Knox Mine Disaster
Jenkins Township, Luzerne County, Pennsylvania
Marker Inscription
On January 22, 1959, twelve men died in a tragic accident at the River Slope Mine near this site. The mine had been illegally excavated beneath the Susquehanna River at the direction of the Knox Coal Company. When the force of the ice-laden river broke the thin layer of rock, over ten billion gallons of water flowed through this and other mines. This disaster ended deep mining in much of the Wyoming Valley.
Erected by Pennsylvania Historical and Museum Commission
The Story
On January 22, 1959, the anthracite fields of the Wyoming Valley met their reckoning when the Knox Coal Company's illegal mining beneath the Susquehanna River breached the riverbed. More than ten billion gallons of icy water poured into the workings, killing twelve men and effectively ending deep mining across much of the valley.
Why it matters
The Knox Mine Disaster stands as a grim monument to the human cost of unregulated coal mining and marks the collapse of the anthracite industry that had built northeastern Pennsylvania.
The story behind this marker
AI contextThe era
For more than a century, the Wyoming Valley of northeastern Pennsylvania sat atop one of the richest deposits of anthracite—hard coal—in the world. This is the coal that heated American cities, fired the furnaces of the Industrial Revolution, and drew waves of immigrant families into the mining towns strung along the Susquehanna River. Around Wilkes-Barre and Pittston, whole communities grew up over a honeycomb of tunnels that reached deeper and farther underground with every passing decade.
By the late 1950s, though, the anthracite boom was fading. Oil and natural gas were replacing coal in America's homes and factories, and the industry that had defined the valley was under pressure to squeeze profit from thinning, harder-to-reach seams. That pressure is the backdrop to what happened here in January 1959. Miners were being pushed to dig where the easy coal was gone.
Winter made the danger worse. In January the Susquehanna runs high and cold, choked with ice, and this stretch of river flowed directly above the workings that fanned out beneath it.
People & events
On January 22, 1959, crews were working the River Slope Mine, part of a network of tunnels operated under the direction of the Knox Coal Company. To reach coal, the company had driven a section of the mine illegally beneath the bed of the Susquehanna River, leaving only a dangerously thin ceiling of rock between the miners and the water overhead.
That morning the roof gave way. The ice-laden river tore through the breach, and an almost unimaginable volume of water—more than ten billion gallons—came roaring down into the mine and the tunnels connected to it. In the flood and its chaos, twelve men lost their lives.
Rescuers raced to plug the hole in the riverbed, dumping railcars, culm, and debris into the whirlpool where the Susquehanna was pouring into the earth. The story of the disaster is inseparable from the corners that were cut to reach the coal beneath the river—the reason the marker names the illegal excavation so plainly.
Its place in the American story
The Knox Mine Disaster is remembered as the event that effectively ended deep anthracite mining across much of the Wyoming Valley. When the river flooded the interconnected tunnels, it drowned not just one mine but a whole underground system that could never be fully pumped out and reopened. Thousands of mining jobs vanished, and the region's economy was forced into a long, painful reinvention.
It also became a landmark in the American argument over industrial safety and accountability. A disaster caused by mining where the law forbade it—directly beneath a major river—stood as a stark example of what can happen when production is allowed to outrun regulation and the people underground pay the price.
In that sense the site speaks to a story much larger than one valley: the human cost of the fuel that powered the nation, and the reckoning that came when an industry's shortcuts finally caught up with it.
If you visit
Stand near this site in Jenkins Township and let the geography tell the story. The Susquehanna River is the whole point—the water that broke through was flowing right above the men who died. Picture that thin roof of rock, and the river's weight pressing down on it.
The memorial marker is a quiet place, not a spectacle. It rewards a slow read and a moment of reflection for the twelve who never came up. This is coal country, so look around at the surrounding towns and hillsides and imagine them in their working heyday, alive with the culm banks, breakers, and rail lines of a booming anthracite region.
It pairs naturally with a broader tour of the northeastern Pennsylvania coalfields around Wilkes-Barre and Pittston, where the history of hard-coal mining is written into the landscape. Come to understand not just how the coal came out of the ground, but what it cost—and why deep mining here came to an end on a single winter morning.
Written by AI to add context, grounded in the marker’s inscription and the historical record. The inscription above is the original, unaltered text.
Own a business near here? Add it to the map.
Related events
- · Knox Mine Disaster
Themes & tags
Nearby & related markers
Workers in Greater Pittston's Garment Industry
Pittston, PA · est. 2006
From the 1930s through the 1980s, the mills of Greater Pittston stitched the region into a national center of clothing manufacturing. Thousands of workers, most of them women, ran the sewing floors, and their membership in the International Ladies' Garment Workers' Union won higher wages, safer workplaces, and stronger employee rights. The ILGWU became a force in the civic and political life of Pennsylvania.
Twin Shaft Disaster
Pittston, PA · est. 1992
On June 28, 1896, a massive cave-in of rock and coal in the Newton Coal Company's Twin Shaft Colliery killed fifty-eight men in an instant. A commission appointed by the governor investigated and issued safety recommendations that September—advice that would too often be ignored. The tragedy hardened the resolve of anthracite miners and helped fuel the region's turn toward stronger unions under John Mitchell after 1900.
Old Forge
Old Forge, PA · est. 1947
In 1789, in the years just after the Revolution when the new republic was pushing industry into its river valleys, Dr. William Smith and James Sutton built an iron forge on the south bank of the Lackawanna River. It was the earliest forge in this corner of northeastern Pennsylvania, tapping the region's water power and abundant ore long before anthracite coal made the Lackawanna Valley a national industrial powerhouse. The little settlement that grew up around the works took its name from the forge itself, and the name Old Forge stuck long after the hammer fell silent.
Baltimore Mine Tunnel Disaster
Wilkes-Barre, PA · est. 2014
On June 5, 1919, disaster struck beneath the anthracite fields near Wilkes-Barre when a fallen trolley wire touched a cart carrying miners along with kegs of blasting powder, triggering an explosion and fire in the Baltimore Mine Tunnel. Ninety-two men were killed and sixty injured, making it one of the deadliest industrial catastrophes in Pennsylvania history and drawing international press and labor attention. A U.S. Bureau of Mines investigation followed, leading to a ban on hauling miners and explosives in the same rail car.