In the northern parts of Cujo there are mines of gold and copper, but they are not worked owing to the indolence of the inhabitants. It has also rich mines of lead, sulphur, vitriol, salt, gypsum, and talc or asbestos. The mountains near the city of Juan are entirely composed of white marble, in stratified slabs of five or six feet long by six or seven inches thick, all regularly cut and polished by nature. From this the inhabitants prepare an excellent lime, which they use in building bridges over the streams and canals of irrigation. Between the city of Mendoza and La Punta, on a low range of hills, there is a large stone pillar, 150 feet high and 12 feet diameter, called the giant, on which there are certain marks or inscriptions resembling Chinese characters. Near the Diamond river there is another stone, having marks which appear to be characters, and the impression of human feet, with the figures of several animals. The Spaniards call it the stone of St Thomas; from a tradition handed down from the first settlers, said to have been received from the native Indians, that a white man with a long beard, formerly preached a new religion from that stone to their ancestors, and left the impression of his feet, and the figures of the animals that came to hear him, as a memorial of his sanctity.
The aboriginal natives of the province of Cujo are called Guarpes, of whom there are now very few remaining. They are of a lofty stature, very thin, and of a brown colour, and speak a quite different language from that of the Chilese. This people was anciently conquered by the Peruvians, after having taken possession of the northern part of Chili; and on the road across the Andes from Cujo to Chili, there still are some small stone buildings, or tambos, which had been erected for the accommodation of the Peruvian officers and messengers. The first Spaniards who attempted to reduce this country were sent by Valdivia, under the command of Francisco de Aguirre, who returned to Chili after the death of Valdivia. In 1560, Don Garcia de Mendoza sent a force under Pedro del Castillo, who subdued the Guarpes, and founded the cities of San Juan and Mendoza. The latter, which is the capital, is situated on a plain at the foot of the Andes, in lat 33° 54' S. long. 68° 34' W. This is supposed to contain about 6000 inhabitants, and is continually increasing in population, owing to its vicinity to the celebrated silver mine of Uspallatta, which is worked by the inhabitants to great profit. This city carries on a considerable commerce in wine and fruits with Buenos Ayres. The city of San Juan near the Andes, in lat. 31° 40' S. and long. 68° 34' W. is equally populous with Mendoza, from which it is about 160 miles due north, and trades with Buenos Ayres in brandy, fruits, and Vicunna skins. Its pomegranates are greatly esteemed in Chili, to which they are sent across the Andes. This city is governed by a deputy from the corregidor of Mendoza, assisted by a cabildo. In 1596, the small city of La Punta, or San Luis de Loyola, was founded in the eastern part of Cujo, in lat. 33° 47' S. long. 65° 33' W. Although the thoroughfare for all the trade from Chili and Cujo to Buenos Ayres, it is a miserable place with scarcely two hundred inhabitants; but its jurisdiction is extensive and populous, and is administered both in civil and military affairs by a deputy of the corregidor of Mendoza. Besides these three cities, the province of Cujo contains the towns of Jachal, Vallofertil, Mogna, Corocorto, Leonsito, Caliogarta, and Pismanta[51], which do not merit particular attention.