238 FANNING AND EDDINGFIELD. 
The magnetic test of lot 2 gave a nonmagnetic product worth 
170 pesos per dry ton, and this could be shipped at a total cost 
of about 47 pesos, leaving a profit of about 123 pesos per ton 
of shipped product. On the other hand, direct shipment of the 
concentrates without magnetic treatment would cost about 42 
pesos per ton and with a product worth about 103 pesos per dry 
ton; this would give a profit of about 61 pesos per ton of shipped 
product. However, for true comparison of the methods, the 
relative tonnages and the extractions should be taken into con- 
sideration as follows: 
TABLE XX.—Comparison of shipment costs. 
- 
Magnetic separation and 
Baioriens Direct shipment. 
Factor. 
Value of product -__-----__---- 1.7 tons of original, worth a | 1.7 tons at 103 pesos equals 
total of 175 pesos, separates to 175 pesos. 
1 ton worth 170 pesos. 
Cost of treatment -___--.------ 5 pesos for 1.7 tons -__-----_---- None. 
Loss in tailings ______--___--__- 5:25 pesOS ho oe se aeaeeae eee eee None. 
Shipment and smelting cost -__| 47 pesos_____.------------------- 71 pesos for 1.7 tons. 
Totalicost=ss2-ss-= sone see ee 57/25) pesos--—2-2-s=2---—-- saan 71 pesos. 
Profit on 1.7 tons of original-_--| 112.75 pesos____--__---_-------_- 104 pesos. 
As shown by this table, if 1.7 tons of original are treated mag- 
netically and shipped, there is a profit of about 113 pesos, while 
if these 1.7 tons were shipped direct, the profit would amount 
to 104 pesos. This indicates an advantage in favor of magnetic 
treatment previous to shipment. Before deciding this point, it 
would be advisable to make more extensive tests using a well- ; 
known type of machine. 
AMALGAMATION TESTS. 
In making amalgamation tests the sample was placed in a 
1-liter bottle; about 2 parts by weight of water, 6 to 8 cubic cen- 
timeters of mercury, and about 1 gram of sodium hydroxide 
were added, and the bottle revolved for one hour. The mercury 
and the gold amalgam were then collected by panning and 
the mercury was dissolved with nitric acid. The gold, which 
generally was beautifully crystallized, was then cupelled with the 
