What factors led to the overwhelmingly high mortality rate among the early jamestown colonists?

There are a few factors that prompted the high death rate of the Jamestown pilgrims however the accompanying rundown is a rearranged form: 
1. Desires of discovering gold - The desires of discovering gold (and mining it) prompted individuals dismissing things, for example, gathering sustenance, setting up shield, and so forth. 
2. Area - The area that the pioneers settled in at was extraordinary for guarding against maritime invasions however appalling for living conditions 
3. Absence of impetus - The absence of motivation among the homesteaders to finish essential undertakings prompted the assignments not completing.

He advocated for a separation of powers of the government and the ones enforcing the law.