scholarly journals Sedimentological Characterization of Alluvial Gold Deposits of Betrare-Oya and Its Surroundings (Cameroon Eastern Region)

2020 ◽  
Vol 11 (12) ◽  
pp. 783-799
Author(s):  
Daniel Mackaire Eloung Nna ◽  
Paul Desiré Ndjigui ◽  
Joseph Quentin Yene Atangana ◽  
Alexis Jacob Nyangono Abolo ◽  
Constantin Maurice Ndongue
Keyword(s):  
Gold Deposits ◽  
Eastern Region ◽  
Alluvial Gold

scholarly journals GEOCHEMICAL ASSESSMENT OF TRACE METALS IN SOIL, STREAM WATER AND SELECTED FOOD CROPS AT KIBI GOLDFIELDS ENVIRONMENT, GHANA

2020 ◽  
Vol 4 (1) ◽  
pp. 71-76
Author(s):  
Douglas Baah Siaw ◽  
Solomon S.R. Gidigasu ◽  
Anthony Andrews ◽  
Emmanuel Gikunoo ◽  
Gordon Foli
Keyword(s):  
Trace Metals ◽  
Stream Water ◽  
Control Site ◽  
Food Crops ◽  
Eastern Region ◽  
Conservative Tracer ◽  
Guideline Values ◽  
Alluvial Gold ◽  
Translocation Factors ◽  
Impacted Site

This study assesses environmental receptors impacted by alluvial gold mining at Kibi Goldfields Limited in the Eastern region of Ghana to establish trace metals contamination risk. Specific objectives are to determine concentrations of (1) As, Cr, Ni and Pb in soils, drainage and food crops, using X-ray fluorescence, (2) Cl- in drainage using standard methods. Mean concentrations of As, Cr and Ni in soils are higher at impacted sites than control sites; while Pb and As concentrations in drainage exceeds the maximum contamination guideline values in drinking water. Using Cl- as a conservative tracer, As and Pb are adsorbing from water, while Cr and Ni are desorbing into water. In the food crops, bioaccumulation factors of As and Ni are profound at the impacted site than control sites; Except Cr in cocoyam at impacted sites, translocation factors are negligible in the food crops. Cr bioaccumulates in in cocoyam and plantain at the control site, while Ni bioaccumulates in only plantain at the impacted sites. Overall, the metal contamination is of concern in the receptors, except Pd in plants. Results from this study can be used for trace metals risk assessment in the environment.

scholarly journals Anthropogenic Vegetation in the River Valley Amalat

2019 ◽  
Vol 16 ◽  
pp. 00049
Author(s):  
Marina Tsyrenova ◽  
Evgenia Pyzhikova ◽  
Elena Vasilyeva
Keyword(s):  
Vegetation Cover ◽  
Gold Mining ◽  
Research Study ◽  
Gold Deposits ◽  
Open Pit ◽  
Current State ◽  
Disturbed Areas ◽  
Alluvial Gold ◽  
Anthropogenic Vegetation ◽  
Mining Methods

The article presents the results of a research study of anthropogenic affects of gold mining on forest landscapes in Northern Transbaikalia, Russia and processes of natural reclamation of vegetation cover of the disturbed areas. The study area is located northwest of the Maliy Amalat River, which flows along the Vitim Plateau; in the floodplains of its two tributaries the Aunik River and the Bagdarin River. It is an area where a large number of alluvial gold deposits have been discovered. Some of these deposits are currently being developed, some have already been explored, and some have been abandoned. The authors consider the current state of vegetation cover in a key area of the Amalat River basin, near villages of Malovsky and Bagdarin. The problem of natural resources development and conservation is becoming extremely important for the area under study because open-pit gold mining methods that are used here drastically change the environment and affect water, land and forest resources.

Molecular Characterization of Potassium Solubilizing Bacteria from Crop Rhizosphere of the North Eastern Region of India

2018 ◽  
Vol 114 (12) ◽  
pp. 2543 ◽  
Author(s):  
Smrita Buragohain ◽  
Dhruba Jyoti Nath ◽  
Yumnam Bijilaxmi Devi ◽  
Badal Bhattacharyya ◽  
Samiron Dutta
Keyword(s):  
Molecular Characterization ◽  
Eastern Region ◽  
The North ◽  
North Eastern ◽  
Potassium Solubilizing Bacteria

scholarly journals Pattern of Occurrence of Leukemia at a Teaching Hospital in Eastern Region of Nepal - A Six Year Study

