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OFR-114-80 An Illumination System For A Shortwall Mining Section
By Robert A. Harrow
This report documents the results of the development and installation of an illumination system for an underground coal mine Shortwall Mining Section. Also presented are the techniques used for the ab
Jan 1, 1979
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Detrimental Effects Of Capacitance On High-Resistance-Grounded Mine Distribution Systems
By Thomas Novak, Jeffrey L. Kohler, Joseph Sottile, Steve J. Gnapragasam
Modern underground coal mines can be very large, having a total connected load in excess of l5 000 hp. These mines generally have many miles of high-power conveyor belts and 15 or more miles of high-v
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Mineral Resources Of The Raymond Peak Rare II Area (No. 4985), Alpine County, California - Summary
By Francis E. Federspiel
Silver and gold are the principal metals in the study area; they occur in quartz veins or silicified portions of shear zones. In some deposits, lead, antimony, zinc, and molybdenum are associated with
Jan 1, 1981
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RI 5166 Estimate Of Known Recoverable Reserves Of Coking Coal In Clearfield County, Pa. ? Conclusions
By D. W. Blaylock
1. The Lower Freeport and Lower Kittanning beds are the most important beds in Clearfield County, Pa., from the standpoint of production. The Lower Kittanning bed has the largest remaining recoverable
Jan 1, 1955
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IC 9288 A Laser Based Continuous Miner Guidance System
By Donna L. Anderson
This information circular documents the status of a laser-based guidance system to track and control the tramming maneuvers of a continuous mining machine. The work is part of a multiple project effor
Jan 1, 1991
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RI 6164 Design And Development Of Precast Concrete Mine Supports: A Progress Report ? Summary
By G. T. Krempasky
In an attempt to develop a suitable precast concrete support for underground use, two different models (1955 and 1958) of a five-piece concrete set were designed, fabricated, and tested under adverse
Jan 1, 1963
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RI 3253 Analyses Of Crude Oils From Some Fields Of Southern Louisiana
By A. J. Kraemer
For a number of years the Bureau of Mines has been conducting an investi-gation of crude petroleum from producing fields in the United States and the Western Hemisphere and has published a series of r
Jan 1, 1934
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RI 7567 Influence Of Thermal Treatments Upon Grindability Of Low-Grade Nonmagnetic Iron Ores
By R. A. Vik
The influence of thermal treatments on the grindability of low-grade hematitic iron ores from Michigan and Minnesota was examined in bench-scale tests. Treatment factors were roasting temperature, roa
Jan 1, 1971
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RI 4137 Concentration of Carbonate and Oxide Manganese Ores from the Vicinity of Tracy, Central California
By B. K. Shibler, K. C. Vincent, W. W. Agey
"INTRODUCTION As a part of the investigation of domestic manganese deposits, examining engineers of the Bureau of Mines collected samples of ore from three from three properties in the general vicinit
Nov 1, 1947
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IC 9503 - Explosion Hazards From Methane Emissions Related To Geologic Features In Coal Mines
By James P. Ulery
Explosions in U.S. coal mines have caused death and injury to miners and destruction of workings since the first reported explosion in 1810. These explosions are caused when buildups of explosive gas
Jan 4, 2008
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RI 5952 Computing Ore Reserves By The Polygonal Method Using A Medium-Size Digital Computer ? Summary And Introduction
By Richard F. Hewlett
Engineers at the Bureau of Mines Denver Mining Research Center have been a research program investigating the theory and application of mine sampling. Part of this program is an investigation of the e
Jan 1, 1962
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RI 5457 Communication Of Flame Through Cylindrical Channels ? Summary
By H. G. Wolfhard
The propagation of explosions through short cylindrical channels has been investigated by the Bureau of Mines. In the experimental apparatus set up by the Bureau, a single such channel formed a connec
Jan 1, 1959
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Design Of Underground Openings In Competent Rock - Summary
By Leonard Obert
THIS REPORT presents methods and principles useful in designing underground mine openings and pillars in competent rock formations. Two types of formations are considered: (1) Massive formations, in w
Jan 1, 1960
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MLA 75-86 - Mineral Resources Of The King Hill Creek Study Area, Elmore County, Idaho ? Summary
By Andrew M. Leszcykowski
In 1985 at the request of the Bureau of Land Management, personnel from the U.S. Bureau of Mines examined a 27,680-acre portion of the 30,420-acre King Hill Creek Wilderness Study Area (10-19-2) in or
Jan 1, 1986
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OFR-8-86 Bag Machine Dust Controls And Bag Sealing
By T. L. Muldoon
The bagging of dry pulverized products using fluidized air packers creates severe respirable dust problems in many surface mining operations. During bag filling, excess air and product blows by the ba
Jan 1, 1985
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RI 7709 Adhesion At Crystalline Interfaces In Rock
By George A. Savanick
The objective of this research is to develop a method for measuring the tensile strength at the interface between minerals in rock. These measurements reflect the strength of the attractive forces ope
Jan 1, 1972
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RI 3570 Progress Reports - Metallurgical Division - 47. Mineral Physics Studies - Ferromagnetic Properties Of Hematite
By Earl T. Hayes
[This work represent a continuation of the efforts of the Metallurgical Division of the Bureau of Mines to ascertain and apply knowledge of miner physics to processes metallurgy.]
Jan 1, 1941
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RI 3505 Relationship Of Ash-Fusion Temperatures Of Coal And Coke ? Introduction (6f500829-9d2d-49ca-b0c0-4315af1a4067)
By D. A. Reynolds
A few studies on the relationship of the fusion temperature of the ash on coke to that of the corresponding coal have been made on commercial high-temperature cokes. H. J. Rose3/ in 1921 compared the
Jan 1, 1940
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RI 3570 Progress Reports - Metallurgical Division - 47. Mineral Physics Studies - Ferromagnetic Properties Of Hematite (035889a3-e932-4cbe-9475-4b4b8cdd15fa)
By Earl T. Hayes
[This work represents a continuation of the efforts of the Metallurgical Division of the Bureau of Mines to ascertain and apply knowledge of mineral physics to process metallurgy.]
Jan 1, 1941
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OFR-14-76 Data Flow Requirements For Remote Supervisory Control Of Continuous Mining Machines - I. Introduction - A. Summary - 1. Objective
By Harvey L. Pastan
The purpose of the investigation and analysis described in this report is to assess the data flow requirements that are required for remote supervisory control of a continuous mining system. Since the
Jan 1, 1975