Distant surveillance camera

We have a unique situation.  The area where we are experiencing our theft is about a mile from our home.   We have a pump in the river than provides irrigation water to our property.  There is about 50 yards of copper wire that connect the pump to the power source and that wire has disappeared.   Some of our neighbors have lost theirs up to three times.   We need a outdoor security cameras that could provide a record of anyone in the area after dark and when motion is discovered transmit an alarm signal to our home.   Once the alarm rings we could call the sheriff to investigate.