NSTITUTE ON LAKE SUPERIOR EOLOGY May 12-15, Mountain Iron ... · Lavas-North Shore Volcanic Group...

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INSTITUTE ON LAKE SUPERIOR GEOLOGY www.lakesuperiorgeology.org Minnesota Geological Survey (U of M) Mark Jirsa Terry Boerboom Amy Radakovich Natural Resources Research Institute (U of M) George Hudak Dean Peterson Mesabi Range Geological Society (MRGS) Mark Severson Mehgan Blair May 12-15, 2020 Mountain Iron, Minnesota “Taconite Capital of the World ” PLANNING COMMITTEE

Transcript of NSTITUTE ON LAKE SUPERIOR EOLOGY May 12-15, Mountain Iron ... · Lavas-North Shore Volcanic Group...

Page 1: NSTITUTE ON LAKE SUPERIOR EOLOGY May 12-15, Mountain Iron ... · Lavas-North Shore Volcanic Group Granite-Quetico subprovince Hematite mines + new high bridge Augite troctolite-Duluth

INSTITUTE ON LAKE SUPERIOR GEOLOGY

www.lakesuperiorgeology.org

Minnesota Geological Survey (U of M)Mark Jirsa

Terry BoerboomAmy Radakovich

Natural Resources Research Institute (U of M)George Hudak

Dean PetersonMesabi Range Geological Society (MRGS)

Mark SeversonMehgan Blair

May 12-15,2020

Mountain Iron,Minnesota“Taconite Capital

of the World”

PLANNING COMMITTEE

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1865—Henry H. Eames (State Geologist-MN) canoed St Louis River and Embarrass Lakeand reported “immense bodies of the ores of iron;” (he was looking for gold)

1890—Merritt brothers discovered iron ore near MOUNTAIN IRON.

1892—First Mesabi Range iron ore shippedfrom MOUNTAIN IRON.

Courtesy of Iron Range Research Center

He then ascended the Prairie River, reporting similar finds.

In one year, he unknowingly defined the eastern and western ends of the Mesabi Iron Range.

WHY “TACONITE CAPITOL OF THE WORLD?”

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Virginia

Ely

MESABI

Cu-Ni DISTRICT

RANGE

Duluth

Grand Marais

Orr

Superior

IRON

Lake

International Falls

GrandRapids

TwoHarbors

MESOPROTEROZOIC

PALEOPROTEROZOIC

NEOARCHEAN

Duluth Complex, North Shore Volcanic Group

BEDROCK GEOLOGY

Schist and migmatite

Virginia, Thomson, Rove Formations

Biwabik, Gunflint Iron Formations

Granitoid rocks

Metavolcanic, volcaniclastic, and metasedimentary rocks

MOUNTAIN IRON

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Greenstone-Wawa + Wabigoonsubprovinces Schist + migmatite-Quetico subprovince

Graywacke-Jay Cooke State Park Lavas-North Shore Volcanic Group

Granite-Quetico subprovince

Augite troctolite-Duluth ComplexHematite mines + new high bridge

Taconite mines-Mesabi Iron Range

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INSTITUTE ON LAKE SUPERIOR GEOLOGY

www.lakesuperiorgeology.org

POTENTIAL FIELD TRIPS:1) Quetico subprovince travers2) Arrowhead—new road cuts, recent mapping results3) Mesabi Range—mines, quarries, reclamation, NRRI Coleraine Lab4) AngloGold Ashanti exploration—Wawa subprovince5) Duluth Complex—Polymet, Twin Metals6) Tamarack tour7) Dean Peterson’s “Profound Outcrops”8) Arrowhead—Quaternary highlights and relevance to prospecting

May 12-15,2020

Mountain Iron,Minnesota

“Taconite Capital of the World”

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Digital Elevation Model Central Mesabi Iron Range, DNR, (ca. 1999)

See you inMountain Iron

2020

Hwy 53

Hwy 169

Hwy 53

Hwy 169


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