DNR Report 317: 1997; Ore Deposit Modeling of the Footwall Mineralization of the Duluth Complex

Project Funded by the Minerals Coordinating Committee Through the Mineral Diversification Program

Introduction Extracted from Report 317:

INTRODUCTION (paragraph 1 only)  Mining of high-grade Copper (Cu)-Platinum Group Element (PGE) ore bodies in the footwall rocks beneath the Sudbury Igneous Complex (SIC) has led, over the last fifteen years, to many geological and geochemical studies of these deposits. The Cu-PGE deposits are characterized by massive chalcopyrite veins, pods, and stringers with thin chloritic alteration halos. The footwall ore zones are spatially associated with contact type Ni-Cu ores and extend hundreds to thousands of meters into the footwall rocks beneath these contact deposits. Vein grades of 30% Cu, 3% Ni, and 0.30 oz/ton precious metals (Au, Ag, Pt, Pd) are typical of the footwall ore bodies (INCO personal communication). The most fundamental geologic process associated with the footwall deposits of the Sudbury Mining Camp is the migration of the ore metals from the Sudbury Igneous Complex into the footwall environment. The footwall ores formed by migration of a fractionated, copper-PGE-rich residual sulfide liquid away from the early crystallizing mono sulphide solid solution (mss), into and along footwall structural zones. The discovery of similar ore deposits beneath the Duluth Complex could lead to a renewed interest in the exploration for, and mining of, various Cu-Ni ore types within the Duluth Complex. This research project, funded by the State of Minnesota, was initiated to create a method of detecting areas beneath the Duluth Complex that are favorable for hosting high-grade footwall deposits...



View or download report

Report 317: Ore Deposit Modeling of the Footwall Mineralization of the Duluth Complex
(203 pages, 8.5 x 11 inches, 7.46 MB)

Plates 1-46 are not available digitally at this time. 

Author: D.M. Peterson1
1University of Minnesota Duluth, Department of Geology

Please note: Best results in viewing this report will be obtained by saving the file to a location of your choice and opening with Adobe Reader or Acrobat. Some report information may not display as a result of opening with Acrobat directly from a web browser.

This report has been scanned in and applied with optical character recognition (OCR) which electronically translates the scanned image printed text into machine-encoded text. This allows users to then search the document by keywords in Adobe Reader or Acrobat software.

Disclaimer and Copyright Protection: Maps, Reports, Data, and Other Information:
The State of Minnesota makes no representations or warranties express or implied, with respect to the use of the information contained herein regardless of its format or the means of its transmission. There is no guarantee or representation to the user as to the accuracy, currency, suitability, completeness, usefulness, or reliability of this information for any purpose. The user accepts the information “as is." The State of Minnesota assumes no responsibility for loss or damage incurred as a result of any user’s reliance on this information. All maps, reports, data, and other information contained herein are protected by copyright. Permission is granted to copy and use the materials herein for any lawful noncommercial purpose. Any user of this information agrees not to transmit or provide access to all or any part of this information to another party unless the user shall include with the information a copy of this disclaimer.

Back to top