Interpreting pan-concentrate analysis of stream sediments in geochemical exploration for gold
Richard Philip Fischer (compiler), Frederick S. Fisher
1968, Circular 592
A study of methods of collecting and processing samples to determine whether or not gold is present in areas of moderate size was undertaken in the northwestern part of the San Juan Mountains, Colo. As part of this study, 57 samples of pan concentrates were taken from streams draining three...
Frequency curves
H. C. Riggs
1968, Techniques of Water-Resources Investigations 04-A2
This manual describes graphical and mathematical procedures for preparing frequency curves from samples of hydrologic data. It also discusses the theory of frequency curves, compares advantages of graphical and mathematical fitting, suggests methods of describing graphically defined frequency curves analytically, and emphasizes the correct interpretations of a frequency curve....
Estimated use of water in the United States, 1965
Charles Murray
1968, Circular 556
Estimates of water use in the United States for 1965 indicate that an average of about 310 bgd (billion gallons per day) were withdrawn for public-supply, rural domestic and livestock, irrigation, and industrial (including thermoelectric power)uses--that is, about 1,600 gallons per capita per day. This represents an increase of 15...
Methods of measuring water levels in deep wells
M. S. Garber, F. C. Koopman
1968, Techniques of Water-Resources Investigations 08-A1
Accurate measurement of water levels deeper than 1,000 feet in wells requires specialized equipment. Corrections for stretch and thermal expansion of measuring tapes must be considered, and other measuring devices must be calibrated periodically. Bore-hole deviation corrections also must be made. Devices for recording fluctuation of fluid level usually require...
Lead, zinc, and silver deposits at Bowser Creek, McGrath A-2 quadrangle, Alaska
Bruce L. Reed, Raymond L. Elliott
1968, Circular 559
Geochemical anomalies and metalliferous deposits between Windy Fork and Post River, southern Alaska Range
Bruce L. Reed, Raymond L. Elliott
1968, Circular 569
Summary of floods in the United States during 1962
J.O. Rostvedt
1968, Water Supply Paper 1820
This report describes the most outstanding floods in the United Spates during 1962. The most damaging floods during the year occurred in February in southern Idaho and northern Nevada and Utah, and during the latter part of February and the early part of March in Kentucky and in the Cumberland...
Quality of surface waters of the United States, 1960 Parts 9-14, Colorado River basin to pacific slope basins in Oregon and lower Columbia river basin
S. K. Love
1968, Water Supply Paper 1745
Quality of surface waters of the United States, 1960 parts 3 and 4, Ohio River Basin and St. Lawrence River basin
S. K. Love
1968, Water Supply Paper 1742
Tertiary gold-bearing channel gravel in northern Nevada County, California
D. W. Peterson, Warren E. Yeend, H. W. Oliver, Robert E. Mattick
1968, Circular 566
The remains of a huge Tertiary gravel-filled channel lie in the area between the South and Middle Yuba Rivers in northern Nevada County, Calif. The deposits in this channel were the site of some of the most productive hydraulic gold mines in California between the 1850's and 1884. The gravel...
Sedimentation in the Piru Creek watershed, southern California
Kevin M. Scott, John R. Ritter, J. M. Knott
1968, Water Supply Paper 1798-E
Geology and ground-water resources of the lower Bighorn Valley, Montana
Louis J. Hamilton, Q.F. Paulson
1968, Water Supply Paper 1876
The Bighorn River has incised a deep, broad valley in Cretaceous strata along its 65-mile lower reach below the mouth of Bighorn Canyon in south-central Montana. It ceased downcutting at six different levels 100-200 feet apart, widening its flood plain and alluviating each level with about 30 feet of sandy...
Geology and ground-water resources of the Deer Lodge Valley, Montana
Richard L. Konizeski, R. G. McMurtrey, Alex Brietkrietz
1968, Water Supply Paper 1862
The Deer Lodge Valley is a basin trending north-south within Powell, Deer Lodge, and Silver Bow Counties in west-central Montana, near the center of the Northern Rocky Mountains physiographic province. It trends northward between a group of relatively low, rounded mountains to the east and the higher, more rugged Flint...
Suggested areas for prospecting in the central Koyukuk River region, Alaska
Thomas Miller, Oscar J. Ferrians Jr.
1968, Circular 570
Preliminary materials map of the North Adams quadrangle, Massachusetts-Vermont
George William Holmes
1968, Open-File Report 68-133
No abstract available....
Mineral resources of the Appalachian region
Water Resources Division U.S. Geological Survey, U.S. Bureau of Mines
1968, Professional Paper 580
No abstract available....
Mineral reconnaissance of the Wadi al 'Aya quadrangle
Robert William Johnson Jr., Virgil A. Trent
1968, Open-File Report 68-151
List of references on the geology of Puerto Rico, 1866-1967
Marjorie Hooker
1968, Open-File Report 68-139
Bibliography of geology and geography of Ecuador
Roger B. Colton
1968, Open-File Report 68-62
Remote sensor imagery in urban research - some potentialities and problems
Eric Moore, Barry S. Wellar
1968, Open-File Report 68-187
Mineral reconnaissance of the Bir al Bayda' quadrangle, northwest Hijaz, Saudi Arabia
Robert William Johnson Jr., Virgil A. Trent
1968, Open-File Report 68-149
The Miocene Troublesome Formation in Middle Park, northwestern Colorado
Glen Arthur Izett
1968, Open-File Report 68-142
Gold gradients and anomalies in the Pedro Dome-Cleary Summit area, Fairbanks district, Alaska
Robert Humphrey Forbes, H.D. Pilkington, D. B. Hawkins
1968, Open-File Report 68-101
Anomalous gold values have been discovered in hydrothermally altered quartz diorite, quartz monzonite, and quartz mica schist at the head of Fox Creek; and in similarly altered quartz diorite in the Granite Creek area. Channel samples across some of these altered zones have produced anomalous gold values over widths which...
Occurrences of gold and other metals in the Upper Chulitna district, Alaska
C.C. Hawley, A. L. Clark (compiler)
1968, Circular 564
Preliminary geologic map of the Rumker quadrangle of the moon
R. E. Eggleton, E.I. Smith
1968, Open-File Report 68-93
