"Do you know approx. distance and direction from Tombstone airstrip?"

You could almost throw a rock.  The Atec property of that news release adjoins their old  Good Enough Silver Mine at the southeast edge of downtown Tombstone, about three blocks east of the old county courthouse on Toughnut Street.  It's about five miles northwest of the part of the airport nearest the highway to Bisbee. 

I think Google Earth will show the recent surface mining activity there.  Their work is literally on the edge of town.