Sinking a Large-Diameter Concrete-Lined Access Shaft: Harold D. Roberts Tunnel, Colorado

Sinking a Large-Diameter Concrete-Lined Access Shaft: Harold D. Roberts Tunnel, Colorado

Date: 1961
Creator: Bolmer, R. L.
Description: Report issued by the U.S. Bureau of Mines discussing sinking and excavation of large-diameter access shafts. As stated in the introduction, "this information circular describes the application of modern methods and equipment in sinking a vertical, 916-foot-deep by 16-foot-diameter, concrete-lined access shaft for the Harold D. Roberts tunnel near Montezuma, Colo." (p. 1). This report includes maps, tables, illustrations, and photographs.
Contributing Partner: UNT Libraries Government Documents Department
Effects of minimum quantity lubrication in drilling 1018 steel.

Effects of minimum quantity lubrication in drilling 1018 steel.

Date: December 2008
Creator: Shaikh, Vasim
Description: A common goal for industrial manufacturers is to create a safer working environment and reduce production costs. One common method to achieve this goal is to drastically reduce cutting fluid use in machining. Recent advances in machining technologies have made it possible to perform machining with minimum-quantity lubrication (MQL). Drilling takes a key position in the realization of MQL machining. In this study the effects of using MQL in drilling AISI 1018 steel with HSS tools using a vegetable based lubricant were investigated. A full factorial experiment was conducted and regression models were generated for both surface finish and hole size. Lower surface roughness and higher tool life were observed in the lowest speed and feed rate combination.
Contributing Partner: UNT Libraries
A Study of Numerically Controlled Machines

A Study of Numerically Controlled Machines

Date: August 1967
Creator: Chan, John C. H.
Description: This is a study of numerical control, its application, and the design of a numerical control program for a drilling machine. The study sought to obtain information on the function of numerical control; the different types of numerical control used by industry; and, the advantages of using numerical control.
Contributing Partner: UNT Libraries
Exploration of the Mount Hope Mine, Eureka County, Nevada

Exploration of the Mount Hope Mine, Eureka County, Nevada

Date: August 1946
Creator: Matson, E. J.
Description: Report issued by the U.S. Bureau of Mines on the exploration of the Mount Hope mine. Analysis of samples obtained from core-drilling are listed. This report includes tables, maps, and illustrations.
Contributing Partner: UNT Libraries Government Documents Department
Diamond Drilling at the Boston Consolidated Copper Mine, Salt Lake County, Utah

Diamond Drilling at the Boston Consolidated Copper Mine, Salt Lake County, Utah

Date: November 1949
Creator: Jones, Robert L.
Description: Report issued by the Bureau of Mines over diamond-drilling projects in Salt Lake County. The geology, physical features, and history of the mines are presented. This report includes tables, maps, illustrations, and photographs.
Contributing Partner: UNT Libraries Government Documents Department
Investigation of the Young American Lead-Zinc Deposit, Stevens County, Washington

Investigation of the Young American Lead-Zinc Deposit, Stevens County, Washington

Date: November 1949
Creator: Hundhausen, Robert J.
Description: Report issued by the Bureau of Mines over investigations of mines in Stevens County, Washington. The history, geology, and physical features of the mines are presented. This report includes tables, maps, and illustrations.
Contributing Partner: UNT Libraries Government Documents Department
Drilling and Sampling Tertiary Gold-Bearing Gravels at Badger Hill, Nevada County, California

Drilling and Sampling Tertiary Gold-Bearing Gravels at Badger Hill, Nevada County, California

Date: 1974
Creator: McLellan, Russell R.
Description: Report issued by the Bureau of Mines over gold-bearing deposits of Nevada County, California. Drilling and sampling of these gold deposits are discussed. This report includes tables, maps, illustrations, and photographs.
Contributing Partner: UNT Libraries Government Documents Department
Investigation of the Blewett Zinc-Lead Deposit, Jo Daviess County, Illinois

Investigation of the Blewett Zinc-Lead Deposit, Jo Daviess County, Illinois

Date: September 1948
Creator: Holt, Stephen P.
Description: Report issued by the Bureau of Mines over studies conducted on the Blewett zinc-lead mine of Illinois. Samples obtained through churn-drill and diamond drill holes are analyzed. This report includes tables, maps, and illustrations.
Contributing Partner: UNT Libraries Government Documents Department
Investigation of Arkansas Bauxite

Investigation of Arkansas Bauxite

Date: March 1948
Creator: Malamphy, M. C.
Description: Report issued by the Bureau of Mines over exploratory work conducted on the bauxite deposits of Arkansas. Descriptions of geophysical characteristics and core drilling results are presented. This report includes tables, maps, illustrations, and photographs.
Contributing Partner: UNT Libraries Government Documents Department
Core-Drilling Testing for Base-Metal Mineralization Below the Hope Silver Mines, Granite County, Montana

Core-Drilling Testing for Base-Metal Mineralization Below the Hope Silver Mines, Granite County, Montana

Date: February 1949
Creator: Cole, John W.
Description: Report issued by the Bureau of Mines over base-metal testing conducted in Granite County, Montana. Descriptions of the deposits, geology, and the factual data obtained during testing are presented. This report includes tables, maps, and illustrations.
Contributing Partner: UNT Libraries Government Documents Department
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