The Bag full of gold coins was an item that could be snatched from the enemy known as the Lone Miner with the use of the whip. If Carnby no longer carries the single gold bullet, he can still kill the Lone Miner with a gold bullet, by he can use the whip to get this item. Carnby can then use them into , and then reload them into his gun in order to defeat him with gold bullet.