Proposed Genetic Model For The Precipitaton Of Uranium In ...

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TABLE 2.ROCK SAMPLES ANALYSES OF THE OXIDIZED ZONEUs08Ferrous# Chemical U+4 U+6IronOrganicIron asMoo3 VzOs~e'*/~e'~ Cas FeOFez03% % % % % % ppm ppm0.041 0.007 --- ND 163.68022 0.008 0.0081 --- 5.050 0.037 0.007 0.360 ND 56.990TABLE 3CORE SAMPLE ANALYSES OF TRANSITION AND REDUCING ZONETotal Iron as Iron as vanal n# FRO^ % FeO %%(on dry basis)
uplifting. This water table has controlled theaccumulatiop of uranium in the form of ahanging ore body. Hydrochemical characterof the ground water is given in Table 4. Thepresence of free oxygen made the uppersurface of water oxidized. With depth,oxygen become lesser and ultimately becamenon-existent thus the conditions becamereducing that made Eh negative. Theremobilized uranium, by reaching to redoxboundary, changed its valency from +6 to+4 and got stable because U +4 is alwaysstable in negative Eh conditions, andultimately re-deposited there. The uraniumore, formed at the end of secondarymobilization is so young in age that noradioactivity is associated with it; thisradioactive signature cannot be used forarithmetic assessment of the subsurfaceuranium ore body.CONCLUSIONSFig. 5. Gamma Log of Taunsa areadepicting three different levels ofuranium accumulations.----- - --------- -The present day water table wasestablished as a result of last episode ofThe chemical ore body is emplaced as a resultof trickling down of surface uraniummineralization available at expense of surfaceradiometry. The uranium accumulated belowthe ground water table, where Eh-pHconditions are favorable for precipitation.This ore body is formed at its present locationthrough leaching, remobilization andaccumulation at redox boundary. Gamma logof the ore body represent three levels ofuranium accumulation, shdws repeatedmobilization-precipitation phenomenon. Theuranium ore formed at the end of secondarymobilization is too young in age that noradioactivity is associated with it. Watersamples collected from different holes of orebody indicates that pH remains slightlyalkaline. The Eh versus pH conclude that theintersect lies in the area of slightly alkalinemedium. -During-anatysts of-core-samples it isobserved that uranium is easily leachable witheven fresh water and drilling mud.
Page 1: Geol. Bull. Univ. Peshawar, Vol. 37
Page 4 and 5: TABLE 1.ROCK SAMPLE ANALYSES COLLEC
Page 6 and 7: WSTAGE OF MULTCPHA- 3REFORMLlTlOH O
Page 10 and 11: TABLE 4.HYDROCHEMICAL CHARACTER OF

Proposed Genetic Model For The Precipitaton Of Uranium In ...

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