You don't want to take the road from Calico Rock to Mt Olive.  Your map APP may send you that way, but it is a gravel road with low clearances.  Only travel to Mt Olive Mercantile from Arkansas Highway 9. 

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Watch for this sign on Hwy 9 North toward Melbourne (at 8 miles) or Hwy 9 South toward Sylamore/Mountain View (at 10 miles).  We are 4.6 miles on the left down the Mt Olive Road.