News Column

Osisko Reports Fourth Quarter and Year-End 2012 Results

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MONTREAL, QUEBEC -- (Marketwire) -- 02/21/13 -- Osisko Mining Corporation (the "Company" or "Osisko") (TSX: OSK)(FRANKFURT: EWX) is pleased to report that it has generated net earnings of $9.6 million ($0.02 per share) during the fourth quarter of 2012 versus net earnings of $37.8 million in the fourth quarter of 2011 ($0.10 per share).

For the year of 2012, its first full year of operations, the Company generated net earnings of $78.4 million ($0.20 per share) compared to net earnings of $18.0 million ($0.05 per share) in the previous year. The Canadian Malartic Mine, the Company's flagship asset, reached commercial production on May 19, 2011.

Earnings from mine operations for the fourth quarter amounted to $68.1 million compared to $39.5 million in the corresponding period of 2011. For the year, Canadian Malartic generated earnings from mine operations of $239.7 million compared to $79.5 million in 2011.

Sean Roosen, President and Chief Executive Officer, commenting on the results: "Despite the various challenges that we faced, we generated cash from mine operations(1) of $305.6 million, which clearly demonstrates the strength of Canadian Malartic. The past year had its challenges as we continued ramping up Canadian Malartic to its nameplate capacity. In the fourth quarter we were affected by delays in executing a major blast over old underground mine workings which reduced our operating flexibility and impacted our mining plan. We anticipate Canadian Malartic will generate improved and strong cash flow once the ramp up phase is completed later this year."

Highlights

-- Gold production of 101,544 ounces at an average cash cost1 of $903 per ounce for the quarter, 388,478 ounces at an average cash cost of $909 per ounce for the year;-- Operating cash flow(2) of $77.7 million, 66.7% higher than in 2011 for the quarter and $273.7 million for the year;-- Free cash flow(3) of $15.0 million for the quarter;-- Write down of portfolio investments for $16.3 million for the quarter and $19.4 million for the year;-- Completion of the Queenston Mining Inc. acquisition;-- Receipt of modifications to the Canadian Malartic operating parameters.1) Reconciliation of non-IFRS measures is provided under Note RegardingCertain Non-IFRS Measures of Performance of this press release.2) Before change in non-cash working capital items.3) Free cash flow is equivalent to the increase in cash and cash equivalentson the consolidated statement of cash flows for the three months endedDecember 31, 2012.



Fourth quarter production was affected by changes to the mining plan caused by a delay of approximately 60 days in executing a 940,000-tonne blast over previously mined underground stopes, blasting constraints and access to the north pit wall. The delay restricted access to a number of areas and the mine was forced to lay-off contractors and reduced the utilization of the mining fleet. Lower grade material was processed from the available stockpile. Production was also affected by several mill shutdowns to modify crushing and conveying systems and the installation of the second pebble crusher.

The mine operating statement for the production period is as follows:

-------------------------------------------------------------------------- Q4 2012 Q3 2012 Q2 2012 Q1 2012 Q4 2011 --------------------------------------------- Gold sales (ounces) 111,104 95,424 95,675 92,400 75,100 Silver sales (ounces) 74,100 49,751 48,880 52,800 42,100 -------------------------------------------------------------------------- ($000) ($000) ($000) ($000) ($000) --------------------------------------------- Revenues 191,080 158,503 157,134 158,658 128,100 -------------------------------------------------------------------------- Production Costs (101,239) (81,841) (98,837) (71,910) (74,841) Royalties (2,546) (1,998) (2,021) (2,359) (1,933) Depreciation (19,198) (14,605) (15,289) (13,877) (11,800) --------------------------------------------- Total (122,983) (98,444)(116,147) (88,146) (88,574) --------------------------------------------- Earnings from mine operations 68,097 60,059 40,987 70,512 39,526 --------------------------------------------------------------------------



Following the commencement of commercial production, steady improvements have been made despite some setbacks in the fourth quarter and the May 9th fire at the mill which affected production during a 10-day period. Improved productivity at the mine was noted throughout 2012 as the pit floor was further developed, mobile equipment efficiencies improved, and throughput at the mill increased. As the ramp up continues towards the 55,000 tonnes per day nameplate mill capacity, cash cost per ounce is expected to decrease.

