All miners working in the Salar belong to Colchani 's cooperative .
Salar de Uyuni is estimated to contain 10 billion tonnes ( 9.8 billion long tons ; 11 billion short tons ) of salt , of which less than 25,000 t is extracted annually .
All miners working in the Salar de Uyuni belong to Colchani 's cooperative .
Salar de Uyuni is estimated to contain 10 billion tonnes ( 9.8 billion long tons ; 11 billion short tons ) of salt , of which less than 25,000 t is extracted annually .