The Thunder Eggsof Central Oregon

The Palouse River gives up its agates only at certain water levels — too high and they're buried in silt, too low and the exposed gravel has already been picked clean by every other rockhound who woke up early that week. I've learned to watch the USGS gauge at Hooper and drive out when it drops below 3.2 feet.

The best material is always under the cut banks where the current slows and drops its cargo. Carnelian-banded fortification agates, some with plume inclusions, all worn smooth by the river's long patience. I fill a five-gallon bucket and spend the drive home listening to them knock together in the dark.

The tailings pile outside an abandoned silver mine isn't where you find silver. It's where the miners threw everything they didn't want — which is almost always everything a rockhound does want. Fluorite, quartz crystals, occasional wulfenite plates still clinging to their host rock. You're sorting through someone else's waste and finding treasure.

The Bureau of Land Management maintains a list of claims that have been abandoned for more than 10 years, and most of the Mojave's old workings fall in that window. Check the list, check the GPS coordinates against current satellite imagery for any new activity, then drive out at first light when the low sun throws every crystal's shadow across the dump. You'll see things you'd miss at noon.