(Bolded by me)
I haven't seen a complete overhead that shows the gravel pit being dug up in relation to where it was from the home. There are several pictures online of close-ups of the gravel pit while they were digging, but they are all zoomed in on the pit. My "guess" would be it must be on the southeast side somewhere, because in the video below you do not see the gravel pit in the overhead farm pictures, but you do see the whole main home, farm buildings and crops directly around the home. They also show digging up the farm pit, but not in relation to other buildings on the farm.
This video has some different angles of the farm, shows them digging, has snippets of that early interview with DR (with his face blurred out), and has the news story about some parents objecting when DR was going to start teaching music at St. Boniface school in Cold Spring, MN. (The school decided to place a paraprofessional in his class to assist, who was later removed.)
http://www.immelman.us/news/dan-rassier-teaching-concerns/
This other link to Immelman's website contains several videos; Sheriff Sanner on results of the 2010 search so far; DR's interviews with Julie Nelson, etc.
http://www.immelman.us/news/jacob-wetterling-latest-news/
From the Immelman site.
Rassier has taught band and music in the Rocori school district, which includes schools in Cold Spring, Rockville and Richmond. He is also a former volleyball, basketball and softball coach and advised the yearbook for the district. Efforts to reach Rocori administrators Friday were unsuccessful.