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• USGS Sci8ncb for a Changing World Names Is for Descriptive Purposes Only and Does Not Imply Endorsement by the U.S ;.• ~. '1. " ,r-=====~=============================================== ~ u.s. Department of the Interior - U.S. Geological Survey McCarthy quadrangle Descriptions of the mineral occurrences shown on the accompanying figure follow. See U.S. Geological Survey (1996) for a description of the information content of each field in the records. The data presented here are maintained as part of a statewide database on mines, prospects and mineral occurrences throughout Alaska. I, ! •. ~ ........ \. .. ,... {~' MC~?MCO~~::·:>::·:::·~>·"fN.(~~!y,~r, ·.tJ/C034 ' ) ·.M.C032 ( .• MC::,033 . -. --, ...... ,/' ", .MC010 MC062 , MC061~ '. "\ :'-'MG['15 \, 61' '-;----111~!.&.._::::::::::::..---_l ___.::_ __...L __ .:::.::;:....::2zr::::::::......::: 61' 144' 141' Distribution of mineral occurrences in the McCarthy 1:250,OOO-scale PROPERlY Of . quadrangle, eastern Alaska 5 LIBRARY This and related reports are accessible through the USGS World Wide Web siDG6 http:j jwww-mrs-ak.wr.usgs.govjardf. Comments or information regarding corrections or missing data, or requests for digital retrievals should be directed to Donald Grybeck, USGS, 4200 University Dr., Anchorage, AK 99508-4667, e-mail [email protected], telephone (907) 786-7424. This compilation is authored by: Donald Richter U. S. Geological Survey 4200 University Drive Anchorage, AK 99508-4667 ''\ ..' ....... '-'-... ~ LocMion 01. IIlJ.p area in Al.aska This report is preliminary and has /lot been reviewed for conformity with U.S. Geological Survey editorial standards or with the North American Stratigraphic code. Any use of trade, product, or firm • USGS sci8nCB for a changing world names is for descriptive purposes only and does not imply endorsement by the U.S. Government. OPEN-FILE REPORT 98-227 ~!.,",-" ,~, , ~laska Resource Data File Pagel Site name(s): Valdez; Nugget Creek Site Type: Mine ARDF no. MCOO 1 Latitude: 61.65 Quadrangle: MC C-8 Longitude: 143.717 Location description and accuracy: On slopes north-northwest of the toe of Kuskulana Glacier. Best location: MacKevett and others, 1978, loco 18. Accurate within radius of 100 feet. Commodities: Main: Ag, Cu Other: Ore minerals: Bornite, chalcopyrite Gangue minerals: Quartz Geologic description: Quartz vein more than 1 m thick containing bornite, chalcopyrite, and pyrite. Vein occurs along fault in Upper Triassic Nikolai Greenstone. Slablike copper nugget weighing several tonnes found as float in Nugget Creek near workings. Alteration: More than 1,200 m underground workings to depths of over 125 meters. Grade decreased with depth. Grab sample assayed >200 g/t Au, >2 percent Cu (MacKevett, 1976). Workings/Exploration: More than 1,200 m underground workings to depths of over 125 meters. Grade decreased with depth. Grab sample assayed >200 g/t Au, >2 percent Cu (MacKevett, 1976). e of mineralization: Cretaceous? Deposit model: Vein Deposit model number (After Cox and Singer, 1986 or Bliss, 1992): Production: Yes: small Status: Inactive Production notes: Development and production from 1916 to 1919. Produced 145 tonnes ore and concentrate ' Reserves: Additional comments: References: Moffit and Maddren, 1908; Moffit and Maddren, 1909; Moffit and Mertie, 1923; Van Alstine and Black, 1946; MacKevett, 1976, loco 139; MacKevett and others, 1978, loco 18. Primary reference: Moffit and Mertie, 1923 ~ ,Alaska Resource Data File Page 2 Reporter: Nokleberg, W.J., Richter, D.H. Reporter affiliation: USGS Last report date: 7/11/97 " I Waska Resource Data File Page 3 Site name(s): London and Cape Site Type: Prospect ARDF no. MC002 Latitude: 61.567 Quadrangle: MC C-8 Longitude: 143.717 Location description and accuracy: West side of Trail Creek, a tributary to the Kuskulana River. Best Location: MacKevett and others, 1978, loco 33. Accurate within radius of 100 feet. Commodities: Main: Cu Other: Ag, Mo Ore minerals: Chalcopyrite Gangue minerals: Geologic description: Pyrite-chalcopyrite vein lets and disseminations in locally altered Upper JUrassic granodiorite and quartz diorite that intrudes Mesozoic sedimentary rocks. Alteration: Workings/Exploration: Old adit. Grab samples assay as much as 1.5 ppm Ag, 20,000 ppm Cu, and 70 ppm Mo; most samples contained about 1,000 ppm Cu. Underground workings. Age of mineralization: Late Jurassic Deposit model: Porphyry Cu -Mo Deposit model number (After Cox and Singer, 1986 or Bliss, 1992): 21a Production: No Status: Inactive Production notes: Reserves: Additional comments: References: Moffit and Mertie, 1923; MacKevett, 1976, loco 129; MacKevett and others, 1978, loco 33. Primary reference: Moffit and Mertie, 1923 Reporter: Leonard, K.R., Elliott, R.L., Nokleberg, W.J., Richter, D.H. Reporter affiliation: USGS Last report date: 7/11/97 , aska Resource Data File Page 4 Site name(s): Kennicott Mine; Erie; ~umbo; Bonanza; Mother Lode Site Type: Mine ARDF no. MC003 Latitude: 61.528 Quadrangle: MC C-5 Longitude: 142.844 Location description and accuracy: Three miles northwest of town of Kennicott. Coordinates are for point at Jumbo, largest producer of Kennicott Mines. Other mines of Kennicott Complex are within 2 mi. of Jumbo and all are connected underground. Best location: MacKevett, 1970. Commodities: Main: Ag, Cu Other: Pb, Zn Ore minerals: Azurite, bornite, chalcocite, chalcopyrite, cinnabar, covellite, enargite, galena, luzonite, malachite, sphalerite, tennantite Gangue minerals: Geologic description: Kennicott mines were renowned for the size and richness of their copper sulfide lodes. The largest known ore body (Jumbo Mine) consisting of almost pure chalcocite and covellite averaged 360 ft in height, was between 2 ft arid 60 ft wide, and extended along its northeasterly plunge for 1,500 ft. Origin and geologic history of deposits is complex, obscure, and multiple hypotheses are still debated. Mainly chalcocite and covellite, with minor enargite, bornite, chalcopyrite, luzonite, and pyrite. Tennantite, sphalerite, and galena extremely rare. Local surface oxidation of sulfides to malachite and azurite. Sulfides occur mainly as large, irregular, massive, wedge-shaped bodies, mainly in dolomitic parts of the Upper Triassic Chitistone or Nizina Limestone. Gener-ally less than 100 m above the Middle and(or) Upper Triassic Nikolai Greenstone. One of the most productive group of mines in Alaska from 1913 until 1938 when the ore was exhausted. More than 96 km of underground workings. Deposits interpreted by Armstrong and MacKevett (1982) as having formed by mobilization of Cu from the underlying Nikolai Greenstone and deposited by oxygenated groundwater and deposition in fossil karsts of a dolomitic sabkha interface in overlying limestone. Age of deposition interpreted as Cretaceous(?) with formation during regional low-grade metamorphism. Alteration: Oxidation of deposits is not related to present land surface. Practically entire deposit has been partially oxidized even i:p deepest levels of mine. Oxidized minerals are malachite, azurite, limonite, covellite, antlerite, chalcanthite, cuprite, Cu arsenates, brochantite (?). Workings/Exploration: Mines located 4,000-6,000 ft elevation with over 700 mi in underground workings; lowest workings reached 2,800 ft elevation. Surface and underground workings. Age of mineralization: Cretaceous? Deposit model: Basaltic Cu Deposit model number (After Cox and Singer, 1986 or Bliss, 1992): 23 ....., laska Resource Data File Page 5 Production: Yes; large Status: Inactive Production notes: Produced about 544 million kg Cu and 280 million gAg from 4.3 million tonnes ore between 1913 and 1938. About 75 percent of ore mined was sulfide minerals of which 95 percent was chalcocite. ' Reserves: Additional comments: Minor production in late 1960' s from surface talus deposits. References: Bateman and McLaughlin, 1920; Miller and Moffit, 1946; MacKevett, 1970, GQ- 899; MacKevett, 1971; MacKevett, 1976; MacKevett and others, 1977; Cobb and MacKevett, 1980; Armstrong and MacKevett, 1982. Primary reference: Bateman and McLaughlin, 1920 Reporter: Elliott, R.L, Nokleberg, W.J., Richter, D.H. Reporter affiliation: USGS Last report date: 7/11/97 ~ ,Alaska Resource Data File Page 6 Site name(s): Nelson Site Type: Mine ARDF no. MC004 Latitude: 61.451 Quadrangle: MC B-4 Longitude: 142.383 Location description and accuracy: Near junction of Glacier Creek and Chitistone River. Best location: MacKevett and Smith, 1972. Accurate within radius of 100 feet. Commodities: Main: Cu Other: Ag Ore minerals: Bornite, chalcocite, chalcopyrite, covellite, en argite , malachite, native Cu, unknown Ag minerals. Gangue minerals: Calcite, dolomite, pyrite Geologic description: Prospect lies on NE limb of a broad NW-trending syncline cut by two major faults: a thrust fault striking about N 45 Wand dipping SW along which the Nikolai Greenstone has overridden a section of Chitistone Limestone; and a high-angle normal fault striking about N 25 E. Stringers and discontinuous masses of disseminated to massive chalcocite and covellite and minor enargite, bornite, chalcopyrite, malachite, and native copper as replacements of limestone and dolomite along steeply inclined narrow fissures and bedding planes. Prospect is in near-basal part of a faulted block of Upper Triassic Chitistone Limestone. Local faulting and shearing. Alteration: Workings/Exploration: Explored by surface pits and 5 short adits on 4 levels. About 1,100 ft of underground workings driven hetween 1929 and 1930; 3 adits were still accessible in 1951. Also explored by diamond drilling. Chip samples across massive sulfide veins assayed > 2 percent Cu,
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