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By J. B. Carman

This paper, describing the concentrator of the Molybdenum Corporation of America in Taos County, northern New Mexico. 7 miles east of Questa, is one of a series on milling methods being prepared for and published by the United States Bureau of Mines. The mine from which the ore comes is 1 1/4 miles from the mill, and produces about 40 tons of ore per day by the cut-and-fill method.3 The ore contains about 5 per cent of MoS2. The mill has a capacity of 50 tons of ore per day and utilizes flotation methods. Water is taken from Red River. Power is generated by a water wheel, or by a Diesel engine in times of water shortage during the winter. The mill is located close to the bottom of a canyon, in order to obtain maximum head or, the water wheel, and the flow of ore is therefore maintained partly by gravity and partly by an elevator and pumps. ORE TREATED The MoS2 content of the concentrator feed ranges from 4.5 to 7.5 biotite, fluorite, small amounts of rhodochrosite and calcite, and the minerals of the granodiorite country rock.

Jan 1, 1932

By W. M. Traver, A. M. Evans

"INTRODUCTION The Bureau of Mines undertook exploration in the Torlingua district, Texas, during June 1943, at a time when the demand for mercury for war industries was considerably more than the anticipated domestic production. In view of the impressive past production of the mines and the favorable geologic conditions in several underdeveloped areas in the district, the investigation was considered of immediate importance.Prior to initiation of the exploratory program, a preliminary examination of the district was made in August 1942 by A. B. Needham, an engineer of the Bureau of Mines. This examination was followed by a comprehensive geological study by the Federal Geological Survey 3/ and further investigation the Bureau of Mines."

Jan 1, 1947

By E. G. King

In continuation of the study of thermodynamic properties of the common interoxidic compounds of ferroalloy elements, this report gives the results of low-termperature heat-capacity measurements and entropy evaluations of the monotungstates of sodium, magnesium, and calcium. Previous reports4 5/ of this laboratory dealt with low-temperature heat capacities, entropies, and heats of formation of the sodium vanadates. Heat-capacity measurements of the monotungstates of sodium, magnesium, and calcium (Na2W04, MgW04, and CaW04) were conducted throughout the temperature range 51° to 298° K. The entropies at 298° K. were evaluated and then combined with entropy data for the elements and oxides to obtain entropies of formation. This information is an essential part of the data needed for thermodynamic appraisals of chemical reactions of these substances. No similar data for any tungstate are to be found in the literature.

Jan 1, 1961

By George C. Branner

This circular is concerned with eight nonferrous scrap metals as they generated, collected, prepared, and consumed in California. Brief reference also is included with respect to Nevada and Hawaii. Four of these scrap metals - copper, lead, aluminum, and zinc - are of major importance and make up about 95 percent of the total value, whereas the remaining four - antimony, magnesium, nickel, and tin - make up the remaining 5 percent. For convenience, the subject matter is divided into three parts, (1) Data with respect to the collection, preparation, and marketing practices that are common activities to all the nonferrous scrap metals; (2) separate discussions and statistical data with respect to each of the eight nonferrous scrap metals in California; and (3) data with respect to Nevada and Hawaii.

Jan 1, 1962

By J. D. Davis

The carbonizing properties of No. 2-bed coal from the Bartoy mine and No. 5- or Miller-bed coal from the Wilkeson-Miller mine, both at Wilkeson, Pierce County, Wash., were determined by the Bureau of Mines-American Gas Association (BM-AGA) method. Tests were made in the 13-inch retort at 500°, 600°, and 700° C. and in the 18¬inch retort at 800°, 900°, and 1,000° C. Fischer low-temperature and United States Steel Corporation high-temperature assays were made and the results compared with those of the BM-AGA tests at corresponding temperatures. Agglutinating and plastic properties were determined, and chemical and petrographic analyses were made. The No. 2 bed is 58.5 to 88.0 inches thick at three points sampled in the Bartoy mine. The coal is 98 percent bright and contains only a trace of fusain. A composite of three mine samples contained 13.8 percent ash. The washed sample, which was used in the tests described herein, contained 11.4 percent ash, 2.2 percent moisture, and 0.6 percent sulfur upon the as-carbonized basis and 68.4 percent fixed carbon upon the dry, mineral-matter-free basis. The heating value was 15,183 B. t.u. per pound upon the moist, mineral-matter-free basis. No. 2 therefore ranks as a high-volatile A coal and is very high in that, rank. The ash softens at 2,910° F. Except for its ash content, which is higher than the limit of 9.0 percent specified by the American Society for Testing Materials, No. 2 coal fulfills the requirements of a coking coal. It also is classed as extremely friable, the friability being 88.0 percent. The agglutinating index (7.6 for the 15 : 1 ratio of silicon carbide to coal) is high, and the plasticity as indicated by the Gieseler test (60 divisions per minute) is low for a high-volatile A coal.

