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I am bored!

I am searching about Earth well resistance calculation for 2 weeks and I can't find anything!

when I speak about Earth Well , my mean is one Well about 4 to 6 meters that we put a copper plate in it.one stranded copper wire connects to plate and the other End of wire come out from well entrance.then we fill the well with conductive concrete and soil.

NOW, I need a mathematical formula to calculate the resistance of well,that depends on the depth of well,the size of plate, the resistivity of soil and conductive concrete , ....

can anyone help me? plzzz