Help needed to ID. a hunk of Silver

[wmvanrock]

I found these in the farmers field. Metal detector pegs all the way on the silver scale and magnet does not stick to it. The biggest piece is about 6"X3" and is very heavy. Thank You!

 

[galenrog]

Looks a lot like lead.

 

[Eu_citzen]

A streak test might help.

 

[wmvanrock]

Its very hard and I tried to make a steak on a ceramic cup...no luck! It also conducts electricity and has smaller rocks in it. Thrsr rocks are silver looking.