Key operating results

(in thousands of Canadian dollars, unless otherwise noted)

-------------------------------------------------------------------------- Q4 2012 Q3 2012 Q2 2012 Q1 2012 Q4 2011 ----------------------------------------Gold Production (oz) 101,544 103,753 92,003 91,178 79,718Gold Sales (oz) 111,104 95,424 95,675 92,400 75,100Average Sale Price (US$/oz) 1,709 1,659 1,605 1,698 1,655Average Market Price (US$/oz) 1,722 1,652 1,609 1,691 1,688Cash Costs per Ounce(4) (C$/oz) 903 864 1,015 860 936Cash Costs per Ounce(4, 5) (US$/oz) 911 867 1,004 858 914Cash Margin per Ounce(4) (US$/oz) 798 792 601 840 741Revenues 191,080 158,503 157,134 158,658 128,100Earnings from Mine Operations 68,097 60,059 40,987 70,512 39,526Net Earnings 9,638 26,156 13,271 29,359 37,802Net Earnings per Share 0.02 0.07 0.03 0.08 0.10Operating Cash Flows(6) 77,725 68,010 50,521 77,437 46,633--------------------------------------------------------------------------4) Reconciliation of non-IFRS measures is provided under Note RegardingCertain Non-IFRS Measures of Performance of this press release.5) Using the average exchange rate for the period.6) Before change in non-cash working capital items.



The production statistics are as follows:

-------------------------------------------------------------------------- Q4 2012 Q3 2012 Q2 2012 Q1 2012 Q4 2011 ----------------------------------------Tonnes Mined (000's)- Ore 3,553 4,853 3,234 4,037 3,549- Waste 7,847 9,215 9,545 8,458 10,590- Overburden 627 1,409 1,740 1,954 1,823 ----------------------------------------Total 12,027 15,477 14,519 14,449 15,962Tonnes Milled (000's) 4,088 3,757 3,236 2,965 2,935Grade (g Au/t) 0.87 0.97 0.99 1.05 0.96Recovery (%) 88.8 88.7 89.2 91.2 88.3Gold production (oz) 101,544 103,753 92,003 91,178 79,718--------------------------------------------------------------------------



Mill operating statistics continue to show progress in all categories.

--------------------------------------------------------------------------- Total Tonnes per Available Operating Tonnage Tonnes per Operating Hours Hours (%) Produced (t) Hour Day---------------------------------------------------------------------------Q2 2011 2,184 1,793 82 2,481,196 1,384 29,894Q3 2011 2,208 1,890 86 3,086,324 1,633 36,742Q4 2011 2,208 1,995 90 2,934,803 1,471 33,733Q1 2012 2,184 1,890 87 2,965,456 1,569 35,728Q2 2012 2,184 1,960 90 3,236,281 1,651 38,074Q3 2012 2,208 2,071 94 3,756,768 1,814 43,181Q4 2012 2,208 2,052 93 4,088,021 1,992 47,535---------------------------------------------------------------------------



Ore Reserves - Canadian Malartic

The table below shows the reserve and resource statement for the Canadian Malartic mine as at January 1, 2013:

Reserve and resource estimates with a lower cut-off grade of 0.31 to 0.34 g/t Au

Tonnes Grade AuCategory (M) (g/t Au) (M oz)--------------------------------------------------------------------------Proven Reserves 48.8 0.89 1.4Probable Reserves 261.8 1.04 8.7 ------------------------------------Proven & Probable Reserves 310.6 1.01 10.1Measured and Indicated Resources 347.3 1.05 11.7Inferred Resources 49.6 0.75 1.2



Compared to the reserves reported in January 2012, there is a reduction of tonnes in part due to the 2012 production, but there is an increase in grade from 0.99 g/t to 1.01 g/t Au.

Earnings

The fourth quarter had several non-cash items which adversely affected the earnings including:

-- i. Provision for impairment of marketable securities held in exploration companies of $10.9 million. The impairment was related to Ryan Gold Corp. in which the Company holds a 9.5% interest. Ryan Gold took an impairment charge on their main exploration property during 2012;-- ii. A reduction in value of $0.66 per share of Queenston Mining Inc. acquired from Agnico-Eagle Mines Limited on November 28, 2012. Under IFRS, the value has to be reduced to the value attributed at the closing of the transaction;-- iii. An increase in tax provision following the position taken by the tax authorities in the valuation of certain credits. In 2011, the tax recovery was related to a tax benefit recognized following the successful commencement of operations at Canadian Malartic.



