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| 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 |
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| University University Michigan Townsend Drive Drive 1400Townsend 1400 Houghton, Houghton, Michigan Michigan49931-1...J. the Keweenaw Peninsula, Michigan: Institute on Lake Superior Geology Proceedings, Keweenaw Peninsula...Peninsula, Michigan: Institute on Lake Superior Geology Proceedings, 40th 40thAnnual AnnualMeeting, Meeting..."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 |
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| filling from a basaltic Houghton County lava flow. Small specks of native copper occur as inclusions near the...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 |
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| PrOlitleEt - K EWEENAW I - COUNTY, -~ __ -- ---K--- MICHIGAN Tom Rosemcyer n 1990 dodecahedra1...decaie in the Upper tip of the Keweenaw Peninsula Peninsula. in northern Michigan. The vein History outcrop...The fissure vein that is exposed in the of Copper Harbor and has produced Some glaciated outcrop, which...of the largest copper crystals found in the on the bedrock geology map of tbe Fotr Copper Country. Nearly...vein at Point pmpect showing copper crystals in the siUcilled prehnite veln. Photo by John Raeroaa (July |
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| with a large mass of native copper in the Quincy mine ca. 1918. (Michigan Technological University Archives...of Donald Pearce (1941-1989) The “Copper King” The MICHIGAN COPPER COUNTRY L. W i l s o n New Mexico...t a n l e y J. D y l II Seaman Mineral Museum Michigan Technological University % 1992 T h e M in e...COVER: Native copper crystal group, 13.6 cm, from an unknown mine in the Michigan Copper Country. Richard...Burbank) wrote the classic work on the copper deposits of Michigan in 1929. Photo by Wendell E. Wilson. |
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| Michigan Mineralogy: A LOCALITY INDEX TOM MORRIS, JR. 4553 Shenandoah Allen Park, Michigan 48101 Tom...occurrences. These localities have been listed by county; and, strictly for convenience, the list has been...compiling this information was The Mineralogy of Michigan (Heinrich, 1976), which should be consulted by...locality labeling of Michigan specimens. It should be pointed out that the list of Michigan mineral localities...None theless, with the aid of a good state or county map, plus local inquiries, the list could be helpful |
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| for Native Copper in Northern Wisconsin A Theoretical Basis for Exploration for Native Copper in Northern...SURVEY Certain geologic characteristics of the Michigan copper district can provide exploration guides for...to younger lavas of Michigan and Wisconsin ._________ _ _ Shows of native copper or chalcocite _____...lithology__________________ Paleohydrology of the copper deposits _______ Degree of metamorphism _____________...of lava accumulation ______ Areas favorable for copper in hypothetical lava basins _________________ Hypothetical |
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| 1437–1444 GENESIS OF NATIVE COPPER LODES IN THE KEWEENAW DISTRICT, NORTHERN MICHIGAN: A HYBRID EVOLVED METEORIC... Canada H3C 3A7 Abstract The Keweenaw Peninsula of northern Michigan is well known for early diagenetic...diagenetic sulfide-dominant sediment-hosted stratiform copper mineralization hosted mainly by basal siltstone-shale...Formation in the White Pine district, and later native copper lodes hosted mainly by flow-top breccias and amygdaloidal...stratigraphically lower Portage Lake Volcanics. The native copper mineralization is generally attributed to downdip |
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| 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...gemgypsy@bellsouth.net JANUARY–FEBRUARY 2023 Articles Copper Country II Introduction..............................................3 by W. E. Wilson The Keweenaw County Fissure Mines.................................13 by C. J. Stefano The Cliff Mine, Keweenaw County, Michigan...................................... |
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| February 2015 Figure 2. A generalized map of the Michigan copper district showing the location of new finds...Besse. arborescent copper crystal groups cached at the Central mine town site, (2) copper crystals recovered...at the Gull Rock fissure vein, (3) hundreds of copper from the Indiana mine, and (4) more than two hundredV...localities are arranged geographically, starting with Keweenaw Point and continuing in a southwestern direction...end of the district. Keweenaw Point, Keweenaw County The waters off Keweenaw Point have drawn much attention |
