Carelessness, or rather the avidity of the overseers destroyed this celebrated mine for a time, as this being the only royal mine in Spanish America, these men were anxious to obtain as much profit and credit as they could by sending great quantities of the mineral to the royal office. The gallery of the _Brocal_, which was the uppermost, was supported by pillars of the rock containing the ore; as the mineral became scarcer in the body of the mine, these pillars were thinned, and at last cut away, so that the roof fell in and hindered all communication with the other parts. At present, it is said, some attempts are making, owing to the dearth of mercury from China, to re-open the gallery; but the silver works of Peru are mostly supplied from small veins which are found in other parts of the same chain of mountains, near _Silla Casa_; these veins generally traverse alpine limestone, are full of calcedony, and although thin, they cross and form masses, from which the Indians, who are allowed to work them, are said to obtain 3000 quintals annually by merely uncovering the surface. The chief town of this intendancy is _Guancavelica_, thirty miles north-west of Guamanga, in 12° 45' south latitude, and 74° 46' west longitude. It was founded, in 1572, by the viceroy Toledo, and stands in a breach of the Andes, being one of the largest and richest cities of Peru. The temperature of the air at Guancavelica is very cold, and the climate changeable, as it often rains and freezes on the same day, in which there are tempests of thunder, lightning and hail. The houses are generally built of tufa found near a warm spring in the neighbourhood, and there is a dangerous torrent near the city, which is crossed by several bridges. This town was founded on account of the quicksilver mines of Santa Barbara, from the working of which the inhabitants derived all their subsistence. In this intendancy with its dependencies of _Castro Vireyna_ and _Lircay_ there is one mine of gold, eighty of silver, two of quicksilver, and ten of lead. Guancavelica is 12,308 feet, and the neighbouring mountain of Santa Barbara 14,506 feet, above the level of the sea. The number of its inhabitants is now only 5200, probably owing to the abandonment of the mine. The other towns of most note are Xauxa and Castro Vireyna. _Xauxa_ or _Jauja_ is the chief town of a district on the southern extremity of Tarma, reaching to about forty leagues from Lima, in the spacious valleys and plains between two parallel chains of the Andes. The river Xauxa runs through this district, in which there are several pretty towns or large villages well inhabited by Spaniards, Indians and Mestizoes.