Jan 1, 1942

By Stephen A. Swan

Bureau of Mines researchers have collected and evaluated rollover protective structures (ROPS) f or more than 10 yr. ROPS and falling object protective structures (FOPS) are required on specified mining machines under regulations of the Mine Health and Safety Administration (MSHA). Both ROPS and FOPS are required on mining machines used in surface coal mines and surface areas of underground coal mines (30 CFR 77.403 and 7 7.4 13a), and ROPS are required on mining machines used in metal and nonmetal mining operations (30 CFR 55, 56, and 57.9-88). This illustrated manual provides mine safety personnel, MSHA inspectors, and original-equipment manufacturers with guidelines and a check- list for inspecting ROPS being used in the field. The manual discusses specific requirements of the MSHA regulations and minimum inspection and maintenance checks for ensuring compliance with those regulations. An easily reproducible checklist is provided as an aid to the inspection of ROPS.

Jan 1, 1985

By H. R. Shell, John L. Miller, M. V. Denny

In the mica research program conducted by the Bureau of Mines at Norris , Tenn . , many micas other than silicon fluorphlogopite have been synthesized . It has been well established since the initiation of the program that synthetic micas are important materials useful for their superior or unique properties as well as substitutes for natural micas . The possibility of controlling the physical properties of synthetic mica by isomorphic substitution of other ions in the fluorphlogopite lattice further emphasizes the importance of these materials . Accurate measurement and reporting of their properties constitute an essential part of the research program . The study of germanium fluorphlogopite is in keeping with the requirements of a comprehensive study on isomorphic substitution , specifically to identify precisely the material -- chemically , structurally , and optically . The X- ray measurements , including indexed powder and single crystal data , with a description of the methods used to obtain these data , are provided . 5 Earlier work on germanium mica by R. A. Hatch et al . (5) gave an estimate of the cell parameters from X - ray powder data , but no attempt was made to index the diffraction pattern or to determine the space group symmetry . Later work by E. A. Schatz and J. C. Withers (9) listed X- ray and optical measurements , but no attempt was made to index the mica or determine its symmetry . Roth (7) found that germanium dioxide having the a - quartz structure , when heated with equimolar percentages of MgO , CaO , Sr0 , or Ba0 at 1,235 ° C , formed ABO3 -type compounds , e.g. MgGe03 isostructural with enstatite (MgSiO3 ) . Geo₂ also has a rutile - type polymorph with Ge ++ ions in octahedral coordination . Germanium was substituted for silicon in the serpentine structure by Roy and Roy (8 ) using hydrothermal techniques . These authors wrote as follows : "The substitution of Ge + for Si + yielded a magnesia - germania serpentine , formed easily in euhedral hexagonal plates which in some instances were visible in the light microscope . Electron micrographs and the sharp X - ray diffraction patterns confirm a plate - like rather than tubular habit . " It has been shown in this investigation that substitution of germanium for silicon in the mica structure is readily accomplished without radically changing the characteristics of the mica . Substitutions in the mica structure take place in three locations : Tetrahedral , octahedral , and interlayer positions . The tetrahedral positions are normally occupied by Sit or by a combination of Sit with Al +3 the most common combination being 2A1 +3 and 6Si +4 · , The octahedral position , which has six - fold coordination in phlogopite , contains a larger cation such as magnesium . In muscovite it contains only 2A1 ions ; therefore , this mica is considered a dioctahedral mica , whereas phlogopite is considered trioctahedral . +3 The interlayer position has twelve - fold coordination with six oxygen ions from each of two adjacent tetrahedral silica layers . This is the cleavage plane of the mica and commonly contains the largest cation in the mica structure (e.g. potassium) .

