Ref.: Rocks & Min.:63:108; Scull(1959); Brobst, D.A. (1958), Barite Resources of the United States, USGS Bull. 1072-B: 94-95; Parks (1932).
A barite mine located 2½ miles NE of Magnet Cove and featuring a large open pit and underground workings. Owned by Magnet Cove Barite Corp. and National Lead. Started 1939 and closed 1977.
Bedded barite deposit in a synclinorium in the southern part of the Ouachita Mojuntains known as the Mazarn basin that is about 10 miles wide and 60 miles long in parts of several counties. The Magnet Cove deposit is at the east end of the basin in the synclinal valley of Chamberlain Creek about 10 miles NW of Malvern.
These deposits occur principally near the base of the Stanley shale of Mississippian and Pennsylvanian age. Most of the barite is found in the Mississippian part of the Stanley shale.
The Magnet Cove deposit is typical of bedded deposits in the Mazarn basin. It occurs in the west-trending asymmetrical syncline that is nearly 2 miles long from iots tight closure on the east to its truncation on the west by the alkali-rich rocks of the Magnet Cove intrusive body. The north limb of the syncline dips about 40º S. and the south limb is nearly vertical; the structure plunges west about 15º.
The orebody is at least ¾ milelong and approximately 60 feet thick. It contains all grades of ore as well as some layers and lenses of barren rock. A soft, fissile, black shale forms the footwall of the ore-bearing sequence and also separates the rest of the Stanley shale from the underlying Hot Springs sandstone and Arkansas novaculite. The deposit has no distinct hanging wall since the barite content of the Stanley Shale decreases irregularly above the richest part of the sequence.
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