Average of
Grade. No. kilos. mercury. grade.
Metal { 1. 81,890 23.86 }
{ 2. 14,970 22.65 } 24.80
Requiebro { 3. 12,240 15.20 }
{ 4. 17,000 10.50 } 12.47
China { 5. 31,890 3.84 }
{ 6. 32,360 1.17 } 1.75
{ 7. 28,960 0.10 }
Vaciscos 8. 78,320 9.24 9.24
This general average of 12.28 per cent. of mercury is pronounced
higher than the usual run of the ore, which, it is stated, does not go
above 7 to 8.50 per cent.
The furnace in which the ore is treated is cylindrical, 2 meters in
diameter, and 3.70 meters high from a brick grate, supported by three
arches to the arched roof. At the level of the grate is a charging
orifice, and near the roof are openings into two chambers, from the
bottom of which extend 12 lines of aludels, clay vessels, open at both
ends, the middle being expanded. The mouth of one fits into the back
end of the one following, a channel being thus formed through which
the fumes to be condensed are passed. The lines of aludels which are
laid on the ground terminate in a chamber, and for half the distance
between the furnaces and these chambers the ground slopes downward,
while for the other it slopes upward.
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