San Juan Extension and profitability

The repeal of the Sherman Silver Purchase Act obviously was a serious blow to the narrow gauge San Juan Extension.

The Great Depression was the Great Depression.

WW II was an uptick for obvious reasons.

Was the 50's oil and gas boom profitable or a break even operation?

What would it have taken for the branch to have turned a profit during the other time frames? Or was it just a lost cause.

I have never read much about the profitability of the narrow gauge other than it was a losing proposition.

Any information that could be shared would be interesting, even if it is nothing more than pointing an interested party in the right direction.