Pierce Butler, United States v. New River Company Slab Fork Coal Company…
“ The rating of a joint mine is calculated in the same way that the daily rating of a local mine is determined, except that its shipments over all carriers serving it are considered in determining its total capacity to produce coal. The figure so ascertained is called the 'gross daily rating,' in recognition of the fact that the rating of a joint mine does not represent its capacity to ship over each carrier on days when it uses more than one, but, on the contrary, represents its total daily capacity to ship over all lines which serve it. ”
