From: Effects of columbite/tantalite (COLTAN) mining activities on water quality in Edege-Mbeki mining district of Nasarawa state, North Central Nigeria
Location/site
Source
Enrichment factor (EF)
Ni
Mn
Pb
Cd
Edege-Mbeki
Well
0.477
0.259
38.62
11.52
Mining ponds
0.729
0.035
5.12
1.19
Mararaban-Edege (control)
2.63
0.39
20.07
21.38