Hong Kong stocks fell on Monday as tensions between the US and Iran showed no sign of easing quickly, keeping investors cautious about potential disruptions to global energy supplies and regional stability.The Hang Seng Index slipped 0.1 per cent to 25,436.27 at the market open, extending a 1 per cent loss recorded from Friday. The Hang Seng Tech Index gained 0.2 per cent. On the mainland, both the CSI 300 Index and the Shanghai Composite Index were little changed.Gold miner Zijin Mining...