Publisher's Synopsis
Excerpt from Model of an Arizona Gold Mine
This model represents a small gold mine of med ium richness in a vertical quartz vein six feet wide. The vein and mine workings are presented in section, that is, as they would appear if they were cut through along the center of the vein and one-half removed.
This model is intended to illustrate the ordinary features present in some form in the great majority of all metal mines and to show the orderly manner in which mines are developed and the ores extracted.
Great diversity in the nature and structure of ore deposits compels a corresponding variety in the details of workings by means of which the ores of these de posits are extracted.
However diverse these details may be, they all may be grouped as parts of major features which are common to nearly all metal mines.
In this respect these excavations resemble the more familiar structures on the surface. As build ings, however much as they may differ in appearance, are all built up of units, as walls, ?oors, windows and doors, so these underground workings are composed of groups of such units, as drifts, cross-cuts, stopes, raises, etc.
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