Dennis Johnson


Sunni Christon, is the HR Generalist for Martin Marietta’s Hunter Cement Plant, was hired at TXI in February 1998.  During her 19+ years of service at Hunter, Sunni has focused on relationship building among the employees at Hunter, the local communities, MSHA/the Department of Labor, and the local and national mining industry. As an integral part of her responsibilities, Sunni co-chairs the interactive Annual Training and trains new hires in safety and orientation.   She has facilitated and/or produced departmental safety meetings with a humorous twist.  

VICE President
Mary Ann Pritchard

Mary Ann is the Director of the Oklahoma Department of Mines, having served in this position for 23 years.  She has been instrumental in organizing the agency to accomplish its mandates while streamlining operations.  The agency’s programs include health and safety, land reclamation, mining and non-mining blasting, and the Oklahoma Miner Training Institute.  Mary Ann represents Oklahoma on the Interstate Mining Compact Commission, a national organization of states that work together on mining issues.  Most recently, she has served two years as a committee volunteer for the South Central Conference.

 Originally from Arkansas, Mary Ann first moved to Oklahoma to attend the University of Oklahoma in Norman.  She has 2 children and 2 grandchildren, all in Oklahoma City. 


32 years experience in mine safety and health, 10 years as a member of the planning committee for the Conference. Full-time Safety Compliance Manager for United States Lime and Minerals overseeing processing plants throughout the South Central US.

Monty Tolbert


Currently EHS Coordinator for U.S. Silica Co. Mill Creek, Oklahoma Plants. Serves as the JA Holmes President for the South Central Oklahoma Council and has been a member of the SCJMSHC Planning committee since 2012. 42+ years mining experience in Industrial Sand and Crushed Stone. 37 years experience in Mine Safety 7 Health. Married and has 6 Children and 10 Grandchildren. Enjoys outdoor activities & family.


Suzy Pate, is the Safety Training, Compliance and HR Director for Premier Industrial Services, LLC., a heavy industrial maintenance servicing contractor.  She has over 10 + years’ experience in the industry.  With an extensive background in compliance.  From the start-up of a new company’s safety program, assisting with the over-all operations, conducting safety training and orientation for new hires, annual refresher safety training for all Premier Industrial Services employees and it’s subcontractors, while maintaining compliance in all aspects of the company business.  Suzy has previously served on the conference committee and as Secretary. When Suzy’s not busy maintaining Premier’s safety and compliance, you can find her enjoying life at one of her son’s baseball tournaments or on the lake with her husband, 4 kids and 3 grandchildren. 

Walter Simpson president

Brenda Powell

Brenda Powell is the Safety/Health/HR

 Director for McGeorge Contracting’s Highway, Excavation and Concrete Divisions.  She started with the McGeorge Associated Companies in 1986 at their Granite Mountain Quarry Division in Little Rock, AR. Where she worked the first 10 years at the quarry, promoted to Executive Admin,  and has been in the Safety/Health/HR department for the past 12 years.

She has served on the Arkansas MSHA Conference Committee for the 5+ years. During the last 2 AR MSHA Conferences, she rallied the silent auction for Kids Chance of Arkansas raising record proceeds.

During 2019, assisted on the 2020 SCJMHSC sponsorship planning committee.

She has been on the Board of Directors for the National Association for Women in Construction Little Rock Chapter, member of Arkansas Asphalt Pavement Association Safety Committee, and the ACIG ( American Contractors Insurance Group) Infrastructure Safety Peer Group.

Brenda has a Degree from Arkansas State University- Beebe in Health Science.  She is an American Heart Association CPR/1st Aid/AED Instructor,  Certified MSHA Instructor, and has multiple certifications in Safety.

She has been married to her wonderful husband, Greg, for 29 years. 3 grown Children and 5 adorable grandchildren.

Her hobbies are International Traveling, spending time at their lake property, and Arkansas college sports.I am currently the safety director for Provence Recycling In Arkansas an independent contractor who performs various maintenance and production work in aggregate industry.

Walter Simpson

Walter Simpson is the Manager of Safety, Training, and Professional Development for The North American Coal Corporation in their corporate office in Dallas, TX.  With a solid background in organizational leadership, Walter has focused his career the development and training of safety initiatives.  He is skilled in design and implementation of: 1) Human Resources policy and procedures; 2) behavioral safety initiatives; 3) site specific and company-wide leadership development; and 4) effective communications.  He received his undergraduate degree from Troy University in Alabama and his Master’s in Psychology from Walden University in Minnesota. He holds certifications from the Society for Human Resources Management and the International Society of Mine Safety Professionals.  


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