Paul R. Dingess, 1989. "Geology of the Asarco West Fork Deposit Viburnum Trend - Southeast Missouri", Mississippi Valley-Type Mineralization of the Viburnum Trend, Missouri, Richard D. Hagni, Raymond M. Coveney, Jr.
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The West Fork ore body was discovered in January 1960, during the early exploration and discovery phase of the Viburnum trend, but development of the deposit was delayed until 19RO. After partial development, the downturn in Pb prices resulted in shutdown until late 1984. Limited production of 1,000 tpd began in September 1985, increased to 1,500 tpd in May 1987, and finally to full production of 3,800 tpd in July 1988. The general location is shown in Figure 1.