Projects Funded by the Minerals Coordinating Committee Through the Mineral Diversification Program
ABSTRACT These 3 projects sampled and analyzed pre-existing drill core, with an emphasis on precious metals and elements which had previously been neglected.
Project 255-1 sampled a total of 512 samples from the basal contact and inner portions of the largely mafic Duluth Complex in northeast Minnesota. The widespread nature of the mineralization associated with the basal contact portion was confirmed with 3 drill holes containing combined Au + Pt + Pd values exceeding 1000ppb and 13 other holes with lesser mineralization. Drill holes from the inner portion exhibited lower values.
Project 265 sampled 251 samples from 25 development drill holes from the Soudan Mine (Algoman-type iron formation). Gold mineralization (several hundred ppb's) appears to be breccia related. Pt and Pd values of similar values are problematical. Other samples exhibited anomalous Ba andF.
Project 266 analyzed 213 samples from 12 drill holes located in the granite-greenstone terrane of north central Minnesota (Beltrami County). Gold mineralization over 1 ppm was confirmed from previous sampling, and appeared to be associated with Bi, As, Sb, Se, S, Ag, Cu, Mo and Fe203. A weakly mineralized drill hole contained a small interval of calcareous "blackschist" alteration rock. Samples were analyzed for (varied with project) Au, Pt, Pd, Bi, Sb, As, B, Ba, S, Se, Te, Ag, Cu, Ni, Mo, W, Sn, F, Ga, Sc, Y, La, Ce, Zr, Nb, Ta, Cd, Zn, Pb, Cr, Co, V, Ti02, MgO, Fe203, MnO, Si02, Al203, P205, Li, Na20, K20, Rb, Sr, CaO, Be, Cs, and Cl.
Report 255-1/265/266: 1988-1989 Drill Core Repository Sampling Project: 255-1 Duluth Complex, 265 Soudan Mine, 266 Archean Greenstone; analysis of drill core from Duluth complex,Soudan mine, & greenstone terranes.
(366 pages, 8.5 x 11 inches, 13.84 MB)
Authors: E.H. Dahlberg, D. Peterson, and B.A. Frey
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255-1, Plate 1: Hoyt Lakes - Kawishiwi Area, St. Louis and Lake Counties, Northeastern Minnesota: Compilation of Bedrock Geology and Lineaments as adapted from Morey & Cooper (1976), Chandler (1986) with Drill Hole Locations of Drill Core Repository Project.
(20.93 x 33.86 inches, full size, 1.16 mb)
Author: MN DNR, Division of Minerals
255-1, Plate 2: Drill Hole Locations and Geology, Duluth Complex: Glacial Drift Geochemistry for Strategic Minerals, Lake County, Minnesota.
(39.3 x 29.1 inches, full size, 4.63 mb)
Author: MN DNR, Division of Minerals
Raw digital data of report 255-1/265/266 is available by request.
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