 | | Journal (issue) | | MICHIGAN COPPER! The Mineralogical Record JANUARY-FEBRUARY 2023 ? VOLUME 54 ? NUMBER 1 ? $40 ... KRISTALLE Est.1971 Laguna Beach, California, USA • Tel: +1 949 494 5155 • Email: info@kristalle.com...........................3 by W. E. Wilson The Keweenaw County Fissure Mines.............................13 by C. J. Stefano The Cliff Mine, Keweenaw County, Michigan.........................................Stefano & P. Persson The Central Mine, Keweenaw County, Michigan......................................53 |  | | Journal (article/letter/editorial) | | bottom of Lake Superior near Eagle Harbor, Keweenaw County, Michigan. The near-shore find, now called the Laker...000–15,000 feet, and form the “spine” of the Keweenaw Peninsula. Interbedded with the basalt flows are twenty-two...Lankton 2006). In the central portion of the Keweenaw Peninsula the strike of the PLV changes from northeast...Tom Rosemeyer, a native of Upper Michigan, is a graduate of Michigan Technological University. He now...August 2008, Barron and Peterson left Calumet, Michigan, with Peterson’s 23-foot cabin cruiser in tow |  | | Journal (article/letter/editorial) | | COPPER-BEARING FISSURE VEINS Keweenaw County, Michigan Downloaded by [University of Delaware] at 05:05...leading to ore bins. On the left are ore cars of the Keweenaw Central Railroad being loaded with chunks of mass...as the Michigan Copper Country, is located on the scenic, rugged, and isolated Keweenaw Peninsula, which...into Lake Superior at the western end of Upper Michigan. The native copper mines that comprised the district...Houghton, and Keweenaw counties. The now-dormant copper mining industry of the Keweenaw Peninsula produced |  | | Journal (article/letter/editorial) | | The University of Michigan Mineral Collection Ann Arbor Downloaded by [University of Bristol] at 07:28...T he mineral collection at the University of Michigan is among the oldest and finest in the Great Lakes...prominent were those associated with the state of Michigan. A number of the specimens are pictured in the...of Michigan. No other mineralogical collection, save that of the A. E. Seaman Museum at Michigan Technological...University, is more important historically to Michigan. Although the collection continued to be an important |  | | Journal (article/letter/editorial) | | (covellite, digenite, and chalcocite), native copper, cuprite, carbonates (malachite and azurite), silicate (chrysocolla)...digenite, and covellite), native copper, oxide (cuprite), carbonates (malachite and azurite), silicate...digenite (Figs. 6h, 7d, e, 8a, b), and is replaced by cuprite (Figs. 7e, g, 9a, 10a, b). Covellite is closely...7h) and covellite (Fig. 7i) and is replaced by cuprite (Fig. 7i). It contains 80.5% Cu, 20.3% S, and traces...copper minerals, and usually surrounded by a rim of cuprite as its oxidation product (Figs. 8c-f). The native |  | | Journal (article/letter/editorial) | | MICROMOUNTING AT THE KEWEENAW PENINSULA, MICHIGAN By PAUL B. MOORE and RICHARD M. 6EGER Depr. of Geolophysical...UNIVERSITY] at 03:21 25 August 2017 INTRODUCTION The Keweenaw Feninsula is well-known for its fine specimens...minerals are the best found anywhere in the Keweenaw Peninsula. PUMPELLYITE (6Ca0.3Al 2 0 3 .7Si0 2 .4 H...amounts in nearly every other mine throughout the Peninsula. ROCKS AND MINERALS Downloaded by [JAMES COOK...good xls; forming the base for natrolite xls at Keweenaw Point in soft amygdaloidal basalt; Kearsarge Mine |  | | Journal (article/letter/editorial) | | favorite site for collecting microcrystals in the Keweenaw. The crystals occur in small vugs in prehnitequartz...occur in microcrystals and include brochantite, cuprite, langite, malachite, and posnjakite. Point Prospect...