The main chamber roadway includes the main shaft and auxiliary shaft, central substation, water pump house, waiting room, main haulageway
, and passby roadway.
One of these improvements, already started in 1909 by Leach, was a crosscut adit that would become the 2200L haulageway
1150 feet (350 m) below the lowest production level.
The veins are approximately 500, 1000 and 1500 meters, respectively, southeast of the Tiro General (= General Shaft), the main deep haulageway
for Cerro Proano.
The plan was to first remove the sloughing, decomposed granite that continues to build up over the old main haulageway
from the slope above.
It shut down in February of 1975, in its later years sending its ore over a long haulageway
to the Kelley shaft for hoisting.
It was discovered by a cooperative about 50 meters above the Zero Level, on the southeast side of the mountain: on working it downwards it was found to cut the busy main haulageway
(zero level) of the Pailaviri mine, a couple of kilometers from the entrance on the north side of the mountain.