鉱体および周辺軟岩盤中の透水に関する原位置試験
インプレース・リーチングのための基礎研究 (第2報)
1980 年 96 巻 1108 号 p. 373-378
詳細
1980 年 96 巻 1108 号 p. 373-378
In-situ measurements of the permeability in such soft rock ground as an uranium ore vein of soft congromerate and its footwall of weathering granite at the Ningyo-toge Uranium Mine were carried out.
The permeability coefficient of the weathering granite ground was determined by an in-situ pumping test and the obtained value was 4×10-4-5×10-6cm/sec, and it is in satisfactory agreement with the laboratory test results reported previously.
The in-place leaching tests to withdraw the pregnant solution by the suction pump were performed under some several conditions in a zone (8m×15m×3.5m) of the ore vein.
The results show that the withdrawing rate of pregnant solution is closely related to the viscocity of the solution, the suction pressure and the distribution of suction holes, and that most of the correlations among them can be explained by the concept of the effective withdrawal radius deduced by the laboratory tests.
