The greatest impediment which white labor has to encounter in the mines, is the intensity of the heat, and the prevalence of bilious disease. The one is almost insufferable, while the other is pestilential. Against both of these the negro is almost proof. Now, while white labor is so high, it is evident that no one can hire a white laborer, except at a rate that would consume his profit. Not so with negro labor. That species of labor might be obtained for half the amount which you would have to pay for white labor. The result would be a profit alike to the hirer and seller of slave labor. There is no doubt, in my judgment, that almost any number of slaves might be hired out in California, were the whites willing to allow it, at from eight to ten hundred dollars a year. This is pay so much above what their services command in the states, as to satisfy any one, that could this species of service be protected in California, it would rush to the Pacific in almost any quantity. Let us next turn our attention to Utah and New Mexico. I have no doubt, from what knowledge I have of those countries, that they will turn out to be filled with the richest mines. I clip the following from a recent paper, containing the news from Texas and Chihuahua:-- “Mr. James was informed, by Major Neighbours and Mr. Lee Vining, that they had been shown by Major Stein, some gold washed out by his troops, on the Gila River, in a short excursion to that stream. “It is reported, that, at the copper mines above El Paso, there are about one hundred tons of pure copper lying upon the ground. This had been got out by Mexicans, and abandoned when attacked by Indians. “There are at El Paso, in the hands of different persons, several large amounts of silver ore, taken from the mines in that neighborhood. With guaranties of titles to lands, and protection from Indians, only a short time would elapse before all these mines would be well worked, and we would have large quantities of metal seeking a market through this place.”