Big Sky Geophysics is a consulting and contracting company located in Bozeman, Montana. I operate the company as a sole proprietor. I have been working as a geophysicist for over twelve years and both execute field work and perform survey planning, processing, and interpretation. I have worked throughout North America on projects ranging is scope from one day engineering surveys to a multiyear follow up of a $500,000 airborne survey. I use potential field (gravity and magnetics) and electrical/EM methods for applications in mineral exploration, hydrocarbon exploration, and engineering studies. I believe in using the best equipment possible for collecting, processing, and interpreting geophysical data. My office is fully networked including 2.4 GHz Core 2 Duo workstation, Pentium IV laptop, Pentium III laptop for field acquisition, laser printer, office inkjet printer, portable inkjet printer, HP DesignJet 755CM plotter, digitizing board, scanner, and archive backup system. I use a large variety of computer programs including Geosoft Oasis Montaj potential field mapping and processing software, EMIT Maxwell EM processing and modeling software, NGA GM-SYS potential field modeling software, Geotomo RES2DINV and RES3DINV two and three dimensional IP/resistivity inversion software, SU seismic/ground penetrating radar reflection processing software, WinSism seismic refraction processing software, ArcView GIS software, Golden Software digitizing software, and numerous public domain, commercial, and personal programs written in FORTRAN, C, and BASIC for formatting and processing various geophysical data types. Other office equipment includes drafting table, light table, and layout table. I also have high speed internet and a password protected FTP site to allow rapid data sharing with clients. I am gradually acquiring all of the field gear necessary to perform surveys. At the present time I own GEM GSM-19W Overhauser Walking Magnetometer/Gradiometer (0.5 second sampling rate), GEM GSM-19TG Proton Precession Walking Magnetometer/Gradiometer (3.0 second sampling rate), LaCoste and Romberg model G gravimeter (S/N G164), Trimble 5700 centimeter level accuracy eRTK GPS base/rover pair (with both real time and postprocessing options), Geofyzika digital GS-512 gamma ray spectrometer with a large (3") external crystal (with ability to store full spectrum simultaneously rather than four windowed regions sequentially), two Apex Parametrics Max-Min II EM induction systems (one digital and one analogue), Iris Instruments time domain resistivity/induced polarization system (VIP3000 3 kW transmitter and IP-2 two channel receiver), Exploranium GR110 scintillometer, Geonics VLF receiver with resistivity option and miscellaneous positioning and surveying devices. I have also integrated the magnetometers with two 12 parallel channel GPS receiver system for positioning. If I do not have the proper equipment to perform a survey, I will rent the proper gear rather than to try to apply the tools I have. This insures the best possible chance of success for the project. If you feel I may be able to help you with a project, please contact me. I enjoy both field work and processing/interpretations and will work to incorporate any geophysical planning and results with additional data such as geologic mapping and well logs, geochemical sampling, and existing water table information. If you wish to have additional information about my experience and education, I have provided my resume. I encourage you to consult the case studies. I also discuss some of the advantages and potential pitfalls of using GPS positioning systems with geophysical surveys.

Clark Jorgensen P.O. Box 353 Bozeman, Montana 59771 +(406) 587-6330 telephone/facsimile +(406) 580-9718 mobile clark@bigskygeo.com