The tax rate is unusually high during the quarter due to the non-deductible losses/adjustments described above.

Adjusted net earnings(7) including the above mentioned non-cash items would be:

-------------------------------------------------------------------------- Q4 2012 Q4 2011 2012 2011 ----------------------------------Net Earnings 9,638 37,802 78,424 17,997Share-based Compensation 2,017 2,999 9,629 10,779Write Down of Queenston Shares 5,145 - 5,145 -Other Non-Cash Gains/Losses 11,191 (1,788) 14,875 18,721Deferred Income and Mining Tax Expense (Recovery) 20,713 (9,976) 72,300 (7,000) ----------------------------------Adjusted Net Earnings 48,704 29,037 180,373 40,497--------------------------------------------------------------------------



The year-to-date results improved following the full year of operations at Canadian Malartic, which caused depreciation to be higher than the previous year. Finance costs were higher compared to 2011, as in 2011 such costs were capitalized up to commercial production reached on May 19, 2011.

7) Reconciliation of non-IFRS measures is provided under Note RegardingCertain Non-IFRS Measures of Performance of this press release.



Investments

The Company invested $228.8 million in property, plant and equipment during 2012. These investments were mainly focused on the development of the pit and modification to the mill at Canadian Malartic and on the completion of definition drilling work at the Hammond Reef Project.

Queenston Acquisition

On December 28, 2012, Osisko completed the acquisition of Queenston Mining Inc. As part of the transaction, the Company acquired the Upper Beaver Project and a package of lands covering 230 km2 in the rich Kirkland Lake Gold Camp, which has produced over 40 million ounces in past years.

In addition to the $42.3 million spent to acquire the 9.2% interest in Queenston held by Agnico-Eagle Mines, Osisko issued 46,638,799 common shares in exchange for Queenston shares. The acquisition was booked at a fair value of $417.5 million.

A NI 43-101 technical report was issued by SRK Consulting on November 5, 2012 for the Upper Beaver deposit indicating a measured and indicated resources of 1.5 million ounces and 0.7 million ounces of inferred resources.

Tonnes Au Cu Contained Au Contained Cu Category (000's) (g/t) (%)(000's ounces)(000's pounds)----------------------------------------------------------------------------Indicated 6,870 6.62 0.37 1,461 56,006Inferred 4,570 4.85 0.32 712 32,218



Queenston had initiated work to gain access to the deposit via an exploration shaft to provide a better base to conduct exploration drilling. Osisko intends to continue the program complemented by deep holes from surface. Osisko will also pursue an intensive exploration program on previously identified deposits, which could provide mill feed to a regional mill and on new targets. Using an approach that was successful at Canadian Malartic, the Company intends to undertake a major compilation and analysis of the regional exploration and geological data.

Hammond Reef

The Company completed definition drilling work on the advanced stage Hammond Reef project. Osisko has completed over 629,000 metres at Hammond Reef, is finishing an EIA that will be filed in accordance with the accepted terms of reference and will table a feasibility study in the first half of 2013. The project is located approximately 20 kilometres from grid power, and is located 23 kilometres north of the town of Atikokan. Osisko signed a Resource Sharing Agreement with eight first nations groups in December 2010, as well as a Memorandum of Understanding with the Metis Nation of Ontario in April 2012.

Osisko issued a resource estimate prepared by SGS on January 28, 2013, which is summarized as follows:

Hammond Reef Global Resource Estimates

------------------------------------------------------------------------- Cut-offCategory Grade (g/t) Tonnes (M) (g/t) Oz (M)-------------------------------------------------------------------------Measured 0.90 123.5 0.5 3.59-------------------------------------------------------------------------Indicated 0.78 72.9 0.5 1.83-------------------------------------------------------------------------M+I 0.86 196.4 0.5 5.43-------------------------------------------------------------------------Inferred 0.72 75.7 0.5 1.75--------------------------------------------------------------------------------------------------------------------------------------------------



G Mining Services Inc of Montreal, in collaboration with SGS, also estimated resources within a Whittle-optimized pit shell using a base case gold price of US$1,400 per ounce and pit limits that are unconstrained by lakeshores. The optimization yielded two distinct pits separated by approximately 200 metres with an average strip ratio of 1.01. The total in-pit M&I resource for the Hammond Reef gold deposit is 5.31 million ounces of gold at an average undiluted grade of 0.72 g/t Au, based on a derived lower cut-off grade of 0.31 g/t Au (west pit) and 0.33 g/t Au (east pit).

