Jason's determination to find gold and make it big in life.
Explanation:
The lines 50-57 talk about a young man called Machigan who made it big and became rich after he left his small farm to find gold in Alaska. In this way, Jason also directs his ambition towards the same path as Machigan. After all, the central idea of the passage is all about Jason's determination to find gold and make it big in life.
The details presented in the excerpt of the newspaper article in lines 36-39 reveal that Jason was determined about his point of view. He knew that working at a factory like his brothers was not for him. He was adventurous and was determined that he would find gold someday.
