Val-d’Or, Quebec - (MetalsNews,June 12, 2012) - NioGold Mining Corporation (TSX-V:NOX) (OTCQX:NOXGF) (“NioGold”) is pleased to report additional results from the Phase Two drilling program conducted under the terms of the earn-in option of Aurizon Mines (“Aurizon”) on the Marban Block property, located in the Malartic gold camp, Abitibi region of Quebec. These results are in continuation of the previously very encouraging results of the Phase Two published previously (see news release of March 1st and April 26th).

Results from 22 new drill holes and three (3) extensions of previous holes were obtained on the Marban gold deposit and are included in this release.  The drill results are tabled on the following pages.

The new results highlight the presence of wide mineralised intervals, as well as smaller high grade intervals mainly located within the Western High Grade Zone (“WHGZ”), which is located immediately west of the former Marban Mine, from surface down to a depth of 250 metres.

Drilling highlights include:

• The best results from the in-fill drill holes on the WHGZ returned the following:
• 5.13 g/t Au over 6.0 m on section 3700 at a vertical depth of 230 m (MB-12-282)
• 4.67 g/t Au over 13.0 m on section 3675 at a vertical depth of 140 m (MB-12-284)
• 26.10 g/t Au over 1.2 m, 7.28 g/t Au over 7.2 m and 39.50 g/t Au over 1.0 m on section 3650 at a vertical depth of 95 m, 125 m and 130 m respectively (MB-12-297)
• 24.60 g/t Au over 1.2 m on section 3575 at a vertical depth of 30 m (MB-12-300)
• 45.80 g/t Au over 1.0 m on section 3800 at a vertical depth of 75 m (MB-12-306)
• Shallow high grade intervals were also obtained along the Marban deposit:
• 24.20 g/t Au over 0.5 m on section 4350 at a vertical depth of 22 m (MB-12-275)
• 39.10 g/t Au over 1.2 m on section 3950 at a vertical depth of 115 m (MB-12-287)

The 25 holes are distributed along a strike of 950 metres along the Marban deposit and they are contributing to improve the quality of the near surface resource.

The Phase Two drilling program started on December 13, 2011 and concluded on May 31st with a total of 34,656 metres distributed in 90 holes and nine (9) extensions of previous holes. An updated mineral resource estimate based on the Phase One drill results, as well as basic technical studies, including metallurgical test work (see news release of April 24th), should be completed by the end of the second quarter, 2012.

Marban deposit drilling

The 2010-2012 drill programs confirmed the geological model interpreted by NioGold and therefore the continuity of the mineralised zones. They were also instrumental in developing the shallow area called the Western High Grade Zone and identification of the Eastern Down Dip Zone which is located below a vertical depth of 250 metres and remains open at depth and laterally.

Aurizon Option

Aurizon can earn up to a 65% interest the Marban Block property under the terms of an option and joint venture agreement dated July 5, 2010, between NioGold and Aurizon.  The initial 50% interest can be earned by incurring expenditures of $20 million over three years, completing an updated NI 43-101 compliant mineral resource estimate, and by making a resource payment for 50% of the total gold ounces defined by the mineral resource estimate. NioGold remains the project operator during the initial earn-in period (see news release dated July 6, 2010).

Technical Info, QA/QC and Qualified Persons 

Reported intervals are in core lengths but are anticipated to approximate true width, except where structural complexities occur, as the holes were drilled near perpendicular to the principal local structural orientation.

Diamond drill holes were drilled with NQ-size core in order to obtain larger sample volumes of the mineralised zones, except for holes that traversed underground workings which were completed using BQ-size core.  The core was sealed delivered by the drilling contractor to NioGold’s facilities located at the Norlartic mine site.  The core was photographed for reference, logged and mineralised sections were sawed in half.  Sample lengths vary between 0.5 to 1.5 metres.  Half core samples were bagged, sealed and delivered to ALS Chemex in Val-d’Or, Quebec, an accredited laboratory.  The remaining core is stored on site for reference.  Samples were assayed by the fire-assay method using an atomic absorption finish on a 50-gram pulp split.  A quality assurance and quality control program (QA/QC) was implemented by NioGold and the laboratory to insure the precision and reproducibility of the analytical method and results.  The QA/QC program includes the insertion of standards, blanks and field duplicates in the sample batches sent to the laboratory and a systematic re-assaying of samples returning values above 2 g/t Au by the fire-assay method using a gravimetric finish.  As well, pulps grading above 0.5 g/t Au are sent to Bourlamaque Assay Laboratories Ltd. in Val-d’Or for check assaying.

