As someone who has had horrible experiences with the chest room before, don't even try it. You're far from ready to face the golem.
Also, I think the material of said golem changes each playthrough or I'm just not sure what it's made of. One thing's for certain though, it's pretty powerful and will easily kill you if you're just getting out of UT. I say using anything ranged or a mine or two will easily help but might risk damaging the loot in the chest due to the blast radius. So I guess try and lure it to you and into a man made mine field to easily dispatch it.
Trust me, you do not wanna get into a one on one melee fight with it. Especially if you're just getting out of the UT