Hydrogeological condition and water inflow estimation of zone 21 uranium deposit in Julong'an of Xiangshan

Julong'an rhombus block is an important uranium resources base and the zone 21 is located in west of the block, and its hydrogeology is of simple-middle type compared to the more complicated other ares. Narrow tunnel method and hydrogeologic analogy method was used for mine water inflow estimation, the drilling unit water inflow is lower than 0.1 L·s^-1·m^-1, and the prediction of mine water inflow is less than 29 m³·h^-1, the main aquifer water of the deposit (structure fissure aquifer) is of weak and uneven capability, and conduction performance is not strong; but the groundwater is of good recharge condition and high water pressure. Monitoring should be strengthen in the mining process, so as to make in time judge of water inflow changes and to ensure the mining production. (authors)