from The Century Dictionary.
- noun In mining, the burrow or refuse-heap at the mouth of a shaft or adit-level: a term little used except in parts of England, and there chiefly in coal-mining.
Sorry, no etymologies found.
His feet took him by an unfrequented way, and in the course of an hour's devious ramble he found himself on the canal spoil-bank.
Leaving the bed of the canal in which I was walking and making a slight detour, I came suddenly over the spoil-bank of the canal on to the place where the bird had been calling.