By Rhodri Morgan According to a new report, after years of bumper dividends, investors will have to get used to lower cash returns from mining giants such as BHP, Rio Tinto, Anglo American, and Glencore. Analysis from Morningstar published today said that after “many years of returning excess cash to shareholders” at the expense of expanding portfolios through mergers and acquisitions, heightened prices are now forcing a strategic rethink. Geological deposits are finite and deplete; be it precious metals such as gold and silver, energy fuel such as coal or energy transition metals such as zinc…