Croft mine, Cuyuna North Range, Crow Wing County, Minnesota, USAi
| Regional Level Types | |
|---|---|
| Croft mine | Mine (Tourist Attraction) |
| Cuyuna North Range | Mountain Range |
| Crow Wing County | County |
| Minnesota | State |
| USA | Country |
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Latitude & Longitude (WGS84):
46° 29' 30'' North , 93° 57' 6'' West
Latitude & Longitude (decimal):
Type:
Mine (Tourist Attraction) - last checked 2023
Deposit first discovered:
1907
KΓΆppen climate type:
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 |
|---|---|---|
| Cuyuna Rock, Gem and Mineral Society | Brainerd, Minnesota | 24km |
Mindat Locality ID:
52895
Long-form identifier:
mindat:1:2:52895:2
GUID (UUID V4):
ea32b090-7dcc-4763-8e9a-80f3d8e8bd6b
The Croft Mine (SW Sec 1 T46N R29W) is the only Cuyuna Range underground mine where the surface facilities are still, at least periodically, accessible. The mine site was designated an historic site by the State of Minnesota in 1978. The shaft house and dry house were restored and the site opened as a park in 1978. Further restoration added more facilities and provided a museum and a simulated shaft descent and tour. More recently funding issues have caused the site to be closed and fenced off by the Minnesota DNR, accessible only under restricted conditions. The Croft Mine whose development was begun in 1907 by the John E. Savage and Sons Company. The initial shaft was a concrete-lined opening down to 100 feet where it struck bedrock. A steel shaft descended another 140 feet to intersect the main ore bodies. The mine was worked between 1914 and 1933, producing over 1.7 million tons of manganiferous iron ore. All of the workings were ubdergorund. The ore was in two bends of steeply dipping slatey iron formation of the Proterozoic Trommald Formation, separated by a band of chlorite schist. The iron formation showed extensive secondary enrichment. Drill core showed enrichment extended to a depths of over 800 feet, with samples assaying 40 - 50% iron.
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
2 valid minerals.
Rock Types Recorded
Note: data is currently VERY limited. Please bear with us while we work towards adding this information!
Select Rock List Type
Alphabetical List Tree DiagramDetailed Mineral List:
| β 'Chlorite Group' |
| β Hematite Formula: Fe2O3 |
| β Magnetite Formula: Fe2+Fe3+2O4 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| β | Magnetite | 4.BB.05 | Fe2+Fe3+2O4 |
| β | Hematite | 4.CB.05 | Fe2O3 |
| Unclassified | |||
| β | 'Chlorite Group' | - | |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | β Hematite | Fe2O3 |
| O | β Magnetite | Fe2+Fe23+O4 |
| Fe | Iron | |
| Fe | β Hematite | Fe2O3 |
| Fe | β Magnetite | Fe2+Fe23+O4 |
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Superior DomainDomain
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References
