Red Wing area could be a hotbed for industrial sand

Near the muddy banks of Hay Creek, a popular trout stream, are significant bluffs covered with a hardwood forest of oak, bass wood and black cherry trees.

Underneath the forested land is an increasingly valuable resource called "frac sand," highly sought after for its size and strength. With perfectly round grains that look like brown sugar crystals, the sand is ideal for the oil and natural gas exploration industry, which uses it to extract fuel from underground rock in a process called hydraulic fracturing, or fracking.

Listen to story at Minnesota Public Radio.