نتایج جستجو برای: gold ore province
تعداد نتایج: 167704 فیلتر نتایج به سال:
BACKGROUND In 2010, Médecins Sans Frontières discovered a lead poisoning outbreak linked to artisanal gold processing in northwestern Nigeria. The outbreak has killed approximately 400 young children and affected thousands more. OBJECTIVES Our aim was to undertake an interdisciplinary geological- and health-science assessment to clarify lead sources and exposure pathways, identify additional ...
BACKGROUND In May 2010, a team of national and international organizations was assembled to investigate children's deaths due to lead poisoning in villages in northwestern Nigeria. OBJECTIVES Our goal was to determine the cause of the childhood lead poisoning outbreak, investigate risk factors for child mortality, and identify children < 5 years of age in need of emergency chelation therapy f...
The Golden Butte sediment-hosted disseminated (Carlin-type) gold deposit is located on the western flank of the Cherry Creek Range in east central Nevada. The ore body contains nearly 3 million tons of gold ore with an average grade of 0.031 ounces per ton. The main host of the gold ore is the Mississippian Chainman Shale, a carbonaceous, silty claystone to siltstone. A low-angle (normal?) faul...
A total gold extraction of 70.2% could only be reached via direct cyanidation from a refractory As-, Sand C-bearing gold concentrate calcine, and the gold extraction varied noticeably with different size fractions. The reasons for unsatisfactory gold extraction from the calcine were studied through analyses of chemical composition, chemical phase and SEM-EDS of different sizes of particles. It ...
samples of the waste rock obtained from marofengin south africa ground 60, 70 and 80% passing 75µm were leached with cyanide in bottle roll tests. the results obtained showed that the percentage gold dissolution depends more on the ore size consists than on the cyanide concentration with the highest average dissolution rates of 88.75, 94.34 and 95.90% found at 600, 500 and 500 ppm, for 60, 70 a...
Samples of the waste rock obtained from Marofengin South Africa ground 60, 70 and 80% passing 75µm were leached with cyanide in bottle roll tests. The results obtained showed that the percentage gold dissolution depends more on the ore size consists than on the cyanide concentration with the highest average dissolution rates of 88.75, 94.34 and 95.90% found at 600, 500 and 500 ppm, for 60, ...
The future exploration of Mars is likely to utilize resources that can be extracted in situ. An overview of the geology of Mars has been presented and several mechanisms that could result in the formation of ore deposits have been identified. These include deposits caused by hydrothermal fluids resulting from volcanic activity, large igneous province formation and impact craters. Surface enrich...
In recent decades, the human demand for mineral resources has increased dramatically, and mining of shallow deposits basically been completed. The prospecting direction turned to concealed deposits. For this reason, various penetrating geochemical methods have developed find minerals a series exploration techniques proposed. At same time, use gene as new technique presented in years is feasible...
The Longquanzhan deposit is one of the largest gold deposits in Yi-Shu fault zone (central section Tan-Lu zone) Shandong Province, China. It an altered-rock type which ore bodies mainly occur at contact between overlying Cretaceous rocks and underlying Neoarchean gneissic monzogranite. Shi et al. reported that this formed 96 ± 2 Ma using pyrite Rb–Sr dating method represents a new mineralizatio...
The Mahin area is a part of TaromHashtjin zone that located in west of Qazvin province in northwest of Iran. Many copper and base metals ore deposits are hosted by this zone. High potential localities identification in this area is very necessary. The objective of this research, is finding hydrothermal alteration zones by remote sensing methods and best processing technique of Advanced Spacebor...
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