Many of the older buildings are of a brown sandstone, quarried in or near the city.
As quarried or mined free sulphur is always contaminated with limestone, gypsum, clay, &c.; the principle underlying its extraction from these impurities is one of simple liquation, i.e.
Granite and limestone are quarried in the vicinity.
A thriving export trade is carried on in agricultural produce, condensed milk is manufactured, and slate is extensively quarried in the neighbourhood, while some coal is exported from the neighbouring fields.
Limestone quarried in the same year was worth $124,690; and sandstone was valued at $39,216.