Research Article| March 01, 1993 Microgravity Method for Detection of Abandoned Mines in New Jersey SUHAS L. GHATGE SUHAS L. GHATGE Principal Geologist New Jersey Geological Survey, CN-029, Trenton, NJ 08625 Search for other works by this author on: GSW Google Scholar Author and Article Information SUHAS L. GHATGE Principal Geologist New Jersey Geological Survey, CN-029, Trenton, NJ 08625 Publisher: Association of Environmental & Engineering Geologists First Online: 09 Mar 2017 Online Issn: 1558-9161 Print Issn: 1078-7275 © 1993 Association of Engineering Geologists Environmental & Engineering Geoscience (1993) xxx (1): 79–85. https://doi.org/10.2113/gseegeosci.xxx.1.79 Article history First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation SUHAS L. GHATGE; Microgravity Method for Detection of Abandoned Mines in New Jersey. Environmental & Engineering Geoscience 1993;; xxx (1): 79–85. doi: https://doi.org/10.2113/gseegeosci.xxx.1.79 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyEnvironmental & Engineering Geoscience Search Advanced Search Abstract The microgravity method has been used to detect two shallow, subsurface abandoned mines in northern New Jersey. Synthetic models simulated the expected gravity anomalies in the two areas. The first site, Lawrence Iron Mine, tested the applicability of microgravity for abandoned-mine detection. Two profile lines were laid out at right angles to the strike of the magnetite deposit in an amphibolite host rock. The broad gravity lows (magnitude 0.04 and 0.07 mGals) on the gravity profiles were modeled to show mine workings about 10 ft square and 5 ft deep that were filled with loose soil. Trenching confirmed the location of the buried mine. At the Schuyler Copper Mine, located in an urban area, data were collected along four parallel profile lines spaced 10 ft apart. An anomalous low (magnitude 0.03 mGals) on the gravity map was modeled and interpreted to be due to an empty vertical shaft. The shaft is more than 60 ft deep, about 12 ft long and 8 to 10 ft wide. It is capped by about 10 ft of unconsolidated material overlying sandstone bedrock. Drilling confirmed the results of the gravity model. The success of the method depended on the depth and size of the mine instrument accuracy, station spacing, station location and elevation control. Minimizing errors due to the instrument drift, station location and station elevation maximized the resolution of the technique. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.