This article investigates the relationship between the topology of hyperbolizable $3$-manifolds $M$ with incompressible boundary and the volume of hyperbolic convex cores homotopy equivalent to $M$. Specifically, it proves a conjecture of Bonahon stating that the volume of a convex core is at least half the simplicial volume of the doubled manifold $DM$, and this inequality is sharp. This article proves that the inequality is, in fact, sharp in every pleating variety of AH$(M)$
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