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Books Bücher 1 - 9 von 9 in The points of observation and measurement are so closely spaced, and the thickness...
" The points of observation and measurement are so closely spaced, and the thickness and extent of the coal are so well defined that the computed tonnage is judged to be accurate within 20 per cent or less of the true tonnage. "
Geological Survey Bulletin - Seite A-20
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U.S. Geological Survey Professional Paper

1963
...well defined that computed tonnage is considered to be within 20 percent of true tonnage. Although spacing of points of observation necessary to demonstrate...continuity of coal varies in different regions according to character of the coal beds and geologic structure, points of observation are, in general, about half...
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Coal Resources of Beaver County, Pennsylvania, Ausgabe 1143

Elmer Davisson Patterson - 1963 - 33 Seiten
...and the thickness and extent of the coal so well defined that computed tonnage is considered to be within 20 percent of the true tonnage. Although the...partly from specific measurements and partly from assumptions based on available data and on geologic evidence. In general, the points of coal measurement...
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Geological Survey Circular, Ausgaben 361-370

Geological Survey (U.S.) - 1955
...thickness and extent of the coal so well defined that the computed tonnage may be considered to be within 20 percent of the true tonnage. Although the...regions according to the character of the coal beds, geologic structure conditions, and other factors, the points of observation are, in general, about...
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Geology of the Johnson Creek Quadrangle, Caribou County, Idaho, Ausgabe 1042

Robert Allen Gulbrandsen - 1956 - 23 Seiten
...the coal so well defined that the computed tonnage may be considered to be within 20 percent or less of the true tonnage. Although the spacing of points...regions according to the character of the coal beds, structural conditions, and other factors, the points of observation are in general less than half a...
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Coal Reserves of the United States: A Progress Report ..., Ausgaben 1135-1136

Paul Averitt - 1961 - 116 Seiten
...the estimates. These classes are termed "measured," "indicated," and "inferred." MK vsrilEU RESERVES of observation necessary to demonstrate continuity...different regions according to the character of the coalbeds, the points of observation are, in general, about half a mile apart. INDICATED RESERVES Indicated...
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Fuel Reserves of the United States: A Statement Prepared at the Request of ...

Geological Survey (U.S.), United States. Congress. Senate. Committee on Interior and Insular Affairs - 1951 - 49 Seiten
...is judged to be accurate within 20 percent or less of the true tonnage. Although the spacing of the points of observation necessary to demonstrate continuity...coal varies in different regions according to the habit of the coal beds, the points of observation are, in general, of the order of one-half mile apart....
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Resources for Freedom: A Report to the President, Teile 1-5

United States. President's Materials Policy Commission - 1952 - 407 Seiten
...is judged to be accurate within 20 percent or less of the true tonnage. Although the spacing of the points of observation necessary to demonstrate continuity...regions according to the character of the coal beds, the points of observation are, in general, about half a mile apart. Indicated coal is coal for which...
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The Foreign Market Potential for United States Coal, Band 1

Robert R. Nathan Associates - 1963
...is judged to be accurate within 20 percent or less of the true tonnage. Although the spacing of the points of observation necessary to demonstrate continuity...different regions according to the character of the coalbeds, the points of observation are, in general, about half a mile apart. INDICATED RESERVES Indicated...
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Air Pollution and the Regulated Electric Power and Natural Gas Industries ...

United States. Federal Power Commission - 1968 - 366 Seiten
...tonnage is judged to be accurate within 20 percent of the true tonnage. Although the spacing of the points of observation necessary to demonstrate continuity...different regions according to the- character of the coalbeds, the points of observation are, in general, about half a mile apart. Indicated Reserves Indicated...
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