1598 XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3
compared to sphalerite in the high-Mn PEO_Po samples
(d50=1075 µm). Sphalerite is mainly associated with quartz
and pyrite. Galena is coarse-grained and mainly associ-
ated with pyrite (d50 is undetermined due to low galena
proportion).
Table 2 shows the feed assay data for the two ores. As
expected, the Mn content in the high-Mn ore is higher
(2.7 wt.%) compared to the low-Mn ore (0.5 wt.%). The
Zn grades are highest in the high-Mn ore (15.5 wt.%),
compared to the low-Mn ore (6.3 wt.% in the low-Mn
ore). The Pb grade in the low-Mn ore is 1.2 wt.%, whereas
it is ≤0.5 wt.% in high-Mn. The Ag grade, presented in g/t,
in the low-Mn ore is 5.12 g/t, and that of the high-Mn ore
is 1.41 g/t. Since both Ag and Pb grades are highest in the
low-Mn ore, this may indicate a relationship between Ag
and Pb. The SEM-WDS data indicated that the Mn con-
tent of sphalerite is higher in the high-Mn ore compared to
the low-Mn ore. Sphalerite also contains some Cd and Bi in
High-Mn Low-Mn
0
10
20
30
40
50
60
70
80
90
100
Others
Sulphates
Phosphates
Fe-Mn-Ti oxides
Znoxides
Garnet
Fe-Mg-Mnsilicates
Mica
Feldspar
Quartz
Other sulphides
Galena
Pyrite
Pyrrhotite
Sphalerite
Figure 1. Bulk mineral grades within the high-Mn and low-Mn East Pit samples. The Fe-Mg-Mn group includes silicates such
as grunerite and pyroxmangite and the Fe-Mn-Ti group includes oxides such as magnetite and rutile
A B
Figure 2. QEMSCAN false colour images of large 70 mm sections representing the mineralogy and texture of a) high-Mn_
PEO_Po, which contributed 70% to the high-Mn ore, and b) low-Mn ore
Mineral
(wt.%)
compared to sphalerite in the high-Mn PEO_Po samples
(d50=1075 µm). Sphalerite is mainly associated with quartz
and pyrite. Galena is coarse-grained and mainly associ-
ated with pyrite (d50 is undetermined due to low galena
proportion).
Table 2 shows the feed assay data for the two ores. As
expected, the Mn content in the high-Mn ore is higher
(2.7 wt.%) compared to the low-Mn ore (0.5 wt.%). The
Zn grades are highest in the high-Mn ore (15.5 wt.%),
compared to the low-Mn ore (6.3 wt.% in the low-Mn
ore). The Pb grade in the low-Mn ore is 1.2 wt.%, whereas
it is ≤0.5 wt.% in high-Mn. The Ag grade, presented in g/t,
in the low-Mn ore is 5.12 g/t, and that of the high-Mn ore
is 1.41 g/t. Since both Ag and Pb grades are highest in the
low-Mn ore, this may indicate a relationship between Ag
and Pb. The SEM-WDS data indicated that the Mn con-
tent of sphalerite is higher in the high-Mn ore compared to
the low-Mn ore. Sphalerite also contains some Cd and Bi in
High-Mn Low-Mn
0
10
20
30
40
50
60
70
80
90
100
Others
Sulphates
Phosphates
Fe-Mn-Ti oxides
Znoxides
Garnet
Fe-Mg-Mnsilicates
Mica
Feldspar
Quartz
Other sulphides
Galena
Pyrite
Pyrrhotite
Sphalerite
Figure 1. Bulk mineral grades within the high-Mn and low-Mn East Pit samples. The Fe-Mg-Mn group includes silicates such
as grunerite and pyroxmangite and the Fe-Mn-Ti group includes oxides such as magnetite and rutile
A B
Figure 2. QEMSCAN false colour images of large 70 mm sections representing the mineralogy and texture of a) high-Mn_
PEO_Po, which contributed 70% to the high-Mn ore, and b) low-Mn ore
Mineral
(wt.%)