==1.0 Classification of Pillars== ===1.1 Support Pillars===
Support pillars are load carrying. Examples of support pillars include:
|Type of Pillar||Description|
|Sill Pillar|| Horizontal pillars that separate levels or stopes,
often used when multiple levels are mined concurrently.
|Room and Pillars||Pillars are left in place in a predetermined
and calculated pattern as rooms are mined out.
|Yield Pillars||Pillars are designed to fail by going past
peak load carrying capacity. Roof-strata is maintained by relieving pressure in working areas and controlling transference of load to abutments that are clear of working areas and road ways. Yielded pillars still carry load.
|Post Pillars||Room and pillar variation where ore is mined
out in a series of horizontal slices.
|Barrier Pillars||Solid blocks left between two mines or sections
of a mine. Provides regional support in large mines to prevent accidents due to inrushes of water, gas, or explosions or a mine fire.
|Bracket Pillars||Slip on discontinuities may cause rockburst
within stopes, which can cause equipment damage and injury or loss of life. Ore immediately adjacent to these geological structures is left unmined to protect the structure from mining induced stresses.
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