Pillar design

==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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