Japan and Manchuria
According to this, Manchuria was a source of gold: http://globaljournals.org/GJHSS_Volume10/10-Japan-Looted-Gold-Resources-in-Northeast-China-during-World-War-II.pdf
also noted in the article was the statement that after the Borneo oil was cut off, the Japanese were extracting oil from Manchurian shale
that was 1945