Morro da Mina

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Morro da Mina.xlsx

Location - Brazil

Age (of protore) - 2070-1860 Ma

Original size - 4.5 million tonnes of Mn

References

Cabral, A.R., Zeh, A., Vianna, N.C., Ackerman, L., Pašava, J., Lehmann, B. and Chrastný, V., 2019. Molybdenum-isotope signals and cerium anomalies in palaeoproterozoic manganese ore survive high-grade metamorphism. Scientific reports, 9(1), p.4570.

Leverett, P., Williams, P.A., and Hibbs, D.E., 2008, Ca-Mg-Fe-rich rhodonite from the Morro da Mina Mine, Conselheiro Lafaiete: Mineralogical Record, v. 39, p. 125-130.

Herz, N., and Banerjee, S., 1973, Amphibolites of the Lafaiete, Minas Gerais, and the Serro do Navio manganese deposits, Brazil: Economic Geology, v. 68, p. 1289-1296.

Horen, A., 1953, The manganese mineralization at the Merid Mine, Minas Gerais, Brazil, Unpublished Ph.D. Thesis, Harvard University, 224 p.

major elements

Major Elements, oxide percent

 

 

 

%

%

%

%

%

%

%

%

%

%

%

MnO
Fe2O3t
SiO2
Al203
CaO
MgO
K2O
Na2O
TiO2
P205
LOI
Average of ore grade samples 43.1 5.29 24.6 5.63 3.46 4.12 bd bd 0.41 0.38 10.9
Source Sample number Lithology                      
Horen Piquiry-7   57.5 2.48 27.7 1.41 1.82 4.60 0.001 0.001 0.001 0.001 4.6
Horen Piquiry-6   44.4 3.21 24.7 5.21 4.85 4.70 0.001 0.001 0.001 0.63 9.3
Horen Merid-3   44.1 3.70 21.8 5.32 5.57 4.67 0.001 0.001 0.001 0.44 14.0
Horen Merid-2   43.8 5.83 18.0 4.47 2.64 3.81 0.001 0.001 0.8 0.001 16.2
Horen Merid-1   43.5 6.65 13.2 3.52 2.47 3.75 0.001 0.001 0.68 0.001 19.6
Cabral MM-10 Queluzite 42.6 3.57 15.8 5.41 5.93 4.19 0.001 0.001 0.24 0.13 21.8
Cabral MM-12 Queluzite 42.5 4.53 23.6 5.95 7.39 4.08 0.001 0.001 0.31 0.13 11.3
Cabral MM-9 Queluzite 42.4 3.92 16.9 7.04 6.33 3.18 0.001 0.001 0.33 0.13 19.4
Horen Merid-4 42.0 4.69 22.9 4.77 2.32 2.79 0.001 0.001 0.17 0.26 16.8
Cabral MM-14 Queluzite 39.3 3.31 35.6 5.31 5.00 5.25 0.001 0.001 0.23 0.19 5.5
Cabral MM-26 Queluzite 36.4 3.51 19.6 4.88 4.99 4.37 0.28 0.001 0.23 0.001 15.1
Cabral MM-11 Queluzite 35.5 5.37 28.0 8.04 7.05 3.91 0.001 0.001 0.41 0.13 11.3
Horen Piquiry-8 35.1 7.94 32.4 9.67 4.20 6.08 0.001 0.001 0.1 0.35 1.6
Horen Merid-5 34.7 7.83 35.9 10.7 3.80 2.53 0.001 0.001 0.14 0.38 5.1
Cabral MM-25 Queluzite 34.4 2.47 11.5 4.57 4.98 4.53 0.21 0.001 0.2 0.13 24.8
Cabral MM-27 Queluzite 32.9 3.97 30.0 7.29 5.57 3.15 0.03 0.03 0.33 0.13 7.4
Cabral MM-15 Queluzite 26.9 5.82 38.1 9.23 6.33 3.04 0.001 0.001 0.47 0.10 9.8
Sub-ore grade
Cabral MM-16 Queluzite 18.8 7.27 44.0 12.7 4.44 2.22 0.001 0.001 0.65 0.16 9.4
Cabral MM-22 Mn-rich graphitic schist 15.5 4.13 54.0 8.99 2.99 2.54 0.02 0.02 0.81 0.32 10.4
Cabral MM-23c Mn-rich graphitic schist 5.19 6.56 48.6 12.3 2.76 3.26 3.79 1.51 0.64 0.25 14.3
Cabral MM-24b Mn-rich graphitic schist 4.62 7.28 51.0 11.3 4.27 5.17 1.92 1.62 0.67 0.43 11.2
Cabral MM-24a Mn-rich graphitic schist 2.67 6.91 51.4 13.0 3.12 4.44 2.61 2.48 0.8 0.41 11.6
Cabral MM-23a Graphitic schist 0.93 6.63 54.2 11.5 1.94 3.29 3.09 3.22 0.63 0.23 13.8
Cabral MM-21 Graphitic schist 0.92 6.19 53.3 12.1 0.74 1.82 4.04 3.64 0.53 0.09 15.8
Cabral MM-23b Graphitic schist 0.67 6.1 52.6 12.4 2.36 3.32 2.38 4.09 0.73 0.31 14.6
Cabral MM-20 Graphitic schist 0.15 8.93 49.5 10.9 2.36 3.14 1.55 3.70 0.89 0.25 18.3
Cabral MM-28 Graphitic schist 0.13 9.19 54.7 14.8 3.40 5.21 1.87 1.91 1.06 0.24 7.0

