Lost California Treasure

Goose Egg Mine

Rooted in the early excitement of the 1848 California Gold Rush, the legend of the Goose Egg Mine began when a lone prospector reportedly discovered a highly concentrated placer deposit in Mosquito Valley that yielded massive, smooth gold nuggets the size of goose eggs. The prospector hid his discovery but was unable to establish a permanent claim before losing the location in the dense brush of the canyon. Over the decades, generations of searchers have scourged the draws, ravines, and creeks downstream from Newtown, looking for the source of these legendary nuggets. Despite modern attempts to locate the vein by hiking past old tailing piles near Weber Reservoir, the mother lode remains completely lost.

Record typelost mine
LocationEl Dorado County, located in the historic Mosquito Valley, downstream from Newtown and Placerville.
Probability indexLow
Land statusEldorado National Forest / Private Property (Allowed with active claim checking)
Research coordinates38.7308, -120.7410
SourceMines, Murders and Grizzlies by Charles F. Outland / Calexplornia Mines

Field Research Notes

Mosquito Valley is characterized by steep ravines and dense vegetation, with a patchwork of public US Forest Service land and private residential parcels. Hobbyists must perform thorough claim-checking via the BLM's LR2000 system before doing any prospecting, as active claims cover much of the region.

Recommended Gear

Gold Pan, Sluice Box, Crevice Pick, BLM Claim Maps

Related lost mines

  • The Lost Cabin Mine lost mine · Trinity Alps Wilderness Area, Trinity County · Low probability

    In the autumn of 1850, three prospectors named Cox, Wood, and Buck followed the Trinity River up into the rugged headwaters. Near a waterfall, they found a rich gravel bed loaded with heavy gold nuggets. They.

  • The Lost Cement Mine lost mine · Near Mammoth Lakes, Mono County · Low probability

    In 1857, two miners wandering lost in the Eastern Sierra discovered a vein of rich, red volcanic cement-like rock that was packed with pure gold. They chipped off a few pounds of the rock, showing it to others when.

  • Waterfall Mine lost mine · Shasta County, located in the rugged mountainous backcountry approximately thirty miles up a tributary of Cow Creek, potentially near Bear Canyon. · Low probability

    In the early 1850s, a small party of prospectors from the East Coast traveled into Shasta County, crossing near Cow Creek and Fort Reading, and followed a rugged stream thirty miles into the high mountains. There, they.

  • Great Blue Lead at Forest City and Bald Mountain lost mine · Forest City and Bald Mountain drift-mining country, Sierra County, northern Sierra Nevada · Medium probability

    Forest City and the Bald Mountain drift mine sat on the famed Great Blue Lead, a buried auriferous channel that drove some of Sierra County's most persistent lost-channel speculation. Historical accounts describe the.

  • Empire Mine State Historic Park lost mine · 10791 E Empire St, Grass Valley, Nevada County · High probability

    One of the oldest, largest, deepest, and richest hard-rock gold mines in California. Operating for over 106 years from 1850 to 1956, it produced 5.8 million ounces of gold from 367 miles of underground passages.

  • Malakoff Diggins State Historic Park lost mine · North Bloomfield, Nevada County · High probability

    California's largest hydraulic gold mining operation. Blasted away entire hillsides, excavating over 41 million cubic yards of earth and carving out a massive canyon. The resulting environmental devastation led to the.