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Ashland Co., Wisconsin, USA

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The North End of the Ashland Black Granite Quarry

Ashland Black Granite Quarry, Ashland Co., Wisconsin, USA
The West Side of the Ashland Black Granite Quarry

Ashland Black Granite Quarry, Ashland Co., Wisconsin, USA
Location is approximate, based on center of defined region.
Latitude & Longitude (WGS84): 46° 17' 30'' North , 90° 49' 59'' West (est.)
Neighbouring regions:

Ashland County’s bedrock is dominated by a 35 km. thick sequence of Precambrian rocks tilted steeply by thrusting along the Marenisco Fault. These Precambrian rocks occur in NE striking belts, with the oldest at the southern edge of the county. The oldest rocks in the section are poorly exposed Archean meta-volcanic and meta-sedimentary rocks. These are overlain by a thick section of Proterozoic sedimentary rocks, including the Ironwood Iron Formation, which was the main formation extensively mined in the Gogebic Iron Range. These are overlain by a thick section of 1.1 billion year old (Keweenawan) volcanic rocks (Powder Mill Group and Portage Lake Lava Series) from the Mid-Continent Rift. These are intruded by the complexly differentiated Keweenawan–age plutons of the Mellen Complex. On top of these is a package of Proterozoic sedimentary rocks (Oronto Group) which further filled the rift after the cessation of volcanism. The youngest bedrock, separated from the older rocks by another large thrust fault, the Douglas Fault, is the little metamorphosed Proterozoic Bayfield Group sandstones.

The Keweenawan volcanic rocks are well exposed along the gorge in Copper Falls State Park. The Mellen igneous complex is seen in quarries and outcrops around Mellen, Wisconsin. The dark-colored anorthosites and gabbros of the pluton are quarried and marketed as “black granite”. The plutons also contain red granites that are quarried near Highbridge. The Ironwood Iron Formation and associated sediments are exposed on the ridges along Mt. Wittlesey. Recently (2013) a mining company is proposing to open a large open-pit iron mine in the Mellen area, exploiting these rocks.

Glacial drift and glacial lake sediments cover a lot of the county. The coarse tills and outwash can yield interesting minerals such as “drift” copper and Lake Superior agates.

Commodity List

This is a list of exploitable or exploited mineral commodities recorded from this region.

Mineral List

Mineral list contains entries from the region specified including sub-localities

41 valid minerals.

Rock Types Recorded

Note: this is a very new system on and data is currently VERY limited. Please bear with us while we work towards adding this information!

Rock list contains entries from the region specified including sub-localities

Select Rock List Type

Alphabetical List Tree Diagram

Localities in this Region

This page contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


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Laybourn, D.P., 1979, Geology and Metamorphism of the Ironwood Iron Formation, Gogebic Range, Wi., Unpub. M.S. Thesis, U of M - Duluth, 223 p.
Cannon, W.F., L.G. Woodruff, S.W. Nicholson & C.A. Hedgman (1996) Bedrock geologic map of the Ashland and the northern part of the Ironwood 30' x 60' Quadrangles, Wisconsin and Michigan: U.S. Geological Survey, Miscellaneous Investigations Series: Map I-2566, 1 sheet.
Cannon, W. , G. LaBerge, J. Klasner & K. Schulz (2007) The Gogebic Iron Range - a sample of the northern margin of the Penokean fold and thrust belt: U. S. Geological Survey Professional Paper 1730, 44 p. plus map.

External Links

Wisconsin Mineral index - Wisconsin Geological and Natural History Survey

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