Analysis by nuclear reactions and activation

For the separation and determination of low gold concentrations in the sub μg g−1 range in ore and sediment samples an analytical technique has been developed, based on the selective adsorption of gold on the chelating resin, Srafion NMRR, and the in situ determination of the retained gold by instrumental neutron activation analysis (INAA), using the 411.8 keV line of the isotope198Au. In the case of higher gold concentrations Au could be directly determined in the ore by the technique of loss-free counting in spite of the high radioactivity of the investigated samples. By the described procedure it was possible to determine Au amounts in the range of ng g−1 sediments.

Separation of gold on a selective chelating ion exchanger and in situ determination by gamma-spectroscopy

Analysis by Nuclear Reactions and Activation A Current Bibliography

Utilizing the k_0-IAEA program to determine rare earth elements in soil samples from gold-mining areas in Sudan

An integrated analysis of several regional geological and geophysical factors allowed to select the Makhtesh Ramon area (northern Negev, Israel) for sesarching diamondiferous associations. The most important regional factor is the Middle Cretaceous maximum in the development of upper mantle hot spots brightly appearing in this area. Analysis of magnetic (paleomagnetic), self-potential and ionselective data inambigously indicate presence of some bodies possibly having kimberlite (lamproite) origin occurring at small depths (8 – 50 m) in the western Makhtesh Ramon. Repeated erosion processes in the area caused removing most part of sedimentary associations that significantly simplified the processes of mineral sampling and rock withdrawn for geochemical and petrological analyses. Comprehensive mineralogical analyses enabled to detect the following minerals-satellites of diamond associations: chrome-diopside, orange garnet, bright-crimson pyrope, picroilmenite, moissanite, corundum, black spinel, olivine, anatase and tourmaline (including black samples). These minerals do not rolled and oxidized that is an additional evidence of the neighboring occurrence of the indigenous rocks. Data of electronic microscopy show that the grains of (1) picroilmenite and (2) pyrope contain, respectively: (1) cobalt, chrome, magnesium and nickel and (2) chrome, magnesium and aluminum. This indicates that both picroilmenite and pyrope have the hyper-abyssal origin that also is an indicator of the possible occurring of diamondiferous pipes. List of secondary-importance satellite minerals includes feldspars, pyroxenes, magnetite, hematite, ilmenite, galenite, pyrite, limonite, mica, chromite, leucoxene, zircon, rutile, etc. These minerals (by their considering with the first group) are also indicators of diamond-bearing of the studied area. Identification of small plates of gold and silver as well as considerable traces of La, Ce, Th, Nb and Ta (Rare Earth Elements) also may be associated with the nearest kimberlite rock occurrence. The total number of recognized microdiamonds consists of more than 300 units; five diamonds (> 1 mm) were identified (sizes of the most largest crystals are 1.2 and 1.35 mm). Thus, on the basis of a set of geological-geophysical factors and identification of the mentioned minerals we can definitely estimate that the Makhtesh Ramon area is perspective for discovering diamondiferous rocks (kimberlite or lamproite pipes) as well as diamond crystals in loose deposits. Discovered silverand gold-bearing and REE signatures may have independent importance.

/pdf/makhtesh-ramon-complex-deposit-southern-israel-a-window-to-2375tjdgpe.pdf

Makhtesh Ramon Complex Deposit (Southern Israel) – A Window to the Upper Mantle

Epithermal neutron activation analysis (ENAA), followed by high resolution gamma-ray spectrometry, was applied to determine trace amounts of Au in the presence of rare earth elements (REE) from vein samples in the basaltic rocks of Makhtesh Ramon, located in southern Israel. The contribution of152Eu (411.1 KeV) to the 411.8 keV peak of198Au was determined using multiple gamma-peak, ratios derived from Eu standards and mixtures of Au and Eu. The concentration of Au was found to be in the range of 10–80 ppb. A group of rare earth elements: La, Eu, Ce, Tb, Sm, Lu, Yb was identified; the concentration of Eu was found to be 0.5 ppm.

Determination of trace amounts of gold in the presence of rare earth elements in rock samples from makhtesh ramon (southern israel), by instrumental epithermal neutron activation analysis

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Determination of trace amounts of gold in the presence of rare earth elements in rock samples from makhtesh ramon (southern israel), by instrumental epithermal neutron activation analysis