John F. Slack
John Slack is a Scientist Emeritus with the USGS Geology, Energy & Minerals (GEM) Science Center in Reston, VA.
Science and Products
Filter Total Items: 68
Mineral resources of the Citico Creek Wilderness Study Area, Monroe County, Tennessee
No abstract available.
Authors
John F. Slack, E. R. Force, P. T. Behum, B. B. Williams
Geochemical analyses of rock, soil, and stream sediment samples from the Big Frog Wilderness Study Area, Polk County, Tennessee and Fannin County, Georgia
Semiquantitative spectrographic analyses for 31 elements and atomic absorption analyses for gold and zinc on 43 stream sediments, 5 panned concentrates, 65 soils, and 81 rock samples from the Big Frog Wilderness Study Area and vicinity, Polk County, Tennessee, and Fannin County, Georgia, are reported here in detail. Locations for all 194 samples are given in Universal Transverse Mercator (UTM) coo
Authors
R. T. Hopkins, A.L. Meir, John F. Slack
K-Ar age of alunite alteration at Red Mountain, Lake City area, western San Juan Mountains, Colorado
The San Juan Mountains of southwestern Colorado are famous for rich vein deposits of base and precious metals and for patterns of conspicuous hydrothermal alteration. Areas of acid-sulfate alteration, characterized by extensive base leaching of volcanic rocks or hypabyssal plutons, are of current interest because of their local association with Au, Ag, and, in some cases, U mineralization (Lipman
Authors
Harald H. Mehnert, John F. Slack, Gerald T. Cebula
Mineral resources of the Big Frog Wilderness Study Area, Polk County, Tennessee and Fannin County, Georgia
The proposed Big Frog Wilderness is comprised of approximately 1820 hectares (18.2 km2) of mountainous terrain in the Cherokee and Chattahoochee National Forests south of the Ocoee River in Polk County, Tennessee, and Fannin County, Georgia. Rocks of the study area are greenschist-facies metasandstone, meta-arkose, metagraywacke, and dark slate of the Ocoee Supergroup of late Precambrian age. A ma
Authors
John F. Slack, Gertrude C. Gazdik, Maynard L. Dunn
Map showing lithostratigraphic and structural setting of stratabound (massive) sulfide deposits in the U.S. Appalachians
No abstract available.
Authors
Jacob Eugene Gair, John F. Slack
Occurrence and formation of avicennite, Tl2O3 , as a secondary mineral at the Carlin gold deposit, Nevada
Avicennite, Tl2O3, occurs as grains disseminated in silicified limestones in the upper part of the East ore zone of the Carlin gold deposit, Nevada. The avicennite is formed by the oxidation of carlinite, Tl2S, found in primary unoxidized carbonaceous ore immediately below the avicennite. The grains of avicennite closely resemble carlinite in size and shape. Some avicennite occurs as thin coating
Authors
Arthur S. Radtke, Frank W. Dickson, John F. Slack
Premetamorphic hydrothermal origin of the Tungsten Queen vein, Hamme District, North Carolina, as indicated by mineral textures and minor structures
The Hamme Tungsten district is a 13-km long, 2-km wide, northeast-trending belt located in northern Vance County, North Carolina and southern Mecklenburg County, Virginia (Fig. 1). The district contains the largest quartz-wolframite-type vein deposits in the United States. Over 50 tungsten-bearing veins occur in this area (Espenshade, 1947), from which more than 1 million short ton units of WO3 ha
Authors
Michael P. Foose, John F. Slack
The Yellow Dog peridotite and a possible buried igneous complex of Lower Keweenawan Age in the northern peninsula of Michigan
Partly serpentinized peridotite of early Keweenawan age crops out in two places along a 20-km-long zone of positive aeromagnetic anomalies in northern Marquette County, Michigan. Most of the area is mantled by Pleistocene drift and the bedrock is not exposed.Petrographic and electron microprobe studies show that the peridotite was originally a plagioclase lherzolite containing 40-50% olivine (Fo80
Authors
