The Wall Street Mill is Joshua Tree’s most intact remaining historic gold stamp mill. Finding a stamp mill like this is rare these days, so I’m thankful it’s been preserved inside of a national park.

Owned and operated by renowned prospector and rancher Bill Keys, this two-stamp mill was a custom gold mill. Meaning that he processed gold ore in batches for local mines in the area and took a small percentage from the returns. There was never a mine here.

The mill was originally built over at Pinyon Well (also known as the Pinyon Mountain Mill) in 1891. Keys purchased the stamp mill from New Eldorado Company in 1932 and moved it from Pinyon Well to its current location. He chose this spot because it had a good source of water from a hand-dug well next to the mill. The mill includes two stamps made by the Baker Iron Works of Los Angeles, a jaw crusher, and an amalgamation table. The whole operation was powered by a twelve horsepower Western Gas gasoline engine.

The mill ran intermittently for years until the outbreak of WWII closed all gold mines as non-essential for the war effort. Bill’s son took over and operated it for a brief time starting in 1949. Bill ran the mill one last time for about a month in 1966. It was acquired by the National Park Service from the Keys estate in 1971.

Bill Keys has quite a long history around the region. One of the more famous stories involves a gun battle between Keys and a man named Worth Bagley. As the story goes, a retired lawman named Bagley moved into a nearby homestead in the late 1930s. An argument developed over access to water at the Wall Street Well next to the mill. After some time, a few of Keys’ cattle were mysteriously shot. Bagley reportedly became obsessed with murdering Keys over access to the water. Finally, in May of 1943, they had a confrontation and Keys shot and killed Bagley at the spot marked along the trail.

Keys stood trial and claimed self-defense against Bagley. He was convicted of manslaughter and sent to San Quentin. He spent five years there before being paroled in 1948 (and eventually pardoned in 1956). Once freed, he immediately returned to his ranch and resumed his old life. Keys died in 1969 and is buried on his Desert Queen Ranch.

The area around the mill has a few other items leftover from Keys’ various side projects. Near the mill, an old 1929 Lincoln Phaeton, which was converted into a truck, sits idly rusting away. Directly east of the mill and behind some trees are left-overs from Bill’s stone carving endeavors. He seemed to enjoy working stone and there is much more blockwork at his ranch.

Along the way to the mill is a windmill known as the Desert Queen Well. Excavated in 1908 by William Morgan, the well was sunk to a depth of 116 feet to reach water for the Desert Queen mine a few miles off to the east. It did not deliver water to this mill.

If you are interested in more history on Bill Keys, reserve a ranger-guided tour of Keys Ranch. Contact Joshua Tree to arrange a tour. Tours are often only available on a seasonal basis and typically cost a small fee ($10 at the time of this writing). Keys Ranch, and the area surrounding it, are otherwise completely off-limits to all public entry to protect the ranch from vandalism.

Please leave everything you find in place. It is illegal to remove anything from a National Park.


In the Barker Dam area of Joshua Tree National Park, start in the Wall Street Mill dirt parking lot. It is just east of the paved Barker Dam parking lot. You can also park at Barker Dam and a short walk east 0.3 miles to reach the Wall Street Mill dirt lot. A trail along a sandy wash connects the two.

Trail Description

The trail follows an old road northeast just passed the restroom in the dirt parking lot. Take a fork that heads north across the flat of saltbush and Joshua Trees to the pink cinder block ruins of the Ohlsone house, an early desert homestead, of which not much remains. Off the trail on the left, at 0.2 miles, is an old Dodge car.

Continue on the trail to the windmill at the Desert Queen Well. From here the trail turns northward towards the large granite boulders of the Wonderland of Rocks and the mill itself. Watch for the gravestone of Worth Bagley, carved by Bill Keys along the way.


  • Best Season: October to May
  • Region: Mojave Desert
  • Public Land Agency: Joshua Tree National Park
  • Trailhead access: 0.4 miles (0.6km) short spur dirt road from the Barker Dam parking lot to Wall Street Mill parking. Graded 2wd dirt road.
  • Hike distance: 1.6 miles (2.6 km) (out and back)
  • Trail Type: Developed
  • Hike Difficulty: Easy
  • Hike Elevation gain: +90 ft (+27 m)
  • Hiking time: 1/2 hour
  • Trailhead: 34.02797°, -116.13858°
  • Wall Street Mill: 34.03663°, -116.13398°


Trail Maps

Wall Street Mill
50 photos

Last Modified on by Guy Starbuck