Main Page
Dean's Introduction
Org Structure
About RACI
Deans of the Institute
Our Partners
Our Mission and distinctiveness
Quality Policy
Members of the Advisory Committee
More about RACI's administration
the Institute's objectives
our capabilities
more of Capacity Institute
decisions & generalizations
List of Sc.
Int'l Scientific Chairs
Scientific Chairs
Quotes on KAU’s Scientific Chairs
history Scientific Chairs
Publications and Research Institute consultations
models and success stories
Sponsors’ Guide
Researchers’ Guide
Scientific publications
Sponsored chairs
Institute Activities
final championship Institute
accreditation EFQM
Ramadan breakfast
Our Services
Our Services And Capabilities
Scientific Research Chairs
Quotes on KAU’s Scientific Chairs
History Scientific Chairs
Publications and Research Institute consultations
Models And Success Stories
Sponsors’ Guide
Researchers’ Guide
Consulting
Quotes on RACI Consultation Services
Our Partners
Consultation Archive 1419
Consultation Archive 1420
Consultation Archive 1421
Consultation Archive 1422
Consultation Archive 1423
Consultation Archive 1424
Consultation Archive 1424
Consultation Archive 1425
Consultation Archive 1426
Consultation Archive 1427
Consultation Archive 1428
Consultation Archive 1429
Contract research and studies
Our Partners
research and studies Contractual - Medical
research and studies Contractual - Engineering
Economic Projects
Quotes on RACI research and studies Services
Supervision of the educational and academic
Educational Supervision
Our Partners
Curriculum Design
Academic Training
Curriculum Assessment
Scientific services
Exhibition Service's continued scientific
My Previous Scientific Services
Our capabilities
General Statistics
Academic Supervision
Classification of Scientific Chairs
Classification of institute activities
Institute Activities According The Sector
Classification of Contract Research
classification of dedicated consultations
Academic Supervision
Files
RACI Map
Research
PhotoAlbum
Contact Us
Favorite Links
Latest News
عربي
English
About
Admission
Academic
Research and Innovations
University Life
E-Services
Search
Research And Consulting Institute
Document Details
Document Type
:
Article In Journal
Document Title
:
Mineralogy and mineral chemistry of auriferous stream sediments from Al Wajh area, NW Saudi Arabia
كيمياء المعدن لسيديمينتس جدول ذهبيّ و علم المعادن من منطقة الوجه، إن دبليو المملكة العربيّة السّعوديّة
Subject
:
Mineralogy and mineral chemistry of auriferous stream sediments from Al Wajh area, NW Saudi Arabia
Document Language
:
English
Abstract
:
A detailed ore microscopic study strengthened by fire assay data of Al Wajh stream sediments (Wadi Al Miyah, Wadi Haramil and Wadi Thalbah) in northwestern Saudi Arabia shows economic concentrations of gold in the silt fraction (40–63 μm). However, particles of extremely fine “dusty” gold (≤40 μm in size) were also identified in most stations as independent grains. The maximum gold content in the samples of Wadi Al Miyah is 13.61 wt%, which is reported for the heavy fraction (<40 μm). Maximum gold content in the heavy fractions of Wadi Haramil stream sediments amounts 6.90 g/t Au in a relatively coarse fraction (63–125 μm). It appears that the most fertile heavy fraction in gold among the analysed samples are those from Wadi Thalbah that have the highest index figure, which makes the placer gold in them more profitable from the economic point of view. The gold content in the heavy fractions of samples from Wadi Thalbah is economically high lying in the range 6.27–28.83 g/t Au, except for a sample collected at the upstream with 0.77 g/t Au. Al Wajh stream sediments (including the beach light and black sands) are also rich in Fe–Ti oxides, rutile and zircon, whereas monazite and thorite are much lesser. Mineral chemistry of magnetite indicates a distinct titanomagnetite variety (with 3.85 wt% TiO2) which is consistent with the ore microscopic investigation. The titanomagnetite is V- and Cr-free, which indicates derivation from a more felsic source than a mafic one. No traces of U were found in zircon that sometimes bears up to 2.74 wt% Hf2O3. Chemical analyses of monazite show typical common contents of rare earth elements such as La, Ce, Nd and Sm. Thorite is either U-free or uranothorite varieties where the latter contains up to 31.79 wt% UO2. One of the U-free thorite grains is Y-bearing and contains 7.13 wt% Y2O3
ISSN
:
1319-0989
Journal Name
:
Arts and Humanities Journal
Volume
:
2
Issue Number
:
1
Publishing Year
:
1428 AH
2009 AD
Article Type
:
Article
Added Date
:
Monday, February 7, 2011
Researchers
Researcher Name (Arabic)
Researcher Name (English)
Researcher Type
Dr Grade
Email
اسعد مفتي
Mufti, Asaad
Researcher
Doctorate
Files
File Name
Type
Description
28910.pdf
pdf
Back To Researches Page