"To be sure we'll be careful, Benson," answered Darry. "There'd be no fun in getting hurt—even if we did locate a gold mine."

"You won't find any gold mine here. This ground was prospected years ago—before even the fort was located. I came out here once myself, with a miner named Hooker Brown. Hooker was dead certain there was gold here, but although we stayed here about two weeks nosing around we never got even a smell of the yellow metal."

"Well, we'll have a look around, anyway," said Joe. "But we must get good torches first."

Pine knots were procured and lit; and, with another caution from the scout to be careful, they set off, leaving Benson to care for the horses and prepare such an evening meal as their stores afforded. Luckily the scout had brought down half a dozen good-sized birds, and these he now prepared to broil in true hunter style.

The front chamber of the cave was somewhat semi-circular, and behind this were several other irregular apartments, running down to a passageway which wound in and out between jagged rocks almost impossible to climb or explore in any manner. At a distance could be heard the trickling of water, but where this came from, or where it went to, nobody in the cave could imagine.

The boys advanced from one opening to another with care, one with his torch held high, that they might see ahead, and the other with the light close to the ground, to warn them of a possible pitfall.

"A regiment of soldiers could quarter in here," observed Darry, as they pushed on. "What a defense it would make!"

"An enemy could fire right into the entrance. And, besides, supposing the enemy started to smoke you out? I can smell the smoke from the camp-fire away back here."

At last the two boys reached the passageway back of the rear chamber, and here came to a halt. The dropping water could be plainly heard, and Joe flashed his torch in several directions in the hope of catching sight of the stream.

"I'm going to climb the rocks," he said, after a pause. "Perhaps there is another opening behind them."