Rio Tinto and Glencore are reportedly in preliminary discussions regarding merging their businesses, according to Bloomberg News. The proposed merger has the potential to create a company valued at approximately $US158 billion, which would exceed BHP's valuation. Glencore currently produces 1 million tonnes of copper annually, compared to Rio Tinto's 800,000 tonnes, pointing towards a notable surge in global supply post-merger. Both companies have refrained from providing comments on the talks. Following the news, Glencore's stock surged by 7.4 percent, while Rio Tinto's shares experienced a 2.5 percent decline.