PO Box 872, Custer, SD 57730 PH#: 1-605-673-3178 FAX: 1-605-673-3706 E-Mail: mintec@gwtc.net MinTec currently produces and sells high purity quartz and fused quartz sands and powders for use by the fused quartz, specialty glass, electronic, encapsulating filler, refractory and other industries worldwide. The company owns vast quartz and other ore reserves and operates numerous mines from which feed materials are generated to support MinTec's four modern production facilities located within the Black Hills of South Dakota. MinTec was formed in 1986 for the express purpose of producing high purity quartz products for use by the fused quartz and sophisticated glass industries. Since that time, MinTec has improved and expanded laboratory and plant production facilities while developing numerous new products. MinTec also developed a new proprietary technology to reprocess fused quartz cullet into high purity fused quartz sands and powders for use by the fused quartz, specialty glass and other industries. MinTec is currently in the process of improving and expanding it's fusion grade production facilities. Such expansions will enable MinTec to offer several new fusion grade products while increasing overall capacity.