The specific gravity of Gravel/sand IN SOIL
Buried 200m below ground and compacted for 40M Years is around 2.6
The Gravel has high amounts of hematite as washed down from MtGee, SG of hematite is 5.8
http://www.umeciv.maine.edu/cie366/specific_gravity/default.htm
Dont know where you get your ridiculous numbers from.
I am sure that it is purely to discredit me and support your mates at MTN
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