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Shares of Rio Tinto Plc. (NYSE ADR: RIO) were up nearly 3% in pre-market hours after Barron's reported this weekend that the stock could jump 20% over the next year. The article goes on to suggest that such a level is even possible without the company accepting a merger with rival Glencore International Plc. (OTCMKTS: GLNCY), which it initially rejected in July.