4 intense glowing green "Stop-light" type orbs holding tight diamond formation. Not Fireworks...

4 intense glowing green "Stop-light" type orbs holding tight diamond formation.  I just left home on my way to driving 35 miles to SLC to a radio station(I was a late night DJ and needed to be there by 12:30 am).  When driving eastbound on south end of town, I spotted the 4 described orbs hovering maybe 1000 feet over the Oquirrh mountains (approximately directly over Kennecott Open Mine Copper Pit).  I pulled the car over and assured myself I wasn't seeing a reflection on the inside of my window.  (I moved to various areas of the window, and also rolled down my window and looked outside, the orbs remained stationary).  Even though this was 4th of July, these were definitely not fireworks, as the tight formation hovering continued for somewhat over a minute.  Then the orbs flew in tight formation in a very horizontal direction to the north, following the mountain range.  Apparently the orbs were either in the mountains or in the Salt Lake Valley, because as they flew northward at an extreme speed, they dissapeared behind the mountain range.  I am unaware of any reports on this, but I was on my way to a radio station and broadcasted my sighting on-air and requested further reports to be called in.  I didn't receive any comments, so I may have been the only one who saw this.