Prospecting at the Yaguki Mine and its Effects

Abstract

At the first stage, the distribution of skarn zone has been surveyed by the geophysical magnetic prospecting.
Then, the existence of ore body in the skarn zone has been confirmed by twenty-five long vertical bore-holes on the ground surface.
On account of this result, more precise boring investigation has been done successively for every 100 meters level underground, and consequently exploration was carried out in the levels one by one.
Since 1955, 45, 170 meters of boring and 18, 000 meters of drifting have been carried out by us to confirm the dimension and the grade of the deposit, and eight million tons of ore reserves have been discovered.
On the other hand, these ores of the respective grades, transported from each drift and face, were sampled and analyzed more precisely on the pilot dressing plant having 200 t/day capacity.
These survey works contributed a great deal to our schedule for the future development of this deposit.