Valles Mines, Missouri, U S A
Founded in 1749 by Francois Valle years before he became Commandante of the Fort of Sainte Genevieve and The King of Spain made him Don Francois Valle for saving their Fort San Carlos (now St. Louis).
270 years later as The Valle Mining Company, his 4000+ acre property every year absorbs 21,000 tons of carbon dioxide and puts out 14,000 tons of oxygen, enough to meet the needs of 63,000 people. [USDA Forest Facts]
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Site #3 - Prospecting Before MoDOT's "Hwy 67 & V Road"  Interchange Project begins.

The Valle Mines Fault

The Valles Mines Fault

The Interchange project exposed the underlying rock to a much greater degree on the northbound exit ramp of the Valles Mines exit near 3156 State Road V 63087

The drill hole logs above show a transition from surface dolomite to deep sandstone brought up by a reverse thrust fault (on the left of the arrow). Whether this sandstone has a high enough silica content to qualify as a fracking sand source will require an assay from a test lab. The old mine located on the right of the red arrow occurs back in the dolomite that ranges far to the south.