Jan 1, 1964

Real gross national product increased at a larger-than- expected annual rate of 8.3 percent in the first quarter of 1984, with both consumption and investment spending increasing significantly in real terms (table 1). Residential and nonresidential fixed investment increased at annual rates of 25.7 and 14.6 percent during the first quarter of 1984, and investment in nonresidential structures, which declined in 1983, also increased during the first quarter of 1984, nearly attaining its 1982 level. The annual level of personal savings increased $27.7 billion, while the personal savings rate (the ratio of personal savings to disposable income) increased to 5.8 percent during the first quarter. The increase in the personal savings rate comes as welcome news to analysts concerned over the flow of loanable funds to the private sector and the impact on interest rates in 1984 of increased private and Government demands. U.S. Minerals Industry Performance A major upswing in the performance of the metal mining sector occurred during the first quarter of 1984, with production increasing almost 11.2 percent from January to March, The recovery of the metal sector is also reflected in the performance of primary metal industry profits, which were positive during fourth quarter 1983 following seven consecutive quarterly losses (table 1). Two thousand nine hundred more metal mining production workers were employed in February 1984 than in February 1983.

Jan 1, 1984

By William R. Barton

Dimension stones, with their almost infinite variety, have a broad range of properties and uses. Natural stone was beyond doubt the first mineral commodity used by man. Today dimension stone has widened to encompass building exteriors and interiors, decorative and ornamental modes, statuary, monuments, paving, curbing, flagging, roofing, and miscellaneous categories such as blackboards, surface plates, and honestones. For many purposes, it competes with greater or less success with alternate materials such as concrete, metal, brick, plastic, or glass. The almost ubiquitous geographic distribution of stone resources is the basis for a dimension stone producer industry in almost every State and in almost every land. In the United States, alone, dimension stone sold or used by quarries is valued at 2 million to 3 million dollars annually. Mining, finishing, transportation, and use technology have been modernized, resulting in a broader spectrum of stone products and new adaptions in use. Increased efficiencies also have been reflected in costs and prices and, coupled with gains that should be realized from current research, auger well for continued vitality of the ancient and honorable dimension stone craft.

Jan 1, 1968

By John C. Edwards

Several experimental programs were conducted at the Pittsburgh Research Center to investigate the level of mine fire detection and alarm capability possible using state-of-the-art technology. These programs involved comparison of the response and alarm time of optical and ionization type smoke sensors to smoldering and flaming coal combustion in a smoke chamber. Coal combustion experiments conducted in the smoke chamber demonstrated that a CO concentration of 5 ppm above ambient corresponded to an optical density of 0.022m1. For the four smoke sensors for which a continuous analog signal was available, a smoke sensor alarm was defined as the average background signal plus ten times the peak-to-peak noise. This alarm criterion resulted in the association of the alarm for three of the four sensors with a smoke optical density of 0.022m-1. and 0.033m-1 for the fourth smoke sensor. The smoke sensors used in the smoke chamber studies were incorporated into large scale diesel fuel fire experiments conducted under normal ventilation conditions in the Safety Research Coal Mine (SRCM) at the Pittsburgh Research Center. These experiments showed that a diffusion mode smoke sensor alarmed earlier than a diffusion mode CO sensor; and, based upon the measurement of the optical transmission at the location of a pump mode ionization type smoke sensor that a pump mode ionization smoke sensor alarmed at an average smoke optical density of 0.021m" for the twelve experiments conducted. A series of 30 and 330 kW diesel fuel fire intensity experiments were conducted under zero airflow conditions in the SRCM. It was determined that :(I) thermal sensors are inadequate at 30 m from a 300 kW fire;(2) a diffusion mode ionization smoke sensor can be more effective for mine fire detection than a diffusion mode CO sensor;(3) recommendations can be made for sensor spacing in a mine entry based upon the measured CO buoyancy induced spread rates along the mine roof and the time for a developing coal fire to ignite a conveyor belt.

By Chas. F. Jackson

The mining literature is replete with descriptions of methods and costs of operation at producing mines. To day the mine manager can find published information bearing upon almost any problem with which he may be faced. From this literature he can familiarize himself with methods employed by otter operators for coping with problems similar to his own, under more or less parallel conditions. Transaction of mining societies, publications of the U. S. Bureau of Mines, technical journals, and handbooks all afford valuable information dealing with operating methods and costs, Very little has been published, however, regarding methods and costs of equipping and developing new properties and bringing them to tae productive stage. There may be some question in the minds of many as to the value of papers on this subject, due to the great variety of conditions encountered. No two prospects are alike. Obviously, it is impossible to forecast what expenditure will be required to develop a mine from a raw prospect or even to predict whether the prospect can be developed into a productive mine.

