Geophysics HM Ltd (GHM) is a professional corporation specializing in mineral exploration. With well acquired experience in the mining sector our geophysical methodologies are particularly oriented for targeting gold and base metals.
Our professionals experience contemplate more than 18 years of geophysical exploration and over 300 projects completed worldwide. Survey methodology combines the strengths of conventional geophysics (Induced Polarization, Seismic, Magnetic, Magnetotelluric), geology, mineralogy and GIS into a compilation product to identify, locate and delineate mineral deposits.
GHM mission is to provide our clients with a tool to resolve complex geological and mining applications.
o Induced Polarization
The time domain Induced Polarization and Resistivity method is a controlled-source galvanic technique, initially introduced in the mining industry in the early 1980s.
For the time domain DCIP survey, a pulsating current is transmitted into the subsurface through a pair of current electrodes. The current is transmitted into the ground in a sequence of 2 seconds ON, 2 seconds OFF duty cycle current pulses via a current transmitter (Tx).
The transmission of the current into the ground may last for several minutes until the rock minerals reach the chargeable saturation limit.
After the current is turned off, the time decaying signal (secondary voltages) from minerals and rocks are measured by a number of potential electrodes distributed on the ground surface at a preset distance from the source of the current points.
o Refraction Seismic
The refraction seismic method is used to measure the depths and velocities of subsurface layers.
It is particularly useful for mapping the depth and topography of the bedrock surface. It can also be used to find the elastic properties of these layers, which are useful for engineering purposes.
Using the velocity of the bedrock, the rippability of the bedrock can be determined along with an estimate of the size of machine required.
o Self Potential
Self potential or spontaneous potential (SP) methods measure the electrical potential field caused by ambient DC electrical currents in the earth. Electrical currents occur nearly everywhere in the earth due to:
The first four above are generally due to release or capture of charged particles in underground chemical reactions. The fifth arises where a pressure gradient causes any fluid to flow through a permeable medium.
Where there are contaminant plumes or other subsurface phenomena which contain decomposing or reacting chemicals of all kinds, the release or capture of charged ions creates currents detectable by SP surveys.
Acid mine drainage generation zones, as well as underground fires in mines or organic waste masses (e.g. buried leaf mulch or stumps) in particular produce strong SP anomalies.
Other geophysical methods available are: Magnetic, VLF, Max-Min, Electromagnetic (STDEM, BHEM), Metal Detection, Radiometry, Mise-A-La-Masse
o New Growth Project for Northern Superior
o Goldlund Project for Tamaka Gold
o Shining Tree Project for Platinex
o Thorneloe and Deloro Projects for Geomark
o Cook Lake Project for Sabina Gold and Silver
o Rio Grande Project for Regulus Resources
o Constancia Project for Norsemont Mining
o Los Zorros Project for Samex Mining
o Black Fox Mine Project for Brigus Gold
o Tesoro Gold Project for St Ellias Mines
o Ketza River Project for Yukon-Nevada Gold
o Rainy River Project for Rainy River Resources
o Upper Beaver Project for Queenston Mining3
o South Bay Mine Project for Skyharbour
Geophysics HM Ltd provides geophysical services and consulting using a unique and innovative multi-parameter time series acquisition and processing platform “XG”.
Our “Mission” is to provide high quality geophysical exploration and consulting using the most advanced technology, processing and interpretation toolscurrently available in the mining industry.
51 Strachan Street East. Hamilton. Ontario. L8L3M3