2009 ◽  
Vol 48 (173) ◽  
Author(s):  
Ritu Kulshrestha ◽  
SP Sah
Keyword(s):  
Acute Myeloid Leukemia ◽  
Myeloid Leukemia ◽  
Distribution Patterns ◽  
Eastern Region ◽  
Lymphoid Leukemia ◽  
Time Period ◽  
The World ◽  
Characterization Of Distribution ◽  
Acute Myeloid

INTRODUCTION:Pattern of leukemia is known to vary widely throughout the world. The characterization of distribution patterns of different subtypes of leukemia in Nepal needs further study. We wanted to study the leukemia pattern in our institute.METHODS:A retrospective study of 196 cases of leukemia, diagnosed at BPKIHS, between January 1997 to December 2002 was done. We analyzed the pattern of leukemia at BPKIHS by morphological subtype, gender, age at diagnosis, time period of diagnosis (seasonality), and geographic distribution.RESULTS:Morphological sub typing showed that 121 cases were of acute leukemia and 75 of chronic leukemia. Chronic myeloid leukemia constituted the single largest group comprising 35.2 % of all cases, followed by acute myeloid leukemia (28.57 %) and acute lymphoid leukemia (19.9 %). Maximum numbers of cases were from the lowlands while least number of cases were from the mountain districts. Results were compared with literature from Nepal and other countries. This is the second series of leukemia from Nepal.CONCLUSIONS:The data published in this study reflects the leukemia pattern in the eastern region of Nepal. The pattern and distribution of AML, CML, ALL was similar to that in the developed western countries while the lesser frequency of CLL was similar to that in Southeast Asian regionKey Words:leukemia, pattern, eastern Nepal, seasonality.

scholarly journals Giant Placers of the Victorian Gold Province

SEG Discovery ◽  
2004 ◽  
pp. 1-18
Author(s):  
Martin J. Hughes ◽  
G. Neil Phillips ◽  
Stephen P. Carey
Keyword(s):  
Late Cretaceous ◽  
Quartz Vein ◽  
Late Eocene ◽  
Gold Deposits ◽  
Gold Production ◽  
Placer Gold ◽  
High Rainfall ◽  
Hydrothermal Quartz ◽  
Alluvial Gold ◽  
Primary Gold

ABSTRACT The Victorian gold province has yielded 2500 tonnes (t) Au, nearly 2 percent of cumulative world gold production, mostly mined between 1851 and 1910. Fifty-five percent (1375 t) was placer gold from modern and paleostream systems, and from eluvial deposits, and the remainder came from primary quartz vein-related deposits. Most of the alluvial gold placers are in unconsolidated or weakly cemented quartz pebble conglomerate and gravel, dominated by hydrothermal quartz, although a few paleoplacers are within duricrusted conglomerate that required crushing. Large and abundant gold nuggets were common. Placer gold deposits formed in three intervals following uplift in the Late Cretaceous, Late Eocene, and Pliocene. An important factor in the preservation of the paleoplacers has been their burial by younger sediments and basalt flows, with consequent protection from erosion and dispersal. Factors in the formation of the giant gold placers of Victoria include the following: (1) the existence of a major primary gold province with several multimillion-ounce gold deposits; (2) uplift and reactivation of older faults; and (3) high rainfall and deep Paleogene weathering.

scholarly journals Main factors determining potential qualified appearance of pebble and effel dumps of depleted alluvial gold deposits

2018 ◽  
Vol 56 ◽  
pp. 01004
Author(s):  
Gadzhi Mirzekhanov ◽  
Zoya Mirzekhanova
Keyword(s):  
Granulometric Composition ◽  
Climatic Factors ◽  
Gold Deposits ◽  
Gold Content ◽  
Alluvial Deposits ◽  
Resource Potential ◽  
Alluvial Gold ◽  
Anthropogenic Deposits ◽  
Main Factors ◽  
Process Loss

The influence of two most important factors determining gold losses during mining of alluvial deposits is considered. They include the granulometric composition of sands and the initial gold content in them. It is shown that the underestimation of these indicators in the assessment of anthropogenic deposits significantly reduces the resource attractiveness of depleted objects. Specific examples give calculations that allow for a more accurate predictive estimate of the resource potential of the dredging tailing (effel) dumps. Based on the consideration of natural and climatic factors in determining the conditions, the placer content is plotted for the gold content in the sands of various economic areas of Khabarovsk Region. It has been established that at the same values of the designed process loss and given the comparability of the main placer parameters, a high average gold content in the initial sands makes it possible to predict within the dump some objects with standard contents.

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