Glass Sand a special type of sand
that is suitable for glass making because of its high silica content,
and its low content of iron oxide, chromium, cobalt and other
colourants. In Bangladesh surface to near surface deposits of glass
sands are found in Balijuri of Sherpur district, Shajibazar and
Teliapara of Habiganj district, Chauddagram upazila of Comilla district
and Dakshin Zangal of Hathazari upazila in Chittagong district.
Sub-surface glass sands were found in Maddhyapara, Barapukuria and
Dighipara of Dinajpur district and Khalaspir of Rangpur district. The
sand contains about 88 to 99% of silica with a few percentages of iron,
titanium, cobalt, and other materials.
The Geological Survey of
Pakistan (GSP) first discovered glass sands in 1960 at Balijuri Mouza of
Sreebardi upazila in Sherpur district. Detail investigation in this
area continued in the years between 1961 and 1962, and 1977 and 1980.
The glass sands are deposited in 30 lenses of 0.15 to 2.13m thick. The
reserve is 0.64 million ton in an area of 0.596 sq km. GSP conducted
survey at Nayapara area of Habiganj district in 1970-71. Later on in
1972-73, and 1974-76 detail work on this was completed by geological survey of bangladesh
(GSB). In this area the sands are deposited in lenses of 0.15m to 1.80m
thick and the total reserves is 1.40 million ton covering an area of
0.9811 sq km.
The glass sand at Batisha of Chauddagram area of Comilla
district was first discovered by the National Mining Institution in
1968. GSP conducted detail survey in the area in 1968-70 and continued
by GSB between 1972 and 1974. The sands are deposited in lenses of 0.25m
to 1.70m thick near the foothills of Tripura upto Nayapara in the north
and Datteswar in the south at the Indian border. The sand is found at
the surface to near surface (0.5m to 3.5m). The reserves of total 34
lenses are 0.285 million ton in an area of 0.234 sq km.
Besides
the surface deposits the glass sands are also found at subsurface of
Lalghat-Lamakata at Tahirpur upazila of Sunamganj district near
Bangladesh-India (Meghalaya) border at a depth of 23.78m to 72.95m below
the surface in 1991. The sands are present in two layers of 1.22 to
1.83m thick (each). The reserve is 2.55 million ton upto the down dip of
164m of the layers. The subsurface deposit of glass sand at Maddhyapara
was discovered in 1974 at the depth of 128m below the surface. It is
present on the top of the Pre-Cambrian basement complex. The glass sand
with clay layer is 5.2 to 16m thick and the average of sand layer is 4m
thick. The reserves covering an area of 1.0 sq km are 17.25 million ton.
The glass sand at Barapukuria was discovered in 1985 at a depth of 118m
to 180m below the surface while drilling for coal in the basin. The
average thickness of the sand is 21.90m and the reserves in an area of
one square kilometre is 90 million ton. Besides these, subsurface
deposits of glass sand was also found at Dighipara basin in 1994. The
sands are present in 5 layers in this basin at a depth ranging from
62.19m to 325.30m below the surface. The total thickness of the 5 layers
is 77.13m. The reserve is yet to be confirmed.
The glass sand at
Chauddagram-Nayapara-Datteswar area
are quarried and used in the Osmania Glass Sheet Factory at Chittagong.
The sub-surface deposits at the Rangpur platform area may be utilised if
there is any open cast mine for coal or hard rock in future in the
area. [Banglapedia, QM Arifur Rahman]
If you are looking for a heating and air conditioning company in the Tulsa County area, Our professional technicians can help you select, install, and maintain equipment to assure efficiency, reliability, and comfort over the lifetime of your products
ReplyDeleteclick here