الفهرس Only 14 pages are availabe for public view
 |  | from | 251 |  |  |
| | | from | 251 | | |
Abstract
Characters and Distribution of the Economic Minerals in the Black Sand Deposits of the Coastal Area, West El-Burullus, Egypt and Their Sedimentation Condition.
Geomorphologically, the study area comprises five geomorphic units. The foreshore flat, the backshore flat, El Burullus Lake, cultivated lands and sand dunes. The Mediterranean Sea shoreline is nearly straight. The area is bounded from the north by Mediterranean Sea and from the south by El Burullus Lake.
The percentages of the total heavy economic minerals (magnetite, ilmenite, leucoxene, zircon, rutile, monazite and garnet) in the study area are vary form maximum value equal to 14.27% to minimum value equal 0.63% with an average value of 4.05%.The calculated reserves show that in the upper five meters the ilmenite represents 4244150 ton from the total economic minerals, magnetite represents 2260080 ton and all the other economic minerals (leucoxene, garnet, Zircon, rutile and monazite) represent 487620, 479880, 232200, 131580, and 7740 ton respectively. The relation between each pair of the economic minerals has high positive relation except in the case of monazite relations with magnetite, ilmenite, leucoxene, garnet and zircon where it shows positively moderate correlation. These relations indicate that, the percent of any of the economic minerals can be used as indicator to the percent of the other minerals and the differences in the concentration is attributed to their contents in the source rock and their resistance to the weathering conditions during transportation.
The Fines (sizes finer than the coarse silt, organic materials, shell fragments and salt remains) in the upper five meters vary from a minimum value of 1.3 % to a maximum value of 21.02 with an average percent equal to 10.03%. The grain size distribution of the sand fraction for the borehole samples indicate that the distribution is unimodal with modal class lying in the fine sand size fraction. The grain size distributions of the economic minerals are mostly unimodal distributions with modal class lies in the very fine sand size class except in garnet where the fine sand size class considers the modal class. This was attributed to the high hardness of garnet that resists the mechanical erosion more than the other minerals.
The quantitative distribution of the radio elements shows that the total field radioactivity varies from 0.6 cps to 25.8 cps with an average of 8.60 cps. The uranium content varies from 0.0 ppm to 9.03 ppm with an average 2.54 ppm, thorium content varies from 0.3 ppm to 36.3 ppm with an average 9.90 ppm, and potassium content varies from 0% to 2.8% with an average 0.58%. The correlation coefficient between the radiometric variables shows positive relations between the five variables T.C., eU, eTh, eTh/K and eU/K and negative relation between K% and the other six variables. These data indicate that the total counting measured in the area under study usually reflects the thorium and uranium contents in the black sand deposits
In a case of building a plant of separation and concentration of the economic minerals of a capacity 2000 ton per hour and 16 hour work every day for 300 day work a year, the annual production of the economic minerals from the study area will be 362129, 192840, 41606, 40945, 19812, 11226 and 660 ton for ilmenite, magnetite, leucoxene, garnet, zircon, rutile and monazite, respectively.