• Various grades of processed perlite

Cornerstone Industrial Minerals operates an open pit perlite mine within a unique weathered rhyolitic dome deposit occurring from a single volcanic event in south central Oregon USA.

Traditional rock drilling, blasting and jaw crushing mining methods produces 3/4 inch ore feed for further mill benefaction into multiple target industry designated and custom expanded sizes to achieve desired expanded product sizes.

Cornerstone perlite ore exceeds typical industry and commercial standards for furnace expanded densities, particle sizing and volumetric production yields.

Bulk rail deliveries via a company operated trans-loading terminal to service customers throughout North America and ocean terminal export.