Delta Tri-Angle 2016 Issue 2 - Page 5

The SEMO team also removed the Vertical Shaft Impactor (VSI) crusher and performed a complete crusher rebuild. The crusher rebuild was a lengthy and costly process. As with any item in a rock quarry, the rock is constantly wearing out machinery and components. After more than 18 years of production and crushing millions of tons of rock, the rebuilt VSI crusher is now ready for another lengthy term of crushing rock. Another major project at SEMO Stone was the grading of the processing plant area. Over the years, daily production of two processing plants operating, side by side, had caused the yard to increase in height. With the decommissioning of the “Old” secondary plant in 2015, SEMO had an opportunity to improve the storm water drainage around the processing plant by excavating YEARS of rock build up. Careful planning was imperative, due to a buried high-pressure natural gas pipeline that runs approximately 12’ below the surface through the yard. SEMO Stone coordinated with Ameren Gas Company before the excavation started. A representative from Ameren stayed on site and monitored daily excavation. Additionally, the crew managed and maneuvered their excavation around water lines and electrical lines that feed the processing plant. In the end, the SEMO crew excavated (and eliminated) 6 feet of rock build up and was able to redirect plant storm water runoff into a containment basin. The pit crew normally assigned to run production to the Primary Crusher was SEMO Stone crew excavating overburden to uncover rock reserves. assigned the task of removing overburden from the northeast side of the quarry. This excavation opens up access to Ledge-3 for the 2016 season. An estimated 60,000 cubic yards of dirt was removed and hauled to the storage dump area. “I am proud of our team!” states Martin. “Their hard work and collaborative ideas have transformed the operation. Just saying thank you seems inadequate. The efforts are recognized and truly appreciated.” Throughout the winter projects the crews had a safety first focus before performing the work. The crews built guarding and barricades before the equipment was removed so that maintenance work could be safely accessed. This is a great example of Delta’s STOP-THINK-ASK-ACT program. SEMO Stone crew excavating the processing plant area. Approximately 6’ of rock build-up was removed. | 5