Hammond Reef Undiluted Resource Estimates within US$1,400 Whittle pit shell

--------------------------------------------------------------------------- Cut-offCategory Grade (g/t) Tonnes (M) (g/t) Oz (M)---------------------------------------------------------------------------Measured 0.75 175.3 0.32 4.25---------------------------------------------------------------------------Indicated 0.61 54.1 0.32 1.06---------------------------------------------------------------------------M+I 0.72 229.5 0.32 5.31---------------------------------------------------------------------------Inferred 0.65 13.3 0.32 0.28------------------------------------------------------------------------------------------------------------------------------------------------------



Exploration

The Company continues to pursue value creation through the discovery of new ore deposits. Osisko has several agreements and has staked properties in various gold camps within the Americas.

The Company has been active in the Guerrero District of Mexico where it has accumulated a large land package in an area with operating gold mines and advanced exploration projects.

Building on its flagship Canadian Malartic Mine, the Company hopes to discover and build new gold mines to ensure continued growth. These new projects will be developed only if they meet rate-of-return criteria and the Company has the financial capabilities to conduct such expansion.

Improved Financial Flexibility

During the second quarter, the Company amended its $150 million credit facility with CPPIB Credit Investments Inc. ("CPPIB"), a wholly-owned subsidiary of the CPP Investment Board, with CPPIB making available to the Company an additional $100 million delayed draw term loan. The key terms of the amendment are as follows:

-- The initial cash repayment schedule has been extended by one year to the third quarter of 2013. The reimbursements are based on 50% of free cash flow up to $60 million per annum.-- CPPIB will make available a delayed draw term loan of $100 million for working capital and general corporate purposes. Osisko may draw funds under this facility in $20 million increments, and any funds outstanding are reimbursable by December 31, 2013. No funds were drawn to date on this facility. There are no standby fees related to this tranche.



As part of the agreement, Osisko has agreed to reduce the strike price of share purchase warrants to $10 per warrant for Tranche A (previously $10.75) and Tranche B (previously $19.25). Of the total 12.5 million of warrants, 5.5 million Tranche B warrants can be accelerated at Osisko's discretion if the share price trades at a 50% premium to the exercise price for a period of 15 days. Tranche A warrants expire on September 24, 2014 and Tranche B warrants are set to expire on December 31, 2015.

During the fourth quarter, the Company received from an equipment supplier a non-interest bearing advance of $14.7 million to fund the acquisition of major components as part of the rebuild program. The advance will be repaid over the next two years.

Outlook for 2013

Following the modifications and commissioning of the pre-crushing circuit and the second pebble crushing unit, it is anticipated that mill throughput should be stabilized in 2013. Gold production is estimated between 485,000 - 510,000 ounces for the year. As a result of gaining access to higher grade material in the second half of the year, it is anticipated that gold output will be higher in the second semester. Cash costs are estimated between $780 - $825 per ounce. This anticipates a 9 - 14% cost reduction from 2012.

Capital expenditures for 2013 are estimated at $220 million as follows:

--------------------------------------------------------- ($Million) --------------------Canadian Malartic 98Hammond Reef 10Upper Beaver 70Exploration 42 -------------------- 220---------------------------------------------------------



The Company expects to release the Hammond Reef Feasibility Study in the first semester of the year.

Following the acquisition of Queenston Mining on December 28, 2012, the Company has assumed the leadership of the Upper Beaver advanced exploration program. It is also focused on integrating the Queenston Exploration group into Osisko. For 2013, focus will be on the initial development of the 1,300 meter exploration shaft, including engineering, design and fabrication of the head frame and hoisting facilities, initial collar excavation and preparation for shaft sinking.

The Company intends to invest $50 million in exploration on its projects in the Americas, including $42 million that will be capitalized.

Nominations

Mr. Charles E. Page was appointed to the Board of Directors on February 21, 2013. Mr. Page was previously a Director and Chief Executive Officer of Queenston Mining Inc. He has over 30 years of exploration experience and in-depth knowledge of the Kirkland Lake Gold Camp.