The drilling program is conducted under the supervision of Yan Ducharme, M.Sc., P.Geo. (OGQ), the NioGold Vice president of exploration and a Qualified Person as defined by National Instrument 43-101. The news released was prepared by Mr. Ducharme. 

Drill results – Marban Deposit

NioGold Mining Corporation – « On Canada’s Golden Highway »

NioGold Mining Corporation is a mineral exploration company focused on gold.  The Company’s flagship projects are located in the Cadillac - Malartic - Val-d’Or region of the prolific Abitibi gold mining district Quebec.  The Cadillac, Malartic and Val-d’Or mining camps have produced over 45 million ounces of gold since the 1930’s and presently encompasses six producing gold mines including Osisko Mining’s new Canadian Malartic operations.  NioGold’s land holdings within the Abitibi presently cover 130km2 and encompass four former gold producers, namely the Norlartic, Kierens (First Canadian), Marban and Malartic Hygrade mines that collectively produced 640,000 ounces of gold.  NioGold has outlined Indicated resources of 598,000 ounces gold and Inferred resources of 361,000 ounces gold in and around these deposits.

NioGold’s experienced and qualified technical team are overseeing the advancement of these projects, with current drill programs underway targeting expansion of the resource base.

NioGold invites you to visit the company website at www.niogold.com.  For information on NioGold Mining Corporation contact:

Michael A. Iverson, Chairman & CEO                                  
miverson@niogold.com                                                         
Tel: (604) 856-9887                                                               
Toll-free: (877) 642-6200   

Dale Paruk, Vice-President  
dparuk@niogold.com
Tel: (604) 662-4505

Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this news release.

FORWARD-LOOKING STATEMENTS

This news release includes "forward looking statements", as that term is defined in Section 27A of the Unites States Securities Act of 1933, as amended, and Section 21E of the United States Exchange Act of 1934, as amended, that are subject to assumptions, risks and uncertainties.  Statements in this news release which are not purely historical are forward looking statements, including without limitation any statements concerning the Company's intentions, plans, estimates, expectations or beliefs regarding the future.  Although the Company believes that any forward looking statements in this news release are reasonable, there can be no assurance that any such forward looking statements will prove to be accurate.  The Company cautions readers that all forward looking statements, including without limitation those relating to the Company's future operations and business prospects, are based on assumptions none of which can be assured, and are subject to certain risks and uncertainties that could cause actual events or results to differ materially from those indicated in the forward looking statements.  Readers are advised to rely on their own evaluation of such risks and uncertainties and should not place undue reliance on forward looking statements.

Any forward looking statements are made as of the date of this news release, and the Company assumes no obligation to update the forward looking statements, or to update the reasons why actual events or results could or do differ from those projected in the forward looking statements.  Except as required by law, the Company assumes no obligation to update any forward looking statements, whether as a result of new information, future events or otherwise.

CAUTIONARY NOTE TO U.S. INVESTORS

The United States Securities and Exchange Commission (the “SEC”) permits U.S. mining companies, in their filings with the SEC, to disclose only those mineral deposits that a company can economically and legally extract or produce. We may use certain terms in this news release, such as ‘measured resources’, ‘indicated resources’ and ‘inferred resources’, which the SEC guidelines strictly prohibit U.S. registered companies from including in their filings with the SEC. The news release may contain information about adjacent properties on which we have no right to explore or mine. U.S. investors are cautioned that mineral deposits on adjacent properties may not be indicative of mineral deposits on our properties.

For further information please contact:

Dale Paruk
NioGold Mining
Tel: 604-662-4505
Toll-free 1-877-642-6200
Email: dparuk@niogold.com

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