A low-grade steep-seated ore body dipping at \(70^\circ\) has a strike length of \(2\ \text{km}\) and width \(100\ \text{m}\). The ore body and wall rocks are weak and fractured. The preferred method of mining is
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Block caving is preferred for
\[
\boxed{
\text{Large, low-grade, steeply dipping, weak and fractured ore bodies.}
}
\]