Determination of Intervening Pillar Thickness Based on the Cusp Catastrophe Model

Figure 3

(a) 1^st and (b) 2^nd boundary conditions of the intervening pillar. 1, top pillar; 2, nonrecoverable orebody; 3, ore grade limit; 4, recoverable orebody (intervening pillar); 5, bottom pillar; 6, surrounding rock; 7, ore-rock boundary; 8, orebody (intervening pillar).

(a)

(b)