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Selecting Underground Mining Methods
3
Underground Mining Methods
By: Jeremy W. & Jake N.
Types of Mining Methods
- Cut & Fill Mining
- Room & Pillar
- Caving
Intro
Introduction
Purpose: To educate everyone on 3 significant mining methods
Why did we choose this?
We choose this topic because we are 1st year mining students, and we have found the mining methods quite interesting
We will be discussing 3 mining methods:
1- Room & Pillar
2- Caving
3- Cut & fill
Room & Pillar
Room & Pillar Method
- Best used on relatively flat orebodies and uses natural support (rock pillars). The orebody is mined out as completely as possible leaving ore/waste as pillars to support the back (roof).
- Dimensions of the pillars depend on factors such as the stability of the back (roof), stability of the ore, thickness of the deposit and rock stresses.
https://www.youtube.com/watch?v=cd8UuSgVuwk
0:14start
Caving
Caving
- Block caving involves undermining an ore body, allowing it to progressively collapse under its own weight. It is the underground version of open pit mining.
https://www.youtube.com/watch?v=eFNImszKld0
0:50end
Cut & Fill
Cut & Fill Method
-Cut and fill methods excavate ore in horizontal slices, starting at the bottom of a stope and advancing upwards.
- After a slice is mucked out, the mined out area is filled with backfill. The fill supports the walls and provides a working platform for mining the next lift.
- Cut & fill is best suited for steeply dipping orebodies, irregular orebodies, or weak host rock.
Types of Fill used in Cut & Fill Methods
Pastefill: Typically uses mine tailings with a cement binder delivered into the void by pipe.
Cement Rockfill: Uses specific waste rock sized and mixed with cement binder, usually delivered by truck.
Sandfill: Uses a mixture of sand and cement to fill in the mined out voids, also delivered by pipe.
https://www.youtube.com/watch?v=FUAQhKRc2OE
0:20start