“Clearly this is the finest malachite known from Michigan.” Chalcocite has also been found as microcrystals...Superior on the north side of the Keweenaw Peninsula from Eagle River to Keweenaw Point. Numerous calcite veins...Mendota mine was one of the few localities in the Keweenaw that developed a chalcocite-bearing vein. Supergene |  | | Journal (article/letter/editorial) | | Iuyw I , < h,,,rl,rp,, ,,I I r,,,,l>,l\ T HE MICHIGAN COPPER DISTRICT stretches in a southwest-northeast...southwest-northeast direction along the western Upper Peninsula for approximately 100 miles, from the White Pine mine...mine in Ontonagon County to Copper Harbor in Keweenaw County. Copper mineralization occurs in two types...the scientific world. From 1844 through 1995 the Michigan copper district produced a reported 14,595,357...worldclass native-copper deposits of the Keweenaw Peninsula and the sediment-hosted stratiform copper |  | | Journal (article/letter/editorial) | | discovered in 1844, is located on the Keweenaw Peninsula of Upper Michigan in the heart of the "Copper Country...mining operation and made it the first mine on the "Keweenaw" to pay dividends to stockholders. Throughout... N ative copper was first mined on the Keweenaw Peninsula several thousand years ago by Native Americans...three mineral tracts on the northern part of Keweenaw Peninsula. After examining the copper prospect near...saying that Tom Rosemeyer, a native of Upper Michigan, started his mining career with Calumet and Hecla |  | | Journal (issue) | | of native copper in the Quincy mine ca. 1918. (Michigan Technological University Archives, Houghton) ...Donald Pearce (1941-1989) The “Copper King” The MICHIGAN COPPER COUNTRY L. W i l s o n New Mexico Bureau...t a n l e y J. D y l II Seaman Mineral Museum Michigan Technological University % 1992 T h e M in e...crystal group, 13.6 cm, from an unknown mine in the Michigan Copper Country. Richard A. Kosnar collection;...wrote the classic work on the copper deposits of Michigan in 1929. Photo by Wendell E. Wilson. TENT . |  | | Journal (article/letter/editorial) | | oxygen fugacities below the stability limit of cuprite and at least 3 log units above the magnetitehematite...deposits in the world are located on the Keweenaw Peninsula of Michigan. Roughly 5 million tons of refined...located along a 100-km-long zone within 3 km of the Keweenaw fault (Butler and Burbank, 1929; Broderick et...are similar to the ore-forming process in the Keweenaw district. The age of the Portage Lake basalt and...included among the 750 (!) papers published on the Keweenaw district (White, 1968), and there is general agreement |  | | Journal (article/letter/editorial) | | K EWEENAW I - COUNTY, -~ __ -- ---K--- MICHIGAN Tom Rosemcyer n 1990 dodecahedra1 and 45 feet...decaie in the Upper tip of the Keweenaw Peninsula Peninsula. in northern Michigan. The vein History outcrop...the original patina of azurite, malachite, and cuprite (clow-up view in flg. 6). The specimen waa recovered...material to Ken Flood, owner of Keweenaw Gem & Gift, Inc., in Houghton, Michigan. When Flood inquired as to...say that it was found near Copper Harbor, L Keweenaw LmESu?~OB OO?PMb DISTRIOT County Copper Harbor |  | | Journal (article/letter/editorial) | | Alabama. 