Jan 1, 1933

After a stagnant performance in 1982, gross national product (GNP), industrial production, and employment increased during 1983 in nearly all industrial nations, with the U.S. performance generally leading the uneven worldwide recovery. Real U.S. GNP increased 3.3 percent in 1983 (table I). Although investment in nonresidential structures declined, total nonresidential fixed investment in the United States was up 1.5 percent following a 1982 decrease. The increase in worldwide industrial activity and demand in 1983 put greater pressure on prices in many countries. Prices increased from less than 3 percent in the Federal Republic of Germany, Japan, the Nether-lands, and Switzerland to as much as 10 percent in nearly all the other Organization for Economic Cooperation and Development nations. The annual inflation rate in the United States was 4.3 percent (based on the GNP fixed-weight price index).

Jan 1, 1984

By J. W. Thompson

AN ACT prescribing the mode of maintaining and defending possessory actions on lands belonging to the United States. The People, etc. SEC. 1. Any person now occupying and settled upon, or who may hereafter occupy and settle upon any of the public lands belonging to the United States, unoccupied, except upon lands containing mines of any of the precious metals, may commence and maintain any action for interference with, or injuries done to his possession of said land, against any person or persons so interfering with or injuring such land or such possession. SEC. 2. On the trial of any such cause, the possession or possessory right of the plaintiff shall be considered as extending to the boundaries embraced by the claim of such plaintiff, so as to enable him to have and maintain any action as aforesaid, without being compelled to prove an actual inclosure; provided, that such "claim" shall not exceed in any case one hundred and sixty acres of land. SEC. 3. Every such claim, to entitle the holder to maintain any action as aforesaid, shall be marked out, so that the boundaries thereof may be readily traced, and the extent of such "claim" easily known, and no person shall be entitled to maintain any such action for possession of, or injury to, any claim, unless he occupy the same, or shall have made improvements thereon to the value of $100. SEC. 4. A neglect to occupy or cultivate such "claim," for the period of three months, shall be considered such an abandonment as to preclude the claimant from maintaining any action as hereinbefore mentioned. Sec. 5. Any person or persons claiming the right of possession to land under this act shall have the right to defend said possession and the claim thereto, and all the rights and privileges given them by this act.

Jan 1, 1918

By C. E. Wicks, F. E. Block, F. D. Stevenson

The vapor pressures of tungsten (VI ) chloride ( WC1 ) and hafnium ( IV ) iodide ( HFI ) were measured by a metal diaphragm technique . Vapor pressure values were obtained to permit calculation of the thermodynamic properties of the vaporization processes of the compounds . The vapor pressure data of WC16 are represented by the following equations for the liquid , B - solid , and a- solid over the temperature intervals indicated : - log P = 8.194 3,253 /T Liquid , 281.5 ° to 325 ° C : B - solid 230.0 ° to 281.5 ° C : log P a - solid 185.0 ° to 230.0 ° C : log Pam *** = 8.794 - 3,588 / T = 9.615 - 3,996 /T where T is the absolute temperature in degrees Kelvin . The heats of vaporization and sublimation are 14.9 , 16.4 , and 18.3 kcal / g mole , respectively . The entropy of vaporization at the normal boiling point , 330 ° C , was 24.3 eu . The fusion temperature , 281.5 ° C , and transition temperatures , 230.0 ° and 185 ° C , were found by thermal analysis .

Jan 1, 1964

By Joel N. Van Sant

An investigation was conducted to study possible sources of Utah refractory and structural clays that could be used for the manufacture of refractories and light or buff burning heavy-clay products. A field study was made and the clay samples tested to determine their firing characteristics. Results of the Bureau's work indicate many small noncommercial deposits of hypogenic clay occur in igneous rocks. Commercial hypogenic deposits are mostly halloysite clay developed by hydrothermal replacement of limestone. The high firing shrinkage of halloysite precludes its use as a refractory, however, halloysite produced at the Dragon Mine south of Eureka, is used fur making oil catalysts. Clays and shales suitable for low heat duty refractory products are found in the Manning Canyon shale, in shales associated with coal bearing rocks, and in the Dakota formation. Some of the clays from the Dakota formation are also suitable for high-duty refractory products.

