1-20 OF 289 RESULTS FOR

homestake-type

Results shown limited to content with bounding coordinates.
Follow your search
Access your saved searches in your account

Would you like to receive an alert when new items match your search?
Close Modal
Sort by
Series: Society of Economic Geologists Guidebook Series
Published: 01 January 1990
EISBN: 9781934969601
... of metamorphosed graywacke, quartzite, shale, basalt, gabbro, and iron formation. Carbonate and silicate type iron formations occur in five major districts in the Black Hills. These numerous metamorphosed iron formations host many minor gold, arsenic, and iron deposits as well as the Homestake gold mine, which...
Series: Society of Economic Geologists Guidebook Series
Published: 01 January 1990
DOI: 10.5382/GB.07
EISBN: 9781934969601
Journal Article
Journal: GSA Bulletin
Published: 01 September 1948
GSA Bulletin (1948) 59 (9): 941–976.
... and Homestake, are dominantly ankeritic carbonate and iron-magnesium carbonate respectively. The younger formations, the Ellison, Northwestern, Grizzly, and Flag Rock, are dominantly argillaceous rocks with some quartzites and other rock types. Pre-Cambrian intrusive rocks, originally gabbroic, cut the pre...
Image
Cross section A-A’ through the <span class="search-highlight">Homestake</span> intrusive complex (see Fig. 3  for...
Published: 01 August 2006
F ig . 10. Cross section A-A’ through the Homestake intrusive complex (see Fig. 3 for location), showing breccia zones dominated by sedimentary rock clasts, fault zones, and the Homestake resource areas in light gray. Breccia zones dominated by shale clasts are identified according
Series: Society of Economic Geologists Guidebook Series
Published: 01 January 1990
EISBN: 9781934969601
... Abstract The Homestake mine in the northern Black Hills, South Dakota is the largest iron-formation-hosted gold deposit known (Fig. 1), and has produced 1,113 tonnes (35.8 million oz.) of gold from 128 million tonnes of ore milled. In 1989 the mine produced 11.9 tonnes of gold. The deposit...
Journal Article
Journal: GSA Bulletin
Published: 01 September 1948
GSA Bulletin (1948) 59 (9): 927–940.
...JAMES A NOBLE Abstract Widely scattered bodies of Tertiary intrusive porphyry crop out in the northern Black Hills, in greatest abundance in a circular area of about 10-mile radius with Lead and the Homestake Mine at the center. Five rock types are represented: rhyolite; quartz monzonite; monzonite...
Series: Society of Economic Geologists Guidebook Series
Published: 01 January 1989
DOI: 10.5382/GB.04
EISBN: 9781934969571
Series: Society of Economic Geologists Guidebook Series
Published: 01 January 1997
DOI: 10.5382/GB.28
EISBN: 9781934969816
... Abstract The Archimedes gold deposit, discovered in 1992 by Homestake Mining Company, is about 1 mile northwest of Eureka, Nevada in the northern part of the Eureka minin district (Nolan, 1962). The deposit, described in further detail by Dilles et al. (1996), is a largely stratiform body...
Series: Society of Economic Geologists Guidebook Series
Published: 01 January 1990
EISBN: 9781934969601
... Abstract In the northern Black Hills, epithermal to mesothermal Au-Ag-(Pb)-(W) deposits of the sediment-hosted type and the intrusion-hosted type are spatially and temporally associated with an east-west zone of Tertiary (40-60 Ma) alkalic igneous intrusions. Considerable structural relief...
Series: Society of Economic Geologists Guidebook Series
Published: 01 January 1990
EISBN: 9781934969601
... Abstract Tertiary gold-silver deposits in the Lead-Deadwood area have been exploited almost as long as the Precambrian Homestake gold deposit. The deposits were first described by Irving (1904) who was able to visit and map many of the mines. Recent papers by Shapiro and Gries (1970), Norton...
Series: Society of Economic Geologists Guidebook Series
Published: 01 January 1989
DOI: 10.5382/GB.04
EISBN: 9781934969571
... Abstract The midcontinent of the United States hosts some of the world's largest, economically most valuable mineral districts and metallogenic provinces. The Precambrian iron deposits of the Lake Superior region include both Algoma- and Lake Superior-type Fe and Fe-Mn ores. Native cu and Cu-Ni...
Series: Economic Geology Monograph Series
Published: 01 January 1989
DOI: 10.5382/Mono.06.43
EISBN: 9781629490014
... Abstract In the northern Black Hills, epithermal to mesothermal Au-Ag-(Pb)-(W) deposits of the sediment-hosted type and the intrusion-hosted type are spatially and temporally associated with an east-west zone of Tertiary (40-60 Ma) alkalic igneous intrusions. Considerable structural relief...
Series: GSA Field Guide
Published: 01 January 2013
DOI: 10.1130/2013.0033(05)
EISBN: 9780813756332
...Introduction Tectonic Setting and Overview of Shear-Zone Evolution Figure 1. Location map showing outcrop distribution (shaded) of Precambrian rocks in Colorado. Abbreviations: CMB—Colorado mineral belt (Tweto and Sims, 1963 ; McCoy et al., 2005 ); HSZ—Homestake shear zone; GCSZ...
FIGURES | View All (9)
Journal Article
Journal: Economic Geology
Published: 01 September 1937
Economic Geology (1937) 32 (6): 810–825.
... in view of the occurrence of these minerals in the Homestake Mine, three miles distant.The remarkable feature of the ores is the abundant occurrence of four types of iron sulphide aside from small amounts of pyrrhotite. These varieties are: aggregates of anhedral grains of pyrite; euhedral pyrite crystals...
Journal Article
Journal: Economic Geology
Published: 01 November 2016
Economic Geology (2016) 111 (7): 1731–1752.
... of all types ( Gregory et al., 2015 ). The aims of this paper are to (1) determine if early pyrite, pyrrhotite, and marcasite have been texturally and geochemically preserved at the Homestake deposit (despite locally intense and regionally long-lived deformation and metamorphism) using optical...
FIGURES | View All (14)
Journal Article
Journal: SEG Discovery
Published: 01 January 1993
SEG Discovery (1993) (12): 1–16.
... are associated with the Homestake intrusive complex (Homestake breccia complex), Henderson Mountain stock, and Fisher Mountain intrusive complex. The Fisher Mountain and Homestake intrusive complexes both show typical concentrically-zoned, porphyry-type alteration characterized by silicic and potassic...
FIGURES
Image
a) Hand sample of chlorite-rich BIF cut by a quartz-sulfide vein containing...
Published: 01 November 2016
Fig. 2 a) Hand sample of chlorite-rich BIF cut by a quartz-sulfide vein containing very high-grade gold. Such accumulations of gold are rare at Homestake. b) Arsenopyrite-pyrrhotite-pyrite-altered BIF, cut by late quartz-siderite vein. This type of ore is more common. c) Carbonaceous, pyritic
Journal Article
Journal: Economic Geology
Published: 01 August 2006
Economic Geology (2006) 101 (5): 955–980.
...F ig . 10. Cross section A-A’ through the Homestake intrusive complex (see Fig. 3 for location), showing breccia zones dominated by sedimentary rock clasts, fault zones, and the Homestake resource areas in light gray. Breccia zones dominated by shale clasts are identified according...
FIGURES | View All (15)