1386 XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3
disseminated carbon present or exposed on the surface of
various grains. The TOF-SIMS analysis of as received TCM
for the feed sample did not show the presence of metallic
surface gold while elevated concentrations of surface gold
on carbonaceous matter from POX-CIL and CIL residue
samples were observed by TOF-SIMS. The results of gold-
robbed surface gold from the POX-CIL residue sample
established the presence of 0.27–1.43ppm Au in differ-
ent morphological varieties of TCM while 0.20–0.94ppm
Au in the CIL Residue. Gold-robbed surface gold was the
major gold carrier accounting for 70% of the gold in POX-
CIL Residue and 66% gold in the CIL Residue (Table 4c).
Metallurgy Implications
The mineralogy and gold deportment insights presented in
this paper for three ore types and various process streams
were instrumental in developing metallurgy diagnostics.
These studies highlighted the key sources of gold losses in
Plate 5. Photomicrographs of native gold grains (Au/red circle) from a Cu-Au refractory ore: liberated gold grains, b) attached
gold grains in chalcopyrite (Cp), and c) locked gold grains within hematite (Ht)
Plate 6. Photomicrographs of locked native gold grains (red circle/Au) from a triple refractory ore: a–b) locked in arsenopyrite
(Asp), c) and f) locked in silicates (Si), and d–e) locked in pyrite (Py)
disseminated carbon present or exposed on the surface of
various grains. The TOF-SIMS analysis of as received TCM
for the feed sample did not show the presence of metallic
surface gold while elevated concentrations of surface gold
on carbonaceous matter from POX-CIL and CIL residue
samples were observed by TOF-SIMS. The results of gold-
robbed surface gold from the POX-CIL residue sample
established the presence of 0.27–1.43ppm Au in differ-
ent morphological varieties of TCM while 0.20–0.94ppm
Au in the CIL Residue. Gold-robbed surface gold was the
major gold carrier accounting for 70% of the gold in POX-
CIL Residue and 66% gold in the CIL Residue (Table 4c).
Metallurgy Implications
The mineralogy and gold deportment insights presented in
this paper for three ore types and various process streams
were instrumental in developing metallurgy diagnostics.
These studies highlighted the key sources of gold losses in
Plate 5. Photomicrographs of native gold grains (Au/red circle) from a Cu-Au refractory ore: liberated gold grains, b) attached
gold grains in chalcopyrite (Cp), and c) locked gold grains within hematite (Ht)
Plate 6. Photomicrographs of locked native gold grains (red circle/Au) from a triple refractory ore: a–b) locked in arsenopyrite
(Asp), c) and f) locked in silicates (Si), and d–e) locked in pyrite (Py)