This report contains descriptions of mercury mines in southwest Arkansas as of the publication date.

Information in the report includes:

• Descriptions of the conditions of 67 cinnabar mines and prospects in the study area as of 1976
• History of cinnabar discovery and mining in the region
• Stratigraphy and structure of the study area
• Discussions of the mineralogy, size/shape of ore deposits, and their distribution and origin
• Two in-pocket topographic base maps with the geology and mines locations
• A fold-out geologic map of the mercury district showing distribution of the cinnabar deposits
• A page-sized map with prospect locations on Bemis Hill, Hill 2, and Hill 3
• Paragenetic diagram for ore and gangue minerals
• A cross-section diagram of the underground workings at the Humphrey Gold Corp. mine
• A table depicting production of mercury from the Arkansas district from 1931 to 1946
• A table depicting the price of mercury from 1930 to 1972
• A table depicting tenor of cinnabar ore from 14 mines in the district
• An appendix presenting analytical data on 192 samples for selected elements

*Includes:  57 pages, 4 plates, 8 figures, 3 tables