Rio Silver's shares fell 16.7% to C$0.50 on heavy volume, with no reason given.

Rio Silver (CVE:RYO) shares dropped 16.7% to C$0.50 on Wednesday, with trading volume surging to 371,103 shares—744% above average—following a previous close of C$0.60. The Vancouver-based mining company, operating a gold project in Peru, has a market cap of C$8.48 million, a P/E ratio of 25.00, and a beta of 0.53. No specific reason for the decline was provided.