If we're talking guns that I own, then probably either one of my Ruger GP-100s in .357 mag, or my S&W M69 in .44 mag. If I can choose anything, I think I might like a Ruger New Model Blackhawk in .41 Magnum (in Fantasyland, ammo would be both cheap and plentiful).
Oh, and the pan would definitely be steel. That'd be more in keeping with the whole 49er miner thing, plus I could cook in it, or even use it as a reflective device should I need rescuing.