"The properties of The Shannon Copper Co., consisting of mine and smelter, are located in the Southeastern part of Arizona in what is known as the Clifton-Morenci District. The smelter is located at Clifton and the mine at Metcalf, eight miles distant on an iron capped mountain known as Serro Preito.
From a geological standpoint the ore deposits of the Clifton-Morenci District are a freak. There are no fissure veins of any consequence in the district; all the large deposits are found in bodies, the ore usually occurring in a soft porphyry.
Underlying the iron capping on the Shannon property the ground gives evidence of much disturbance, being cut with slips or faults that may run in any direction; also, in the same stope and with practically no difference in elevation, are found carbonate, oxide and sulphide ores. All the ore is found in bodies which have no definite shape and generally no walls, while some of the ore bodies are defined by one wall only, which evidences faulting at that point.
The system employed by the Shannon company in mining these ore bodies is that of square set, the object being to excavate all the ore in a body and completely fill the excavated portion with waste material in order to hold the ground in place. The material for filling is run into the stopes by chutes from open cuts on the surface, or by chutes from tunnels in which exporation work is being done"--page 1.
Mining and Nuclear Engineering
Professional Degree in Mining Engineering
Missouri School of Mines and Metallurgy
i, 13 pages, 7 plates
© 1908 R. E. Hoffman, All rights reserved.
Thesis - Open Access
Library of Congress Subject Headings
Mine timbering -- Design and construction
Shannon Copper Company
Print OCLC #
Electronic OCLC #
Link to Catalog Record
Hoffman, Ray Eugene, "Square set system of timbering as employed by the Shannon Copper Co." (1908). Professional Degree Theses. 135.