Dakota Fred died Tuesday, according to a statement from his family ... this only 4 months after he was diagnosed with stage 4 brain cancer. The fam says Dakota Fred fought his cancer battle "courageously" and died with loved ones by his side.

Dakota Fred's loved ones say they are remembering Dakota Fred as someone who "touched many lives and was loved and supported by many" ... while 'Gold Rush' says "his joy for life and adventure was contagious."

Dakota Fred got his start gold mining in North Dakota way back in the day, and that's how he ended up mining for gold in Alaska on 'Gold Rush.'

He appears in the show's first 4 seasons.

A fan favorite, Dakota Fred and his son, Dustin, returned to the franchise in 2018 with their own spinoff show, "Gold Rush: White Water," this time dredging for gold in whitewater collection pools at the base of Alaskan waterfalls.

Dakota Fred was 80.