As of 2021 there were 31,800 people employed as Crushing, Grinding, and Polishing Machine Setters, Operators, and Tenders within the United States.
This represents around 0.02% of the employed workforce across the country.
Put another way, around 1 in 4 thousand people are employed as Crushing, Grinding, and Polishing Machine Setters, Operators, and Tenders.