Dana Quentin Coffield, Director at Amerisur Resources, holds 1.07M shares in Amerisur Resources (Ticker: GB:AMER), holds 2.03M shares in Gran Tierra Energy (Ticker: GTE). Most recently, Dana Quentin Coffield Bought ― shares of Amerisur Resources on Jan 03, 2019 for an estimated value of 84.39K.