rule of approximation

rule of approximation

[′rül əv ə‚präk·sə′mā·shən]
(mining engineering)
A rule applicable to placer mining locations and entries upon surveyed lands, to be applied on the basis of 10-acre (40,469-square-meter) legal subdivisions.
References in periodicals archive ?
Cohan established the rule of approximation: if it can be proved that something was spent, then the taxpayer can deduct travel and entertainment expenses.