I live in house that was build in the 1700's,  colonial coins found with DFX at 6 or 7 inches but can't go any deeper.  I know there are older items at 11 and 12 inches because i have dug horse bells and horse shoes at this depth.  I still can't seem to find coin size items at this depth, need program for N.Y. state
	
		
			
		
		
	
				
			 
						
					 
 