Mining company Rio Tinto has announced its financial results for the six months ending June 30, 2009. Revenues dropped by 68 percent to $184 million, which the company attributed to the economic slowdown. downturn. The company believes that the slackened global liquidity has resulted in lowered inventory levels in the diamond pipeline. %% Its diamond unit reported $56 million worth of net loss, while in the same period last year it earned $108 million as net profit. Its overall diamond production dipped 14 percent to 6.787 million carats. It operates three mines with different stakes - Argyle mine (100 percent), Diavik mine (60 percent) and Murowa mine (77.8 percent ). %% Capital expenditure on its diamond assets dipped 57 percent to $157 million, and assets valued $1.55 billion. Its diamond assets valued $1.34 billion at the start of the period. %% The full group net earnings decreased 65 percent to $2.5 billion and revenues by 35 percent to $19.5 billion.