 | | Journal (article/letter/editorial) |
| 1.1 Ga Midcontinental Rift of the Keweenaw Peninsula, Michigan, USA Ria L. Mitchell a,∗ , Nathan D. Sheldon...of Michigan, 2534 CC Little Building, 1100 North University Avenue, Ann Arbor, MI 48109-1005, USA b ...debris flow sedimentary rocks from the Keweenaw Peninsula (Michigan, USA) are geochemically characterized to...lithologically-varied range of localities across the Keweenaw Peninsula, Michigan. Provenance indicators such as Ti/Zr... 2005). Most of the previous work on the Keweenaw Peninsula has focused on either economic geology of |
 | | Journal (article/letter/editorial) |
| Survey, National Center-MS 954, Reston, VA 22092, USA (Received October 10, 1990; accepted after revision...Survey, National Center--MS 954, Reston, VA 22092, USA. tinent rift system (MRS) of North America is one...the famous native copper deposits of the Keweenaw Peninsula, the stratiform copper sulfide and native... ONIARIO WISCONSIN 3.6-1.85 1.85 'li'J i MICHIGAN ILLINOIS 1.5-1.4 i i 1.1 j ' i IZ IIII i...Locationof the rift south of LakeSuperiorin Minnesota,Michigan,Wisconsin,Iowa, Nebraska, and Kansas is inferred |
 | | 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) |
| 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) |
| 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...produced spectacular specimens of crystallized native silver and copper that now enrich museums and private... 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 |
 | | 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 |
 | | Journal (article/letter/editorial) |
| Figure 1. Map showing Hancock where the float silver that was recovered from the glacial till was found;...Caledonia Street Calumet, Michigan 49913 datolite@charter.net An UNUSUAL Glacial Silver Find In Michigan’s...Michigan’s Keweenaw Peninsula Twenty-third in a series of articles on the mines and minerals of Michigan’s Copper...Copper Country F loat copper and silver are defined as chunks of those native metals that have been...formed to where they would ultimately be found. In Michigan this took place during multiple periods of continental |
 | | Journal (article/letter/editorial) |
| The Mineral Collection of Bloomfield Hills, Michigan JOHN M. ZAWISKIE Cranbrook Institute of Science...Science 39221 Woodward Avenue Bloomfield Hills, Michigan 48303 jzawiskie@cranbrook.edu C ranbrook Institute...miles northwest of downtown Detroit in southeast Michigan and attracts approximately 175,000 visitors per...Standish Backus family; all were members of the Michigan Mineral- ogical Society (MMS), which was established...2017 39 Figure 4. Silver, 23 cm, Keweenaw mining district, Houghton County, Michigan, Robert Heinsleigh |
 | | Journal (article/letter/editorial) |
| 57647 Caledonia Street Calumet, Michigan 49913 datolite@charter.net Keweenaw Figure 1. A delicate group...Copper Country Figure 2. Generalized map of the Michigan copper district showing the location of the new...Mineral Finds in Michigan’s Copper Country T he Michigan Copper Country, also known as the Lake Superior...scenic Keweenaw Peninsula, which juts out into Lake Superior at the western end of Upper Michigan. The...Tom Rosemeyer, a native of Upper Michigan, is a graduate of Michigan Technological University in Houghton |
 | | Journal (article/letter/editorial) |
| favorite site for collecting microcrystals in the Keweenaw. The crystals occur in small vugs in prehnitequartz...on the dumps. Many of the vugs contain copper, silver, and chalcocite crystals that occur perched on...“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) |
| From Michigan’s Keweenaw Peninsula TOM ROSEMEYER 57647 Caledonia Street Calumet, Michigan 49913 datolite@charter...Copper Country Native copper as well as native silver and a variety of gangue minerals were deposited...Tom Rosemeyer, a native of Upper Michigan, is a graduate of Michigan Technological University in Houghton...This was in October 1962 when I and two other Michigan Tech students were collecting in the underground...spend about six snow-free months living in the Keweenaw. I do a lot of collecting during the time I’m |
 | | 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) |
| Copper-bearing Amygdaloidal Lode Houghton County, Michigan Lake Superior Native Copper District Sixteenth...TOM ROSEMEYER 57647 Caledonia Street Calumet, Michigan 49913 datolite@charter.net T he Lake Superior...Superior native copper district, also known as the Michigan Copper Country, is located on the sparsely populated...scenic Keweenaw Peninsula that juts out into Lake Superior near the western end of Upper Michigan. The...The Keweenaw winters can be long and cold with lake-effect snow accumulations of 200–300 inches not uncommon |
 | | Journal (issue) |
