112 DOTTINGS ON THE ROADSIDE. [Chap. YIII.—B. S. 
of the vein, 160,000 cubic yards, or 328,000 tons, all 
of which will probably yield at least a general average 
of one ounce per ton, and perhaps more, for the quality 
of the ore improves the deeper the mine is driven. 
But when large quantities of auriferous quartz can be 
obtained in a country where the price of labour is not 
high, as in Nicaragua, it is not necessary that it should 
contain a large amount of the precious metal in order 
to render its treatment, by the aid of well-constructed 
machinery, remunerative. At Schemnitz, in Hungary, 
the managers extract with advantage one-eighth of 
an ounce per ton; and the St. John del Bey, in the 
Brazils, yields a noble profit with five-eighths of an 
ounce per ton. Again, the average yield of gold from 
the quartz reefs in the colony of Yictoria, for the year 
1866, was 10 dwts. 16J grs., a little more than half 
an ounce to the ton of quartz, at a cost of raising, 
crushing, and management of about 13s. per ton; the 
actual profit would, therefore, be about 17s. on every 
ton of quartz crushed. The very tailings of the 
Javali, which have now accumulated for many years, 
are equal in richness to the quartz reefs of Australia, 
the yield being 11 oz. of silver, and oz. of gold to 
the ton. 
The discovery of the Javali, or rather the betrayal 
of its existence by the Indian, led to the exploration 
of the surrounding district, and the finding of more 
than three hundred mines of more or less importance. 
A proper geological survey of this undoubtedly rich 
district, rich in both silver and gold, has, however, as 
yet not been attempted, though it might be expected 
