Severson, Mark JHauck, Steven A2015-10-052017-04-142015-10-052017-04-141997-12https://hdl.handle.net/11299/187117The files attached to this record include the report (TR-1997-19.pdf), Plates I-IV mentioned in the report (TR-1997-19_PlateI.tif, TR-1997-19_PlateII.tif, TR-1997-19_PlateIII.tif, and TR-1997-19_Plate IV.tif), and the Appendix 3 files. Please note that Plate II was cut off on the top side in the original physical version. The Appendix 3 files were originally located on a 3.5-inch floppy disk labeled "WA Rsv. NRRI/TR-97/19 Appendix 3 Diskette - ALLenwr.WK1 Whole Rock Analyses - Magusc.Wb2 [sic] Magnetic Susceptibility Measurements" and contained within the physical report. The 2 files listed on the disk label (and described on page 102 of the report) were extracted from the disk in August 2021. ALLENWR.WK1 is a Lotus 1-2-3 spreadsheet; since the software used to create this file is old and difficult to find, the file was opened in OpenOffice Calc 4.1.6, converted to a comma separated values (.csv) file, and attached, along with the original version, to this record. MAGSUSC.WB2 is a Quattro Pro v. 6.0 workbook file consisting of a Summary sheet that contains multiple formulas followed by 13 sheets with data, as well as 17 non-inserted charts on a sheet labeled Objects. This file was opened in Quattro Pro X9, converted to Microsoft Excel 97-2003 (.xls), and then opened in Microsoft Excel 2016 and converted to .xlsx. The formulas on the Summary sheet were retained (although column B contains some slight discrepancies); the non-inserted charts were not. The original .WB2 and converted .xlsx files are both attached to this record. The remaining files attached the this record (MAGSUS8.xlsx/Drill Hole SL-8, MAGSUS10.xlsx/Drill Hole SL-10, MAGSUS13.xlsx/Drill Hole SL-13, MAGSUS16.xlsx/Drill Hole SL-16, MAGSUS19.xlsx/Drill Hole SL-19A, MAGSUS26.xlsx/Drill Hole SL-26, and WHCHEM.xlsx) were uploaded previously and do not appear to be related to this report at all.Geologic mapping of the igneous rocks of the Partridge River intrusion (PRI) within the Allen Quadrangle was conducted during the 1996-1997 period by Severson and Miller (1997). In addition to the surface geology, drill holes were logged in order to gain a better understanding of the third-dimensional geology and Cu-Ni mineralization of the quadrangle. Drill hole correlations of igneous units, along with cross-sections and a discussion of Cu-Ni±PGE enriched zones, are presented in this report. Detailed logging of drill core from over 400 drill holes indicates that there are at least seven major igneous units (Units I through VII) within the basal 3,000 feet of the PRI. These units, starting with Unit I at the base, are described in Severson and Hauck (1990) and are reiterated herein for drill holes within the Allen Quadrangle. Also present within the quadrangle and described in this report are late plug-like bodies of Oxide-bearing Ultramafic Intrusions (OUI), a Keweenawan sill within the Biwabik Iron-Formation (K-Sill), and a small Keweenawan(?) intrusive within the Archean rocks near a major fault zone. Establishment of an igneous stratigraphy for the PRI provides a framework that can be used to determine the nature and location of fault offsets between drill holes. The tenor of Cu-Ni mineralization is often locally increased along some of these faults. Fault zones, with or without increased mineralization, that are discussed in this report include faults in the Wetlegs Cu-Ni deposit, faults in the Wyman Creek Cu-Ni deposit, the Siphon Fault, and the Donora Fault. Many of these fault zones are depicted on the cross-sections that accompany this report. Enrichments in Platinum Group Elements (PGE) occur at several stratabound horizons within the Allen Quadrangle (using an arbitrary cutoff of >90 ppb Pd). All of these PGE-enriched horizons are present in sulfide-bearing troctolitic rocks that are positioned immediately below, and in some cases within, laterally continuous ultramafic layers. However, the overall Pd content in some of the horizons shows a definite decrease in an east-to-west direction. This trend suggests that as the magma of the PRI was intruded, in an east-to-west direction(?), it became progressively impoverished with respect to PGEs.enGeologic mappingSurface geologyBoreholesPartridge River intrusionCopper-nickel depositsPlatinum groupNatural Resources Research InstituteUniversity of Minnesota DuluthTechnical Report