What could Dav Kaufman's UFO be?

[flarkey]

Why did you use a target height of 150ft?

It was a rough guess of the height of the buildings at the mine.

 

[fizzBuzz]

It seems this facility is very close to the horizon from the observation point, or just below and we're seeing refracted lights. But it looks like we have a likely explanation.

 

[jarlrmai]

Wow. Broken Arrow was an old TV show I watched as a kid. You never know what my stutter will bring up.

Broken Arrow is the code name used for a missing nuclear weapon or accidental nuclear explosion by the US military as well and there was a John Woo movie based on that premise with the same name.