Patent ID: 6322292
Filing Date: 2001-11-27
Classification: C04B,E02D,E21F,Y02W

Abstract:
A method for filling an underground mine void without causing mud slides in said void, with material pumped from a site which is located remote from said underground void, said method comprising the steps offorming a fluid, cementitious fill material by mixing:hydraulic cement;water;milled mine tailings in an amount sufficient that said fill material has a solids content of 74% or greater, so as to prevent said fill material from undergoing fluidic collapse in said underground void before said fill material sets; andstable bubble foam material in an amount sufficient to enable said fill material to be pumped over a predetermined distance from said remotely located site to said underground void; andpumping said cementitious fill material into said underground void so as to substantially fill said void.