Mr. Denis Cimon was promoted to Vice President of Technical Services effective January 1, 2013. He will be responsible for the oversight of the technical studies undertaken by Osisko, and he will be focused on optimizing the Canadian Malartic processing plant. He will also coordinate all research projects within the organization.

Mr. Eric Tremblay was promoted to General Manager of Canadian Malartic Mine replacing Mr. Cimon. He will be responsible for all operating activities at Canadian Malartic, ensuring the operations are carried out in a safe manner, in compliance with our operating permits and respecting our commitments to our host community.

Q4 Conference Call Information

Osisko will host a conference call on Friday, February 22, 2013 at 8:00am EST, where senior management will discuss the financial results and provide an update of the Company's activities. Those interested in participating in the conference call should dial in at (416) 981-9000 (Toronto local and international), or 1-800-732-8470 (North American toll free). An operator will direct participants to the call.

The conference call replay will be available from 10:00 a.m. EST on February 22 until 11:59 p.m. EST on March 8 with the following dial in number: (416) 626-4100 or Toll-free 1-800-558-5253, access code 21647923.

Note Regarding Certain Non-IFRS Measures of Performance

This press release contains certain non-IFRS measures, including "cash cost per ounce", "cash margin per ounce", "cash generated from mine operations" and "adjusted net earnings". The Company believes that these measures, together with measures determined in accordance with IFRS, provides investors with an improved ability to evaluate the underlying performance of the Company. Non-IFRS measures do not have any standardized meaning prescribed under IFRS, and therefore they may not be comparable to similar measures employed by other companies. The data is intended to provide additional information and should not be considered in isolation or as a substitute for measures of performance prepared in accordance with IFRS.

Cash cost per ounce

"Cash cost per ounce" is defined as the cost of production of one ounce of gold excluding non-cash costs for a certain period. "Cash cost per ounce" is obtained from "Production costs" and "Royalties" less non-cash "Share-based compensation" and "By-product credits (silver sales)", adjusted for "Production inventory variation" for the period, divided by the "Number of ounces of gold produced" for the period.

Three months ended Year ended December 31, December 31, 2012 2011 2012 2011 --------------------------------------------Gold ounces produced 101,544 79,718 388,478 180,633(in thousands of dollars,except per ounce)Production costs 101,239 74,841 353,827 158,886Royalties 2,546 1,933 8,924 3,284Share-based compensation (579) (881) (2,809) (1,968)By-product credit (silver sales) (2,386) (1,319) (7,020) (3,020)Inventory variation (9,126) 14 109 14,829 --------------------------------------------Total cash cost for the period 91,694 74,588 353,031 172,011Cash cost per ounce 903 936 909 952



Cash margin per ounce (US$ per ounce)

"Cash margin per ounce" is defined as the "Average selling price of gold per ounce sold" in US$ less "Cash cost per ounce" in US$ for the period.

Three months ended Year ended December 31, December 31, 2012 2011 2012 2011 ----------------------------------------Average selling price of gold (per ounce sold) 1,709 1,655 1,669 1,667Cash cost (per ounce sold) 911 914 909 955 ----------------------------------------Cash margin per ounce 798 741 760 712



Adjusted net earnings (loss) and adjusted net earnings (loss) per share

"Adjusted net earnings (loss)" is defined as "Net earnings (loss)" less certain non-cash items: "Write-off of property, plant and equipment", "Share-based compensation", "Unrealized gain (loss) on investments", "Impairment on available-for-sale assets", "Gain on premium of flow-through shares" and "Deferred income and mining tax expense (recovery)".

"Adjusted net earnings (loss) per share" is obtained from the "Adjusted net earnings (loss)" divided by the "Weighted average number of common shares outstanding" for the period.

Three months ended Year ended December 31, December 31, 2012 2011 2012 2011 ------------------------------------------(in thousands of dollars,except per share)Net Earnings for the period 9,638 37,802 78,424 17,997Adjustments:Write-off of property, plant and equipment - 175 617 16,451Share-based compensation 2,017 2,999 9,629 10,779Unrealized loss on investments 5,424 1,604 6,969 10,119Impairment on available-for-sale assets 10,912 - 12,434 -Gain on premium of flow-through shares - (3,567) - (7,849)Deferred income and mining tax expense (recovery) 20,713 (9,976) 72,300 (7,000) ------------------------------------------Adjusted net earnings 48,704 29,037 180,373 40,497Weighted average number of common shares outstanding (000) 391,538 385,427 388,577 383,372 ------------------------------------------Adjusted net earnings per share 0.12 0.08 0.46 0.11



Cash generated from mine operations

"Cash generated from mine operations" is defined as "Revenues" for a certain period less "Production costs" (excluding non-cash "Share-based compensation") and "Royalties". "Cash generated from mine operations" less "Depreciation" and "Share-based compensation" results in "Earnings from mine operations".

