tributary area concept

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tributary area concept [′trib·yə‚ter·ē ¦er·ē·ə ‚kän‚sept]

(mining engineering)

A theory that the weight to be supported by a square coal pillar should equal the weight of the rock strata above it plus the weight of rock equal in area to one-half the size of the opening adjacent to all four sides of the pillar.

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