BLACK SANDS OF PARACALE. 233 
A new table was calculated to show the actual recovery on each 
screen, and the distribution of values in the magnetic and non- 
magnetic portions after amalgamation where a ton of original 
as treated. This is shown in Table XVI. 
TABLE XVI.—Screen amalgamation test to accompany Tables XIV and XVII. 
Goa | mation tase | Total, 
Screen. amalga- |__| gama- 
mated. tion 
Nonmag-| Mag- tails. 
netic. netic. 
Mesh. . Pesos. Pesos. Pesos. Pesos. 
MQ Eo eo seen Wee a Hennes 12 Se ee 22. 96 7.22 0. 82 8.04 
(RIE see SE iors a dR Bee A Pe 39. 22 6.70 1.24 7.94 
a i EE OE EE a 12.16 5.34 0. 60 5.94 
GO See ese eee ween ote oa tenn eant eee eee ans eo eee 7.74 2.22 0.18 2.38 
BO) eee ee erent | re Ue ota Us Do eek eae 4.34 5.24 0.24 5.48 
0 See eae one wenn ne sence ee aaa eee ass see eee 3.04 0.78 0.16 0.94 
N50 See oan ona aeco sa ee swe tsenescaeeSecne see esceec ee 1.20 2.00 0. 40 2.40 
(0 Saeemmeemaea nae Une ece en oe nee Sue: ele see 3. 68 0. 66 0.08 0.74 
otal ease oe ee oe ae cae ease nese a awe eee eee 94.34 30. 16 3.80 33. 96 
8 Based on gold accounted for and evidently low. 
As shown in this table, a ton of original worth 128.30 pesos 
is screened to give 8 products, and on the 10-mesh 22.96 pesos 
were saved by amalgamation; on the 20-mesh, 39.22 pesos were 
saved; etc. The tailings of each screen were then divided into 
nonmagnetic and magnetic portions, and the 10-mesh nonmag- 
netic contained 7.22 pesos worth of gold, the 20-mesh non- 
magnetic contained 6.70 pesos, ete. By the totals it is seen that 
out of the 128.30 pesos contained in the original, 94.34 pesos are 
saved by amalgamation, 30.16 pesos are found in the nonmagnetic 
after amalgamation, and 3.80 pesos are found in the magnetic. 
It is to be noted that the heads assay of 128.30 pesos is assumed 
from the totals of the accountable gold and in comparison with 
other assays of lot 1; this value is low and it seems that there 
has been a considerable loss of gold in the process as explained on 
page 239. 
By calculation it was found that 96.5 per cent of the gold is 
found in the nonmagnetic as indicated by the results given in 
Table XIV. The percentage for each mesh is shown in Table 
XVII. 
