How a 988-ton monster machine from New York created Idaho’s strangest landscape

Silas Mason Company’s Million-Dollar Gold Dredging Failure

In 1939, as the Great Depression dragged on, the Silas Mason Company bet big on Idaho gold. They picked Yankee Fork valley, thinking they’d pull $11 million from a 5.5-mile claim. The tiny town of Stanley, just 22 miles away, soon buzzed with trucks hauling parts for a massive 988-ton dredge.

Built in just five months, this metal beast ran day and night with only three men per shift. It chewed through rock and mud until 1952, but dug up just over $1 million in gold at a cost of $1,076,100.

The mighty dredge and its five-mile trail of rock piles still stand in the Idaho wilderness, waiting for you to discover its Depression-era story.

New York Company Bet $11 Million on Idaho Gold During Depression

The Silas Mason Company from New York went hunting for gold in 1939, while most Americans struggled through the last years of the Great Depression.

After checking several spots, they picked the remote Yankee Fork valley in Idaho, thinking they could get about $11 million in gold from a 5. 5-mile stretch.

The tiny town of Stanley, 22 miles from the dig site, became their vital link to the outside world as the closest place with basic services.

Engineers Built a Monster Machine to Chew Through Mountain Streams

Silas Mason hired the Bucyrus Erie Company to build a gold dredge tough enough for the rocky Yankee Fork terrain. The result was a 988-ton floating machine made just for this job.

They built the buckets smaller than usual but extra strong to handle the hard ground and big rocks. The finished dredge was 112 feet long, 54 feet wide, and 64 feet high.

It used 71 eight-cubic-foot buckets, each weighing over a ton.

Stanley Became the Gateway for Tons of Mining Equipment

Every piece of the huge dredge came by train to Mackay, Idaho, then by truck through Stanley and over rough mountain roads. The town served as the last supply stop before the final push to the work site.

Workers built the pontoons and upper structure in Boise, then hauled them through Stanley and over the dangerous Galena Summit.

The job meant moving twenty-five pontoons, each 10×10×27 feet, across mountain passes with barely proper roads.

Workers Built a Pond in the Mountains to Float a Factory

Work crews started on April 1, 1940, and finished just four months later on August 24. They first created an artificial pond big enough to float the nearly 1,000-ton machine during assembly.

Building such a massive structure in a remote mountain spot meant solving problems far from town. The pond needed 8-10 feet of water to float the dredge once running.

Workers put together the giant puzzle through spring and summer until the strange floating factory was ready.

The Gold Dredge Ran Day and Night with Just Three Workers

After starting in August 1940, the dredge worked 24 hours a day with just three men per shift keeping it going. The bucket line system constantly scooped up streambed material, with each bucket weighing more than a ton.

The machine could dig 35 feet below water and needed 11 feet of water to stay afloat. People could hear the dredge from two miles away as it rumbled through the valley.

Families Created a Mini-Town Next to the Dredge

Most workers and their families lived at Dredge Camp, a group of log cabins, bunkhouses, and a cookhouse built just for them. Some rented cabins in nearby ghost towns like Sunbeam and Bonanza.

With Stanley too far for daily school trips, the company set up a school right at the camp. Thirteen kids from pre-school through eighth grade took classes there.

The remote spot forced the mining community to create its own little town with all the basics.

World War II Stopped the Gold Hunt Cold

The dredge shut down in October 1942 when World War II changed national focus away from gold mining. The huge machine sat unused in the mountains for almost four years during the war.

Workers joined the military or found jobs supporting the war effort. When work started again in 1946, the company soon hit money problems.

By 1947, the Snake River Mining Company put the dredge up for sale, saying they couldn’t make enough profit.

Potato King J.R. Simplot Took a Chance on Mountain Gold

Idaho businessman J. R. Simplot and his partner Fred Baumhoff bought the dredge for $75,000 in 1949, hoping to make it pay off where others failed. They got it running again in April 1950 with fresh management.

After finishing the original 5. 5-mile claim, they leased more land on the Morrison property to keep digging.

The dredge kept eating through the streambed until 1952, when their lease ran out.

The Final Move Left the Dredge Stranded Forever

In 1953, the Morrison property owners told Simplot to either move the dredge or pay rent to keep it on their land. Crews started the machine one last time, just long enough to move it to its final spot.

After reaching its current location, they shut it down for good.

From 1953 to 1966, vandals stripped away valuable equipment and anything they could sell from the abandoned dredge.

The Gold Dredge Made Less Money Than It Cost to Run

During its working years, the dredge processed 6,330,000 cubic yards of stream gravel. All that work produced $1,037,322 in gold and silver, but the operation cost $1,076,100 to run.

They lost money. The dredge left behind five miles of tailings, piles of rocks and gravel that completely changed how the Yankee Fork looked.

The rocky debris fields created a moonscape along the valley that remains clearly visible today.

Volunteers Keep the Dredge’s Story Alive for Tourists

J. R. Simplot donated the dredge to the U. S. Forest Service in 1966, saving it from being scrapped. The Yankee Fork Gold Dredge Association formed in 1980 to preserve the machine and share its story.

Volunteers now run tours from Memorial Day through Labor Day each year.

Mining experts consider it one of the best-preserved bucket-line gold dredges in the lower 48 states.

The massive machine stands as a monument to Depression-era mining ambition, showing visitors how far people would go to find gold in Idaho’s remote mountains.

Visiting Sawtooth Hotel, Idaho

The Sawtooth Hotel at 755 Ace of Diamonds Street offers authentic mountain lodging where you can learn about Stanley’s history as a supply hub for gold mining operations.

The on-site restaurant serves northwest comfort food Thursday through Monday from 5:00 PM to 9:00 PM (closed Tuesday and Wednesday). You’ll get free wifi and parking.

For groups of six or more, call 208-721-2459 or 208-774-1040 after 3:30 PM to make reservations.

This article was created with AI assistance and human editing.

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