The firm claims to produce sustainable building materials from waste . Mineral gypsum extracted from polluted soil ; mixed with water to make cement . I feel free with my family , '' enthused Maria Mhlongo , whose husband works at one of AngloAmerican 's coal mines in eMalahleni . Over 100 houses built so far , each one saving estimated 100 tons of CO2 , says firm .
The firm claims to produce sustainable building materials from waste . Mineral gypsum extracted from polluted soil ; mixed with water to make cement . Over 100 houses built so far , each one saving estimated 100 tons of CO2 , says firm .