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| OF NATIVE COPPER LODES FROM A TECTONICALLY INDUCED THERMAL PLUME OF ORE FLUIDS ON THE KEWEENAW PENINSULA...PENINSULA, NORTHERN MICHIGAN ALEX C. BROWN†,* Department of Civil, Geological and Mining Eng., École Polytechnique...Quebec, Canada H3C 3A7 Abstract Economic native copper lodes in the Lake Superior district are confined...45-km-long portion of the Portage Lake Volcanics on the Keweenaw Peninsula, despite similar host rocks extending...strata may be attributed to upward thrusting on the Keweenaw fault during closure of the Midcontinent rift |
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| the Copper Falls mine, this complex 3.2-cm crystal is perched on a matrix of crystallized copper. The...Figure 49. Perhaps the finest cubic copper crystal recovered in the Copper Country in recent times. The 1...level of the Gribble vein in the Copper Falls mine. Of all the copper specimens recovered from the clay...the finest calcite crystals recovered from the Copper Falls mine in the early days of mining. The sharp...striking contrast with the rugged surface of the copper matrix. The specimen was part of the L. L. Hubbard |
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| 64-66 Supt.of Docs. No.: 119.3:1309 1. Geology-Michigan-Isle Royale National Park-Guide-books. I. Title...Lake Volcanics ______ Rock Harbor-Tobin Harbor area __________ Washington Harbor area_______________ An ancient...ancient alluvial fan the Copper Harbor Conglomerate ________ Tilting and breaking the rocks _____________...minerals of special interest ____________ Native copper widespread but not abundant ____ Chlorastrolite...Chlorastrolite Michigan's state gem __________ Prehnite the little pink pebbles _____________ Agate an array of colors |
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| "KEWEENAW—COPPER COUNTRY By JOE ROTHSTEIN 255 West 84th Street, New York 24, N. Y. Keweenaw! in the...Bridge. In all the mitted. Inquiries to clubs in Michigan rugged beauty that makes up Michigan's were not...cipal of the high school in nearby Nethe native copper would be exposed. gaunee, to expect us on Monday...paradise and Copper Harbor at the very tip of even when they speak of the harshness Keweenaw where Brockway...mountains of northern "Where?", and she said, "Michigan," Pennsylvania, stopping off to see the deep and |
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| Lakes States Wisconsin, Indiana, Illinois, Michigan, by June Culp Zeitner $5.95 Gem Guides Book...which operate in many states are not as likely to grant permission to collect as the former locally owned... and Michigan. Dow Chemical has reported finding diamonds in the kimberlites of upper Michigan, and vast...shoreline on both Lake Superior and Lake Michigan. Michigan is the state with the most shoreline on these...fresh water seas, with waters of Lake Superior, Michigan and Huron virtually surrounding it. Illinois and |
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| Lake Superior copper deposits, home to the world’s largest occurrence of native copper. Indeed, many...sport flecks of native copper, and specimens exist of datolite intergrown with copper crystals, but that’s...that’s getting ahead of the story. Michigan’s Copper Country datolite has been collected, prized, fashioned...in celebrating the rich mineral heritage of the Keweenaw Peninsula’s datolite by diving into this article...Dyl II, Director A. E. Seumnii Mineral Museum Michigan Technological University 170 ROCKS 81MINERALS |
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| is located on the Keweenaw Peninsula of Upper Michigan in the heart of the "Copper Country." The huge...huge masses of native copper, up to 100 tons, that were encountered turned the Cliff into a successful mining...mining operation and made it the first mine on the "Keweenaw" to pay dividends to stockholders. Throughout...silver and copper that now enrich museums and private collections the world over. N ative copper was first...first mined on the Keweenaw Peninsula several thousand years ago by Native Americans using crude fire-quenching |
 | Bodden, Thomas, Bornhorst, Theodore, Bégué, Florence, Deering, Chad (2022) Sources of Hydrothermal Fluids Inferred from Oxygen and Carbon Isotope Composition of Calcite, Keweenaw Peninsula Native Copper District, Michigan, USA. Minerals, 12 (4) 474 doi:10.3390/min12040474 | Journal (article/letter/editorial) |
