Valles Mines, Missouri, U S A
Founded in 1749 by Francois Valle in the French Upper Louisiana before Lewis and Clark. 275 years later the Valle Mining Company's 4000+ acre property every year absorbs 21,000 tons of carbon dioxide and generates
14,000 tons of oxygen, enough to meet the needs of 63,000 people. [USDA Forest Facts]
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Site #4 - 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.