Thank you tester 1887, the additional information found in those records clarifies a great deal! The story now hangs together cohesively.
Nothing yet tells us where Regnar was from 1927-1929, but unless the family knows differently, it is a good guess he went to his father in California when he first arrived in the USA (or soon after), since he is living with him in 1929. I wonder if he underwent some kind of training or apprenticeship during this period.
I can believe the 1937 return trip from Nicaragua had to do with mining work. Current British Columbia companies own mines in Nicaragua (La Limon and La Libertad, for example). In 1940, as you showed, Regnar was working at the Nickel Plate Mine at Hedley, British Columbia, Canada, which was owned by Kelowna Exploration Company. Given the trip to Nicaragua, and given his employer, Regnar probably did NOT work at picking ore out of a mine (as we think of a miner). The record of his death calls him a carpenter; the ship manifest calls him a mining engineer.
Archives of Kelowna Exploration Company related to Nickel Plate Mine LINK:http://memorybc.ca/kelowna-exploration-company-nickel-plate-...
The Mascot Gold Mine seems to be located within the Nickel Plate Mine - at Nickel Plate mountain. Lots is available online about life there.http://www.mascotmine.com/mascot/mining.html
Again thanks for filling out the information in those records for us.
I realize the poster would like obits from the family and hope someone will find that.