passed through a quiet clearing.
âThis is a good place for lunch,â Rachel announced, jumping off her horse. âWe have one more steep climb before we get to the canyon.â
Nancy and George dismounted, and the three girls quickly ate a lunch of roast beef sandwiches, corn chips, and lemonade.
âEat all you want,â Rachel told them. âElsa and I fixed enough for the whole camp, and I didnât think of sending any of it back with the others. I guess I made more work for Elsa. Sheâll probably fix a second lunch for everyone now.â
âIâm sure sheâll understand, if we can solve this mystery and end all the problems at the retreat,â Nancy said. She hoped theyâd find something in the canyon to make their trip worthwhile.
The girls hurried through lunch and mounted their horses again. After a short, rocky climb the trail wound back to the stream and the mouth of a narrow canyon.
Below them the stream cascaded down a rocky slope in a series of small waterfalls. At the top of the falls a large, rocky crag stretched skyward.
âThat rock looks like a sand castle,â George said, shielding her eyes against the sun as she looked up. âIt even has little points at the top.â
âThatâs exactly what I think it looks like,â Rachel agreed. âI call it Castle Rock. It guards the entrance to Prospectorâs Canyon.â
The canyon had high, steep sides covered with trees and mountain grasses. At the bottom the stream was once again calm and peaceful. Twisted trees stood like sentries next to small, quiet pools.
Near the creek was a broken chute. Rachel explained that the chute had once been used by prospectors to wash sand.
âItâs called a sluice box,â Rachel told Nancy and Bess. âIt works just like a pan, but it can wash more sand at a time. The miners put sand in one end and let the water wash it down. Black sand and gold would catch behind the ridges on the floor of the chute. Then the miners could collect it easily.â
âIs this how Jeremiah mined?â George asked.
âNo. Whoever built this chute was a âplacer miner,âââ Rachel answered. âPlacer miners looked for bits of gold that had broken loose from the main deposit and washed down here. Jeremiah was a âhard rockâ miner. He would have searched the hillsides for the source of the goldâthe mother lode.â
Nancy got off her horse and examined the chute carefully. âIt doesnât look as if itâs been used for years,â she said. âAnd I donât see anything here that anyone would want to keep hidden.â
âMe, neither,â George agreed. âWhy do you suppose someone was so determined to keep us from coming here?â
âThere must be something,â Nancy said. âLetâs ride a little farther.â
After climbing back on her horse, Nancy let Heather lead the way along the creek. Soon the brush and trees gave way to a combination of rocks and gravel, with only a small tree growing here and there. The open hillside led up to a wall of rocky cliffs. Nancy immediately spotted several fresh holes in the graveled soil.
âSomeoneâs been digging!â Rachel exclaimed.
âLook how the holes seem to make a pattern on the hillside,â George added. âThey make rows, both up and down and across.â
âAs if someoneâs looking for something and following a pattern to cover all the ground,â Nancy said.
She tied Heatherâs reins to a tree and walked up the hillside. The holes were about two feet deep. She was soon joined by Rachel and George.
âDo you know what weâre looking for?â Rachel asked.
âNo, but thereâs got to be something more here,â Nancy replied. âIâm sure of it.â
She was searching through a thick growth of bushes near one of the holes when she caught a glint of metal. Carefully