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South Koreans were taken to major coal, magnesite, zinc and lead mines mostly in North and South Hamgyeong Provinces, according to the human rights group investigation.

That reaction would leave magnesium oxide powder, which when spread thin would rapidly react with CO2 from the atmosphere, re-forming magnesite, completing a cycle that could be repeated over and over.

The 95-year-old home has stayed in touch with its roots, showcasing oak floors, stained glass windows, beamed ceilings, arched French doors and a sweeping magnesite staircase across two stories.

They mined copper, gold, zinc, lead and magnesite.

Specifically, the researchers turned it into carbonate minerals such as calcite and magnesite.