VANCOUVER, British Columbia, May 10, 2018 — Alio Gold Inc (TSX:ALO) (NYSE AMERICAN:ALO) (“Alio Gold” or the “Company”) today announced that Institutional Shareholder Services Inc. (“ISS”) and Glass, Lewis & Co., LLC (“Glass Lewis”),
two leading proxy advisory firms, have recommended that both Alio Gold and Rye Patch shareholders vote FOR the plan of arrangement (the “Transaction”) whereby Alio Gold will acquire all of the issued and outstanding shares of Rye Patch, at their
special meetings of shareholders to be held on May 18, 2018.