Gold mining company AngloGold Ashanti announced on Monday that it had more than trebled free cash flow generation in the first half of the year to $108-million and lowered net debt by almost a third, as costs fell and it took advantage of a higher gold price. In its presentation of results for the six months to June 30, the company reported half-year gold production of 1.745-million ounces as being in line with the full-year guidance range of 3.6-million ounces to 3.8-million ounces.