Knippa Trap Rock Plant

Duane's take

The way the official marker tells it, here's how this corner of Uvalde County ended up at the center of one of the biggest operations in Texas. Sixty million years ago, give or take, volcanic lava pushed up through this ground, cooled, and hardened into something called basalt. Dark, dense, stubborn rock.

The kind that doesn't apologize for being there. Folks in the trade call it trap rock, and this particular patch of Uvalde County was sitting on a whole lot of it. Now, the man who first came poking around was M.

B. Walcott, known to just about everyone as Pete. Pete purchased acreage here about 1904, and by 1907 he'd formed something called the Genevieve Mining Co.

His intention? Gold. He was looking for gold.

And, well, the gold didn't really cooperate. Little was found, as the story goes. But what Pete and his people did turn up were substantial quantities of high quality trap rock.

That discovery set things in motion. The Texas Trap Rock Company established a quarry here about 1911, and shipments of rock started moving out in 1912. By 1914, a large, highly visible screening house had been completed.

You could see it. You were supposed to see it. And by 1919, the plant at Knippa had grown into the largest trap rock operation in the entire state of Texas, capable of producing around 100,000 tons per year.

A hundred thousand tons. Per year. Let that settle.

The company ran a spur line to connect with the Southern Pacific Railroad in nearby Knippa, so that rock could head out in every direction. Railroad ballast, decorative stone, insulation material. But its primary calling, its historic use, was paving roads.

Texas roads. And this part of Texas was helping build them. The plant and its employees didn't just work in the community.

They became part of it, woven in. And here's the detail that tells you everything you need to know about how deep that went: in 1946, Knippa High School named its football team the Rockcrushers. Not the Eagles, not the Longhorns.

The Rockcrushers. Because that's who these people were. The operation changed hands over the years.

White's Mine Company purchased it in 1968. Vulcan Materials Company acquired it in 1987. But that trap rock, laid down sixty million years before any of them arrived, just kept on being exactly what it always was.

Some things in Texas are older than the story. This is one of them.

What the marker says

Volcanic lava deposited here more than 60 million years ago cooled and hardened over time to form basalt, a dark igneous rock also known as trap rock. M. B. (Pete) Walcott purchased acreage here about 1904 and in 1907 formed the Genevieve Mining Co. to search for gold. Although little gold was found, substantial quantities of high quality trap rock were discovered. The Texas Trap Rock Company established a quarry about 1911 and shipments of rock began in 1912. A large highly-visible screening house was completed in 1914. By 1919 Knippa's trap rock plant, the largest in Texas at that time, was capable of producing about 100,000 tons of trap rock per year. The company transported the trap rock by spur line to the Southern Pacific Railroad in nearby Knippa. The company and its employees became an integral part of the community. Knippa High School named its football team the "Rockcrushers" in 1946. The trap rock operation, purchased by White's Mine Company in 1968, was acquired by Vulcan Materials Company in 1987. Trap rock has been applied to various uses such as railroad ballast, decorative stone, and as insulation material. Its historic and primary use, however, has been as a road paving material. 1994