229 FANNING AND EDDINGFIELD. 
was bucked through 150-mesh, a considerable number of gold 
pellets frequently were caught on the screen. These pellets were 
scorified or cupelled direct and the weight of gold was caleu- 
lated into the sample. For example, in making the assay of 
the 10-mesh product of the screen test on lot 1, 0.04220 gram of 
gold was picked out by hand, and 0.0220 gram was caught on the 
150-mesh screen. The picked gold calculated into the sample 
made a difference of 154.62 pesos, and the pellets made a differ- 
ence of 166.60 pesos. The pulp assay was only 269.56 pesos, 
making a total assay value of 590.78 pesos. On the 20-mesh 
product the picked gold made a difference of 141.20 pesos, 
while the pellets made a difference of only 1.90 pesos. With 
the finer meshes no pellets were obtained upon bucking down 
the sample sufficiently to pass a 150-mesh screen. 
To find the best method of assaying the pulp, experiments 
were carried on as shown by Table V. 
TABLE V.—Showing effect of different charges in assaying. Lot No. 1. 
(Original pulp through 150-mesh; 15 grams used in each charge.) 
Charge.*= Assay. | Average.) Variation. Pour. 
Grams. Pesos. Pesos. Pesos. 
| 183. 04 
30 litharge, 70 soda ___________ 5 188. 62 11.16 | Clean. 
194. 20 
. 180.34 | P) Some lead shot 
60 litharge, 40 soda __________- 194.20 188. 26 7. 86 ani theislac! 
; 155. 54 5 Much lead shot 
90 litharge, 30 soda __________- 158.24 156. 88 2.60 anitehenixes 
190. 06 | 
200. 40 | 
30 litharge, 60 soda, nails _____ i 194. 66 10.34 | Clean. 
H j 192.74 | 
195. 44 | 
In all charges 2.5 grams of borax glass and 10 grams of powdered silica were added; a 
borax cover was used. When nails were not used, 3.1 grams of argols were added. 
In order to obtain a clean pour, it was found necessary to use 
a long fusion at a high temperature. The time of fusion varied 
from one to one and one-half hours, and the muffle had to be 
kept at a yellow to white heat during the last half or three- 
quarters of the time. From the above table it is evident that 
the high soda was better than high litharge charge, yet the best 
results were obtained with the ordinary nails charge. It is to 
be noted that a variation of 10.34 pesos was obtained even with 
