Michigan · Marquette County
Producer

Ropes Mine

Marquette County, Michigan, United States
GoldSilver
⌖ Show on mapUSGS source ↗
Description

Julius Ropes

Commodities
PrimaryGold, Silver
Commodity typeM
Deposit
Deposit typeStratabound, Stratiform
Model275: Low-sulfide Au-quartz, Archean
Deposit sizeU
Orebody formVERTICAL TABULAR LENS
Materials
Ore mineralsGold
GanguePyrite, Quartz, Calcite, Talc, Sericite
Geology
Host rockPhyllite · Kitchi Formation
StructureShear zones
AlterationSilicification, sericitization, pyritization, with subordinate chloritization
Economic & production
Development statusProducer
First production1882
Last production1989
Discovery year1880
Identification
Deposit ID10085023
MRDS IDW700455
RegionNA
Data scoreB
Coordinates46.53611, -87.73335
References
BORNHORST, T.J., SHEPECK, A.W., AND ROSSELL, D.M., 1986, THE ROPES GOLD MINE, MARQUETTE COUNTY, MICHIGAN, U.S.A. - AN ARCHEAN HOSTED LODE GOLD DEPOSIT, IN MACDONALD, A.J., ED., PROCEEDINGS OF GOLD '86, AN INTERNATIONAL SYMPOSIUM ON THE GEOLOGY OF GOLD: TORONTO, 1986, P. 213-227.BROZDOWSKI, R.A., GLEASON, R.J., AND SCOTT, G.W., 1986, THE ROPES MINE: A PYRITIC GOLD DEPOSIT IN ARCHEAN VOLCANICLASTIC ROCK, ISHPEMING, MICHIGAN, U.S.A., IN MACDONALD, A.J., ED., PROCEEDINGS OF GOLD '86, AN INTERNATIONAL SYMPOSIUM ON THE GEOLOGY OF GOLD: TORONTO, 1986, P. 228-242.MINING MAGAZINE, JANUARY 1989, P. 44.REED, R.C., 1991, ECONOMIC GEOLOGY AND HISTORY OF METALLIC MINERALS IN THE NORTHERN PENINSULA OF MICHIGAN; GEOLOGICAL SOCIETY OF AMERICA, SPECIAL PAPER 256, P. 21-24.JOHNSON, A.M. AND GROTH, E.H., 1998, INVENTORY OF UNDERGROUND MINES, MARQUETTE COUNTY, P. 411-415, SITE ID 520020, MICHIGAN DEPARTMENT OF NATURAL RESOURCES.LINES 15-17: BROZDOWSKI AND OTHERS, 1986, P. 228; LINES 18-19: BORNHORST AND OTHERS, 1986, P. 213.LINE 1: BROZDOWSKI AND OTHERS, 1986, P. 228; LINE 2: BORNHORST AND OTHERS, 1986, P. 213.