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The Millington Quarry property in the Millington section of Bernards Township is one of the largest former industrial sites in Somerset County and has been the focus of redevelopment discussions for more than a decade. Covering approximately 180 acres along Stonehouse Road, the site operated for many years as a trap rock quarry before mining ceased. As quarry operations wound down, plans shifted toward reclaiming the land and finding a new use for the property. Early proposals envisioned a scenic lake surrounded by luxury homes, while later township-led redevelopment plans expanded the concept into a mixed-use community featuring housing, retail shops, restaurants, a hotel, offices, walking trails, public parks, and a 50-acre lake.
Millington Quarry
The Millington Quarry was far more than a source of crushed stone—it became one of New Jersey’s most scientifically significant geological discoveries. Opened in 1895, the quarry was developed to extract the exceptionally hard trap rock of the ancient Hook Mountain Basalt (Third Watchung Mountain). For more than a century, millions of tons of this durable volcanic rock were blasted, crushed, and used as railroad track ballast, road stone, concrete aggregate, and other construction materials throughout the Northeast. The quarry often produced more than one million tons of stone each year, helping build the region’s transportation infrastructure.
Hidden within that same basalt, however, were thousands of mineral-filled cavities formed nearly 200 million years ago when gas bubbles became trapped in cooling lava flows. Over millions of years, mineral-rich groundwater filled these cavities with an extraordinary variety of crystals, attracting geologists and collectors from around the world. Research conducted at Millington Quarry fundamentally changed scientists’ understanding of how minerals formed within the Watchung Mountains, demonstrating that mineral-rich groundwater actively circulated upward through the basalt rather than forming in a stagnant underground environment. Although the mineral-bearing rock has now been completely quarried and the site is being reclaimed for residential development, Millington Quarry remains an important chapter in New Jersey’s industrial and geological history—its trap rock helped build the Northeast, while its hidden minerals advanced the scientific understanding of one of the state’s most remarkable volcanic landscapes.
Millington Quarry Incorporated (MQI) had long been owned by township resident Gary Mahan and his brother, Roger Mahan, whose family acquired the quarry property in 1978. The land was recently sold for $17.45 million to CIP Stonehouse Redeveloper, LLC.
The 179-acre site has been targeted as a mixed community with affordable housing to be built on what is now a former active quarry. It has been controversial for years since contaminants were found in the soil put there as fill over the last decade. The proposed development prompted the “Stop the Quarry Plan,” in which township residents opposed the effort.
Following a March 2019 meeting, Michael Lavigne, an attorney representing Millington Quarry, said there would be “no furtherance of a development plan” by the subdivision of the quarry property. He added that the quarry had a potential buyer for the entire property. But the deal eventually fell through.
In July 2023, it was announced that the Millington Quarry site had been sold again. The township’s largest available tract was sold to CIP Stonehouse Redeveloper, LLC. David Placek was a partner in Community Investment Partners (CIP), which proposed a redevelopment plan for the quarry that the Township Committee rejected five years ago (above). Zoned for two-acre housing, the site has a conceptual plan that ultimately calls for a 33-acre lake, with 40 to 50 homes to be built to the south. The contamination of $3.5m bonds remains in full force and effect as the rehabilitation is incomplete and will remain so until the new owners post an equivalent amount of security.
Based on our internet searches, there has not been any significant news announcing groundbreaking, home sales, or construction at the site. The property remains in its long-term redevelopment phase rather than active residential build-out.
