278 PERU. 
The produce of the mines since the close of the revolutionary 
war has amounted to the following, viz. : 
MARCS. OZ. 
In 1825, 228 bars, . . weighing 56,971 6 
1826, 818 163,852 
1827, 1068 221,707 7 
1828, 922 201,338 
1829, 359 82,031 
1830, 457 96,265 
1831, 635 135,139 3 
1832, 994 219,380 5 
1833, 1133 256,333 2 
1834, 1142 267,363 4 
1835, 1148 276,813 2 
1836, 991 244,404 1 
1837, 1172 234,785 3 
1838, 1172 248,022 6 
1839, 1210 279,260 3 
To this may be added one-fifth for silver that has not paid duties. 
The first adit of importance driven into the mines was that of San 
Judas, which passed the wall of the vein of Zauricocha in the year 
1794. By means of this adit very rich ores were raised, especially 
from the king's mine. In the year 1808, the present deep adit, from 
which so much was expected, was begun ; for covering the expenses 
of constructing it, the body of miners imposed a duty of one real per 
marc on all silver melted in the government assay-office. This adit 
reached in 1830 the southwest edge of the metalliferous ground of 
Santa Rosa, up to which time the whole of its course had been in a 
hard rock. An auxiliary adit was then commenced, fifty-four feet 
above the level of the main one, and both of these works have been 
carried on until the present time. The ground above being better 
adapted for driving in, the upper adit is in advance of the lower, one 
thousand five hundred feet, and has arrived at the district of Cayac 
The lower adit has reached the mines situated upon the vein of 
Zauricocha, without having cut a single vein or deposit of ore in its 
transit. There are several rich mines a little in advance of this adit 
some of which have been hitherto drained by hand-pumps, and which 
must be shortly very much benefited by it, for, although they extend 
below the level of the adit, yet they will have some fifty feet of pump- 
