In sorting coal they were keenly looking for non coal minerals like regular rocks secondly they could have been looking for lower grades of coal.
Had the folks of my family lived in coal bearing regions one of those ladies could have been my mother she would have been in just about the correct age bracket.
Never try to tell me it can't be done
When I have to paint I use http://kbs.justoldtrucks.com/
Fullsize image: https://s3-us-west-1.amazonaws.com/h...s_fullsize.jpgPin boys working in Subway Bowling Alleys, 65 South St., B'klyn, N.Y. every night. 3 smaller boys were kept out of the photo by Boss. April 1910.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...w_fullsize.jpgStriping and painting the crosswalk on SE Hawthorne Boulevard and SE 49th Avenue looking east in Portland (OR), 1939.