(Sharecast News) - Amerisur Resources chief executive John Wardle purchased 687,000 ordinary shares in the full-cycle oil and gas company.Wardle, who took over the role of CEO back in 2007, acquired the shares at an average price of 13.10p each, for a total value of £89,997.The CEO also picked up 8.12m ordinary shares on Monday, dropping 12.31p on each one for a total of £999,966.52.Just last week, Amerisur Resources entered into a farm-out agreement with Occidental Andina - an affiliate of international oil and gas exploration and production company Occidental Petroleum Corporation.The AIM-traded firm said the agreement was across the Putumayo-9, Terecay, Tacacho and Mecaya exploration blocks, all in the Putumayo region in southern Colombia.In consideration of the acquisition of a 50% interest in each block, Occidental Andina would fund a $93.25m exploration and appraisal program between 2019 and 2021.Occidental Andina would fund 85% of the total planned 2D seismic cost expenditure of $65m, and 100% of the $38m planned drilling programme.As of 1630 GMT, Amerisur shares were 3% higher at 13p.Top Director BuysAmerisur Resources (AMER)Director name: Wardle,JohnAmount purchased: 687,000 @ 13.10pValue: £89,997.00Jpj Group (JPJ)Director name: Goulden,Neil GAmount purchased: 10,000 @ 582.00pValue: £58,200.00Ten Lifestyle Group (TENG)Director name: Cheatle,Alex Amount purchased: 65,676 @ 30.00pValue: £19,702.80Top Director Sells