How to install a heavyweight barn beam as a fireplace mantel?

I have received an old hand hewn barn beam of white oak I want to attach to studded drywall above a gas fireplace. The beam is 10" x 6" x 6' and weighs in excess of 135lbs.What would be a good way to anchor this to the wall with preferrably nothing showing? The weight, obviously concerns me. I plan on... show more I have received an old hand hewn barn beam of white oak I want to attach to studded drywall above a gas fireplace. The beam is 10" x 6" x 6' and weighs in excess of 135lbs.What would be a good way to anchor this to the wall with preferrably nothing showing? The weight, obviously concerns me. I plan on using a stone veneer around the mantel once it is installed.
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