secondary haulage

secondary haulage

[′sek·ən‚der·ē ′hȯl·ij]
(mining engineering)
That portion of the haulage system which collects coal from gathering-haulage delivery points and delivers it to the main portion of the system.
References in periodicals archive ?
Those supplying the Lake District and Haverfordwest creameries, in balancing milk fields or supplying milk to the liquid market where significant secondary haulage is used will see no change in prices.