Otto Mine, Gillham, Sevier Co., Arkansas, USA
Ref.: Rocks & Min.: 63:123; Howard (1979). An antimony mine located 2 miles SSW of Gillham. This was the first discovery of antimony in Arkansas. Ore is quartz veins in shale. Started 1877 and closed 1888, reopened 1941 and further explored in 1951. Workings feature 2 shafts with extensive underground workings.
| 'Chlorite Group'|
| Roméite Group|
9 entries listed. 7 valid minerals.
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