ICP-AES finish. All over-limit
copper, zinc or lead results (greater than 10%) and all over-limit silver
results (greater than 200 grams per tonne) are re-assayed by high grade single
element four acid digestion ICP-AES or AAS analysis. As part of a comprehensive
QA/QC program, one standard is inserted into the sample stream in each group of
20 samples, as well as one or more field blanks in each analytical batch. One
sample in each group of 20 is a duplicate, which is analyzed by Acme Analytical
Laboratories in Vancouver.


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.