Underground Hard Rock Mining Techniques

Sublevel caving

Block caving (correct)

Room and pillar mining

Longhole open stoping

For narrow, shallow, and compact orebodies

For small, deep, and brittle orebodies

For high tonnage from a massive weak orebody (correct)

For moderate tonnage and strong orebodies

Application in large orebodies

Progressive undercutting slices

Gravity-assisted ore collection (correct)

Vertical dimension exceeding 100m

<p>Steeply dipping or horizontal orebodies</p> Signup and view all the answers

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