Genghis Khan was a Mongolian leader known for his ruthless and barbaric actions. He led his army of warriors to conquer most of Eurasia (Europe and Asia) and is most famous for almost forming a world empire. The Chinese actually built the Great Wall of China in an attempt to keep Khan and his Mongols out, it didn't work.
High density. It placer mining takes advantage of gold's high density, which causes it to sink more rapidly from moving water than the lighter siliceous materials with which it is found.
