ALUMINA LTD. (AWC $18.29, rated Underweight); RIO TINTO VISIT REVEALS COST PRESSURES SQUEEZING ALUMINA MARGINS IN A PERIOD WHEN CAPEX ESTIMATES ARE RISING AND ANOTHER $650MM IN CAPITAL IS NEEDED; RECENT $350MM CONVERTIBLE DEBT ISSUE INEXPENSIVELY SOLVED JUST ONE-THIRD OF THE PROBLEM June 26, 2008