U.S. Silica's Pacific plant mines 98.8% whole grain silica sand from the St. Peter's Formation. The physical properties of the Pacific products make it effective in flat glass, glass containers, chemical, foundry, and the oil and gas industries.

Our surface mines at the Pacific facility use natural gas and electricity to produce whole grain, ground and fine ground silica through a variety of mining methods, including hard rock and hydraulic mining. Since acquiring the facility we renovated and upgraded its production capabilities to enable it to produce multiple products through various processing methods, including hydraulic sizing, fluid bed drying, grinding, dry screening, classifying and microsizing.

Mining operations have been conducted here since the early 1900s. Some of the initial material mined at this site was used to build the famous Route 66, which fronts the plant. In 1924, Pioneer Silica Products purchased a 205-acre tract of land and began mining underground. The underground rooms from this mine remain intact today and are used as storage and access. 

The facility is located approximately 50 miles southwest of St. Louis and is accessible by major highways including U.S. Interstate 44. 


Pacific employees are encouraged to volunteer their time and talents in community activities, trade associations and business forums to facilitate a relationship of stewardship within the communities they call home.


Delivery & Logistics

By Truck

Our truck loading times are as follows:

Bulk:  Sunday - Friday, 11 AM - 11 PM

Bagged:  Monday - Friday, 7 AM - 2 PM


Ground: Bulk / Bulk Bags

Fine Ground: Bulk / Packaged (50# bags) / Bulk Bags

Driving Directions

From Airport

Take I-70 West 3 miles to I-270 South (Exit 232).  Stay on I-270 South for 15 miles to I-44 West (Exit 5).  Stay on I-44 West for 15 miles to Allenton Six Flags Exit (Exit 261).  Turn left at the base of the exit ramp.  Go under the Interstate.  Turn right at the light (Business Loop 44). The plant is 3.5 miles on the left.  Enter gate beyond U.S. Silica sign. The office is on the left.


Careers at US Silica

Our Employees Are Our Most Valuable Asset

When you join the U.S. Silica team, you become a part of a resilient, dynamic culture. We're proud of our 100+ year legacy of doing things right, as we focus on the next 100 years by helping the communities where we live and work thrive.

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