more files: #coalmine

Bucket-wheel exca.. 7s	Coal mine with bu.. 11s	Bucket-wheel exca.. 10s	Coal mine with bu.. 7s
Coal mine with bu.. 12s	Belt conveyor in .. 7s	Coal pit for brow.. 8s	Coal mine with bu.. 8s
Coal mine with bu.. 8s	Coal mine with bu.. 7s	Coal mine with br.. 10s