Heritage Geophysics
Heritage Geophysics Available Instruments and Products home rentals Heritage Geophysics Available Instruments and Products case histories Heritage Geophysics Available Instruments and Products second hand Heritage Geophysics Training training Heritage Geophysics Available Instruments and Products international sales Heritage Geophysics Available Instruments and Products contact Heritage Geophysics Available Instruments and Products sitemap Heritage Geophysics Available Instruments and Products
Heritage Geophysics Available Instruments and Products
Resistivity Meters & Imaging Systems
Resistivity Meters
Resistivity Imaging Systems
Resistivity Monitoring Systems
Resistivity Software

Induced Polarization
IP - Receivers
IP - Transmitters

Electromagnetics
Multi Frequency EM
T-VLF System

Logging Probes
Borehole Logging Probe

Magnetic Susceptibility Meters
SM-30 Field
SM-100 Lab
SM-105 Lab
SM-400 In-Situ

Magnetometers
Magnetometers

Magnetic Resonance Systems
NUMIS & NUMIS Plus

Seismographs
Land Seismographs
Marine Seismographs

Seismometers
Sensors

Magnetotelluric
StrataGEM

Case Histories      Back to Case Histories List


Sulfide Exploration in Newfoundland Using Gamma Spectrometry

 

On Pilley's Island, central Newfoundland, potassic alteration associated with volcanic hosted massive sulphide deposits (fig. B) produces sharp bull's-eye airborne anomalies (fig. A).

Using a GR-320 field spectrometer, these anomalies can be easily quantified (fig. D) and mapped on the ground, permitting more efficient se of expensive whole-rock major and trace element analyses, where required. Barren, unaltered, mafic and felsic volcanic host rocks each produce distinct low-K fields (fig. D). Where mineralizing solutions have affected these units, associated sericite and K-feldspar alteration dramatically increase the K content, as shown by the Bumble Bee Bight altered basalts (pictured fig. C) and felsic volcanics in the Mansfield showing.

Distinction of barren, rusty, pyritized rocks from pyritic, mineralized sericite altered outcrops is made easy by using the GR-320 to detect and map the associated potassic alteration. As illustrated in fig. D, the altered, mineralized basalts retain their relatively low thorium signature despite intense alteration. Similarly, the high thorium content of the felsic volcanics is preserved.

Although economic cenectrations have yet to be outlined in these thick, felsic volcanic sequences, the very large volume of potassic alteration suggests potential for large, blind, high grade Kuroko-style massive sulphide deposits.

Gamma5.JPG (31352 bytes)

Back to TOP
home rentals case histories second hand international sales contact sitemap

Heritage Geophysics Inc.   625 Valley Road, Littleton, CO 80124   Tel & Fax: (303) 790-4237   Cell (720) 320-2821

1998-2008   Heritage Geophysics Inc.   All rights reserved.

r1 r2 r3 r4 r5 r6 r7