Who became the richest from the Gold Rush in 1850?

"Brannan" is the appropriate answer.

Explanation:

The wealthiest individual named "Brannan", the most powerful families throughout California were recognized throughout the centuries the 1850s as well as 1860s.The turmoil of something like the surge of riches was playing against his temperament as well as entrepreneurial sensibilities or skills, but perhaps a player cared for him.

Thus the above is the correct answer.