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A majority of the Mesilla inhabitants are Mexicans, but they will be controlled by the American residents, whose number and influence is constantly on the increase. The Santa Cruz Valley, in which are situated the towns of Tueson, Tubac, Tumacacari, and the mining settlement of Sopori and others, is, next to Mesilla, the most thickly settled.

The writer has examined specimens from the "Sopori," taken at random, and so rich is the ore that the native silver can be cut out of it with a penknife, as out of a Mexican dollar. Undoubtedly the Sopori mine is destined to yield hundreds of millions. It is a peculiarity of the ores in this district that they run near the surface, making mining of comparative small cost.

Evidences of old works are seen on many of the water courses, but operations have not yet been recommenced, except at Arizona, Sopori, and Ariaola, principally because the country is very partially settled, and it is not safe to be at any distance from the mass of the population, and the troops. Copper ore is found in many localities, but little gold is yet discovered.

This valley, of the richest land, is about one hundred miles long, in many places of great width, and has on each side of it many rich valleys of limited extent, watered by streams from the mountains, which flow into the Santa Cruz. The valleys and Ranches of Arivaca, Sopori, Calabazas, and Tueson, are those at present most thickly settled.

The invasion was generally discouraged by the settlers on the Santa Cruz. When they passed by Sopori on their way to join the main body, I remember very well the advice of old Colonel Douglas, a veteran in Mexican revolutions. He said, "Boys, unless you can carry men enough to whip both sides, never cross the Mexican line."

Booth, U. S. Assayer, as well as other distinguished authorities, have, after thorough experiment, given to the company certificates of the great richness of the ores already shipped to the east. The annual report of the Sonora Mining Co. is full of interest to the general reader. The Sopori mine is another very valuable property. It is owned by Messrs. Douglass, Aldrich, and another.

The Sopori mine is surrounded by a fine country, well watered and wooded. The "Gadsonia Copper Mining Co.," after taking out a few tons of exceedingly rich ore averaging over eighty per cent. was obliged to suspend operations on account of the cost of transportation. When the Territory shall be organized and capital protected by law, these mines will be worked to advantage.