Can you? please help

can you Rotate a gold mine?

with model editing you can but thats a big waste of time :D

Otherwise no

Well, I guess you could make the gold mine a custom unit with 0 move speed and give it the gold mine abilite

But you could still move it. The minimum unit speed is .01 Use the "Pause Unit" trigger.

If you use the Trigger
"Create Unit Facing Angle"

Then you could probably create a gold mine facing a different angle after the map starts. I haven't tried it for gold mines in particular, but I have used it to create other buildings and it worked fine.