CRANE. | Addenda. 369 
modification was made in the construction, which consists in 
putting in high transverse partitions, thus changing from a 
multiple six cell to a six cell single-acting jig. The product 
fed to the jig, instead of passing from one cell to another un- 
til the full length of the jig has been traversed, is fed to each 
cell separately, and, on passing that cell, leaves the jig. The 
advantage of guard cells is thus eliminated from the work- 
ing of the jig. The products, namely, overflow, discharge, 
and hutch, are also obtained with this jig, and are probably 
cleaner than those otherwise produced. This jig is not 
claimed to be useful in handling other than low-grade min- 
erals, but with such and waste products from coarse con- 
centration, it seems to answer the purpose better than an 
ordinary multiple cell jig. 
There are two centrifugal pumps in the tailings mill. No. 
1 furnishes the mill with water, drawing its supply from the 
mill pond, and has suction and discharge 6 and 5 inches, re- 
spectively, being driven at a speed of 1500 revolutions per 
minute. No. 2 handles the discharge from the cleaner jig; 
has 4 inch suction and 3 inch discharge, and runs at a speed 
of 800 revolutions per minute. 
To the left of the tailings mill, and projecting into the 
driveway which runs between and separates the tailings mill 
from the slime department, is located a grizzly, horizontally 
placed, and level with the ground. This grizzly is 3x6 feet 
in plan, is made of 13 inch bars, spaced 1% inches apart, and 
receives the materials fed to the tailings mill. 
THE SLIME DEPARTMENT. 
The slime-treating part of the plant receives a portion of 
the material treated therein from the tailings mill, as does 
the latter from the slime department, the two parts being con- 
‘nected by launders. 
The concentrating apparatus installed in this portion of 
the plant consists of buddles, tables, and trommels. 
There are two large convex buddles, which are 20 feet in 
diameter, with 6 foot drums and distributing aprons. The 
bottoms of the buddles have aslope of about 1 inch to the foot. 
There are six sweeps to each buddle, which are driven at a 
