Nestled between the Grand View Canyon and Challis lies Lime Creek. This is a premier destination for Idaho rock collecting and offers the collector an array of quartz, agates, and zeolites. Finding this cache will put you smack in the middle of Field Trip #11 in Lanny R. Ream's The Gem and Mineral Collector's Guide to Idaho. (ISBN 1-889786-13-6).
The hillside around the cache is littered with agate and quartz, if the sun's just right the ground sparkles. Venturing just up the road a bit will bring one to the additional waypoint, looking up a canyon of volcanic breccia:
This canyon contains amazing seams of quartz, chalcedony, and agate snaking in and out of the weathered-reddish andesite and basalt. Geode-like nodules and seam agates in blues and greens can be found here quite easily. With a bit of looking one can uncover specimens of stillbite, calcite, mordenite, and even the beautiful peach-colored heulandite. Heulandite is found in less than a handful of locations worldwide and Challis is one of them! Bring a rock pick if you want to take a few specimens home--rock collecting is allowed, but hand-tools only.
The pullout to Lime Creek and road to the additional waypoint is well maintained. The land is BLM and one should expect sagebrush, cactus, and all the critters that live in the desert. The cache is easy to hike to over this terrain, under 1/5th of a mile from the road. The canyon with mineral specimens is about 2/3rds of a mile east of the cache. Bring some water and spend awhile!