(in $000's) Year ended December 31, 2012 -----------------------------Revenues 665,375Mine operating costsProduction costs(1) (350,844)Royalties (8,924) -----------------------------Cash generated from mine operations 305,607Depreciation (62,969)Share-based compensation (2,983) -----------------------------Earnings from mine operations 239,655(1) Production costs net of non-cash share-based compensation presentedseparately.



About Osisko Mining Corporation

Osisko Mining Corporation operates the Canadian Malartic Gold Mine in Malartic, Quebec and is carrying out aggressive exploration and project development elsewhere in Canada and Latin America.

Mr. Luc Lessard, Eng., Senior Vice-President and Chief Operating Officer of Osisko, is the Qualified Person who has reviewed this news release and is responsible for the technical information reported herein, including verification of the data disclosed.

Cautionary Notes Concerning Estimates of Mineral Resources

This news release uses the terms measured, indicated and inferred resources as a relative measure of the level of confidence in the resource estimate. Readers are cautioned that mineral resources are not economic mineral reserves and that the economic viability of resources that are not mineral reserves has not been demonstrated. In addition, inferred resources are considered too geologically speculative to have any economic considerations applied to them. It cannot be assumed that all or any part of an inferred mineral resource will ever be upgraded to a higher category. Under Canadian rules, estimates of inferred mineral resources may not form the basis of feasibility or pre-feasibility studies or economic studies except for Preliminary Assessment as defined under NI 43-101. Readers are cautioned not to assume that that further work will lead to mineral reserves that can be mined economically.

For further information in relation to the Hammond Reef project, please refer to the "Technical Report on the Hammond Reef Gold Property Atikokan area, Ontario" dated December 20, 2011. For further information in relation to the Canadian Malartic project, please refer to the "Feasibility Study - Canadian Malartic Project (Malartic, Quebec)", dated December 2008. Both of these reports are available under the Osisko profile at www.sedar.com.

For further information in relation to the Upper Beaver project, please refer to the "Technical Report on the Upper-Beaver Gold-Copper Project, Ontario, Canada" dated November 9, 2012, which is available under the Queenston profile at www.sedar.com.

Forward-Looking Statements

Certain statements contained in this press release may be deemed "forward-looking statements". All statements in this release, other than statements of historical fact, that address events or developments that Osisko expects to occur, are forward looking statements. Forward looking statements are statements that are not historical facts and are generally, but not always, identified by the words "expects", "plans", "anticipates", "believes", "intends", "estimates", "projects", "potential", "scheduled" and similar expressions, or that events or conditions "will", "would", "may", "could" or "should" occur including, without limitation, timely completion of the ramp-up phase towards throughput design capacity of 55,000 tonnes per day, improvement of mine productivity, access to higher grade material, reduction of cost, positive outcome of any exploration work conducted around the Canadian Malartic infrastructure, at the Hammond Reef and Upper Beaver projects or at other Osisko's properties, and further development of its Hammond Reef project including timely completion of the project feasibility study.

Although Osisko believes the expectations expressed in such forward-looking statements are based on reasonable assumptions, including, without limitation, that all technical, economical and financial conditions will be met in order to achieve such events qualified by the foregoing cautionary note regarding forward looking statements, such statements are not guarantees of future performance and actual results may differ materially from those in forward looking statements. Factors that could cause the actual results to differ materially from those in forward-looking statements include gold prices, access to skilled consultants, mining development and construction personnel, results of exploration and development activities, Osisko's limited experience with production and mining operations, uninsured risks, regulatory framework and changes, defects in title, availability of personnel, materials and equipment, timeliness of government approvals, actual performance of facilities, equipment and processes relative to specifications and expectations, unanticipated environmental impacts on operations market prices, continued availability of capital and financing and general economic, market or business conditions. These factors are discussed in greater detail in Osisko's most recent Annual Information Form and in the most recent Management Discussion and Analysis filed on SEDAR, which also provide additional general assumptions in connection with these statements. Osisko cautions that the foregoing list of important factors is not exhaustive. Investors and others who base themselves on forward-looking statements should carefully consider the above factors as well as the uncertainties they represent and the risk they entail. Osisko believes that the expectations reflected in those forward-looking statements are reasonable, but no assurance can be given that these expectations will prove to be correct and such forward-looking statements included in this press release should not be unduly relied upon. These statements speak only as of the date of this press release.

