METHOD OF EXPLORATION Seismic method gravity method magnetic

METHOD OF EXPLORATION - Seismic method - gravity method - magnetic method - electrical and electromagnetic method - radioactive method

��������� - Airborne geophysical survey : regional - Ground geophysical survey : semi detailed & detailed

Airborne geophysical survey http: //www. gsi. gov. in/AMSE. htm

��������� magmatic hydroth ������ Lou Lake ������� potassium ��� (A), e. Th/K ��� e. U/e. Th ��� (C) ����� total field ma http: //gamma. gsc. nrcan. gc. ca/appgeo_e. php#exploration

������ ����� porphyry-Cu-Au http: //gamma. gsc. nrcan. gc. ca/appgeo_e. php#exploration

��������� ������ http: //gamma. gsc. nrcan. gc. ca/appgeo_e. php#exploration

Ground geophysical survey

Seismic method exploration ��������� Seismic Reflection ; shallow-depth survey Seismic Refraction ; deep-depth survey http: //www. geophysical. biz/seisrf 2. htm

Seismic method exploration Seismic Reflection http: //www. amcl. ca/geophysicalservicesmethods. html

Seismic method exploration Seismic Refraction http: //www. amcl. ca/geophysicalservicesmethods. html

Seismic method exploration �������� : ���������������� Seismic Refraction

electrorical method exploration -Resistivity -Self-potential -Induced polarization

Resistivity method exploration �������� http: //www. amcl. ca/geophysicalservicesmethods. html

Resistivity method exploration Common Rocks/Materials Resistivity (ohm meters) Ore Minerals Resistivity (ohm meters) Clay 1 – 100 Pyrrhotite 0. 001 – 0. 01 Graphitic Schist 10 – 500 Galena 0. 001 – 100 Topsoil 50 – 100 Cassiterite 0. 001 – 10, 000 Gravel 100 – 600 Chalcopyrite 0. 005 – 0. 1 Weathered Bedrock 100 – 1000 Pyrite 0. 01 – 100 Gabbro 100 – 500, 000 Magnetite 0. 01 – 1, 000 Sandstone 200 – 8, 000 Hematite 0. 01 – 1, 000 Granite 200 – 100, 000 Sphalerite 1000 – 1, 000 Basalt 200 – 100, 000 Limestone 500 – 10, 000 Slate 500 – 500, 000 Quartzite 500 – 800, 000 Greenstone 500 – 200, 000

Principle of resistivity Modified from www. easc. edu/introduction to geophysics From Ohm’s Law : V=IR R=V/I

Modified from www. easc. edu/introduction to geophysics

Pole – pole Pole - dipole Dipole - dipole Wenner Schlumberger ����� electhod Modified from The Berkeley Course in Applied Geophysics DC Resistivity men. htm

Electromagnetic method exploration ��������� http: //www. hydrogeophysics. com/sampleprojects. html

Electromagnetic Sounding �������� http: //www. hydrogeophysics. com/sampleprojects/pipeline. gif

gravity method exploration ����������

gravity method exploration ���������

gravity method exploration �������� ��

magnetic method exploration �������

magnetic method exploration Rock/Mineral Magnetic Susceptibility Rocks Salt 0 – 0. 001 Slate 0 – 0. 002 Limestone 0. 00001 – 0. 0001 Granulite 0. 0001 – 0. 05 Rhyolite 0. 00025 – 0. 001 Greenstone 0. 0005 – 0. 001 Basalt 0. 001 – 0. 1 Gabbro 0. 001 – 0. 1 Dolerite 0. 01 – 0. 15 Minerals Pyrite 0. 0001 – 0. 005 Hematite 0. 001 – 0. 0001 Pyrrhotite 0. 001 – 1. 0 Chromite 0. 0075 – 1. 5 Magnetite 0. 1 – 20. 0 ���������

magnetic method exploration �������� http: //www. geophysical. biz/magnetic. htm

magnetic method exploration ���������� http: //www. digistar. mb. ca/minsci/finding/magnetic. htm

Ground Penetrating Radar (GPR) ��������� http: //www. geophysical. biz/gpr 1. htm

Ground Penetrating Radar (GPR) ��������� http: //www. geophysical. biz/gpr 3. htm

Ground Penetrating Radar (GPR) ���������� http: //www. geovision. com/gpr. html

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