Since operations began in January 2010, it has had sales of $36 million, paid production expenses of $21 million and sold each ounce for between $945 and $1,152.
The company was granted mining rights on 18 November 2009 and will pay the state 4% of gross earnings over the 20 years it plans to operate.
Each ounce of gold Petaquilla extracts costs the company $600.
Environmental groups remain concerned at the speed in which permissions were granted.