Mr. Joseph de la Plante of Osisko Gold reports

EARLY WARNING RELEASE

Osisko Gold Royalties Ltd. has subscribed for and received from IDM Mining Ltd. 29.4 million common shares at a price of 17 cents per share and 41 million flow-through common shares at a price of 25 cents per share, in connection with the closing by IDM of its previously announced private placement. The private placement was announced on Feb. 22, 2017.

Immediately prior to the closing of the private placement, Osisko did not have beneficial ownership of, or control and direction over, any common shares of IDM. Immediately following the closing of the private placement, Osisko owns beneficial ownership of, or control and direction over, 70.4 million common shares of IDM, representing approximately 19.9 per cent of IDM's issued and outstanding common shares. Osisko does not own any other securities of IDM.

Osisko acquired the shares described in this press release for investment purposes and in accordance with applicable securities laws. Subject to a standstill clause agreed to between IDM and Osisko, which limits Osisko's ability to acquire additional shares of IDM, Osisko may, from time to time and at any time, with the consent of IDM and under other circumstances described in the standstill clause, acquire additional shares and/or other equity, debt, or other securities or instruments of IDM in the open market or otherwise, and reserves the right to dispose of any or all of its securities in the open market or otherwise at any time and from time to time, and to engage in similar transactions with respect to the securities, the whole depending on market conditions, the business and prospects of IDM and other relevant factors.

A copy of the early warning report to be filed by Osisko in connection with the private placement described above will be available on SEDAR under IDM's profile. This news release is issued under the early warning provisions of the Canadian securities legislation.

About Osisko Gold Royalties Ltd.

Osisko is an intermediate precious metal royalty company focused on the Americas that commenced activities in June, 2014. It holds over 50 royalties and streams, including a 5-per-cent net smelter returns royalty on the Canadian Malartic mine (Canada), a 2.0- to 3.5-per-cent NSR royalty on the Eleonore mine (Canada) and a silver stream on the Gibraltar mine (Canada). It maintains a strong financial position with cash resources of $499.2-million at Dec. 31, 2016, and has distributed $30.8-million in dividends to its shareholders during the past nine consecutive quarters. Osisko also owns a portfolio of publicly held resource companies, including a 14.9-per-cent interest in Osisko Mining Inc., 13.3 per cent in Falco Resources Ltd. and 16.9-per-cent interest in Barkerville Gold Mines Ltd.