Jan 1, 1964

By O. C. Blade

This report on the properties of motor fuels sold through service stations in the United States is a continuation of a series of reports made in accordance with a cooperative agreement between the Coordinating Fuel Research ( C.F.R. ) Committee of the Coordinating Research Council ( C.R.C. ) and the Bureau of lines of the United States Department of the Interior . The first of these reports presented data on motor gasolines sold during the winter of 1935-35.4/ Further reports have been issued describing motor gasolines sold during the succeeding summers and winters to and including the summer of 1941.5/ No reports were made on motor gasolines sold during the winter of 1941-42 and during the summer of 1942 . However , starting with the winter of 1942-43 , the semi - annual reports have been resumed

Jan 1, 1945

By C. M. Harrer

The location, features, qualities, and extent of iron occurrences and the associated resources--limestone and dolomite, bentonite, coal-lignite, petroleum and natural gas, power, and water--are evaluated. The results of pioneer beneficiation tests on South Dakota taconite are discussed. In addition, pertinent features of taconite development, cost factors, the Western and Central United States trade area and markets are reported. The State's production of iron ores until 1963 has been small and for purposes other than the manufacture of iron. This investigation disclosed the probability of large resources of taconite in Pennington and Lawrence Counties. The average iron content is 29 percent, and a 65-percent or better iron concentrate might be produced. Ample resources are available for mining and processing taconite. An investment of at least $26 million would be required for a plant capable of turning out 1 million tons of agglomerated iron concentrate per year. The feasibility of such an enterprise is indicated, but intensive investigation and research must be completed to justify such an investment,

Jan 1, 1966

By R. V. Lundquist, H. Leitch

The solubility characteristics of three calcium aluminates , 12Ca0 · 7A120½ 3Ca0 A1203 , and 4Ca0 A12 03 Fe2O3 , were determined in water and in solutions of NaOH and Na₂ CO₂ to more clearly define their role in relation to the recovery of aluminum by the lime sinter and the lime - soda sinter processes . The calcium aluminates were prepared by sintering stoichiometric mixtures of CaCO3 , Al2O3 3H20, and Fe 0 at 1,375 ° C. The rates and extent of aluminum extractions were determined . The aluminum extractions from the aluminates were dependent on the presence of carbonate ions in the leach solutions , temperature , time , leach solution composition , and solid - liquid ratio of the slurry . The aluminum extracted from the calcium aluminates in water and in NaOH solutions varied from 4.6 to 22.9 percent . Virtually , complete extraction could generally be obtained for 12Ca0.7A120 and 4Ca0.A12 03 • Fe₂ 03 ; in one instance it was obtained for 3Ca0.A1203 , when an excess of carbonate ions was present over that required for the conversion of all of the calcium in the aluminates into CaCO3 . In some cases of poor aluminum recoveries , extractions could be improved by regrinding and releaching the solid residues .

Jan 1, 1964

By Frederick C. Kohout

An advanced water-in-oil emulsion hydraulic fluid has been developed which meets defined laboratory performance criteria and which has given fully satisfactory results in a one-year underground mine test in two continuous miners. A novel method of monitoring fluid water content was demonstrated and incorporated into a test kit for use at or near the mine site. Test fluid fire resistance integrity as measured by the MSHA Schedule 30 procedure was maintained during the test and important fire resistance test variables identified.

Jan 1, 1979

By Steven A. Fechner

In 1991 and 1992, the Bureau of Mines completed chromium, platinum-group metals (PGM), and tin investigations, and started indium, manganese, titanium, and vanadium investigations in Alaska. These studies were done as part of the Site Specific Minerals Investigations project. As a result of this work, the Bureau found PGM-bearing composite plutons in the Yentna River area of the Alaska Range, which are chemically similar to composite plutons in other parts of the Alaska Range and to Ural-Alaskan type complexes. Previously unknown chromium and PGM occurrences were found in the western Brooks Range. A compilation report on the Bureau's chromium and PGM investigations in the western Brooks Range was also published. Indium was found in anomalous concentrations at the Lost River tin deposit. Small occurrences of manganese were located, mapped, and sampled in the Wiseman and Chandalar quadrangles, and in the Liberty Falls, Prince William Sound, and Homer areas. Tin occurrences in western Alaska were summarized in three Bureau open file reports. The beaches near Cape Yakataga and Yakutat were evaluated for their titanium potential and a sampling methodology was developed. Vanadium investigations included examining streams in the Wiseman and Eagle areas that contained anomalous vanadium values. In the Eagle area, high vanadium, uranium, and copper values were found in the basal layers of the Road River formation.

Jan 1, 1994