value in italics = below detection, set at 10% of detection level

Trace elements, ppm

 

 

ppm

ppm

ppm

ppm

ppm

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ppm

 

As
Ba
Cd
Co
Cr
Cu
Mo
Nb
Ni
Pb
Rb
Sc
Sr
Th
U
V
Y
Zn
Zr
Average ore grade
28 159 10 316 0 190 90 5 939 20 2 9 77 2 1 342 12 86 51
Piquiry-7
Piquiry-6
Merid-3
Merid-2
Merid-1
MM-10 16 3 17.9 313 313 271 84 4.2 1009 1.8 0.01 7 51 1.9 0.7 307 8.9 81 39
MM-12 5.8 10 12.1 267 267 34 92 5.00 900 3.1 0.2 9 81 2 0.9 345 11 94 50
MM-9 5.1 6 12.5 308 308 366 67 5.20 1188 4.3 0.01 9 57 3 1.2 350 12 56 56
Merid-4
MM-14 81 6 10.1 416 416 22 185 4.00 751 4.9 0.2 7 88 1.9 0.6 381 9.1 43 36
MM-26 29 624 18.3 348 348 62 175 4.7 1055 85 9.8 7 73 0.7 0.3 366 10 145 35
MM-11 10 6 0.9 329 329 285 29 5.7 1196 3.1 0.3 12 102 2.4 0.7 301 15 93 70
Piquiry-8
Merid-5
MM-25 83 723 15.6 406 406 322 83 3.5 877 16 10 6 85 1.9 0.7 441 8.4 69 32
MM-27 26 51 1.2 323 323 23 74 6.1 1219 45 0.7 10 124 3 1.3 399 14 104 63
MM-15 0.5 2.0 5.7 132 132 327 21 5.7 260 18 0.3 14 36 3.8 2.1 192 23 91 79
Sub-ore grade      
MM-16 0.05 17 0.7 273 273 606 23 7.7 535 28 0.01 22 9.9 6.1 3.4 259 43 18 137
MM-22 0.05 39 0.2 135 135 22 11 16 883 11 1.7 18 49 11 7.6 175 32 13 117
MM-23c 0.05 4293 1.7 86 86 388 35 6.5 608 25 126 18 374 4.4 3 199 32 121 92
MM-24b 0.05 1346 2.8 121 121 306 11 5.5 575 29 88 19 121 3.8 2.4 233 31 155 96
MM-24a 0.05 1857 2.5 118 118 321 13 7.3 549 22 112 21 159 5.1 3.3 202 32 143 118
MM-23a 0.05 1764 2.4 75 75 402 9.2 5.8 384 28 106 16 225 4.8 3.1 168 26 115 93
MM-21 0.05 4645 1.8 118 118 520 15 6.1 316 14 104 16 456 5.5 3.6 153 33 76 103
MM-23b 0.05 1061 1.2 73 73 376 5.2 5.9 416 25 90.8 17 178 4.6 3.4 139 29 78 103
MM-20 0.05 416 0.3 95 95 355 14 10 233 6.5 67 21 315 5.8 2.4 223 25 86 143
MM-28 1.2 1380 1.8 39 39 158 1.8 6.7 461 438 62.3 27 294 2.9 1.2 164 23 449 125

blank or nr = not reported; value in italics = below detection, set at 10% of detection level

