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Presented as Thesis (Ph. D.)--University of Wisconsin--Madison, 1911. / Cover title. Reprinted from Economic geology, vol. VII, no. 1 (Jan. 1912). Includes bibliographical references.

Thesis (Professional Degree)--University of Missouri, School of Mines and Metallurgy, 1925. / The entire thesis text is included in file. Typescript. Title from title screen of thesis/dissertation PDF file (viewed October 9, 2009) Includes bibliographical references (p. 26).

Thesis--University of Wisconsin. / Reprint of Bulletin no. 5 of The Mining Bureau of the Philippine Islands. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

The Ruth-Hope and Silversmith areas are mainly underlain by structurally-competent quartzites, sandy limestones, and thick argillites. Bedding attitudes are steep; several major and minor recumbent folds occur within the local section of bedding structures. The strong northeasterly-trending Standard-Silversmith lode system is represented locally by the Hope, New Ruth, and Silversmith lodes. The Old Ruth-Stewart section lies about one-half mile north, and in the footwall of the main belt. Lodes strike easterly to northeasterly across the trend of bedding structures; they dip to the southeast at moderate to high angles. The most important ore minerals are argentiferous galena, sphalerite, and grey copper. The major bedding structure of the Old Ruth-Stewart section is a recumbent anticline which is convex to the southwest. Bedding within the New Ruth-West Silversmith section dips moderately to steeply southwest. The pattern of lode and cross-fault displacements is reasonably consistent within the mines area. From evidence provided by minor structures, the relative displacements were such that lode hanging walls moved downward to the east and southeast; normal displacements occurred on all cross-faults. Within the productive part of the Old Ruth Mine, mineralization apparently followed a late normal displacement within a major strand of the lode. Lode movements, at least later ones, were, to some extent, transmitted by cross-faults which join the offset segments of the lodes. Also, to a minor extent, the cross-faults contain ore minerals which probably entered by way of fault-lode linking fractures. Apparently porphyry, alteration, and ore were emplaced consecutively, but concurrently with displacements on the lodes and cross-faults. The stronger mineralization of the northeasterly-trending fractures was probably due to a close timing of ore deposition with more intense late movements on this set of fractures. In addition, deeper "ore channels" could be expected within fractures which cross-cut, rather than parallel the bedding. That the West Silversmith porphyry "plug" was emplaced as a separate body, and is not a faulted block from the main Silversmith Stock was proved by the study of flow structures within the "plug". / Science, Faculty of / Earth, Ocean and Atmospheric Sciences, Department of / Graduate

One of the more elusive problems in the area of mineral resource assessment is the comprehensive description of potential supply from undiscovered deposits, especially for economic conditions outside of historical experience. This dissertation consists of the design of a Monte Carlo simulation system to estimate potential supply of roll-type deposits. The system takes a given uranium endowment probability distribution and aims at two major and interrelated objectives. First, to design a system that estimates potential supply even when prices are much higher than previous or current prices. Second, to account fully for the cost of discovering and mining the individual mineral deposits contained in given endowment. Achievement of these objectives constitutes the major contribution of this study. To accomplish them, the system considers: cost of risk, return on investment, cost of failures during the search process, discovery depletion, and effect of physical characteristics of the deposits on exploration and mining costs. It also considers that when economic conditions, such as product price, are outside historical experience, existing behavioral rules--exploration drilling density, stopping rules, minimum attractive deposit size and grade, and mining parameters--are irrelevant. Instead, those decision rules are determined internally by the system. The system design task--particularly the exploration model--is greatly compounded by these objectives. As far as can be determined from models reported in published papers, the exploration model of this dissertation is unique in several ways. It is the most disaggregated sequential model designed to date. It is the first one that models geologic features that are used as exploration guides, and the only one that separates the physical elements of the search process from the economic elements and links the two to decide the optimal activity level at every exploration stage. Although the system is designed for a specific mineral and mode of occurrence, the system architecture is general and can be used with an exploration model prepared specifically for other minerals.

D.Sc. / Please refer to full text to view abstract

Thesis (B.S.)--University of Missouri, School of Mines and Metallurgy, 1916. / The entire thesis text is included in file. Typescript. Illustrated by author. Title from title screen of thesis/dissertation PDF file (viewed April 1, 2009) Includes bibliographical references (p. 20).

Thesis (B.S.)--University of Missouri, School of Mines and Metallurgy, 1914. / The entire thesis text is included in file. Typescript. Illustrated by author. Title from title screen of thesis/dissertation PDF file (viewed April 7, 2009) Includes bibliographical references (p. 30).

From introduction: This dissertation aims to review the main aspects involved in mine planning, in order to provide the geologists with the main criteria to obtain a preliminary estimate of the minability of an in situ orebody, and to make the geologists aware of the information they can contribute to the planning engineers. Furthermore, an understanding of the basic principles behind mine planning may help the exploration geologist to select more realistic targets of exploration.