Enhancement of our domestic supply of critical minerals will help to decrease our reliance on foreign sources of minerals that are important to the Nation’s security and economy. Minerals containing critical resources such as rare earth elements (REE), lithium, tellurium, gallium, indium, and germanium are the products or by-products from mining of several major mineral deposit types such as carbonatite, evaporite playas, porphyry copper, and zinc-bearing massive sulfides. As such, mine tailings and waste rock piles in abandoned mine lands can potentially be re-processed as new or future critical resource streams, but only if we have 3-dimensional high spatial resolution mineral maps to evaluate their potential economic and environmental impacts.
Hyperspectral instruments, stereo cameras, and/or lidar instruments have great potential for producing high-resolution 3-D mineral maps. Such data can be used to help delineate locations and volumes of potential critical resources and help determine environmental impacts of abandoned mine materials exposed across the landscape. The USGS is pursuing a major effort to identify areas that have the potential for containing undiscovered critical mineral resources, as a part of the Earth Mapping Resources Initiative (Earth MRI – Day, 2019). Earth MRI efforts will include collection of new geophysical and lidar data surveys, rock drill cores, and more detailed geologic mapping in high priority areas coordinated with State geological surveys and other partners and stakeholders.
We are therefore seeking a post-doctoral candidate who can utilize hyperspectral image data to produce high-spatial resolution 3-D mineral maps for analysis of critical minerals related to both undiscovered deposits and/or abandoned mine waste materials. Successful candidates will propose research incorporating elements of (but not limited to) the following four areas of major interest: Use of hyperspectral imaging and mapping methods: 1) as an exploration tool for the detection of various types of REE (e.g., Long et al., 2010) and other critical mineral deposits such as lithium; 2) for providing detailed mineral maps that can help further prioritize Earth MRI geologic mapping efforts, especially in areas of remote and inaccessible terrain; 3) for mapping the mineralogy of abandoned mine waste piles (including nearby acid-buffering carbonate rocks) that can be combined with lidar and other datasets for determining amounts of by-product resources that can be extracted, as well as environmental impacts to surrounding surface and groundwater (e.g., Jackisch et al., 2018); and 4) for evaluating the utility of existing and future planned advanced multispectral and hyperspectral sensors for items 1, 2, or 3 using existing higher resolution data sources.
Ideal candidates should have some knowledge of hyperspectral image calibration and field validation methods, geological application of remotely sensed data, and demonstrated experience in remote sensing and geographic information systems analysis software. We welcome and encourage applicants with such skills acquired from working with planetary remote sensing data, including those studying terrestrial analogs in support of planetary mapping efforts. Interested applicants are strongly encouraged to contact the Research Advisor(s) early in the application process to discuss project ideas.
References:
Day, W.C., 2019, The Earth Mapping Resources Initiative (Earth MRI): Mapping the Nation’s Critical Mineral Resources: U.S. Geological Survey Fact Sheet 2019–3007, 2 p.
Jackisch, R., Lorenz, S., Zimmermann, R., Möckel, R., and Gloaguen, R., 2018, Drone-Borne Hyperspectral Monitoring of Acid Mine Drainage: An Example from the Sokolov Lignite District: Remote Sensing, V. 10, No. 385, 23 p.; doi:10.3390/rs10030385.
Long, K.R., Van Gosen, B.S., Foley, N.K., and Cordier, D., 2010, The Principal Rare Earth Elements Deposits of the United States – A Summary of Domestic Deposits and a Global Perspective: U.S. Geological Survey Scientific Investigations Report 2010-5220, 96 p
Proposed Duty Station: Reston, VA
Areas of PhD: Geology, economic geology, geologic remote sensing, planetary geology, or related fields (candidates holding a Ph.D. in other disciplines, but with extensive knowledge and skills relevant to the Research Opportunity may be considered).
Qualifications: Applicants must meet one of the following qualifications: Research Geologist, Research Geophysicist.
(This type of research is performed by those who have backgrounds for the occupations stated above. However, other titles may be applicable depending on the applicant's background, education, and research proposal. The final classification of the position will be made by the Human Resources specialist.)
Human Resources Office Contact: Kimberly Sales, 703-648-7478, ksales@usgs.gov
