Conta Historia

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Location - Brazil, Minas Gerais; -20.22417, -43.52222

 
Download excel version
 
 

Age (of protore) - 2580-2400 Ma

Original size - 0.48 million tonnes of Mn

References

Cabral, A. R., Lehman, B., Sattler, C.D., Pires, F.R.M., and Kaneko, K., 2002,Hg–Tl-bearing manganese oxide from Conta História manganese deposit, Quadrilátero Ferrifero, Minas Gerais, Brazil: Trans. Instn Min. Metall.(Sect. B: Appl. earth sci.), 111, p. B123-B127.

Also Proc. Australas. Inst. Min. Metall., 307, May–August 2002.

major elements - trace elements - rare-earth elements - REE normalized - isotopes

Major Elements, oxide percent

 

Sample location

 
Sample no.

%

%

%

%

%

%

%

%

%

%

%
MnO
Fe2O3t
SiO2
Al203
CaO
MgO
K2O
Na2O
TiO2
P205
LOI

Average

 
Oxide ore
 62.7 21.0 0.59 1.91 0.09 0.08 0.74 0.15 0.05 0.16 11.7
9 compact ore 76.2 6.33 0.40 0.84 0.08 0.08 1.60 0.15 0.01 0.19 12.3
3 banded ore 68.1 13.8 0.81 1.67 0.16 0.11 1.00 0.60 0.04 0.16 11.9
5 banded ore 66.3 20.5 0.37 0.80 0.10 <0.01 0.20 0.05 0.01 0.12 11.5
2 banded ore 66.1 13.6 0.95 2.56 0.11 0.38 1.35 0.14 0.18 0.13 14.2
8 compact ore 63.3 15.0 0.67 4.91 0.06 0.06 1.14 0.15 0.09 0.20 14.3
1 concretionary 62.2 21.9 0.53 1.66 0.15 <0.01 0.19 0.07 0.02 0.19 12.3
7 banded ore 58.1 28.9 0.58 1.14 0.08 <0.01 0.17 0.07 0.05 0.09 10.6
6 banded ore 57.0 27.6 0.44 2.94 0.05 <0.01 0.35 0.08 0.02 0.08 11.4
4 banded ore 47.2 41.6 0.58 0.68 0.04 0.08 0.66 0.02 0.04 0.24 7.0
10 friable itabirite 0.39 89.9 0.65 0.60 0.02 0.03 0.01 <0.01 0.03 0.53 7.7
11 tuffacecous 0.31 17.6 36.0 32.2 0.01 <0.01 0.02 <0.01 0.23 0.11 13.3

 

Trace elements, ppm

 

 

ppm

ppm

ppm

ppm

ppm

ppm

ppm

ppm

ppm

ppm

ppm

ppm

ppm

ppm

ppm

ppm

ppm

ppm

ppm

 
As
Ba
Cd
Co
Cr
Cu
Mo
Nb
Ni
Pb
Rb
Sc
Sr
Th
U
V
Y
Zn
Zr
Avg oxide 7.0 3028 0.82 14.8 12.2 19.9 6.9 11.8 1067 0.5 1.1 3.2 10.9  
9 9 12273 0.5 12.8 <5 51.3 6.4 5.1    
12.0
3.54
39
  
133
  
3 7 389 2.4 15 7 17 <1 49    
186
2.2
14
  
41.7
  
5 7 294 <0.1 7.1 5 7.8 2.3 2.4    
166
4.6
38
  
64.9
  
2 7 2278 0.9 29 37 33.8 30.2 7.2    
213
3.6
23
  
56.4
  
8 13 2691 0.4 18.3 25 31.1 13.8 12.8    
59
4.7
13
  
80.9
  
1 9 5623 0.2 25.4 7 19.9 4.4 3.1    
167
5.6
21
  
65.6
  
7 4 1185 0.2 7.6 11 9 2.6 2.6    
8.63
3.6
42
  
205
  
6 3 1844 0.3 10.6 7 8.9 1.8 1.1    
7.88
3.9
46
  
85.7
  
4 4 676 2.4 7 8 <1 <1 23    
7.61
2.9
28
  
249
  
10 na 16 na 35 4 34 <3 135    
10.5
1.9
19
  
62.2
  
11 na 24 na <3 41 <10 11 <4    
10.2
4.4
45
  
63.5
  

blank or na or nr = not reported; bd = below detection

Rare-earth elements, ppm

 
Sample
La
Ce
Pr
Nd
Sm
Eu
Gd
Tb
Dy 
Ho 
Er 
Tm 
Yb
Lu
                             
                             
                             
 
                             
 
                             
 
                             
                             
                             
                             
   
                             
                             

Rare-earth elements,

normalized to chondritic values of Taylor & McLennan (1992)
Sample
LaN
CeN
PrN
NdN
SmN
EuN
GdN
TbN
YbN
Ce/Ce*
Eu/Eu*
LaN/YbN
                               
                               
                         
 
                         
 
                         
 
                         
                         
                         
                         
                 
                         
                         

Isotopes
Sample
 %S ore δ34S ore, sulfide %S host δ34S host, sulfide δ13C pdb δ18O pdb δ18O smow MnO % Ccarb % mineralogy