Sand
Washed and screened sand for concrete, masonry, bedding, and fill. Consistent gradation, available by the load.
Quality Aggregates for South Texas
Sand, Gravel & Caliche for South Texas
Sand, gravel, caliche, and limestone available from our Rio Grande City pit and delivered across South Texas, backed by Posillico know-how and Alvarez Road Aggregates’ local expertise.
About Us
Aggregates you can build on
### Aggregates You Can Build On
Iron Rock Aggregates produces high-quality sand, gravel, and caliche from our pit in Rio Grande City, Texas, supplying contractors and infrastructure projects throughout South Texas. In addition to materials produced at our facility, we also offer limestone sourced through trusted supplier partners, providing a reliable, one-stop source for your aggregate needs.
As a joint venture between Posillico and Alvarez Road Aggregates, Iron Rock combines decades of experience in aggregates, construction materials, and heavy-civil construction. Together, we bring proven materials expertise and local knowledge to every load. Delivering consistent material, dependable supply, and a team that stands behind what we sell.
What We Offer
Our Products
From foundation fill to finished surfaces, we supply the aggregates South Texas projects are built on. Need a specific gradation or spec? Just reach out to our team.
Gravel
Gravel available in sizes from 3/4" to 4" — for base, drainage, driveways, and site work.
Caliche
Locally produced caliche for road base, building pads, driveways, and fill across South Texas.
Limestone
Quality limestone for base, surfacing, and construction applications across South Texas.
Why Iron Rock
Ask us anything — we know aggregates
From gradation to delivery, our crew brings decades of Posillico and Alvarez Road Aggregates experience in aggregates, construction materials, and heavy-civil construction to every order. Not sure which material fits your project, or need a specific spec or volume? Reach out - we'll help you spec the right aggregate and get it where it needs to go.
Find Us
Iron Rock Star Pit 1
Iron Rock Star Pit 1 626 N Alvarez Rd Rio Grande City, TX 78582
For all sales, please contact our plant manager:
Clayton Kindel
Get Started
Request a Quote
Tell us what you need and our team will get back to you with pricing and availability.