Brown panel system

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  1. See: pillar-and-breast
  2. Coal mining by long rooms opened on the upper side of the gangway. The breasts are usually 5 to 12 yd (4.6 to 11.0 m) wide and are separated by pillars (solid walls of coal broken by crossheadings for ventilation) 5 to 12 yd thick. The pillars are robbed by mining from them until the roof comes down and prevents further working. Syn: block system of stoping and filling


Source: Dictionary of Mining, Mineral, and Related Terms


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