Continued prospecting and mining in the Cave-In-Rock fluorspar district has developed data that permits a more detailed study of ore genesis of the district. The stratigraphy of the ore-bearing horizons is described with emphasis on the chemical and physical characteristics of the formations. The contact relationship between the host formation and the blanketing formation is discussed in detail because of its apparent role in the movement of solutions. The structure is defined in 3 categories on the basis of inducing forces or elements. The mineralogy and paragenesis discussions stress the occurrence and the depositional characteristics of the minerals. These factors permit the statement of a new theory of origin of the textural features of the ores. Two breccia pipes are described and are designated as the points at which mineralizing solutions rose from a deep source. The distribution of ore about these breccia pipes indicates that the solutions moved by simple hydraulic principles and provide a basis for the study of solution movement.

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