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a.<br />

80-<br />

70g<br />

60-<br />

50gw<br />

40-<br />

O"<br />

30-<br />

•£20-<br />

LL<br />

10-<br />

50 100 150 200 250 300<br />

b.<br />

CD<br />

50-<br />

¥u_ 10-<br />

T(g/m3) ln{T(g/m3))<br />

Fig.7.5. Histogrammes des teneurs de columbo-tantalite mesurées (a) et de leur<br />

transformation logarithmique (b) dans la mine Étienne-Méguhé<br />

721172-<br />

765 762404 763042 763681<br />

UTME<br />

o-<br />

764319<br />

-<br />

Teneur (Kg/m3)<br />

Echelle :<br />

—<br />

0 640 m<br />

Fig.7.6. Contours des teneurs (T) en columbo-tantalite par l'inverse des distances sur la<br />

mine Étienne-Méguhé<br />

—<br />

237

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