Images

USGS scientist examining outcrops of strongly deformed and metamorphosed rock along Divide Mountain in the Yukon-Tanana upland of eastern Alaska

Cinnabar mine site in Idaho.

USGS geologist Richard Lease collects samples of granitic bedrock high above Blockade glacier, Neacola Mountains, Alaska.

Helicopter arriving to pick up geologists after retrieving geophysical equipment from the flanks of Redoubt Volcano, Alaska, July 2015

Frac sands courtesy of Unimin Energy Solutions.

Frac sands courtesy of Unimin Energy Solutions.

View looking south down Kanab Creek toward the Grand Canyon and the Colorado River in the distance. 

USGS Scientists Sarah Davis, Taylor Mills, and David Naftz collect soil samples near the Pinenut uranium mine. Mine features visible in the background include the gray ore stockpile at the far left, the head frame used to access the underground mine workings at mid left, and the detention pond containing all water produced on the mine site on the right.  

Preliminary map of selected minerals for a portion of the Nabesna area of interest, near Orange Hill and Bond Creek deposits in Alaska. The image, derived from HyMap imaging spectrometer data collected in July 2014, is draped on shaded relief.

The copious rocks carried by the September 2013 Colorado floodwaters pulverized and diluted non-floatable materials from the built environment on the Left Hand Canyon.

While sampling the sediments deposited by the September 2013 Colorado floods, the scientists observed that roads (Left Hand Canyon highway) and houses built on the outside bends of river meanders were particularly vulnerable to flood damages.

Charles Drost, USGS Southwest Biological Science Center, measures a many-lined skink

Greg Linder, USGS Columbia Environmental Research Center, instructs Emily Simpson, Bethel College undergraduate student, on the dissection of a pocket gopher.

Ernie Valdez, USGS Fort Collins Science Center, examines a bat caught over the mine detention pond.

A field assistant pans for monazite and rare earth minerals in Wolf Creek, which cuts through the Melozitna granite. This area is part of the Bureau of Land Management's Central Yukon Planning Area, where USGS did a critical mineral assessment in 2015.

The Concord heavy-mineral-sands mine of Iluka Resources in south-central Virginia.

Mylonitic breccia in alluvium of Little Deer Creek, downstream from a moderately west-dipping contact between biotitic quartzite of the Gunsight Formation, which is structurally overlain by garnet-chloritoid-bearing banded siltite of the banded siltite unit of the Apple Creek Formation.

Small-scale syncline in siltite of banded siltite unit of Apple Creek Formation, within a zone of tight, north-plunging chevron folds, exposed on the south-facing slope above the upper part of Little Deer Creek, east of the Blackbird cobalt-copper mine area, in east-central Idaho.

Outcrop of biotitic meta-sandstone in the lower part of the Gunsight Formation, cut by white quartz veins with alteration envelopes of coarsely crystalline black biotite and minor muscovite. USGS intern, Shane Kostka prepares to collect representative samples from this outcrop.

Limonite-stained outcrop of the banded siltite unit of the Apple Creek Formation, near Blackbird Creek, south of the Blackbird cobalt-copper mine area, in the Salmon River Mountains of east-central Idaho.

Outcrop of the banded siltite unit of the Apple Creek Formation of the Lemhi Group, in the Lemhi sub-basin of the Mesoproterozoic Belt Basin. This exposure is along the Deep Creek road, southeast of the Blackbird cobalt-copper mine area, in the Salmon River Mountains of east-central Idaho.