U.S. Silver (OTC:USSIF) urges shareholders to reject Hecla Mining's (NYSE:HL) hostile bid, calling it inadequate and highly opportunistic, and asks them to vote in favor of an earlier offer by RX Gold & Silver. Last week, HL made an all-cash offer of C$110.7M for U.S. Silver, a month after the Canadian company agreed to be bought by RX Gold.