Mineral Industry Surveys For information, contact: Robert L Virta, Iron Ore Commodity Specialist (acting) U.S. Geological Survey 989 National Center Reston, VA 20192 Telephone: (703) 648-7726, Fax: (703) 648-7757 E-mail: [email protected] Michelle B. Blackwell (Data) Telephone: (703) 648-7943 Fax: (703) 648-7975 E-mail: [email protected]
U.S. Department of the Interior June 2012 U.S. Geological Survey . Mineral Industry Surveys. For information, contact: Robert L. Virta, Iron Ore Commodity Specialist (acting)
The sources of data for the asbestos worksheet are the mineral statistics publications of the U.S. Bureau of Mines and the U.S. Geological Survey—Minerals Yearbook (MYB) and its …
Robert VIRTA, Physical scientist | Cited by 223 | of United States Geological Survey, Colorado (USGS) | Read 10 publications | Contact Robert VIRTA
The use of asbestos is one of the most controversial issues surrounding the industrial minerals industry. Its carcinogenic nature, an overall lack of knowledge of minimum safe exposure levels, its widespread use for more than 100 years, and the long latency for the development of lung cancer and mesothelioma are the main contributing factors to these …
2011 Minerals Yearbook U.S. Department of the Interior U.S. Geological Survey IRON ORE December 2013. IRON ORE—2011. ... (USGS) develops U.S. iron ... By Candice C. Tuck and Robert L. Virta . Domestic survey data and tables were prepared by Michelle B. Blackwell, statistical assistant, and the world production ...
When people think of talc, they often think of talcum and baby powder. However, these uses of talc are minor compared to its use in industrial manufacturing. The leading use of talc in the United States is in the production of ceramics, where it is a source of magnesium oxide, serves as a flux to reduce firing temperatures, and improves thermal shock characteristics of …
When people think of talc, they often think of talcum and baby powder. However, these uses of talc are minor compared to its use in industrial manufacturing. The leading use of talc in the United States is in the production of ceramics, where it is a source of magnesium oxide, serves as a flux to reduce firing temperatures, and improves thermal shock characteristics of the final …
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Talc and pyrophyllite by Robert L Virta 75 1 . 75-1 ... Ferromanganese fluorspar furnace Gemstones gold grade gross weight gypsum IMPORTS FOR CONSUMPTION Includes increased Industrial Minerals International Japan kilograms lead lime ... three significant digits totals shown U.S. Census Bureau U.S. Department U.S. Geological Survey U.S. IMPORTS ...
Clays were one of the first mineral commodities used by people. Clay pottery has been found in archeological sites that are 12,000 years old, and clay figurines have been found in sites that are even older....
This volume, covering metals and minerals, contains chapters on approximately 90 commodities. In addition, this volume has chapters on mining and quarrying trends and on statistical surveying methods used by Minerals Information, plus a statistical summary.
Volcanic rocks containing natural zeolites — hydrated aluminosilicate minerals that contain alkaline and alkaline-earth metals — have been mined worldwide for more than 1,000 years for use as cements and building stone. For centuries, people thought natural zeolites occurred only in small amounts inside cavities of volcanic rock. But in the 1950s and early 1960s, large zeolite …
(Industrial Minerals, 1999). In ceramics, wollastonite decreases shrinkage and gas evolution during firing, increases green and fired strength, maintains its brightness during firing, …
Publication type: Article: Publication Subtype: Journal Article: Title: 2013 Industrial Minerals Review: Ball Clay: Series title: Mining Engineering: Volume: 66
Mineral Commodity Profiles—Asbestos By Robert L. Virta Hodgson, 1986, p. 110). Chrysotile has been the most com-monly used form of asbestos, followed by crocidolite, amosite, and then …
These fibers belong to two mineral groups: serpentines and amphiboles. The serpentine group contains a single asbestiform variety: chrysotile; five asbestiform varieties of amphiboles are known: anthophyllite asbestos, grunerite asbestos (amo ... Robert L. Virta: Publication Type: Report: Publication Subtype: USGS Numbered Series: Series Title ...
The term asbestos is a generic designation referring usually to six types of naturally occurring mineral fibers that are or have been commercially exploited. These fibers belong to two mineral groups: serpentines and amphiboles. The serpentine group contains a single asbestiform variety: chrysotile; five asbestiform varieties of amphiboles are known: anthophyllite asbestos, …
Robert L. Virta: Publication Type: Article: Publication Subtype: Journal Article: Series Title: Mining Engineering: Index ID: 70102824: Record Source: USGS Publications Warehouse: USGS Organization: National Minerals Information Center: Contact. National Minerals Information Center 988 National Center 12201 Sunrise Valley Drive Reston, VA 20192 ...