Rare-earth elements, ppm

 

 
La
Ce
Pr
Nd
Sm
Eu
Gd
Tb
Dy 
Ho 
Er 
Tm 
Yb
Lu
Average ore grade
13.73 38.20 3.44 14.06 2.89 0.77 2.92 0.44 2.86 0.60 1.76 0.25 1.62 0.25
Sample #                            
Piquiry-7
Piquiry-6
Merid-3
Merid-2
Merid-1
MM-10 8.9 28.3 2.10 8.3 1.63 0.470 1.73 0.25 1.42 0.29 0.85 0.12 0.81 0.13
MM-12 11.6 38.6 2.68 11.8 2.12 0.480 2.16 0.33 2.08 0.48 1.18 0.17 1.07 0.18
MM-9 14.5 41.4 2.92 12.2 2.36 0.660 2.46 0.35 2.39 0.49 1.33 0.19 1.27 0.17
Merid-4
MM-14 9.4 28.2 2.09 7.8 1.72 0.570 1.74 0.25 1.57 0.30 0.89 0.12 0.75 0.11
MM-26 6.2 14.6 1.17 4.8 1.30 0.380 1.97 0.3 1.78 0.36 0.98 0.14 0.97 0.13
MM-11 11.5 36.2 2.67 11.2 2.40 0.700 2.6 0.38 2.5 0.52 1.52 0.20 1.34 0.22
Piquiry-8
Merid-5
MM-25 14.3 40.7 2.61 9.6 1.76 0.590 1.86 0.25 1.75 0.32 0.76 0.12 0.82 0.11
MM-27 11.3 32.7 2.71 10.5 2.76 0.720 2.51 0.4 2.37 0.5 1.44 0.22 1.31 0.2
MM-15 18.0 47.9 4.67 17.9 3.59 1.140 3.7 0.59 3.72 0.8 2.19 0.32 2.06 0.32

Sub-ore grade

MM-16 35.8 72.4 8.06 31.3 6.40 1.420 7.15 1.11 7.11 1.44 4.42 0.58 3.77 0.61
MM-22 9.5 39.2 6.16 29.3 5.76 1.350 4.22 0.65 4.82 1.15 3.84 0.55 3.68 0.59
MM-23c 22.7 42.4 5.17 21.4 4.51 1.260 5.07 0.84 5.1 1.01 3.13 0.42 2.8 0.43
MM-24b 21.9 42.5 5.03 21.7 4.50 1.310 5.22 0.81 5.16 1.02 3.22 0.45 2.75 0.43
MM-24a 27.3 51.9 6.43 26.5 5.23 1.340 5.83 0.84 5.09 1.1 3.15 0.46 2.94 0.46
MM-23a 19.6 39.6 5.05 20.5 4.45 1.090 4.46 0.67 4.21 0.87 2.68 0.34 2.4 0.36
MM-21 26.0 46.1 6.11 23.9 5.03 0.940 5.23 0.76 5.03 1.1 3.3 0.48 3.1 0.48
MM-23b 21.6 40.8 5.36 21.4 4.29 1.190 4.5 0.71 4.72 1.04 3.04 0.4 2.72 0.42
MM-20 31.3 60.6 7.56 30.0 5.90 0.880 5.56 0.77 4.53 0.89 2.55 0.33 2.08 0.32
MM-28 17.0 35.5 4.46 17.4 3.70 1.290 4.25 0.65 3.93 0.86 2.43 0.32 2.2 0.32