John S. Klasner, David W. Snider, W. F. Cannon, John F. Slack
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Filter Total Items: 68
Mineral resources of the Citico Creek Wilderness Study Area, Monroe County, Tennessee
No abstract available.AuthorsJohn F. Slack, E. R. Force, P. T. Behum, B. B. WilliamsGeochemical analyses of rock, soil, and stream sediment samples from the Big Frog Wilderness Study Area, Polk County, Tennessee and Fannin County, Georgia
Semiquantitative spectrographic analyses for 31 elements and atomic absorption analyses for gold and zinc on 43 stream sediments, 5 panned concentrates, 65 soils, and 81 rock samples from the Big Frog Wilderness Study Area and vicinity, Polk County, Tennessee, and Fannin County, Georgia, are reported here in detail. Locations for all 194 samples are given in Universal Transverse Mercator (UTM) cooAuthorsR. T. Hopkins, A.L. Meir, John F. SlackK-Ar age of alunite alteration at Red Mountain, Lake City area, western San Juan Mountains, Colorado
The San Juan Mountains of southwestern Colorado are famous for rich vein deposits of base and precious metals and for patterns of conspicuous hydrothermal alteration. Areas of acid-sulfate alteration, characterized by extensive base leaching of volcanic rocks or hypabyssal plutons, are of current interest because of their local association with Au, Ag, and, in some cases, U mineralization (LipmanAuthorsHarald H. Mehnert, John F. Slack, Gerald T. CebulaMineral resources of the Big Frog Wilderness Study Area, Polk County, Tennessee and Fannin County, Georgia
The proposed Big Frog Wilderness is comprised of approximately 1820 hectares (18.2 km2) of mountainous terrain in the Cherokee and Chattahoochee National Forests south of the Ocoee River in Polk County, Tennessee, and Fannin County, Georgia. Rocks of the study area are greenschist-facies metasandstone, meta-arkose, metagraywacke, and dark slate of the Ocoee Supergroup of late Precambrian age. A maAuthorsJohn F. Slack, Gertrude C. Gazdik, Maynard L. DunnMap showing lithostratigraphic and structural setting of stratabound (massive) sulfide deposits in the U.S. Appalachians
No abstract available.AuthorsJacob Eugene Gair, John F. SlackOccurrence and formation of avicennite, Tl2O3 , as a secondary mineral at the Carlin gold deposit, Nevada
Avicennite, Tl2O3, occurs as grains disseminated in silicified limestones in the upper part of the East ore zone of the Carlin gold deposit, Nevada. The avicennite is formed by the oxidation of carlinite, Tl2S, found in primary unoxidized carbonaceous ore immediately below the avicennite. The grains of avicennite closely resemble carlinite in size and shape. Some avicennite occurs as thin coatingAuthorsArthur S. Radtke, Frank W. Dickson, John F. SlackPremetamorphic hydrothermal origin of the Tungsten Queen vein, Hamme District, North Carolina, as indicated by mineral textures and minor structures
The Hamme Tungsten district is a 13-km long, 2-km wide, northeast-trending belt located in northern Vance County, North Carolina and southern Mecklenburg County, Virginia (Fig. 1). The district contains the largest quartz-wolframite-type vein deposits in the United States. Over 50 tungsten-bearing veins occur in this area (Espenshade, 1947), from which more than 1 million short ton units of WO3 haAuthorsMichael P. Foose, John F. SlackThe Yellow Dog peridotite and a possible buried igneous complex of Lower Keweenawan Age in the northern peninsula of Michigan
Partly serpentinized peridotite of early Keweenawan age crops out in two places along a 20-km-long zone of positive aeromagnetic anomalies in northern Marquette County, Michigan. Most of the area is mantled by Pleistocene drift and the bedrock is not exposed.Petrographic and electron microprobe studies show that the peridotite was originally a plagioclase lherzolite containing 40-50% olivine (Fo80AuthorsJohn S. Klasner, David W. Snider, W. F. Cannon, John F. Slack