Old western, maybe Lee Van Clef, a group of cowboys riding horses search for gold through a canyon when the sun shines at a certain time guiding them through the canyon to the gold.

I wonder if it is this one "
Mackenna's Gold "

Hope this helps

Sure Sounds like McKenna's Gold. The sun rising behind a tall thin rock formation pointing to a path into the canyon.

Omar Sharif, Gregory Peck, Telly Savalas among others. No Lee van Cleef.