Geophysical Methods for Mineral Exploration

June 30th, 2009

Client: Confidential Client

Project: MASW and GPR methods were used as exploration techniques to locate potential mineral deposits within a geologic setting of highly deformed metamorphic rocks overlain by lateritic soil horizons. A 24-channel land streamer system was used to profile overlying lateritic horizons and bedrock up to depths of 100 feet. MASW survey geometry was optimized for fepths up to 60 feet and high horizontal resolution. High-powered 100-MHz bi-static antennas were used to collect data along seismic lines as well as in areas unsuitable for the MASW method. Click to view a GPR cross-section.

Geological Services for Combined Sewer Overflow Project

June 30th, 2009

Client: Gilbane-Jacobs Joint Venture

Project: HGI is working on an ongoing multi-faceted project for a metropolitan combined sewer overflow.  HGI is charged with monitoring the blast vibrations in sensitive locales using both seismographs and hydrophones.  In addition to this monitoring HGI creates bedrock maps of the tunnel systems created by blasting or by a tunnel boring machine (TBM).

Mapping Migration Pathways at Brunswick Naval Air Station

March 30th, 2005

Client: Gannett Fleming

Project: A multidisciplinary geophysical study was performed at Naval Air Station, Brunswick, Maine. The goal of the study was to provide a better understanding of the possible migration pathways of the contaminants in bedrock fractures and deeper stratigraphic zones whose geometries might be controlled by bedrock morphology. The scope of work consisted of mapping the bedrock surface, identifying and locating fracture zones, and mapping the continuity and extent of key stratigraphic horizons. Seismic refraction and reflection, GPR, and resistivity were used to meet the study goals.

Borehole Geophysical Surveys

January 8th, 2006

Client: TTNUS

Project: HGI performed borehole logging as well as surface geophysical surveys at an EPA site in Rhode Island. The purpose of the logging was to locate bedrock fractures and determine their orientation (strike and dip), as well as the location and rate of water inflow. To accomplish these goals, HGI’s logging suite included caliper, natural gamma, heat pulse flowmeter (HPFM), and acoustic televiewer (ATV) logging in five boreholes.Click to view image #2 or image #3.

3D Utility Survey

September 8th, 2008


Client: Manafort Bros.

Project: HGI performed a ground penetrating radar survey to locate known and unknown utilities.  These utilities were mapped out in a 3D format using GSSI’s Radan program.  The 3D images were used to create a clearer view of where the utilities were relative to each other in terms of position and depth.