http://www.minesight.com/Portals/0/in%20the%20news/1505%20Drones-UAVs.PDF

http://www.womp-int.com/story/2009vol06/story025.htm

http://www.barrick.com/files/responsibility/2014/2015-Barrick-Excellence-Awards.pdf

http://barrickbeyondborders.com/mining/2014/10/the-skys-the-limit/

http://www.maptek.com/pdf/i-site/case_studies/Maptek_I-Site_barrick_gold_casestudy.pdf

https://www.endole.co.uk/company/10099957/sean-jefferys-ltd

http://www.expouav.com/speaker/sean-jeffereys/