CFR > Title 43 - Public Lands: Interior > SUBTITLE B—Regulations Relating to Public Lands > CHAPTER II—BUREAU OF LAND MANAGEMENT, DEPARTMENT OF THE INTERIOR (parts 1000 to 9260) > SUBCHAPTER C—MINERALS MANAGEMENT (3000) (parts 3000 to 3871) > PART 3836—ANNUAL ASSESSMENT WORK REQUIREMENTS FOR MINING CLAIMS > SUBPART A—Performing Assessment Work (§3836.10 to §3836.15) > 3836.13—What are geological, geochemical, or geophysical surveys?

3836.13—What are geological, geochemical, or geophysical surveys?

(a) Geological surveys are surveys of the geology of mineral deposits. These are done by, among other things, taking mineral samples, mapping rock units, mapping structures, and mapping mineralized zones.
(b) Geochemical surveys are surveys of the chemistry of mineral deposits. They are done by, among other things, sampling soils, waters, and bedrock to identify areas of anomalous mineral values and quantities that may in turn identify mineral deposits.
(c) Geophysical surveys are surveys of the physical characteristics of mineral deposits to measure physical differences between rock types or physical discontinuities in geological formations. These surveys include, among other things, magnetic and electromagnetic surveys, gravity surveys, seismic surveys, and multispectral surveys.