|Quadrangle map, 1:250,000-scale||NB|
|Quadrangle map, 1:63,360-scale||A-2|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||About 1.4 miles of Gold Run Creek upstream of its confluence with Glacier Creek has been placer mined for gold. Poorman Creek, a headwater tributary to Gold Run Creek, has also been placer mined over most of its 1 mile length. This site is plotted at the junction of Poorman and Gold Run Creeks. It is near the northwest corner of section 23, T. 4 N., R. 19 E. of the Copper River Meridian. This is locality 63 of Richter and others (1975) and National Park Service locality WRST-69 (unpublished data). Cobb and Richter (1980) include this mine under the name 'Gold Run Cr.'. It is accurately located.|
Geologic descriptionAbout 1.4 miles of Gold Run Creek upstream of its confluence with Glacier Creek has been placer mined for gold. Poorman Creek, a headwater tributary to Gold Run Creek, has also been placer mined over most of its 1 mile length (Richter and Jones, 1973). These placers were discovered in 1913 and mining took place intermittently to after WW II. Early placer workings described by Capps (1915, 1916) include a 150- by 15-foot area where gravels were 4.5 to 5 feet thick and a 500- by 40-foot area of frozen gravels that were 11 to 15 feet thick. The top 1 to 4 feet of fractured bedrock was also sluiced and some of the gold in it was coarse and round. The auriferous gravels contain subrounded, shale and graywacke clasts and some well-rounded, lava and diorite clasts. The lava and diorite clasts in the stream gravels may have been derived from Quaternary or Tertiary gravels capping Gold Hill in the headwaters of this drainage (Richter and Jones, 1973). The Quaternary or Tertiary gravels on Gold Hill are reported to be gold-bearing (Moffit, 1954). Bedrock is only locally exposed in the channel of this drainage. It includes Jurassic or Cretaceous siliciclastic rocks and small intrusive dikes or plugs. Most of the creek reworks various Quaternary surficial deposits (Richter and Jones, 1973). At Gold Hill, the Chisana pluton intrudes Cretaceous volcanic and volcaniclastic rocks and this placer is one of several developed within or peripheral to the Chisana pluton (Richter and Jones, 1973; Richter and others, 1975).
|Geologic map unit||(-141.895029768059, 62.1155379400511)|
|Mineral deposit model||Placer Au (Cox and Singer, 1986; model 39a)|
|Mineral deposit model number||39a|
|Age of mineralization||Quaternary.|
|Workings or exploration||About 1.4 miles of Gold Run Creek upstream of its confluence with Glacier Creek has been placer mined for gold. Poorman Creek, a headwater tributary to Gold Run Creek, has also been placer mined over most of its 1 mile length (Richter and Jones, 1973). These placers were discovered in 1913 and mining took place intermittently until after WW II.|
|Indication of production||Yes; small|
|Production notes||Assuming a price of $20.00 per ounce, about 50,000 ounces of gold were recovered from placers in the Chisana area (Richter and others, 1975). Most of this production was from the Gold Run (this site) and Bonanza Creek (NB079) drainages and about half was produced between 1913 and 1915; some mining continued in the area up to the 1970s.|
Additional commentsThe mine is in the Wrangell-St. Elias National Preserve.
|MRDS Number||A011429; A011430|
Capps, S.R., 1915, Mineral resources of the Chisana-White River district: U.S. Geological Survey Bulletin 622-F, p. 189-228.
Capps, S.R., 1916, The Chisana-White River district, Alaska: U.S. Geological Survey Bulletin 630, 130 p.
Cobb, E.H., and Richter, D.H., 1980, Summaries of data on and list of references to metallic and selected nonmetallic mineral deposits in the Nabesna quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-927, 117 p.
Moffit, F.H., 1954, Geology of the eastern part of the Alaska Range and adjacent area: U.S. Geological Survey Bulletin 989-D, p. 65-218.
Richter, D.H., and Jones, D.L., 1973, Reconnaissance geologic map of the Nabesna A-2 quadrangle, Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I-749, 1 sheet, scale 1:63,360.
|Reporters||Travis L. Hudson (Applied Geology)|
|Last report date||11/24/2002|