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Find below the Resistivities of common ores and rocks
Apparent Resistivities
of common ores and rocks
ROCKS APPARENT
RESISTIVITY(ΩM)
Topsoil 50
– 100
Sand (loose) 500
– 5000
Gravel 100
– 600
Clay 1
– 100
Weathered bedrock 100
– 1000
Sandstone 200
– 8000
Limestone 500
– 10000
Greenstone 500
-200000
Gabbro 100
– 500000
Granite 200
– 100000
Basalt 200
– 100000
Graphitic schist 10
– 500
Slates 500
– 500000
Quartzite 500
– 800000
ORES
Pyrites 0.01
– 100
Pyrrhotite 0.001 - 0.01
Chalcopyrite 0.005
- 0.1
Galena 0.001
– 100
Sphalerite 1000
– 1000000
Magnetite 0.01
– 1000
Cassiterite 0.001
– 10000
Hematite 0.01
– 1000000
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