Filters: Tags: Lawrence County, South Dakota (X) > Date Range: {"choice":"year"} (X)
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Unconformity between Middle Cambrian quartzites and subjacent Algonkian rocks. Railroad cut on east side of Deadwood. Lawrence County, South Dakota. October 1897.
Categories: Image;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Lawrence County, South Dakota,
Photographers,
Walcott, C.D. Collection,
photo print
Serrated ridge due to steep dipping Greenhorn limestone, southeast of Maitland, looking east. Lawrence County, South Dakota. 1903. Figure 9 in U.S. Geological Survey. Folio 108. 1904.
Categories: Image;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Lawrence County, South Dakota,
Photographers,
Stose, G.W. Collection,
photo print
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Gold,
Lawrence County, South Dakota,
Lead,
Silver,
Zinc
tract The research reported here concerns a four year study of the rock mechanics aspects of two underground hardrock mine study stopes. The first study was conducted at Anaconda Minerals Company's Carr Fork Mine near Tooele, Utah. The second study was conducted at the Homestake Mining Company's Homestake Mine in Lead, South Dakota. Both case studies were cooperative efforts of mining company personnel, the Spokane Research Center o 1 Large diameter (6 1/2 in.) blastholes were an integral part of the stoping method at each mine. A true vertical crater retreat (VCR) method was used at the Homestake Mine, while a vertical bench mining method (VBM) was used at the Carr Fork 1 Mine. VCR and VBM methods were developed...
Algonkian siliceous schist and arkosic grit weathered into pinnacles west of Nemo. Lawrence County, South Dakota. 1908. Plate 5 in U.S.Geological Survey. Folio 219. 1925.
Categories: Image;
Tags: Lawrence County, South Dakota,
Paige, Sidney collection,
Photographers,
photo print
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