Kalia Limited announced update for the geophysical survey underway in Bougainville. Optimum flying lines have been determined to be at 45 degree to latitude; Flying height set at 65metres above surface; Helicopter availability 100% to date; Close on quarter of area covered to date; Analysis shows data collected to be of high quality; Conditions have limited the flying window to morning hours; Electromagnetic atmospherics has negatively impacted conditions for survey time in flying window. The helicopter was mobilised to Bougainville at the end of August 2018. After testing flying conditions and calibrating equipment Thomson Aviation determined that the flying lines should be at 45 degree to latitude given the topography and at a height of 65 metres above ground. The quality of the data collected using these parameters has been analysed and assessed by Fathom Geophysics Australia Pty Ltd. to be of high quality. The flying window has been limited to mornings because of cloud and jungle mist that develops from mid-morning. Electromagnetic atmospherics has limited surveying activity during available flying windows because of the negative impact on quality of data. Notwithstanding these challenges a quarter of the area has been covered and good quality data collected.