"Well, it won't do any harm to look around here, anyway," returned Dave.
They had to proceed with great care, for in spots the water was still running over the rocks and the footing was very slippery. They had a rope with them and all took hold of this, Dave being in front, Phil coming next, and Roger bringing up the rear.
"It's not such an easy job as I thought it would be," panted Phil, after they had made an unusually difficult turn of the ledge. "It kind of takes the wind out of a fellow!"
"Let us rest a bit," suggested Dave. "We can't go much further along the ledge anyway," he added, looking ahead.
They had reached a point where the outcropping of rocks had split in twain, forming the ledge they were on and another ledge twenty or thirty feet away. Between the two ledges was a hollow with jagged rocks far below. The other ledge wound around another hill, leading to the northwest.
"This certainly is a wild country," said Roger, as the boys seated themselves on the inner side of the ledge. "Hunting for gold and silver in a place like this is certainly not easy. Think of spending month after month among rocks like these, looking for 'pay dirt' or 'pay rock,' as they call it!"
"And yet it just suited your uncle," returned Dave, "and it suits Abe Blower and Mr. Dillon."
The boys relapsed into silence, glad of the rest. Dave was thinking of his father, and of the folks who had gone into Yellowstone Park, when suddenly he felt his sleeve pulled by Roger.
"Look!" whispered the senator's son. "Don't make any noise, either of you!"
He had pulled Phil's sleeve also, and now he motioned for his chums to crouch down behind the rocks on which they had been sitting, stones that lay loosely on the ledge, close to the towering cliff.