dredge vs sluice box

dredge

noun
  • Very fine mineral matter held in suspension in water. 

  • A mixture of oats and barley. 

  • A large shaker for sprinkling spices or seasonings during food preparation. 

  • A dragnet for taking up oysters, etc., from their beds. 

  • An iron frame, with a fine net attached, used in collecting animals living at the bottom of the sea. 

  • The act of dredging. 

  • A dredging machine. 

verb
  • To make a channel deeper or wider using a dredge. 

  • To bring something to the surface with a dredge. 

  • To sprinkle (food) with spices or seasonings, using a dredge. 

  • To unearth. 

sluice box

noun
  • A box with riffles along the bottom, used to trap heavier gold particles as water washes them and the other material along the box. 

How often have the words dredge and sluice box occurred in a corpus of books? (source: Google Ngram Viewer )