APPARENT MVT LEAD MINERALIZATION Hagni,


National Uranium Resource Evaluation (NURE) stream sediment sampling pro- gram to generate an algorithm that predicts magnitude of MVT lead min- eralization in SE Missouri with about 87% accuracy. Excepting arsenic and uranium analytical determinations, the production function and the controlling or independent geochemical parameters used in the Missouri geochemical model- ling case were identical to those applied in northern Arizona (ibid.).


Results


Figure 1 shows the results of apply- ing the MVT lead resource algorithm to NURE stream sediment geochemical data covering SE Missouri.


Aside from the very poorly sample- represented Old Lead Belt area, all known lead mineralization trends in SE Missouri are very accurately marked by algorithm-transformed contoured stream sediment data. In addition to this result, the transformed NURE data indicate the presence of a number of other MVT lead mineralization trends within the same exploration and mining province. Most of these trends follow the N-S orientation of the Viburnum Trend, very evidently reflecting the basic structural control of province lead-zinc mineralization by compression (Hagni 1989) of ground marginated by the left- lateral, SE-striking Central Missouri, Grand River, and NE Missouri tectonic zones (Kisvarsányi 2007). See the inset stress ellipsoid provided on Figure 1.


At the scale of the Missouri state map view (not provided here), the Joplin Pb-Zn MVT mining district in SW Missouri shows up as clearly in the algorithm-transformed NURE stream sediment geochemical data as the SE Missouri MVT district does.


Among other things, Figure 1 sug- gests that higher density stream sedi- ment sampling might constrain the subsurface locations of MVT lead deposit mineralization to a degree sufficient to guide early exploration drilling. Figure 1 also indicates that the Pb-Zn mineraliza- tion potential of southeast Missouri has not yet been exhausted.


Cited References


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Mineral Deposits: Applied


Publishing, Wilmette, Illinois, 287 pages.


48 TPG • Apr.May.Jun 2017 www.aipg.org


R.D.,1989,


The Geologists Series, v. 5, pp. 12–57.


Kisvarsányi, E.B., 2007, The Precambrian


tectonic frame-


work of Missouri as interpreted from the magnetic anomaly map: ACTA GGM DEBRECINA -- Geology, Geomorphology, Physical Geography Series, DEBRECEN vol. 2, pp. 143–150, http://geo.science.unideb.hu/acta/ geolgeom/dokument/volumes/ vol22007/13kisvarsanyi.pdf


Leach, D.L., Taylor, R.D., Fey, D.L., Diehl, S.F., and Saltus, R.W., 2010, A deposit model for Mississippi Valley- Type lead-zinc ores: US Geol. Survey Scientific Investigations Report 2010-5070-A,


52 pages, https://


pubs.usgs.gov/sir/2010/5070/a/pdf/ SIR10-5070A.pdf.


Miesch, A.T., Shoemaker, E.M., Newman, W.L.,


and Finch, W.I., 1959,


Chemical composition as a guide to the size of uranium deposits in the Salt Wash Member of the Morrison Formation, Colorado Plateau: Trace Elements Investigation Report 511, US Atomic Energy Commission, https://pubs.er.usgs.gov/publica- tion/tei511.


Missouri lead district: Society of Economic


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Newman, W.L., and Finch, W.I., 1960, Chemical composition as a guide to the size of sandstone-type uranium deposits in the Morrison Formation on the Colorado Plateau: United States Geological Survey Bulletin.


1112B, https://pubs. er.usgs.gov/publication/b1112B


Turner, L.D., and Turner, I.L., 2016, Use of surface lithogeochemistry to esti- mate magnitude of blind uranium mineralization in northern Arizona collapse breccia pipes: American Institute of Professional Geologists eNews reprint, http://96.93.209.186/ Sta ticC ontent/3 /TPGs/e- articles/2016_e-articlesJulAugSep. pdf.


Wenrich, K.J., 1985, Mineralization of breccia pipes in northern Arizona: Economic Geology, v. 80, no. 6, pp. 1722-1735.


Larry D. Turner is a mineral explora-


tion geologist with graduate education and training in exploration geochemistry and mineral economics. Although he was raised in the Missouri Lead Belt, since the mid-70s he’s worked as a mineral exploration geologist and geochemist in the western United States.


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