328 - University Geological Survey of Kansas. 
When slime-washing apparatus are employed, the prelimi- 
nary work is done by rolls and jigs, the fine slime from the 
sand jigs being delivered to buddles and tables, from which 
the waste material escapes to the tailings pile. 
Usually, however, the slime-washing apparatus are located 
in separate mills, which are designed especially to operate 
upon the refuse from the other concentrating plants, in which 
case the jigs are usually dispensed with. 
The concentrating mills of this district can then be placed 
in three classes, according to the method of treating slimes: 
First, mills employing classifiers; second, mills in which no 
systematic attempt is made to save the slimes, except to 
allow them to run first into a settling box, the settlings being 
sold to the third class or the sludge uiills. 
The synopses of a few of the methods employed in different 
portions of the district will be given, and may be considered 
as typical of the systems generally employed. ‘They will be 
considered by class, in the order given above: 
Class I. 
Ore hoisted to 1. 
Crusher room; ore to 2. 
Grizzly, 5-inch spaces; yields oversize to 3, undersize to 4. 
Sledge; waste to 21, ore to 4. 
Shaking grizzly, 14-inch spaces; yields oversize to 5, undersize to 6. 
Blake crusher, 9x 14-inch jaw, reducing to ? inch; ore to 6. 
Rolls; ore by elevator to 7. 
Trommel, 8-inch holes; yields oversize to 8, undersize to 9. 
Rolls; ore by elevator to 7. 
Harz jig (five sieves), 4-inch spaces; yields, first, discharge galena to 
16, hutch to 15; second, discharge blende to 17, hutch to 15; third, 
discharge middlings to 10, hutch to15; fourth, discharge middlings 
to 10, hutch to 15; fifth, discharge middlings to 10, hutch to 15, 
waste to 18. 
10. Rolls; ore by elevator to 11. 
11. Trommel, 4-inch holes; yields oversize to 10, undersize to 12. 
12. Spitz kasten; yields spigot to 18, discharge to 14. 
13. Harz jig (five sieves), 5 mesh to inch; yields, first, discharge ga- 
lena to 16, hutch blende to 17; second, discharge blende to 17, 
hutch blende to 17; third, discharge blende to 17, hutch blende to 
17; fourth, discharge blende to 17, hutch blende to 17; fifth, dis- 
charge blende to 17, hutch blende to 17, discharge to 19. 
14. Spitz kasten (three boxes); yields first, second and third spigots to 
13, discharge to 20. 
§2 £9. SI So ON ES Co SF 
