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The principal mines along the route were those in the Slate Range district and the Johnson district, Ivanpah, the mines on Lynx Creek, near Prescott, and the mines in the Black Hills, near Camp Verde.

The Slate Range mines are so named from the mountains in which they are situated; they have been deserted for several years in consequence of the failure of the company working them.

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The principal and best yielding are the black ores, known as stromeyerite and stedefeldtite; the ledges are narrow and between slate walls. One tunnel had been run 500 feet, but failed to reach the ledge at that distance. Machinery for milling gold-ore, found near, have been erected, but the results obtained were not remunerative, and, the funds of the company being soon exhausted, the whole district was abandoned. Some of the former owners now state that if the amount expended in working low-grade gold-rock had been applied properly to the development of the silver leads the result would have been different. With regard to this I cannot give an opinion, as the imperfect knowledge acquired by me of the locality of these mines was insufficient to enable me to find them.

The Johnson district is near Desert Springs, and all the leads discovered are composed of lead and copper. Nothing has been done toward developing the district; no assays have been made, and the mines are not valued very highly. Several specimens were obtained and have been added to your collection.

The Ivanpah mines having been visited and examined by yourself, no report from me is necessary.

The mines near Prescott, on Lynx Creek, are worked only for free gold. But little has been done here except to prospect in a rude manner. The old Mexican arrastra is used, and with it the ore yields from $20 to $45 per ton. Some of the shafts are down 25 feet and show well-defined walls nearly vertical.

The vein-matter is very much disintegrated, most of it crumbling easily in the hand with a slight pressure. Assays have been made several times by assayers at Prescott, but their results were so unsatisfactory that they were not given. The whole bed of the creek has been dug over, and in some places quite rich deposits of placer gold have been found. The prevailing opinion is that the placer diggings have all been worked over once, probably by the race of beings the record of whose existence consists now only in the curious ruins occasionally found and the fragments of pottery scattered over the country.

At present but very little is being done here; a few prospectors who are able to obtain sufficient water are taking out a little gold, but only enough to purchase supplies with which to live. The Indians have killed several miners, and small parties are consequently deterred from locating here. Nearly all the creeks and ravines near Lynx Creek show gold in small quantities, not enough, however, to cause any extensive operations to be inaugurated; and the few mills that have been started are now deserted and have been for some time. With improved methods of working these deposits they may in time be made to pay, but the supply of water is limited, and this will always prove a great drawback to anything like extensive operations.

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