LONDON (Reuters) - Commodities giant Glencore (>> Glencore PLC) has started talks with Rio Tinto's (>> Rio Tinto plc) (>> Rio Tinto Limited) largest shareholder, Aluminium Corp of China (Chinalco), as it seeks to pave the way for a possible merger in 2015, Bloomberg News reported on Monday.

Reuters reported last month that Glencore could make a move for mining rival Rio Tinto to gain exposure to iron ore, citing banking sources.

Bloomberg said in its report that Glencore had made a preliminary step towards securing the tie-up by holding discussions in recent weeks with Chinalco (>> Chinalco Mining Corp International), which owns a 12.91 percent stake in Rio Tinto, according to Reuters data.

Citing two people familiar with the situation, Bloomberg reported that Glencore had opened the talks to gauge Chinalco's interest in a potential deal.

Spokesmen for both Rio Tinto and Glencore said their companies do not comment on market speculation.

(Reporting by Sarah Young; Editing by David Goodman)