By Robert L. Virta Circular 1298 U.S. Department of the Interior ... issues surrounding the industrial minerals industry. Its carci-nogenic nature, an overall lack of knowledge of minimum safe exposure levels, its widespread use for more than 100 years, ... Survey (USGS) Open-File Report 03–083, "Worldwide Asbes-
The article reports on the market performance of kaolin in the U.S. in 2009 and presents an outlook for its 2010 performance. There was a decline in the domestic sales of kaolin from 6.74 measurement ton (Mt) to 5.2 Mt. Companies in the country engaged in kaolin production include Advanced Primary Minerals Corp., Applied Minerals Inc., and Daleco Resources Corp.
Robert L. Virta: Publication Type: Article: Publication Subtype: Journal Article: Series Title: Earth: Index ID: 70044935: Record Source: USGS Publications Warehouse: USGS Organization: National Minerals Information Center: Contact. National Minerals Information Center 988 National Center 12201 Sunrise Valley Drive Reston, VA 20192
The article reports on the global market performance of ball clay in 2009 and presents an outlook for its 2010 performance. Several companies mined ball call in the country including Old Hickey Clay Co., Kentucky-Tennessee Clay Co., and H.C. Spinks Clay Co. Information on the decline in ball clay imports and exports is also presented....
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Mineral Commodity Profiles, Asbestos: Usgs Circular 1255-Kk [Virta, Robert L., U. S. Department of the Interior, United] on Amazon. *FREE* shipping on qualifying offers. …
The article discusses the characteristics and feature of asbestos. According to the author, asbestos is a generic name for six needle-shaped minerals that possess high tensile strengths, flexibility, and resistance to chemical and thermal degradation. These minerals are actinolite, amosite, anthophyllite, chrysolite, crocilodite and tremolite.
Robert L. Virta: Publication Type: Article: Publication Subtype: Journal Article: Series Title: Geotimes: Index ID: 70116803: Record Source: USGS Publications Warehouse: USGS Organization: National Minerals Information Center: Contact. National Minerals Information Center 988 National Center 12201 Sunrise Valley Drive Reston, VA 20192
Each chapter of the 2014 edition of the U.S. Geological Survey (USGS) Mineral Commodity Summaries (MCS) includes information on events, trends, and issues for each mineral commodity as well as discussions and tabular presentations on domestic industry structure, Government programs, tariffs, 5-year salient statistics, and world production and ...
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The term asbestos is a generic designation referring usually to six types of naturally occurring mineral fibers that are or have been commercially exploited. These fibers belong to …
U.S. Department of the Interior May 2012 U.S. Geological Survey . Mineral Industry Surveys. For information, contact: Robert L. Virta, Iron Ore Commodity Specialist (acting)
Clays represent one of the largest mineral commodities in the world in terms of mineral and rock production and use. Many people, however, do not recognize that clays are used in an amazingly wide variety of applications. Use continues to increase worldwide as populations and their associated needs increase. Robert Virta, clay and shale commodity specialist for the U.S. …
The article reports on the market performance of kaolin in the U.S. in 2009 and presents an outlook for its 2010 performance. There was a decline in the domestic sales of kaolin from 6.74 measurement ton (Mt) to 5.2 Mt. Companies in the country engaged in kaolin production include Advanced Primary Minerals Corp., Applied Minerals Inc., and Daleco …
The use of asbestos is one of the most controversial issues surrounding the industrial minerals industry. Its carcinogenic nature, an overall lack of knowledge of minimum safe exposure levels, its widespread use for more than 100 years, and the long latency for the development of lung cancer and mesothelioma are the main contributing factors to these controversies.
View or download the PDF (2 ).. Abstract. This Circular updates and supersedes U.S. Geological Survey (USGS) Open-File Report 03–083, "Worldwide Asbestos Supply and Consumption Trends from 1900 to 2000," with the addition of supply and consumption estimates and analysis from 2001 through 2003 and revisions to the consumption estimates for 1998 …
Mineral Industry Surveys. For information, contact: Robert L. Virta, Iron Ore Commodity Specialist (acting) U.S. Geological Survey . 989 National Center . Reston, VA 20192 . Telephone: (703) …
U.S. Department of the Interior April 2012 U.S. Geological Survey . Mineral Industry Surveys. For information, contact: Robert L. Virta, Iron Ore Commodity Specialist (acting)
Mineral Commodity Profiles -- Asbestos. Published 2005 Online only Version 1.0. By Robert L. Virta. Overview. Asbestos is a generic name given to six fibrous minerals that have been used …
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