40 ROCKS & MINERALS pseudomorphs after cuprite, aragonite, azurite, calcite, chalcocite, chalcopyrite...frequently associated with silver, chalcocite, cuprite, malachite, azurite, tenorite, and a variety of...states and the copper district of Michigan’s Keweenaw Peninsula. Unusually fine copper specimens were found...pit. Some Bisbee copper is pseudomorphous after cuprite, and copper coated with silver has been reported...the Ahmeek No. 2 mine near Copper City, Keweenaw County, Michigan. Its interesting history can be traced |  | | Journal (article/letter/editorial) | | Calumet, Michigan 49913 tajmahal@gilanet.com History and Mineralogy of the Manganese Mine Keweenaw County...County Michigan Tom Rosemeyer, a native of Upper Michigan, is a graduate of Michigan Technological University...March 2015 L ocated in the rugged Keweenaw Peninsula of Upper Michigan are two small manganese oxide deposits...Superior copper district in Ontonagon, Houghton, and Keweenaw counties. The copper-bearing Portage Lake Volcanics...deposits starts with attention brought to the Keweenaw Peninsula by Houghton. Af500 ROCKS & MINERALS ter |  | | Journal (article/letter/editorial) | | Copper-bearing Amygdaloidal Lode Houghton and Keweenaw Counties, Michigan TOM ROSEMEYER PO Box 369, 506 Pine Street...the secondmost-productive lode discovered in the Michigan copper district. In the heyday of mining it became...the A. E. Seaman Mineral Museum on the campus of Michigan Technological University will let you relive the...Tom Rosemeyer is a native of Upper Michigan and a graduate of Michigan Technological University in Houghton...researches the mineralogy and mining history of the Michigan copper district and the San Juan Mountains, Colorado |  | Arena, K.R., Hartmann, L.A., Baggio, S.B. (2014) Geological controls of copper, gold and silver in the Serra Geral Group, Realeza region, Paraná, Brazil. Ore Geology Reviews, 63. 178-200 doi:10.1016/j.oregeorev.2014.05.005 | Journal (article/letter/editorial) | | chrysocolla and malachite associated with copper and cuprite (Figs. 5a, b, 6c). Sandstone occurs as angular...consists mainly of copper oxides (tenorite and cuprite), chrysocolla, malachite, azurite and native copper...contain native copper, chrysocolla, azurite and cuprite (38-98 vol. %), making a reserve of 75,419 t. Abram...province (Prinz, 1967), 125 ppm in the Keweenaw lavas of Michigan (Prinz, 1967), 125 ppm in the Karroo... ACCEPTED MANUSCRIPT 11 cuprite (Figs. 5a, b, 6c). Copper and cuprite fill amygdales and veins and |  | | Book | | Mineralogy of Michigan by E. W. Heinrich updated and revised • by George W. Robinson M By E W~ Hellnr]ch...Museum Michigan Technological University Houghton, Michigan 49931 2004 © MINERALOGY OF MICHIGAN 3 FOREWORD...FOREWORD Michigan has a long and varied geologic history that includes repeated episodes of volcanism...before the first Europeans set foot here. When Michigan became a state in 1837, one of the first actions...and we continue to learn more about them today. Michigan minerals helped to build the state and nation |  | | Journal (article/letter/editorial) | | MICHIGAN COPPER COUNTRY Figure 1: Shaft house of the Ahmeek mine, Keweenaw County. 1962 photo by Terry...been and probably never will be anything like the Michigan Copper Country. For the mineral-minded, it is...Chicago in the Keweenaw Peninsula, which sticks like a thumb from Michigan's Upper Peninsula into the cold...figures as Henry Schoolcraft, who explored the peninsula in 1820, and to Douglass Houghton, who made the...the first systematic explorations on which Michigan laid its claim to the region. Houghton lost his life |  | | Report (issue) | | meteorites. Association: Silver, chalcocite, bornite, cuprite, malachite, azurite, tenorite, iron oxides, many...Distribution: Occurs in many districts world-wide. In the USA, as remarkably large masses and excellent, large...crystals in deposits of the Keweenaw Peninsula, Keweenaw and Houghton Cos., Michigan; in several porphyry copper |  | | Journal (article/letter/editorial) | | western part of Ontonagon County, Michigan. The