Mineral Resources of the United States, 1892 . bly treating auriferous sulphurets, which has so often proved aninsurmountable obstacle to the continued development of gold obstacle has, however, already been successfully overcome in theTreadwell mine by the adaptation of the chlorination process. The annual product of the Territory, which is given as exclusivelygold (the silver product being comparatively insignificant) shows asteady increase during the decade. This increase is remarkable rather forits regularity than its amount and is hence of more favorable import forthe permanenc
Mineral Resources of the United States, 1892 . bly treating auriferous sulphurets, which has so often proved aninsurmountable obstacle to the continued development of gold obstacle has, however, already been successfully overcome in theTreadwell mine by the adaptation of the chlorination process. The annual product of the Territory, which is given as exclusivelygold (the silver product being comparatively insignificant) shows asteady increase during the decade. This increase is remarkable rather forits regularity than its amount and is hence of more favorable import forthe permanency of the development of the mineral resources than wouldbe one subject to violent fluctuations, for while the discovery of excep-tionally rich ore bodies undoubtedly causes a rapid development of thedistrict in which they occur, the reaction which follows the inevitableexhaustion of such bodies may more than counteract the good effectwhich they have had, so far as its permanent prosperity is concerned. Production of gold in Alaska since ARIZONA. But little is known with certainty about the geological relations ofthe ore deposits of Arizona, no systematic geological studies yet hav-ing been made of the Territory as a whole, nor of any of its rich miningdistricts. As its name indicates it is a generally arid region, the arid-ity increasing from the east, westward and southward, the western partof the Territory, though traversed by the Colorado river, having thedesert features that characterize the greater part of Nevada. The northeastern portion forms part of the Colorado plateau, aboutone-third of which is included within the boundaries of Arizona. It isan elevated region supporting some forest growth, and as contrastedwith the rest of the Territory is fairly well watered. To the southwestof the plateau region are a series of narrow isolated ranges separatedby broad arid valleys, similar to the basin ranges of Nevada, with which,by their general northwesterly trend, they
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