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
Avg ore 32.001 35.830 19.157 14.705 9.447 7.292 7.527 5.939 4.659 1.458 0.862 7.175 1.67 0.86  
Piquiry-7      
Piquiry-6      
Merid-3      
Merid-2      
Merid-1      
MM-10 24.25 29.57 15.33 11.67 7.06 5.40 5.65 4.31 3.27 1.534 0.855 7.425      
MM-12 31.61 40.33 19.56 16.60 9.18 5.52 7.06 5.69 4.31 1.622 0.685 7.326      
MM-9 39.51 43.26 21.31 17.16 10.22 7.59 8.04 6.03 5.12 1.491 0.837 7.715      
Merid-4      
MM-14 25.61 29.47 15.26 10.97 7.45 6.55 5.69 4.31 3.02 1.491 1.007 8.469      
MM-26 16.89 15.26 8.54 6.75 5.63 4.37 6.44 5.17 3.91 1.270 0.726 4.319      
MM-11 31.34 37.83 19.49 15.75 10.39 8.05 8.50 6.55 5.40 1.531 0.856 5.799      
Piquiry-8      
Merid-5      
MM-25 38.96 42.53 19.05 13.50 7.62 6.78 6.08 4.31 3.31 1.561 0.997 11.784      
MM-27 30.79 34.17 19.78 14.77 11.95 8.28 8.20 6.90 5.28 1.385 0.836 5.829      
MM-15 49.05 50.05 34.09 25.18 15.54 13.10 12.09 10.17 8.31 1.224 0.956 5.905      
Sub-ore grade      
MM-16 97.55 75.65 58.83 44.02 27.71 16.32 23.37 19.14 15.20 0.999 0.641 6.417      
MM-22 25.89 40.96 44.96 41.21 24.94 15.52 13.79 11.21 14.84 1.201 0.837 1.744      
MM-23c 61.85 44.31 37.74 30.10 19.52 14.48 16.57 14.48 11.29 0.917 0.805 5.478      
MM-24b 59.67 44.41 36.72 30.52 19.48 15.06 17.06 13.97 11.09 0.949 0.826 5.381      
MM-24a 74.39 54.23 46.93 37.27 22.64 15.40 19.05 14.48 11.85 0.918 0.742 6.275      
MM-23a 53.41 41.38 36.86 28.83 19.26 12.53 14.58 11.55 9.68 0.933 0.748 5.519      
MM-21 70.84 48.17 44.60 33.61 21.77 10.80 17.09 13.10 12.50 0.857 0.560 5.668      
MM-23b 58.86 42.63 39.12 30.10 18.57 13.68 14.71 12.24 10.97 0.888 0.828 5.366      
MM-20 85.29 63.32 55.18 42.19 25.54 10.11 18.17 13.28 8.39 0.923 0.470 10.169      
MM-28 46.32 37.10 32.55 24.47 16.02 14.83 13.89 11.21 8.87 0.955 0.994 5.222      
                               

Isotopes

Sample
TC % TOC % Ccarb % δ13Corg pdb δ13Ccarb pdb δ18O smow Stotal % δ34S sulfide 87Sr/86Sr δ98Mo
Avg ore   4.0 42 -17.2 -11.0   0.62    
-1.1
Piquiry-7        
Piquiry-6        
Merid-3        
Merid-2        
Merid-1        
MM-10   3.6 6.7 -14.5 -10   0.33     -0.86
MM-12   5.0 3.8 -17.5 -10.8   1.4     -0.92
MM-9   3.3 6.2 -14.8 -9   0.78     -1.03
Merid-4    
MM-14   1.5 2.0 -16.9 -11.9   0.25     -0.59
MM-26   3.2 5.0 0.39     -1.29
MM-11   5.5 3.1 -18.8 -14.1   0.28     -1.8
Piquiry-8    
Merid-5    
MM-25   2.7 8.0 0.38     -1.55
MM-27   3.1 2.2 0.19     -0.74
MM-15   8.0 1.0 -20.4 -10.2   1.58     -0.69
MM-16   6.4 0.8 -20.8 3.05     -0.47
MM-22   8.2 2.0 0.7     -0.93
MM-23c   12.0 1.8 1.78     -0.44
MM-24b   8.2 1.4 2.16     -1.14
MM-24a   8.8 1.3 2.22    
MM-23a   9.8 1.4 2.93     0.07
MM-21   14.1 0.7 -20.8 2.5     0.05
MM-23b   11.0 1.9 2.35     0.31
MM-20   15.6 1.2 -22.5 3.47     0.8
MM-28   3.4 0.5 3.34     -0.17