Osisko Mining CorporationConsolidated Statements of IncomeFor the three months and the years ended December 31, 2012 and 2011----------------------------------------------------------------------------(tabular amounts expressed in thousands of Canadian dollars, except pershare amounts) Three months ended Years ended December December 31, 31, ------------------------------------------------ 2012 2011 2012 2011 ------------------------------------------------ ($) ($) ($) ($)Revenues 191,080 128,100 665,375 263,408Mine operating costs Production costs (101,239) (74,841) (353,827) (158,886) Royalties (2,546) (1,933) (8,924) (3,284) Depreciation (19,198) (11,800) (62,969) (21,786) ------------------------------------------------Earnings from mine operations 68,097 39,526 239,655 79,452 General and administrative expenses (8,411) (6,144) (29,361) (30,707) Exploration and corporate development expenses (3,345) (2,651) (11,450) (23,585) Other expenses - - - (485) ------------------------------------------------Earnings from operations 56,341 30,731 198,844 24,675 Interest income 402 354 1,547 2,318 Finance costs (8,006) (6,910) (30,831) (17,676) Foreign exchange gain (loss) (1,237) 1,669 1,923 (1,148) Share of earnings (loss) of associates (85) 20 (713) (460) Other gains (losses) (17,064) 1,962 (20,046) 3,288 ------------------------------------------------Earnings before income and mining taxes 30,351 27,826 150,724 10,997 Income and mining tax recovery (expense) (20,713) 9,976 (72,300) 7,000 ------------------------------------------------Net earnings 9,638 37,802 78,424 17,997 ------------------------------------------------ ------------------------------------------------Net earnings per share Basic 0.02 0.10 0.20 0.05 Diluted 0.02 0.10 0.20 0.05Weighted average number of common shares outstanding (in thousands) Basic 391,538 385,427 388,577 383,372 Diluted 392,719 389,994 390,874 389,933Osisko Mining CorporationConsolidated Statements of Cash FlowsFor the three months and the years ended December 31, 2012 and 2011----------------------------------------------------------------------------(tabular amounts expressed in thousands of Canadian dollars) Three months ended Years ended December December 31, 31, ------------------------------------------------ 2012 2011 2012 2011 ------------------------------------------------ ($) ($) ($) ($)Operating activitiesNet earnings 9,638 37,802 78,424 17,997Adjustments for: Interest income (402) (354) (1,547) (2,318) Share-based compensation 2,017 2,999 9,629 10,779 Depreciation 19,355 11,973 63,603 22,277 Finance costs 8,006 6,910 30,831 17,675 Write-off of property, plant and equipment - 175 617 16,451 Gain on disposal of property, plant and equipment 520 - 303 - Unrealized foreign exchange loss (gain) 1,106 (1,738) (2,363) 1,657 Share of loss (earnings) of associates 85 (20) 713 460 Net loss (gain) on sale of available-for-sale financial assets 5,034 - 4,432 (5,041) Net loss on financial assets at fair value through profit and loss 279 1,604 1,824 10,119 Impairment on available- for-sale financial assets 10,912 - 12,434 - Deferred gain - premium on flow-through shares - (3,567) - (7,849) Provisions and other liabilities 462 825 2,341 1,220 Income and mining tax expense (recovery) 20,713 (9,976) 72,300 (7,000) Other non-cash loss (gain) - - 152 (639) ------------------------------------------------ 77,725 46,633 273,693 75,788 Change in non-cash working capital items (20,710) (6,973) (26,911) 9,912 ------------------------------------------------Net cash flows from operating activities 57,015 39,660 246,782 85,700 ------------------------------------------------Investing activities Net decrease in short-term investments - - - 17,068 Net decrease (increase) in restricted cash (4,301) (20,629) 448 (18,985) Acquisition of investments (42,329) (1,500) (53,279) (13,783) Proceeds on disposal of investments - - 1,838 12,038 Property, plant and equipment, net of government credits (39,336) (59,533) (228,840) (356,787) Proceeds on disposal of property, plant and equipment 324 - 324 - Cash received from the acquisition of assets 40,513 - 40,513 - Interest received 366 356 1,393 2,525 ------------------------------------------------Net cash flows from investing activities (44,763) (81,306) (237,603) (357,924) ------------------------------------------------Financing activities Long-term debt 14,651 - 14,651 - Long-term debt transaction costs (146) (5) (262) (640) Long-term debt repayments (1,250) (1,250) (5,000) (3,333) Finance lease payments (6,088) (4,596) (22,790) (8,419) Issuance of common shares, net of expenses 1,199 701 19,095 39,477 Interest paid (5,649) (5,293) (22,314) (12,684) ------------------------------------------------Net cash flows from financing activities 2,717 (10,443) (16,620) 14,401 ------------------------------------------------Increase (decrease) in cash and cash equivalents 14,969 (52,089) (7,441) (257,823)Cash and cash equivalents - beginning of period 78,260 152,759 100,670 358,493 ------------------------------------------------Cash and cash equivalents - end of period 93,229 100,670 93,229 100,670 ------------------------------------------------ ------------------------------------------------ Interest paid, including interest expensed and capitalized 5,649 5,293 22,314 17,456Osisko Mining CorporationConsolidated Balance SheetsAs at December 31, 2012 and 2011----------------------------------------------------------------------------(tabular amounts expressed in thousands of Canadian dollars)



