KOTA News-South Dakota Proppants and their proposed frack sand mine in the Black Hills.
Wall Street Journal-South Dakota Proppants
Conference announcement press release
Blue Bull, LLC – hydrogen sulfide process press release
KOTA News-South Dakota Proppants and their proposed frack sand mine in the Black Hills.
Wall Street Journal-South Dakota Proppants
Conference announcement press release
Blue Bull, LLC – hydrogen sulfide process press release