88 



BULLETIN 42, UNITED STATES NATIONAL MUSEUM. 



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FiR. 0. 

 One division oltlip O.sceola Stainp Mill. 



of wliicli supplies two rows of rough- 

 ing jigs. There are also three rows 

 of finishing jigs, together with the 

 necessary settling boxes. One of 

 these divisions of the mill is illus- 

 trated in detail by figure 6. 



The crushed ore from the stamp A 

 is delivered, by the launder C to the 

 three separators B, which divide it 

 roughly into four classes, while the 

 slimes pass on to the settling boxes. 

 During the jigging on the head ma- 

 chines the copper settles out, and all 

 that is small enough, together with 

 some rock material, goes through the 

 sieve to form the hutchwork. All 

 that is too large remains on the sieve, 

 and is taken off from time to time. 

 About half a barrel of ragging is 

 skimmed off* during the day. The 

 jigs r> and C yield No. 1 mineral as 

 heads ; B sometimes yields No. 1, and 

 sometimes No. 2, while A yields No. 

 2 mineral. The hutchwork from this 

 set of jigs is fed to the top row ot 

 finishing sieves M, L, K, and I. The 

 tails from the head sieves go to the 

 first tail sieves E, F, G, and H, and 

 are rejigged. These sieves yield three 

 products, heads or ragging, hutch- 

 work, and tails. The hutchwork 

 goes to the middle row of finishing 

 jigs Q, P, O, and N, while the tails 

 go to the lake. 



The tails from the top row of fin- 

 ishing jigs pass on through settling 

 boxes to the middle row of finishing 

 jigs, and the tails from the middle row 

 pass through the last row. Sieves M 

 and L yield No. 2 mineral as heads 

 and also as hutchwork. Sieves K, I, 

 Q, and P yield No. 3 mineral, both as 

 heads and hutchwork. Sieves O, N, 

 U, T, S, and E yield No. 4 mineral as 

 hutchwork. This No. 4 mineral con- 

 tains a considerable amount of rock 