December 31, December 31, 2012 2011---------------------------------------------------------------------------- ($) ($)----------------------------------------------------------------------------ASSETS ------------------------------Current assets ------------------------------ Cash and cash equivalents 93,229 100,670---------------------------------------------------------------------------- Short-term investments 19,357 ----------------------------------------------------------------------------- Restricted cash 4,563 14,485---------------------------------------------------------------------------- Accounts receivable 32,266 39,419---------------------------------------------------------------------------- Note receivable 30,000 ----------------------------------------------------------------------------- Inventories 73,795 47,552---------------------------------------------------------------------------- Prepaid expenses and other assets 21,274 7,174---------------------------------------------------------------------------- 274,484 209,300----------------------------------------------------------------------------Non-current assets ------------------------------ Restricted cash 38,362 26,878---------------------------------------------------------------------------- Investments in associates 8,933 1,698---------------------------------------------------------------------------- Other investments 16,894 16,041---------------------------------------------------------------------------- Property, plant and equipment 2,329,773 1,801,325---------------------------------------------------------------------------- Deferred income and mining taxes - 14,000---------------------------------------------------------------------------- 2,668,446 2,069,242----------------------------------------------==============================Liabilities ------------------------------Current Liabilities ------------------------------ Accounts payable and accrued liabilities 100,931 74,562---------------------------------------------------------------------------- Current portion of long-term debt 76,883 86,485---------------------------------------------------------------------------- Provisions and other liabilities 1,405 824---------------------------------------------------------------------------- 179,219 161,871----------------------------------------------------------------------------Non-current liabilities ------------------------------ Long-term debt 260,529 245,139---------------------------------------------------------------------------- Provisions and other liabilities 18,618 6,038---------------------------------------------------------------------------- Deferred income and mining taxes 60,426 2,126---------------------------------------------------------------------------- 518,792 415,174----------------------------------------------------------------------------Equity attributable to Osisko Mining Corporation shareholders ------------------------------ Share capital 2,048,843 1,656,034---------------------------------------------------------------------------- Warrants 19,311 13,166---------------------------------------------------------------------------- Contributed surplus 65,868 55,909---------------------------------------------------------------------------- Equity component of convertible debenture 8,005 8,005---------------------------------------------------------------------------- Accumulated other comprehensive income (1,148) (9,397)---------------------------------------------------------------------------- Retained earnings (deficit) 8,775 (69,649)---------------------------------------------------------------------------- 2,149,654 1,654,068---------------------------------------------------------------------------- 2,668,446 2,069,242----------------------------------------------==============================----------------------------------------------------------------------------





Contacts:
John Burzynski
Vice-President Corporate Development
(416) 363-8653
www.osisko.com

Sylvie Prud'homme
Director of Investor Relations
(514) 735-7131
Toll Free: 1-888-674-7563



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