目前,克里沃罗格铁矿区大多数矿山开采深度达到700～1000m,上部中段几乎都有许多未处理的空硐,下部中段开采时已崩落的岩石很可能移动,在地表形成漏斗。现在已出现了一些不同的一次、二次和混合漏斗.靠近表土的上部矿体开采之后,下部矿房顶柱崩落时会形成一次漏斗,首先在表土层形成漏斗,然后在坚硬的顶盘岩石中形成漏斗.盲矿体开采后,如果采空区达到了临界尺寸, At present, most of the mines in the Krivolugar iron ore mine reach a depth of 700-1000 m. There are almost no untreated hollows in the upper middle section. Rocks that have been falling during mining in the lower middle section are likely to move and form funnels on the surface. Several different primary, secondary, and hybrid funnels have now emerged.After the upper ore body near the topsoil has been mined, a funnel forms at the top of the lower morgue, first forming a funnel in the topsoil and then in a hard top rock In the formation of funnel blind ore mining, if the goaf reached a critical size,