The global mining landscape is bracing for a seismic shift after Rio Tinto and Glencore confirmed they are in talks regarding a potential merger. A tie-up between the two FTSE 100 titans would create the world’s largest mining entity, boasting a combined enterprise value of approximately £190bn. Glencore shares rallied nine per cent in early trading to 449.20 but Rio Tinto took a six per cent tumble to 143.06p. The move comes amid a race to beef up critical metals, particularly copper, as the industry’s pivot toward an energy…