296 FANNING AND EDDINGFIELD. 
ton, fig. 2 shows the accumulative percentages of gold, and fig. 3 
shows the curve for the gold distributed in 1 ton of original. 
The high assays of the coarse meshes are largely due to the 
coarse free gold present. This is shown by Table X, which gives 
the values of the assay pulps and of the pellets saved (picked 
from the screen plus pellets saved on the 150-mesh screen in 
bucking down for assay) and calculated in proportion to the 
weight of the sample. 
TABLE X.—Showing assay of pulps and pellets of screen products. 
Lot No. 1. 
First screen test. 
| 
Second screen test. | 
Screen. eet ot Pellets. Total. Asser of Pellets. Total. 
| 
Mesh. Pesos. | Pesos. Pesos. | Pesos. Pesos. Pesos. 
10 88. 40 358. 00 446. 40 269. 60 321.20 590. 80 
20 194.10 172. 40 866.50 | 100.80 143. 30 244.10 
40 158. 30 3.00 161.30 | 101.30 2.00 103.30 
60 92.70 2.60 95.30 69. 80 none 69.80 
80 62. 90 none 62.90 | 69. 80 none 69. 80 
100 37.60 none 37.60 41.30 none 41.30 
150 14. 50 none 14. 50 16. 90 none 16. 90 
(—) 150 41.30 none 41.30 40. 10 none 40. 10 | 
It can be seen (1) that the pellets form the major portion of 
the value on the 10-mesh, (2) that they form about an equal 
value on the 20-mesh, (3) that they almost disappear on the 
40- and 60-mesh, and (4) that no pellets were obtained on the 
finer screens nor found when pulverizing these finer products 
through 150-mesh preparatory to assaying. 
CONCENTRATION TESTS. 
In the treatment of black sands, concentration is generally 
given the place of first importance, and the majority of pub- 
lished data is a consideration of this phase of the treatment. 
However, it is to be remembered that such treatment generally 
is applied to black sands as they are found in the ground, or else 
to those which have been only slightly concentrated. The sam- 
ples treated by us had previously been concentrated and so were 
distinctly different from the black sands generally under con- 
sideration. 
Panning tests—Panning tests were made upon the sample of 
lot 1 to determine: (1) If the free gold could be separated, (2) 
if a high-grade shipping product could be obtained, (3) the loss 
