Cadre Proppants is a proud manufacturer of hydraulic fracturing sand used for the production of oil and gas wells. Located on 1,000 acres in Voca, Texas, Cadre�s new state-of-the-science facility is the largest single-line proppant plant in Texas. Our operation is a combination of open-pit mining and a series of processes which include crushing, cleaning, sorting, shipping, and storage. It is a 24-7 operation that employs nearly 100 employees.