English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

A reconnaissance geochemical survey in northern Sonora has been completed by the Consejo de Recursos Minerales and the U.S. Geological Survey. The geochemical reconnaissance was part of the first phase of a cooperative project designed to develop new geochemical, geophysical, and geological exploration techniques and multidi sciplinary strategies useful in the search for mineral deposits in the Sonoran environment. Multiple sample media were employed in the study. The samples were analyzed for many elements and multivariate interpretive techniques were used to develop geochemical interpretations. Pulverized stream sediments screened to -80 mesh and pulverized nonmagnetic, heavy-mineral concentrates screened to -30 mesh were found to be the most useful sample media. Samples were analyzed for 30 to 60 elements by emission spectrographic methods and in some cases atomic absorption methods. The analytical values and map coordinates for approximately 1200 sample sites were entered into the U.S. Geological Survey's RASS computer data system, and selected data sets were analyzed by various statistical computer programs to produce distribution maps of selected elements, tabular statistics, and multivariate analyses. Patterns of element interrelationship were seen most easily in the nonmagnetic fraction of the heavy-mineral concentrates. This sample medium yields element suites dominated by the influence of mineralization and has been found to be very useful in mineral exploration studies. Introduction A cooperative project between the Consejo de Recursos Minerales of Mexico (CRM) and the United States Geological Survey (USGS) was established to conduct an experimental program to develop new geochemical, geophysical, and geological exploration techniques and multidisciplinary strategies useful in the search for mineral deposits in the Sonoran environment. To date the study 2 area has been confined to a 25,000 km strip of land of medium to high mineral potential in Sonora, Mexico, extending from the section of the U.S.-Mexico border between Sasabe and Agua Prieta, southeast through Cananea, Nacozari, and terminating in the vicinity of Villa Hidalgo (Oputo) in the east and Cumpas in the south (fig. 1). The first phase of the project was the regional geochemical, geophysical, p and remote sensing study of the entire 25,000 km project area. A team approach coordinating these disciplines was used to locate and evaluate areas with mineral potential. Geochemical studies were conducted to locate and characterize the mineralized areas, and to provide information about the element suite, the intensity of mineralization, and often the position within a zoned system. Aside from mining company studies of the principal mining districts within the study area, the major previous work of an exploratory nature was the resource evaluation of several areas of Mexico jointly undertaken between 1962 and 1967 by the United Nations and Mexican government (United Nations, 1969), which led to the discovery of the Caridad porphyry copper deposit. Our study, though covering part of the same ground as the United Nations study, utilized modified exploration techniques with the hope of discovering subtle anomalies previously overlooked. Sampling Procedures Orientation studies carried out prior to the regional reconnaissance revealed that the exclusive use of -80 mesh screened stream-sediment samples would be of limited success in the search for copper deposits within the study area. A multiple sample media approach testing for many elements and employing mult i van" ate interpretive techniques was found to be necessary for P o rp K ij r« j c o p p e r

A regional geochemical reconnaissance, north-central Sonora, Mexico; techniques and analytical data