MONTREAL, QUEBEC and TORONTO, ONTARIO — (Marketwire) — 12/21/12 — Osisko Mining Corporation ("Osisko") (TSX: OSK)(FRANKFURT: EWX) and Queenston Mining Inc. ("Queenston") (TSX: QMI)(FRANKFURT: QMI)(OTCQX: QNMNF) are pleased to announce that the Ontario Superior Court of Justice (Commercial List) has approved the previously announced plan of arrangement (the "Arrangement") involving Queenston and Osisko whereby, among other things, Osisko has agreed to acquire al