MINERAL STATISTICS


Black Stone: The trap rock of Pachami-Hatgacha and adjacent areas of Birbhum district.
Type of Test Value
Los Angeles Abration value (%) 11.00 – 15.00
Aggregate Impact value (Dry %) 4.00 – 7.00
Aggregate Crushing Strength value (%) 13.00 – 18.00
Sodium Sulphate Soundness value (%) 0.11 – 0.27
Specific gravity 2.94 – 3.01
Quartz:
Test Parameters Unit Results
Silica (SiO2) % 99.37
Alumina (Al2O3) % 0.06
Oxide of Iron (Fe2O3) % 0.21
Titanium Oxide (TiO2) % Nil
Lime (CaO) % 0.05
Magnesia (MgO) % Nil
Potash (K2O) % 0.06
Soda (Na2O) % 0.10
Loss on Ignition % 0.05
Undetermined % 0.10
TOTAL 100.00

Analysis on sample dried at 100°C ∓ 50°C
Fire Clay:
Test Parameters Unit Results
Silica (SiO2) % 43.75
Alumina (Al2O3) % 38.54
Oxide of Iron (Fe2O3) % 1.21
Titanium Oxide (TiO2) % 0.45
Lime (CaO) % 1.15
Magnesia (MgO) % 0.20
Potash (K2O) % 0.25
Soda (Na2O) % 0.41
Loss on Ignition % 13.79
Undetermined % 0.25
TOTAL 100.00

P.C.E. value : +31 to +33
Granite:

Good quality of Granite deposits for mining as decorative stone has been identified identified in Purulia and Bankura district of West Bengal. The most attractive variety or texture is Pink Porphiry and Tiger Skin.

Others :

Mokdumnagar China Clay:
Test Parameters Unit Results
Silica (SiO2) % 47.82
Alumina (Al2O3) % 33.43
Oxide of Iron (Fe2O3) % 2.18
Titanium Oxide (TiO2) % 2.264
Lime (CaO) % 0.92
Magnesia (MgO) % Nil
Potash (K2O) % 0.16
Soda (Na2O) % 0.19
Loss on Ignition % 12.66
Undetermined % --
Feldspar:
Test Parameters Unit Results
Silica (SiO2) % 63.40
Alumina (Al2O3) % 19.30
Oxide of Iron (Fe2O3) % 0.36
Titanium Oxide (TiO2) % Traces
Lime (CaO) % 0.48
Magnesia (MgO) % 0.26
Potash (K2O) % 13.52
Soda (Na2O) % 2.10
Loss on Ignition % 0.33
Undetermined % 0.25
TOTAL 100.00
Iron Ore (Laterite):
Test Parameters Unit Results
Silica (SiO2) % 10.85 – 50.53
Alumina (Al2O3) % 4.45 – 13.69
Total Iron as (Fe2O3) by mass % 27.74 – 73.31
Titanium Oxide (TiO2) % 0.60 – 0.76
Loss on Ignition (LOI) % 8.82 – 12.28
Rock Phosphate (Apatite):
Test Parameters Unit Results
Silica (SiO2) % 6.21 – 18.28
Alumina (Al2O3) % 0.78 – 3.84
Oxide of Iron (Fe2O3) % 12.30 – 22.36
Phosphorous (P2O5) % 15.27 – 30.13
Fluoride (F) % 1.55 – 3.62
Lime (CaO) % 26.17 – 42.64
Magnesia (MgO) % 0.10 – 0.13
Potash (K2O) % 0.07 – 0.09
Soda (Na2O) % 0.45 – 0.88
Loss on Ignition % 2.92 – 9.05
SO3 % 1.23 – 1.87

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