
Numerically speaking, El Mutun's total estimated Reserves are approx 40 Billion tons containing about 20 Billion tons of Iron (50% iron). FYI, the World's total estimated ore reserves are about 800 Billion tons containing about 230 Billion tons of Iron (about 30% iron).
Lastly, while the world's largest iron ore deposit remains largely UNexplored, it should be noted that India's 3rd largest steel manufacturer, Jindal Steel and Power Limited, signed a $2 Billion Mutun production deal with Bolivia's government in July 2007. Per the link below, Jindal was granted rights for exploring and developing a 30 kilometer section of the deposit for 40 years.
in.reuters.com/article/companyNews/idINN1839136120070719
Data Courtesy: Wikipedia + Reuters