TSX: G NYSE: GG (All Amounts in U.S. dollars unless stated otherwise) VANCOUVER, Jan. 14, 2014 /PRNewswire/ - GOLDCORP INC. (TSX: G) (NYSE: GG) today announced that it has commenced its formal offer (the "Offer") to acquire all of the outstanding common shares of Osisko Mining Corporation ("Osisko") (TSX: OSK) (Deutsche Boerse: EWX) by filing the Offer and Takeover Bid Circular and related documents (the "Circular") on Osisko's profile on www.sedar.com and with the Canadian securities regulators and furnishing the Circular to the United States Securities Exchange Commission. Under the terms of the offer, Osisko shareholders will receive 0.146 of a Goldcorp common share plus C$2.26 in cash for each Osisko common share tendered to the offer. Based on Goldcorp's TSX closing share price on January 10, 2014, the total consideration offered to Osisko shareholders is C$5.95 per Osisko common share representing a premium of 28% over Osisko's 20-day volume-weighted average share price as of January 10, 2014. Goldcorp has formally requested the Osisko securityholder list and intends to mail the Circular to Osisko's securityholders as soon as practicable following receipt of this information. The offer is open for acceptance until 5:00 p.m. ( Toronto time) on February 19, 2014, unless the offer is extended or withdrawn. Goldcorp encourages securityholders of Osisko to read the full details of the Offer set forth in the Circular which contains the full terms and conditions of the Offer and other important information as well as detailed instructions on how Osisko shareholders can tender their Osisko shares to the Offer. For assistance in depositing Osisko shares to the Offer, Osisko shareholders should contact the Depositary, CST Trust Company, who can be contacted at 1-800-387-0825 toll free in North America or at 416-682-3860 outside of North America or by e-mail at email@example.com; or the Information Agent, D.F. King, who can be contacted at 212-269-5550 for all banks and brokerage firms or at 1-800-290-6431 toll-free for all others or by email at firstname.lastname@example.org. The offer documents are available on www.sedar.com, www.sec.gov and Goldcorp's website at www.goldcorp.com. About Goldcorp Goldcorp is one of the world's fastest growing senior gold producers. Its low-cost gold production is located in safe jurisdictions in the Americas and remains 100% unhedged.