Delaware Fissure Mine, Delaware, Grant Township, Keweenaw County, Michigan, USAi
| Regional Level Types | |
|---|---|
| Delaware Fissure Mine | Mine |
| Delaware | Unincorporated Community |
| Grant Township | Township |
| Keweenaw County | County |
| Michigan | State |
| USA | Country |
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Latitude & Longitude (WGS84):
47° 25' 23'' North , 88° 6' 10'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Copper Harbor | 108 (2017) | 16.9km |
| Ahmeek | 146 (2017) | 26.1km |
| Copper City | 187 (2017) | 26.5km |
| Laurium | 1,941 (2017) | 32.9km |
| Calumet | 703 (2017) | 33.0km |
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
Local clubs are the best way to get access to collecting localities
| Club | Location | Distance |
|---|---|---|
| Copper Country Rock and Mineral Club | Dollar Bay, Michigan | 46km |
This description is for the fissure operations at Delaware.
An underground copper mine consisting of three shafts located near the ghost town of Delaware. The Delaware Fissure Mine was worked by the Delaware Mining Company (an offshoot of the Pennsylvania Mining Company) between 1864 and 1880. The mine worked the Delaware Fissure, which consisted of one vein that showed copper mixed in a coarse calcite and fine prehnite matrix. In 1876, the two companies merged to form one company, the Delaware Copper Mining Company. Work continued until 1881 when the Conglomerate Mining Company was organized and absorbed the Delaware. In 16 years, the mine produced very minor amounts of copper, which is noticed today as very little copper is found in the pile. Today, the mine is more known for the spectacular datolite nodules it produces. All colours can be found here, with pinks and reds being the most abundant. The pile also produces some greenstone, adularia, and silver/copper in prehnite vugs.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
3 valid minerals.
Detailed Mineral List:
| ⓘ Calcite Formula: CaCO3 References: |
| ⓘ Datolite Formula: CaB(SiO4)(OH) References: |
| ⓘ Native Copper Formula: Cu References: |
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Copper | 1.AA.05 | Cu |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Calcite | 5.AB.05 | CaCO3 |
| Group 9 - Silicates | |||
| ⓘ | Datolite | 9.AJ.20 | CaB(SiO4)(OH) |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Datolite | CaB(SiO4)(OH) |
| B | Boron | |
| B | ⓘ Datolite | CaB(SiO4)(OH) |
| C | Carbon | |
| C | ⓘ Calcite | CaCO3 |
| O | Oxygen | |
| O | ⓘ Calcite | CaCO3 |
| O | ⓘ Datolite | CaB(SiO4)(OH) |
| Si | Silicon | |
| Si | ⓘ Datolite | CaB(SiO4)(OH) |
| Ca | Calcium | |
| Ca | ⓘ Calcite | CaCO3 |
| Ca | ⓘ Datolite | CaB(SiO4)(OH) |
| Cu | Copper | |
| Cu | ⓘ Native Copper | Cu |
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Mid-continent DomainDomain
- Mid-continent RiftNarrow Rift
USA
- Michigan
- Keweenaw PeninsulaPeninsula
- Midcontinent RiftGeologic Province
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Delaware Fissure Mine, Delaware, Grant Township, Keweenaw County, Michigan, USA