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Hilton Mine (Ohio Mine), Greenland, Greenland Township, Keweenaw Copper Mining District, Ontonagon Co., Michigan, USAi
Regional Level Types
Hilton Mine (Ohio Mine)Mine
Greenland- not defined -
Greenland TownshipTownship
Keweenaw Copper Mining DistrictMining District
Ontonagon Co.County

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Latitude & Longitude (WGS84):
46° 46' 25'' North , 89° 3' 56'' West
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
Ontonagon1,324 (2017)21.8km
South Range746 (2017)46.0km

A former lode Cu mine located in sec. 36, T51N, R38W, MM, 2.8 km (1.8 miles) ESE of Greenland and 1.9 km (1.2 miles) NE of Mass City. MRDS database accuracy for this location is not stated.

The Ohio Mining Company was organized in 1850 on two small veins of copper. In 1854, a shaft was sunk and some mass copper was recovered. The mine was never a major producer as it was only worked by man power and horse whims and had no water for stamping. An additional shaft was sunk 100 feet deep and an adit connected the two shafts. After 1854, most work at the mine was conducted on tribute until it was abandoned in 1856. The Hilton Mining Company was organized in 1863 to continue work on the Ohio property. During this time, exploration shafts were sunk on a vein of epidote and quartz that contained copper. Several buildings were erected on the property during this time as well. After 1865, the mine was worked by tributers until it was abandoned in 1891. Between 1850 and 1890, the mine produced 123,724 pounds of copper. Copper, epidote, and quartz can be found on the rock piles today.

Mineralization is a Syenian aged (1,060,000) Cu deposit (Mark3 model number: 99 (Deposit Model: 96: Native Cu)), hosted in rocks of the Stenian Portage Lake Volcanics (basalt). The ore body is the Mass Lode, irregular in form. Alternate brecciated basalt flows, amygdaloidal basalts and/or interflow conglomerates, which vary with location. Local rocks include the Portage Lake Volcanics.

Regional geologic structures include: a syncline.

Same lode as mined by the Aztec and Great Western and Bohemian group of mines to the E; on the same bluffs as the Aztec and South Lake Mines.

Workings include surface and underground openings comprised of a shaft, pit, quarry, and a trench. There are 2 shafts with piles below, a 20 foot pit on top of the bluff, and an adit and shaft at the end of the bluff.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

2 valid minerals.

Detailed Mineral List:

Formula: Cu
Reference: Lee A. Miller (1986) Index & Reference Guide for the Copper Mining Industry of Michigan Vol III Ontonagon County.
Formula: CaB(SiO4)(OH)
Reference: Mineralogy of Michigan (2004) Heinrich & Robinson

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Group 9 - Silicates

List of minerals arranged by Dana 8th Edition classification

Metals, other than the Platinum Group
Group 54 - NESOSILICATES Borosilicates and Some Beryllosilicates
Borosilicates and Some Beryllosilicates with B in [4] coordination

List of minerals for each chemical element

H DatoliteCaB(SiO4)(OH)
B DatoliteCaB(SiO4)(OH)
O DatoliteCaB(SiO4)(OH)
Si DatoliteCaB(SiO4)(OH)
Ca DatoliteCaB(SiO4)(OH)
Cu CopperCu


Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Butler, B.S., and Burbank, W.S. (1929), The Copper Deposits of Michigan. U.S. Geological Survey, Professional Paper 144, 238 pp.
Johnson, A.M. and Groth, E.H. (1998), Inventory of Underground Mines, Ontonagon County, Michigan Department of Natural Resources, Site ID No. 660040: 90-91.
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10310133.
DeGood, L. (2011), Michigan Copper Mining Stocks and Bonds. 401 pp.
Hamka, T. (2011), The Copper Mines of Ontonagon County, Michigan. Copperlady Press. 154 pp.

USGS MRDS Record:10310133

Other Regions, Features and Areas containg this locality

North America PlateTectonic Plate

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