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Environmental impact assessment inside and around Mahd Adh Dhahab gold mine, Saudi Arabia

Content Provider	Springer Nature Link
Author	Al Hobaib, Abdallah S. Al Jaseem, K Q. Baioumy, Hassan M. Ahmed, Ahmed H
Copyright Year	2010
Abstract	Environmental impact of the mining activities in the Mahd Adh Dahab gold mine was examined through detailed chemical analyses of a number of samples represent the gold-bearing rocks, soils, dust, and plants from inside and outside the mine area and within the Mahd City as well as the surrounding areas. The obtained data were compared with the standard values of heavy metals concentrations in order to evaluate the pollution levels of these activities on the different systems around the mine area. The data of rock samples shows relatively high concentrations of Cu (up to 11.9%), Pb (up to 4.1%), and Zn (up to 14.2%), which attributed to the outcropping of the sulfide-bearing veins on the surface of the mine area. Soil samples inside the mine area show high concentrations of Zn, Cu, Cd, Pb, and As compared to those from outside the mine indicating pollution impact of the mine activities on soils from inside the mine with these elements. Dust samples collected from inside the mine have considerably high concentrations of Cd, Zn, and Pb compared to those from outside the mine. Values of heavy metals in the collected dust from outside the mine are comparable with those from many big cities including Riyadh City, Saudi Arabia, indicating contaminations with heavy metals to the dust from inside the mine at Mahd Adh Dahab City. Heavy metals concentrations in the stems and leaves samples of the various types of plants inside and outside Mahd Adh Dahab gold mine area show that they have relatively higher concentrations of Cu and Zn compared to other metals. Stem samples show relatively higher concentrations of Zn, Cu, Cr, and V compared to the leaves samples. Although values of most heavy metals in the plants, both stems and leaves, are comparable with those of the typical levels of heavy metals in plants, Co and Cr show relatively higher concentrations suggesting a pollution impact of the mine activities in plants with Co and Cr. As a conclusion, results indicated that the contamination effect of Mahd Adh Dahab gold mine activities are clear in soils and dusts inside the mine area with some metals such Zn, Cu, Cd, and Pb due to their relatively enrichment in mineralization. Therefore, careful treatments of the waste dump materials inside the mine area are recommended to protect soils and air contaminations and to prevent the extension of pollution outside the mine in the future.تهدف الدراسة الحالية الى قياس مدى التاثير البيئى لعمليات استخلاص الذهب بمنطقة منجم مهد الذهب بالمملكة العربية السعوديه على التربه والهواء والنباتات داخل وحول منطقة المنجم من خلال التحليل الكيميائى لعدد من العينات تمثل الصخور الحاملة للذهب وعينات من التربه والهواء والنباتات التى جمعت من داخل وخارج المنجم ∙ وقد قورنت النتائج التى تم الحصول عليها بالمعدلات القياسية للعناصر الثقيله فى التربه والهواء والنباتات للوقوف على مستوى تلوث منطقه الدراسه تاثرا بعمليات استخلاص الذهب لمنجم مهد الذهباظهرت نتائج تحليل العينات الصخرية الارتفاع النسبى لتركيزات عناصر النحاس (يصل الى 11.9%) والرصاص (يصل الى 4.1%) والزنك (يصل الى 14.2%) نتيجة لوجود العروق الحاملة للكبريتيدات بمنطقة سطح المنجم. عينات التربة من داخل المنجم اظهرت تركيزات مرتفعة من عناصرالزنك والنحاس والكادميوم والرصاص والزرنيخ مقارنة بعينات التربة من خارج المنجم بما يشير الى تاثير عمليات استخراج الذهب على تلوث التربه داخل المنجم. عينات الغبار التى جمعت من داخل المنجم اظهرت تركيزات مرتفعة نسبيا من عناصرالكادميوم والزنك والرصاص مقارنة بعينات الغبار من خارج المنجم والتى تضاهى فى تركيزاتها الغبار فى بعض المدن الكبرى متضمنة مدينة الرياض بالمملكة العربية السعوديه مما يدلل على تاثير عمليات استخراج الذهب على تلوث الهواء داخل المنجم. اظهرت النتائج ايضا ان سيقان واوراق النباتات المختلفة من خارج وداخل منجم مهد الذهب اظهرت تركيزات مرتفعة من عناصر النحاس والزنك مقارنة بباقى العناصر. كما اظهرت عينات سيقان النباتات تركيزات مرتفعة من عناصرالزنك والنحاس والكروميوم والفاناديوم مقارنة بعينات الاوراق. بالرغم من ان معظم تركيزات العناصر الثقيلة فى عينات سيقان واوراق النباتات متطابقة مع القيم النموذجية لهذه العناصر فى النباتات الا ان عنصرى الكوبالت والكروميوم تواجدا بتركيزات مرتفعة نسبيا مما قد يدلل على تاثير عمليات استخراج الذهب على تلوث النباتات بهذين العنصرين.اجمالا يمكن القول بان عمليات استخلاص الذهب بمنطقة منجم مهد الذهب بالمملكة العربية السعوديه كان لها بعض التاثيرات البيئية الضاره على كلا من التربه والهواء داخل المنجم من حيث زيادة تركيزات بعض العناصر الثقيلة مثل عناصرالزنك والنحاس والكادميوم والرصاص نتيجة وجود هذه العناصر بنسب مرتفعة فى الصخور المكونة لمنطقة المجم. وعليه فان هذه الدراسة توصى بضروره التعامل الحذر والتخلص الامن من المخلفات داخل المنجم للحفاظ على البيئه داخل المنجم ومنع امتداد التاثير الضار لهذه المخلفات الى خارج المنجم مستقبلا.
Starting Page	985
Ending Page	997
Page Count	13
File Format	PDF
ISSN	18667511
Journal	Arabian Journal of Geosciences
Volume Number	5
Issue Number	5
e-ISSN	18667538
Language	Arabic
Publisher	Springer-Verlag
Publisher Date	2010-12-23
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Heavy metals Soil Dust Plants Pollution Mahd Adh Dahab Saudi Arabia Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Environmental Science

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