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6°W7°W8°W9°W10°W

26°N

25°N

24°N

23°N

ExplanationNord-east region sub-areas

Geologic formation contact

Samples with no matching chemistry# Rock (201 samples)

Rock samples - AntimonyNo Sb analysis (225 samples)

<0.03 ppm (<2.5th percentile)

0.04 - 0.05 ppm (2.5 - 10th percentile)

0.06 - 0.20 ppm (10 - 25th percentile)

0.21 - 1.25 ppm (25 - 75th percentile)

1.26 - 4.10 ppm (75 - 90th percentile)

4.11 - 6.45 ppm (90 - 95th percentile)

6.46 - 10.15 ppm (95 - 97.5th percentile)

10.16 - 20.00 ppm (97.5 - 99th percentile)

20.01 - 1,020.00 ppm (>99th percentile)

0.025 12000

20

40

10%

30%

50%

70%

90%

Samples:Minimum:Maximum:Mean:Geo.Mean:Median:Mode:Std.Dev.:Std.Err.:Skew:Kurtosis:Log:Mean:Median:Skew:

4030.0250

1020.00004.15400.48440.35000.2000

50.952.53819.67389.1

-0.3148-0.45590.5639

Sb

MAURITANIA

MAPAREA

APPROXIMATE MEANDECLINATION, 2007

MAG

NET

IC N

OR

THT

RU

E N

OR

TH

4 / °1 2

10 0 10 20 30 40 50 KILOMETERS

SCALE 1:500 00010 0 10 20 30 40 MILES

Transverse Mercator projection, WGS 84 DatumScale factor 0.9996; Longitude of central meridian 11° W.; latitude of origin 0°

This map was produced as part of the "Second Projet de Renforcement Institutionnel du Secteur Minier (PRISM II)"co-financed by the Government of Mauritania and the World Bank (Credit No. IDA-38100 MAU).

2012

By Stuart A. Giles and Robert G. Eppinger

U.S. Department of the InteriorU.S. Geological Survey

RÉPUBLIQUE ISLAMIQUE DE MAURITANIE

Geochemistry of Rocks in the Nord-East Area — AntimonyMinistère du Pétrole, de l’Energie et des Mines