(1) A steeply inclined ore body with an ore body thickness greater than 10 to 15 m and a thicker ore body of any dip angle are available.
(2) Nuggets with no natural tendency to collapse above medium hardness.
(3) The stability of the surrounding rock of the upper and lower plates should ensure that the depletion is not caused by the early collapse when the compensation space is opened. For extremely thick ore bodies, any stable surrounding rock can be used.
(4) The ore is non-caking and self-igniting.
(5) The surface is allowed to collapse.
Overall, the stage collapse method is suitable for mining low-grade thick ore bodies.
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