To establish if there is a correlation between Hg
levels and fish and gold mining in the area, GMP
researchers measured Hg levels in a fish from the
Toldano River, a part of the Tatelu region where there is
no mining activity. Low Hg levels were found in this site
(T6), in spite favorable conditions for methylation
created by a hydroelectric plant lake (Schetagne and
Verdon, 1999). Mercury levels in T6 were the lowest of
any site tested (0.002±0.01 N=6), and used as a
reference area.