Technical Report Archive & Image Library (TRAIL) - 13 Matching Results
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- Analyses of Coals in the United States with Descriptions of Mine and Field Samples Collected between July 1, 1904 and June 30, 1910: Part 1. -- Analyses
- From Significance and value of Analyses of Coal: "The analyses published in this report cover samples of coal collected in many different parts of the country with unusual care by experiences men, in such manner as to make them representative of extensive beds of coal."
- Analyses of Coals in the United States with Descriptions of Mine and Field Samples Collected between July 1, 1904 and June 30, 1910 Part 2. Descriptions of Samples
- From Introduction: "This volume contains the descriptions of the samples whose analyses are published in the preceding volume, Part I of this bulletin. The descriptions have been compiled from the notebooks of the persons who collected the samples, have been condensed from accounts given in published reports of the United States Geological Survey, or have furnished by the collection themselves. Inasmuch as the descriptions represent the work of many persons during a period of six years, and inasmuch as they were recorded under widely differing conditions, they necessarily vary in fullness detail."
- Coal Deposit, Coal Creek District, Gunnison County Colorado: Reserves, Coking Properties, and Petrographic and Chemical Characteristics
- From Introduction: "A preliminary report of the work was published in April 1947, and this bulletin supplements Report of Investigations 4104 and describes the results of the entire investigation."
- Geology of the Quartz Creek Pegmatite District, Gunnison County, Colorado
- Report discussing the geology of the Quartz Creek pegmatite district of Gunnison County, Colorado. "The Quartz Creek pegmatite district includes an area of about 29 square miles in the vicinity of Quartz Creek in Gunnison County, Colorado. This area contains 1,803 pegmatites that are intruded into pre-Cambrian rocks."
- Geology of the Quartz Creek pegmatite district, Gunnison County, Colorado
- A report regarding the geology of the Quartz creek Pegmatite District, in Gunnison County, Colordao
- Investigation of Coal Deposits in the Coal Creek District, Gunnison County, Colorado: Progress Report 1
- Report issued by the Bureau of Mines on studies of coal deposits of the Coal Creek district. The physicality, geology, and characteristics of samples are listed. This report includes tables, and a map.
- Preliminary Results of Radiometric Reconnaissance of Parts of the Northwestern San Juan Mountains, Gunnison, Ouray, San Juan, San Miguel, and Dolores Counties, Colorado
- From abstract: A reconnaissance radiometric survey of parts of the northwestern San Juan Mountains has revealed the occurrence of uranium-bearing ores in several mining districts in Ouray and San Juan Counties, and the occurrence of thorium-bearing veins in southwestern Gunnison County.
- Radiometric Reconnaissance in the Garfield and Taylor Park Quadrangles, Chaffee and Gunnison Counties, Colorado
- Report discussing field work done between 1947 and 1951 for a reconnaissance radiometric survey of the Garfield and Taylor Park quadrangles of the Sawatch Range in Chaffee and Gunnison Counties of west-central Colorado.
- Reserves, Petrographic and Chemical Characteristics, and Carbonizing, Properties of Coal Occurring South of Dry Fork of Minnesota Creek, Gunnison County, Near Paonia, Colorado, and the Geology of the Area
- Report issued by the Bureau of Mines discussing the geology, chemical, and carbonizing properties of Gunnison County coal reserves in Colorado. Results and analyses of the investigations conducted on the coal reserves are presented in detail. This report includes tables, maps, illustrations, and photographs.
- Shorter Contributions to General Geology, 1941-42
- Preface: The author of this paper gives a thorough description of a complex of very unusual igneous rocks and associated hydrothermal deposits.
- Thorium and Rare-Earth Minerals in Powderhorn District, Gunnison County, Colorado
- From abstract: Thorium has been found since 1949 in at least 33 deposits in an area 6 miles wide and 20 miles long in the Powderhorn district, Gunnison County, Colo. The district is underlain largely by pre-Jurassic metamorphic and igneous rocks, most of which, if not all, are pre-Cambrian in age. These rocks are overlain by sandstone of the Morrison formation of Jurassic age, and by volcanic rocks of the Alboroto group and the Hinsdale formation of Miocene and of Pliocene(?) age, respectively.
- Thorium and rare earth minerals in the Powderhorn district, Gunnison County, Colorado
- "Thorium deposits were discovered in the Powderhorn district in 1949. This district has long been known for its occurrences of alkalic igneous rocks, of which the best known is the Iron Hill complex (Larsen, 1942). Some of these alkalic rocks contain titanium, barium, strontium, rare earths, thorium, and niobium in greater percentages than those of most igneous rocks. A study of the thorium deposits was undertaken to obtain more information on the geologic relation of minor elements, particularly rare earths, and thorium, to alkalic igneous rocks, and to evaluate the economic significance of the Thorium deposits."
- [Waterloo Gulch, Appendix I-C]
- The following appendix contains petrographic photomicrographs of uranium anomalies in Waterloo Gulch, Colorado.