330 University Geological Survey of Kansas. 
12. Bin, sold to custom mills. 
13. Galena to bin. 
14. Blende to bin. 
15. Dump. 
This arrangement of concentrating apparatus is probably 
more typical than the one given above, with the exception of 
the two-story arrangement. A few mills in the Joplin por- 
tion of the district are built along the same lines, of which 
the Lackawanna, of Chitwood hollow, is an example. 
Class III. 
The arrangement and system of concentration employed in 
the third class can be readily shown by the following outline, 
which is taken from Allen Bros.’ sludge miil, situated just 
west of the Jim Murphy custom mill, Galena. 
Ore hauled by wagon to 1. 
Mill; ore fed to 2. 
Trommel, ;-inch holes ; yields oversize to 3, undersize to 4. 
. Elevator to 7. 
. Buddle (22 feet in diameter); yields, first, 12 inches to 5; second, 12 
inches to 5; third, 12 inches to 5, waste (tailings) to 11. 
5. Buddle (20 feet in diameter); yields, first, 6 inches to 6; next, 12 
inches, with first 12 inches of 4, to 5; next, 12 inches to 5. 
6. Hand buddle (4x8 feet); yields, first, 12 inches to 10; next, 24 inches 
to 6. 
7. Hand jig, $-inch spaces; yields discharge middlings (chats) to 8, 
hutch (smittem) to 9. 
8. Bin; sold to custom mills. 
9. Hand jig, $-inch spaces, with filter bed of ore or scrap iron; yields 
heads on bed to 10, hutch to 10. 
10. Blende to bin. 
11. Dump. 
The system of treatment employed in the sludge mills is 
flexible and varied as the ore varies in richness. 
DRAINAGE. 
As the floor area of the mines is small, and as its forming 
is wholly under the control of the miner, almost any ar- 
rangement to facilitate the drainage may be obtained. Usu- 
ally the ‘‘sump’’ is the lowest point of the working, so that 
all water collects at that point, from which it may be pumped 
by different forms of pumping appliances. 
As the mines are comparatively shallow, little or no diffi- 