area is accessible by Michigan Highway 64, which winds through...from Mellen, Wisconsin, to the tip of the Keweenaw Peninsula, a distance of 160 miles. The White Pine...world-famous native-copper deposits of the Keweenaw Peninsula. The main ore mineral in the sulfide deposit...courtesy Ruth Ristola. White Pine Mine gon County, Michigan Volume 74, MaylJune 1999 161 Downloaded by...June 2016 Figure 2. A generalized map of the Michigan copper district. The enlarged area shows the structural |  | Ikehata, Kei, Chida, Kohsuke, Tsunogae, Toshiaki, Bornhorst, Theodore J. (2016) HYDROTHERMAL NATIVE COPPER IN OCEAN ISLAND ALKALI BASALT FROM THE MINEOKA BELT, BOSO PENINSULA, CENTRAL JAPAN. Economic Geology, 111 (3) 783-794 doi:10.2113/econgeo.111.3.783 | Journal (article/letter/editorial) | | ISLAND ALKALI BASALT FROM THE MINEOKA BELT, BOSO PENINSULA, CENTRAL JAPAN Kei Ikehata,1,† Kohsuke Chida,2...Seaman Mineral Museum, Michigan Technological University, Houghton, Michigan 49931 Abstract Native copper... 20 Ma) in the southern Mineoka belt of Boso Peninsula, central Japan. The native copper was precipitated...near-economic levels, such as the Keweenaw Peninsula, northern Michigan and Paraná basaltic province, southern...oceanic island affinity from the Mineoka belt, Boso Peninsula, Japan. These data are used to present a genetic |  | | Report (issue) | | University University Michigan Townsend Drive Drive 1400Townsend 1400 Houghton, Houghton, Michigan Michigan49931-1...field trip trip to to the T. J. the Keweenaw Peninsula, Michigan: Institute on Lake Superior Geology...Geology Proceedings, Keweenaw Peninsula, Michigan: Institute on Lake Superior Geology Proceedings, 40th 40thAnnual..."Field Guide to the Geology Geology of the the Keweenaw Keweenaw Annual Institute Institute on on Lake Lake...Lake Superior Superior Geology Peninsula, Michigan" Michigan" (Bornhorst (Bornhorst and others, 1983) for |  | | Report (issue) | | the surface and between the nodular masses. The Michigan Bicentennial symbol (back cover) incorporates...Survey Division BULLETIN 6 THE MINERALOGY OF MICHIGAN by E. Wm. Heinrich Professor of Mineralogy and...University of Michigan Ann Arhor, Michigan Lansing, Michigan 1976 STATE OF MICHIGAN WILLIAM G. Mrr...State of Michigan CL '48 s.321.6. Printed by Speaker-Hines and Thomas, Inc., Lansing, Michigan. Available...of Natural Resources, P.O. Box 30028, Lansing, Michigan 48909 On deposf-t in public libraries, state |  | | Journal (article/letter/editorial) | | Mineral Museum Michigan Technological University 1404 E. Sharon Avenue Houghton, Michigan 49931 cjstefan@mtu...WILLIAM B. BARR JR. 1405 Hewett Drive Ann Arbor, Michigan 48103 wbarr@umich.edu Figure 1. Portrait of young...mine manager at various mines in Michigan’s Keweenaw Peninsula. A lover of the outdoors, Hubbard had the...curator of the A. E. Seaman Mineral Museum at Michigan Technological University. His interests span mineralogy...Mineral Museum, 10 cm tall, Cliff mine, Keweenaw County, Michigan. It is also a very unusual piece, being |  | | Journal (article/letter/editorial) | | anilite, yarrowite, rarely chalcopyrite) and cuprite. In addition to copper minerals, sphalerite and...simultaneous crystallization. Copper sulphides, cuprite, and barite micro veins indicate a later deposition...identified in some deposits [18–28]. Native copper, cuprite, and zincite are found in the Ayaguz agate deposit...an intergrowth with cristobalite spheroids and cuprite. Additionally, Radko [22] notes the presence of...Wolverine Mine, Wolverine, Houghton County, Michigan (USA) [19,21]. These unusual agates, which range |
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Keweenaw Peninsula, Michigan, USA