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Geology topics

G.W. Day

Publications and source records attributed to G.W. Day.

At least 37 records · Page 2Linked to original sources
USGS1985

Analytical results and sample locality map of stream-sediment and heavy-mineral-concentrate samples from the Chuckwalla Mountains Wilderness Study Area (CDCA-348), Riverside County, California

In March 1982, we conducted a reconnaissance geochemical survey of the Chuckwalla Mountains Wilderness Study Area, Riverside County, California. The Chuckwalla Mountains Wilderness Study Area comprises about 90 mi 2 (233 km) in the southeast corner of Riverside County, California, and lies just south of Interstate Highway 10 at Desert Center, California, which is approximately 180 mi east-southeast of Los Angeles (see figure 1)

California↗
USGS1985

Review of the use of magnetic concentrates in geochemical exploration

Magnetic concentrates recovered readily by hand magnet from alluvial sediments or panned concentrates have been used successfully in exploration as a geochemical sample medium for Cu, Zn, Co, Cr, Mo, Ni, V, Sn, and Be, particularly in arid environments where alluvial sediments may be contaminated by aeolian debris. Opportunity for this use arose recently as chemical and spectrographic techniques were developed to determine the abundances of a variety of trace elements in Fe-rich media. The use of analytical data from magnetic concentrates was introduced as one of several anomaly-enhancement techniques based on heavy minerals and intended to identify blind ore deposits. An extensive literature, reviewed here, on the relation of the chemical composition of the mineral magnetite, a main component of magnetic concentrates, to geologic conditions of origin, facilitates the interpretation of trace-element data in the context of association with ore deposits.

Open-File Report↗