Media Alert: Low-level helicopter flights to image geology over central Nevada

The survey will begin in November 2024 and is expected to be completed in February 2025, weather and flight restrictions permitting.

Flights will include areas in Humboldt, Lander, Eureka, Elko, White Pine, and Nye counties in Nevada.

Initial survey flights will be based out of Tonopah, Nevada, and are planned to move northward over the winter. The survey base and flight locations are subject to change with little warning to other parts of the survey area as necessary to minimize ferrying distances and avoid adverse flying conditions.

The purpose of the survey is to provide images of subsurface electrical conductivity that expand the fundamental knowledge of geology underpinning the Basin and Range province of Nevada. These flights are a continuation of a project that began in 2022. The survey area hosts brines and evaporation-based mineral systems that might contain lithium resources, and rock formations that may contain other critical minerals as well as base and precious metals.

The helicopter will fly along pre-planned flight paths relatively low to the ground, about 200 feet (60 meters) above the surface. Flight line spacing will vary depending on location, typically separated by about 3 miles (5 kilometers).

A sensor that resembles a large hula-hoop will be towed beneath the helicopter to measure small electromagnetic signals that can be used to map geologic features. The data collected will be made freely available to the public on ScienceBase, typically within one to two years of flight completion.

None of the instruments carried on the aircraft pose a health risk to people or animals. The aircraft will be flown by experienced pilots who are specially trained and approved for low-level flying. The survey company works with the FAA to ensure flights are safe and in accordance with U.S. law.

The surveys will be conducted during daylight hours only. Surveys do not occur over densely populated areas and the helicopter will not directly overfly buildings at low altitude.

This airborne electromagnetic survey is funded by the USGS Earth Mapping Resources Initiative as part of a national-scale effort to acquire modern high-resolution airborne geophysical data through airborne geophysical surveys like this one, geochemical reconnaissance surveys, topographic mapping using lidar technology, hyperspectral surveys, and geologic mapping projects. This survey is designed to meet needs related to mineral resource assessments, geologic framework, and mapping studies, as well as supporting geothermal energy and water resources studies.

The new geophysical data will be processed to develop high-resolution three-dimensional representations of geology to depths over 1,000 feet (300 meters) below the surface. The models and maps produced from the survey are important for improving our understanding of critical mineral resource potential, groundwater aquifer structure and salinity, geothermal resource potential, and natural hazards. These results will support detailed geologic mapping studies being conducted by USGS and the Nevada Bureau of Mines and Geology, by expanding on the mapping of formations where they can be observed in the hills and mountains into the valleys, where these geologic layers become buried under sediments and volcanic deposits.

The survey fits into a broader effort by the USGS, the Nevada Bureau of Mines and Geology, and many other state geological surveys and other partners, including private companies, academics, and state and federal agencies to modernize our understanding of the Nation's fundamental geologic framework and knowledge of mineral resources.

The USGS is contracting with Xcalibur Multiphysics under Fugro Earthdata, Inc. to collect these data.

To learn more about how the USGS is investing the resources from the Bipartisan Infrastructure Law, visit our website. To learn more about USGS mineral-resource and commodity information, please visit our website and follow us on X.