Coin Rescue Inc
Well-known member
I had some time this morning to brush up on soaked soil theory - I agree the EMI on the subject videos was a problem too.
Ocean water is said to be 3.5 % NaCl - Sodium Chloride or common salt - via Google
So by volume 16 oz of water would contain approximately 1/2 an oz in volume of Salt (Sodium Chloride) - and we know that plays heck with detectors
The electro conductivity (dS/m) of salt water on a scale from 1 to 100 is 42 for 3.5% salt water (I found a chart from 1955 that shows electro conductivity in relationship to the percentages of salt in water)
(Salt is a common term in science for dissolved Minerals)
Other common Soluble "salts" that can show up in soil are:
Magnesium Sulfate
Potassium Chloride
Magnesium Chloride
Calcium Chloride
Theory
These Minerals have similar Electro Conductivity of 10 to 42 at 1% to 3.5% concentration in dissolved water
If the soil is dry these salts do little, just like the dry beach sand is easy on detectors at the salt beaches.
If the soil is water saturated any of these salts can dissolve and then there would be detector issues.
So this is my theory at the moment. I have charts and graphs of these values but they are copyrighted material
The types of soil everywhere have endless combinations of ingredients. Am I on to something here?
Ocean water is said to be 3.5 % NaCl - Sodium Chloride or common salt - via Google
So by volume 16 oz of water would contain approximately 1/2 an oz in volume of Salt (Sodium Chloride) - and we know that plays heck with detectors
The electro conductivity (dS/m) of salt water on a scale from 1 to 100 is 42 for 3.5% salt water (I found a chart from 1955 that shows electro conductivity in relationship to the percentages of salt in water)
(Salt is a common term in science for dissolved Minerals)
Other common Soluble "salts" that can show up in soil are:
Magnesium Sulfate
Potassium Chloride
Magnesium Chloride
Calcium Chloride
Theory
These Minerals have similar Electro Conductivity of 10 to 42 at 1% to 3.5% concentration in dissolved water
If the soil is dry these salts do little, just like the dry beach sand is easy on detectors at the salt beaches.
If the soil is water saturated any of these salts can dissolve and then there would be detector issues.
So this is my theory at the moment. I have charts and graphs of these values but they are copyrighted material
The types of soil everywhere have endless combinations of ingredients. Am I on to something here?