The chief executive of Africa's top gold producer AngloGold Ashanti said on Thursday that he estimated the company lost about 45,000 ounces in output to the recent strike at its South African operations.

Mark Cutifani, addressing a presentation after the company recorded a 68 percent surge in its second-quarter earnings, said the estimate took into account four days of lost time, the tapering off of work ahead of the strike as well as the gradual reboot of operations to make sure production was ramped back up safely.

The strike of about 100,000 gold mine workers against AngloGold and its rivals Gold Fields and Harmony over wages started last Thursday and ended Tuesday evening. (Reporting by Ed Stoddard)