| Curator, NMBG&MR. 2017 Silver/Copper Finds in Michigan's Keweenaw Peninsula Tom Rosemeyer tajmahal@gilant...ng has come to an end in Michigan 's beautiful and scenic Keweenaw Peninsula (Copper Country). The wintry...on page 3) Figure 1. Jeremy Kerttu holding the silver/copper float that he discovered near an old stone...stone house foundation in Baltic, Houghton County, Michigan. The chunk was buried about 8 inches down in compacted...- - - - - - - - - - - - - - - - - - 3 Copper/Silver Finds (Cont inued from page I) Mineral collecting |
 | | 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... along with small amounts of native copper and silver that occur mainly as fine grains in the cupriferous...billion pounds of copper and 45 million ounces of silver. The deposit was a disappointment to mineral collectors |
 | | Journal (article/letter/editorial) |
| George Robinson, Michigan Technological University. neW DATA On MIneRALs fROM THe KeWeenAW cOPPeR DIsTRIcT...material from several former mines on the Keweenaw Peninsula, Michigan, has revealed the presence of several...occurrence of anilite (Cu7S4) near Painesdale, Michigan (Heinrich and Robinson 2004), carbonate matrix...Baltic mine dump revealed crude wires of native silver associated with chalcocite, quartz, and minor barite...sulfide were noted closely associated with the native silver. The Cu-Ag sulfide is identical in overall appearance |
 | | Journal (article/letter/editorial) |
| Houghton and Keweenaw Counties, Michigan TOM ROSEMEYER 57647 Caledonia Street Calumet, Michigan 49913 datolite@charter...and Hecla Conglomerate in Houghton and Keweenaw counties, Michigan. Every summer in the Copper Country,...the mine dumps. The lucky person may also find silver in association with copper, and these specimens...Tom Rosemeyer, a native of Upper Michigan, is a graduate of Michigan Technological University in Houghton...565 I now spend six months of the year in the Keweenaw collecting minerals, doing research, and exploring |
 | | 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...material of interest besides the usual copper and silver. With mounting discouraging trips, we endeavored...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 |
 | | 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 |
 | | Journal (article/letter/editorial) |
| Exceptional Silver Vein in Michigan’s Keweenaw Peninsula TOM ROSEMEYER Figure 1. The best silver/copper specimen...7.0 cm and is composed of silver and lesser amounts of copper. The silver/copper was encased in weathered...(October 2017). 57647 Caledonia Street Calumet, Michigan 49913 datolite@charter.net Twenty-sixth in a...native silver vein located in Keweenaw County, Michigan, was made by Doug Miller of Calumet, Michigan. Miller...several important discoveries of concealed copper/silver-bearing veins and has recovered tons of “float |
 | | 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...rim of felsite cobbles and boulders. Copper and silver were infrequently found as arborescent crystal |
 | | Journal (article/letter/editorial) |
| Rock-Hosted Stratiform Copper Deposit, Upper Peninsula, Michigan Theodore J. Bornhorst1,† and William C. Williams2...Mineral Museum, Michigan Technological University, 1404 E. Sharon Avenue, Houghton, Michigan 49931 2 Orvana...Copperwood is located in Gogebic County, Upper Peninsula, Michigan, within the Porcupine Mountains copper district...discovery of native Cu in the western Upper Peninsula, Michigan, during the 1840s led to the first mining...social contribution to the region. The Upper Peninsula not only hosts stratiform/strata-bound copper |
 | | Journal (issue) |
| epithermal, bulk-mineable precious-metal (gold and silver) deposits, which were mined by Cactus Gold Mines/CoCa...440,000 ounces of gold and 5.3 million ounces of silver were extracted from the deposits at Middle Buttes...concentration of gold of0.043 oz/ton 0.4 oz/ton of silver. Open-pit and heap leaching methods were used to...summerof 1988. Coming from the Copper Country at Michigan Tech to the desert of southern California was...Mojave Desert since completing my M.S. thesis at Michigan Tech. However, given the widespread occurrence |
 | | 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...414 ROCKS & MINERALS Figure 3. One of the best silver specimens in the collection of the A. E. Seaman |
 | | Report (issue) |
| VOLCANICS (MIDDLE KEWEENAWAN) ON ISLE ROYALE, MICHIGAN Prepared in cooperation with the National Park...Isle Royale, Michigan By N. KING HUBER GEOLOGY OF ISLE ROYALE NATIONAL PARK, MICHIGAN GEOLOGICAL SURVEY...-···-·--· 2 The Portage Lake Volcanics on the Keweenaw Peninsula__ 3 The Portage Lake Volcanics on Isle...-Correlation between Isle Royale and the Keweenaw Peninsula ----------------------------------------...middle and upper Keweenawan rocks of northern Michigan and adjacent parts of Wisconsin-------------- |
Cliff Mine, Allouez Township, Keweenaw County, Michigan, USA