A geophysical survey is a non-invasive method of studying the subsurface properties of the Earth by measuring various physical properties, such as magnetic, seismic, and gravitational properties. These surveys are commonly conducted to gain insights into the geological features and composition of the Earth's crust, particularly for mineral exploration and mining.
Purposes of Mineral Exploration
In mineral exploration and mining, geophysical surveys have several uses:
1. Identification of Potential Deposits
Geophysical surveys can detect anomalies or variations in the subsurface that may indicate the presence of mineral deposits. For example, magnetic surveys can identify areas with elevated magnetism associated with certain minerals, while electrical resistivity surveys can detect variations in rock conductivity which can provide insights into potential mineralization.
2. Target Selection
Geophysical surveys help geologists and exploration teams identify specific locations where mineral deposits are likely to be found. This aids in target selection, helping to focus efforts and resources on the more promising areas for further exploration.
3. Mapping Geological Structures
Geophysical surveys can provide valuable information about subsurface geological structures such as faults, folds, and rock layers. Understanding these structures is critical for locating ore bodies and planning mining operations.
4. Estimation of Deposit Size and Depth
Geophysical data can be used to estimate the size and depth of mineral deposits, which is vital for determining the economic feasibility of potential mining operations.
5. Minimizing Drilling Costs
By narrowing down potential drilling sites, geophysical surveys can significantly reduce the cost and environmental impact of exploratory drilling.
6. Environmental Impact Assessment
Geophysical surveys can also be used to assess the environmental impact of mining activities by evaluating factors like groundwater flow and potential contamination risks.
What do Geophysical Surveys Cost?
The cost of a geophysical survey can vary widely depending on factors, including the size and complexity of the survey area, the type of geophysical methods used, the depth of investigation required, and the specific objectives of the survey. Several factors can influence cost, including:
Survey Scope. The size and scope of the survey area play a significant role in determining the cost. Larger areas or more extensive surveys will generally cost more.
Geophysical Methods. The type of geophysical method used for the survey also has a great impact on cost. These costs are associated with the difference in equipment, personnel, data processing, and expertise required for the survey.
Depth of Investigation. If the survey needs to investigate deeper subsurface layers, it may require more specialized equipment and expertise, which can increase the cost.
Terrain and Accessibility. The accessibility and terrain of the survey area can affect costs. Remote or difficult-to-reach locations may require additional logistical support and can be more expensive.
Project Timeline. The urgency of the project can also impact costs. Rushed or expedited surveys may come at a premium.
Data Interpretation and Reporting. The cost of geophysical surveys is also impacted by the method and intensity of data interpretation and the preparation of detailed reports, which are essential for understanding the survey results.
Regulatory and Permitting Costs. The cost of geophysical surveys may also be impacted by regulatory and permitting requirements that may be present based on location and survey type.
Geographical Location. The cost of services and labor can vary significantly by region in the United States. Depending on how accessible/inaccessible the area is will determine the cost for transporting personnel and equipment to the area as well as navigating the area for the survey.
Consultant/Service Provider. The choice of a geophysical survey provider or consultant can impact costs. Different companies may have varying pricing structures.
To get an accurate cost estimate for a geophysical survey, it is recommended to contact multiple geophysical survey companies or consultants, provide them with specific details about your project, and request a quote. They can assess the specific requirements of your project and provide you with a more precise cost estimate based on those factors.
ABOUT THE AUTHOR
BRIAN GOSS
President, Rangefront Mining Services
Brian Goss brings over 20 years of experience in gold and mineral exploration. He is the founder and President of Rangefront, a premier geological services and mining consulting company that caters to a large spectrum of clients in the mining and minerals exploration industries. Brian is also a director of Lithium Corp. (OTCQB: LTUM), an exploration stage company specializing in energy storage minerals and from 2014 to 2017, he fulfilled the role of President and Director of Graphite Corp. (OTCQB: GRPH), an exploration stage that specialized in the development of graphite properties. Prior to founding Rangefront, Brian worked as a staff geologist for Centerra Gold on the REN project, as well as various exploration and development projects in the Western United States and Michigan. Brian Goss holds a Bachelor of Science Degree with a major in Geology from Wayne State University in Michigan.