2008 Pontiac G6 Rattling noise

Hi, I own a 2008 Pontiac G5 GT, there was no option for G5 so I chose G6.

I drive on gravel roads half the time and I think it has taken its toll on my car. At the front of the car there is a loud rattling like something is loose. You cannot hear it when driving on smooth surfaces like the highway. But as soon as you hit bumps and rougher roads you can hear it.

The car is fairly new but has a lot of mileage already because I used to work 60km from home and drove about 150km per day.

I would just like to get an idea of what is wrong with it and maybe get some price ranges of how much it would cost to fix. I also have warranty and am not sure if it will be covered.

Thanks I hope I was clear enough.