Our Story

Since 1936, Meckley’s Limestone Products, Inc. in Herndon, Pennsylvania has been a leader in the limestone processing field, and has been providing pulverized sorbent to the power industry since CFB technology was introduced in the United States in 1982. Founded by the Meckley family, Greystone was formed to function as a development arm, and has taken the lead of this very specialized core competency since its organization in 1993.  Since then, projects have been developed to produce specialty mineral projects from limestone, feldspar and quartz resources.


The Colver Project

Colver Limestone Processing Facility

Colver Limestone Processing Facility

Functioning as designer, builder and owner/operator for on-site limestone pulverizing facilities, Greystone’s first installation was completed at the Colver Power Facility in Colver, Pennsylvania. Requirements for this project included building the pulverizing facility, negotiating the raw sorbent contract for the power project, providing operating services and managing the raw sorbent purchasing and delivery.

Colver - A Success Story

"Project of the Year" presented by Power Engineering/Power Engineering International

"Project of the Year" presented by Power Engineering/Power Engineering International

The project supplies electricity to the Pennsylvania Electric Company (Penelec) and has an availability greater than 98 percent, which makes it one of the most reliable producing generating plants of its kind anywhere in the world.

Selected over projects worldwide, Colver received the award for providing the most outstanding economic, social and environmental benefits to the power plant owners and their customers. This project was Greystone's first installation, and we are proud to have been recognized in this achievement.

Greystone Materials has demonstrated flexibility, resourcefulness and in-depth technical knowledge in their conceptualization, design, construction and startup & operation of the facility adjacent to the Colver Power Project. It’s great not having to worry about their product, pulverized limestone, always being available for the project when needed.
— Jim Ansell, General Manager, Inter-Power/AhlCon Partners