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Mn 35.4% Otjozondjupa NA

Category: FERROUS 
Product Code: AMIS 0104

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DOWNLOAD AMIS CERTIFICATE (PDF)
AMIS0104 Manganese ore, 35.31%, Namibia

Origin of material: Otjosondu manganese field is situated just north of the Okahandja Lineament some 150km north east of Windhoek. The Otjosondu manganese ore is associated with banded iron formation consisting of hematite-quartzite and iron-rich gneisses. The entire Otjosondu area has undergone Damaran metamorphism of at least upper amphibolite grade. The original paragenesis has been altered to a silica-rich metamorphic manganese mineral assemblage.  This ore was supplied by Otjozondu Mining.

 
 

Mineral and chemical composition: In pure manganese ores the critical assemblage braunite + haematite + jacobsite + rhodonite is frequently developed, whereas interlayered impure silicate ores bear various proportions of spessartine, Mn3+-bearing andradite–calderite and andradite garnets, rhodonite, manganoan aegirine–augite, aegirine, Ba–K–Na-feldspars, barite and rare kinoshitalite. Petrological constraints derived from country rock lithologies indicate peak metamorphic conditions of 660–700°C at estimated pressures of 3.5–4.5 kbar. Numerous Ba-rich pegmatitic veins restricted to the ore horizons testify to the production of partial melts from siliciclastic strata within the manganese formations.

 
 

Recommended Concentration and two “Between Laboratory” Standard Deviations

 

Certified Concentrations

 
 

Mn XRF

35.31

±

1.06

%

Mn M/ICP

35.49

±

2.08

%

Zn M/ICP

142

±

16

ppm

Ba M/ICP

2.86

±

0.23

%

Co M/ICP

240

±

21

ppm

SG

4.32

±

0.24

 

 
 

Provisional Concentrations

 
 

As M/ICP

116

±

14

ppm

Cu M/ICP

192

±

26

ppm

P M/ICP

192

±

46

ppm

Sr M/ICP

309

±

38

ppm

V M/ICP

108

 

ppm

 

 
 

Major Element Certified Concentrations

 
 

Al2O3

2.20

±

0.06

%

CaO

1.34

±

0.06

%

Fe2O3

20.78

±

0.38

%

K2O

0.26

±

0.02

%

SiO2

18.30

±

0.30

%

TiO2

0.27

±

0.02

%

 
 

Major Element Provisional Concentrations

 
 

MgO

0.35

±

0.06

%

LOI

3.28

±

0.70

%

 

Major Element Informational Values

 
 
 

Cr2O3

0.03

%

 

 

Na2O

0.10

%

 

 

S ICP

0.32

%

 

 

 

Please download the certificate for more information

 

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