The U.S. Bureau of Mines is investigating the cobalt and manganese resource of the West-Central Arkansas District through field investigations, mineralogical characterization, beneficiation and hydrometallurgical tests. Chemical analyses of head samples reported up to 25 pct mn and 0.17 pct carbon monoxide Magnetic separation yielded products containing up to 41 pct mn and 0.22 pct CO at recoveries of 95 pct and 93 pct, respectively.
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