| Composition of Calcite, Keweenaw Peninsula Native Copper District, Michigan, USA Thomas J. Bodden 1 , Theodore...Composition of Calcite, Keweenaw Peninsula Native Copper District, Michigan, USA. Minerals 2022, 12, 474...Engineering and Sciences, Michigan Technological University, Houghton, MI 49931, USA; tjbodden@mtu.edu (T...Seaman Mineral Museum, Michigan Technological University, Houghton, MI 49931, USA Department of Earth Sciences...world’s largest accumulation of native copper in Michigan’s Keweenaw Peninsula. During a regional metamo |
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| Copper-banded Agates Downloaded by [Lulea University of Technology] at 07:04 23 August 2013 Copper-bearing...Lode Houghton County, Michigan TOM ROSEMEYER 57647 Caledonia Street Calumet, Michigan 49913 datolite@charter...using a pinpoint body-scan metal detector to locate copper-bearing agates in chunks of the dense basalt matrix...author’s collection D Figure 2. A 1.1 × 1.2-cm copper-banded agate in the typical dense basaltic matrix...hosts the agates. The amygdule shows a partial copper rim and attractive banding in the agate itself |
 | Olds, Travis A., Carlson, Shawn M., Behnke, Dan, Mills, Owen P. (2014) Collector's Note: A New Find of Manganese-rich Pumpellyite from the Manganese Mine, Copper Harbor, Keweenaw County, Michigan. Rocks & Minerals, 89 (6) 548-553 doi:10.1080/00357529.2014.949177 | Journal (article/letter/editorial) |
| C ollector’s Note THE STATE OF MICHIGAN Downloaded by [Northeastern University] at 12:45 28 February...minerals in the altered [Michigan] copper lodes for the Calumet and Hecla Copper Mining Company, noted a...Pumpellyite From the Manganese Mine, Copper Harbor, Keweenaw County, Michigan 548 ROCKS & MINERALS See also...also Palache and Vassar (1925). In 1973, Michigan adopted the compact, massive green variety of pumpellyite...commonly referred to in Michigan as “Isle Figure 1. Map of Michigan’s Keweenaw Peninsula showing the location |
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| Survey, National Center-MS 954, Reston, VA 22092, USA (Received October 10, 1990; accepted after revision...1 ) native copper deposits in basalts and interflow sediments; (2) sediment-hosted copper sulfide and...and native copper; (3) copper sulfide veins and lodes hosted by rift-related volcanic and sedimentary rocks;...hydrothermal sulfides occur (i.e., shale-hosted copper sulfides), the source of sulfur was local sedimentary...Survey, National Center--MS 954, Reston, VA 22092, USA. tinent rift system (MRS) of North America is one |
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| very low-grade metamorphic rocks, Keweenaw Peninsula Michigan, USA Edward Hansen a,⁎, Jesse Reimink a...Hope College, 35 E 12th Street, Holland, Michigan 49423 USA Section 3.3 Chemistry and Physics of Earth...metamorphism Titanite TiO2 Pseudorutile Keweenaw Peninsula Prehnite–pumpellyite-facies a b s t r a c t Titanite...clasts from the Keweenaw Peninsula, Michigan, USA which were metamorphosed to the prehnite– pumpellyite...case, pseudorutile was able to persist through prehnite–pumpellyite metamorphism suggesting that it can |
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| TOM ROSEMEYER 57647 Caledonia Street Calumet, Michigan 49913 datolite@charter.net All mineral photography...Mineralogy of the St. Louis Mine Houghton County, Michigan Twentieth in a series of articles on the...and minerals of Michigan’s Copper Country Figure 2. An exceptional copper-included agate, measuring 0...central circular red banding contains micro-sized copper inclusions; the rim of the agate contains more...about 1.3 miles east of the village of Laurium, Michigan. This little-known locality is seldom visited |
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| COPPER-BEARING FISSURE VEINS Keweenaw County, Michigan Downloaded by [University of Delaware] at 05:05...05:05 09 June 2012 Lake Superior Native Copper District Fifteenth in a series of articles on the mines...Michigan’s Copper Country 298 ROCKS & MINERALS Figure 1. Considered by some to be the finest copper specimen...specimen in the world, this 6 × 8-cm crystallized copper specimen came from the Central mine and was in the...and the piece is now on display in the special Copper Country collection case; Jeff Scovil photo. Downloaded |
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| THE KEARSARGE Copper-bearing Amygdaloidal Lode Houghton and Keweenaw Counties, Michigan TOM ROSEMEYER...Figure 1. A classic group of free-growing, complex copper crystals, measuring 5.5 × 10.0 cm, attributed to...articles on the mines and minerals of Michigan’s Copper Country Downloaded by [Columbia University] at...KEARSARGE LODE was one of seven blanket-type native copper orebodies that were mined in the brecciated amygdaloidal...secondmost-productive lode discovered in the Michigan copper district. In the heyday of mining it became |
Clark Mine, Copper Harbor, Grant Township, Keweenaw County, Michigan, USA