The most expensive detail of placer mining is the picking of the gravel and the shoveling into wheelbarrows or cars. ... One such machine worked to the entire satisfaction of the inventors in a snowbank at surface but balked when taken underground. ... In estimating working costs it is usually counted that a shoveler will strip from 30 to 35 sq.ft. of bedrock per daya ... These are kept in good repair at all times and are laid aside for resharpening as soon as they become worn and dull.
|Title||:||Mining Journal Volume C|