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Brown and Metzdorf Mine, Kasaan Peninsula, Prince of Wales Island, Ketchikan Mining District, Prince of Wales-Hyder Census Area, Alaska, USAi
Regional Level Types
Brown and Metzdorf MineMine
Kasaan PeninsulaPeninsula
Prince of Wales IslandIsland
Ketchikan Mining DistrictMining District
Prince of Wales-Hyder Census AreaCensus Area
AlaskaState
USACountry

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Latitude & Longitude (WGS84):
55° 35' 17'' North , 132° 28' 50'' West
Latitude & Longitude (decimal):
Type:
KΓΆppen climate type:
Nearest Settlements:
PlacePopulationDistance
Hollis112 (2011)10.4km
Thorne Bay483 (2017)11.4km
Hydaburg391 (2017)47.6km
Coffman Cove180 (2017)52.1km
Mindat Locality ID:
196671
Long-form identifier:
mindat:1:2:196671:1
GUID (UUID V4):
e4244a66-1433-4698-a8fd-dd0dfde3014e


Location: The Brown and Metzdorf Mine is about 0.7 mile northwest of the Alarm Mine (CR055), which is shown on the USGS 1:63,360-scale topographic map. The Brown and Metzdorf Mine is about 0.3 mile southwest of the northeast corner of section 35, T. 72 S., R. 84 E. The location is accurate. The geology and workings in the area are shown on plates 24 and 25 of Warner and others (1961).
Geology: Most of the area in the vicinity of the Brown and Metzdorf mine is covered by vegetation and surficial deposits and the geology is not well known. The rocks north and west of the deposit are mainly greenstone, but marble and garnet-epidote tactite are exposed in several places. The greenstone and tactite are cut by several basalt and andesite dikes. The deposit consists of one or more small pods of high-grade ore comprising pyrite and chalcopyrite in tactite. Molybdenite is present in minor amounts. There is also a small amount of pyrite and chalcopyrite disseminated in the tactite and greenstone. The deposit was discovered prior to 1908 and Wright (1915) reported that it produced a small amount of ore. The workings consist of several open cuts and trenches, two shafts, and an adit with 225 feet of workings. The Brown and Metzdorf Mine is one of many copper-iron deposits on the Kasaan Peninsula having similar geology and origin (Warner and others, 1961; Eberlein and others, 1983; Brew, 1996). The rocks on the peninsula consist mainly of andesite ('greenstone' in much of the older literature) interbedded with about 25 percent sedimentary rocks comprising approximately equal amounts of limestone or marble, calcareous mudstone and sandstone, and graywacke and conglomerate. These units are part of the Luck Creek Breccia of Silurian and Devonian age, but many of the sedimentary units are similar to and probably grade into rocks of the Silurian and Ordovician, Descon Formation. The bedded rocks are intruded by a profusion of Silurian or Ordovician dikes, sills, and irregular masses of porphyritic gabbro, basalt, andesite, diorite, dacite, and granodiorite. Near some of the deposits, these intrusions may make up 20 percent or more of the outcrop and usually are associated with the development of tactite and alteration of the greenstone. The area subsequently was intruded by several large Silurian or Ordovician plutons; they are mainly granodiorite but locally are diorite and gabbro. The ore deposits are typically small and of irregular shape; often the ore bodies form lenses or mantos. Some of the deposits conform to the layering in the greenstone and sedimentary rocks. The principal ore minerals are chalcopyrite, pyrite, and magnetite; hematite is often present and a little molybdenite occurs in some deposits. Most of the deposits are associated with tactite or skarn with varying amounts of actinolite, calcite, chlorite, garnet, diopside, epidote, and hornblende. There was significant by-product silver and gold in the ore that was mined in the past, and the gold values in some deposits are high enough to have encouraged exploration in recent years. Marble is more common in the deposits in the western part of the peninsula, where the gold values are generally higher as well (Wright and Wright, 1908; Wright, 1915; Warner and others, 1961; Myers, 1985; Bond, 1993; Maas and others, 1995). Early interpretations of the ore deposits on the Kasaan Peninsula emphasize their contact metamorphic origin and their probable Mesozoic age (for example, Warner and others, 1961). However, recent radiometric dating and mapping indicate that the deposits formed in a Silurian or Ordovician, arc-related environment characterized by deposition of andesite and submarine sedimentary rocks that were intruded by swarms of dikes of varying composition, mineralized, and then intruded by large granodiorite plutons (Hedderly-Smith, 1999 [Inventory]). The copper deposits of the Kasaan Peninsula were known to the Russians and the first claim was staked in 1867. Most of the production and development occurred from about 1900 to 1918, especially from 1905 to 1907, when copper prices soared and a smelter was built at Hadley on the north side of the Kasaan Peninsula. After World War I, copper supply exceeded demand, prices fell, and there has been no further copper production since 1918 (Wright, 1915; Warner and others, 1961; Roppel, 1991; Maas and others, 1995). However, because of the intense and widespread mineralization on the peninsula, the area has repeatedly been re-examined for copper, iron, and gold, notably during WW II (Warner and others, 1961) and in the last several decades.
Workings: The workings consist of several open cuts and trenches, two shafts, and an adit with 225 feet of workings.
Age: The deposit formed in a Silurian or Ordovician, submarine arc-related environment characterized by the deposition of volcanic and sedimentary rocks, the intrusion of swarms of dikes of diverse composition, and the emplacement of several large plutons.
Alteration: Development of garnet-epidote skarn.
Production: The deposit was discovered prior to 1908 and Wright (1915) reported that it produced a small amount of ore.
Reserves: None.

Commodities (Major) - Cu, Fe, Mo
Development Status: Yes; small
Deposit Model: Cu-Fe skarn (Cox and Singer, 1986; model 18d).

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


6 valid minerals.

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
β“˜Chalcopyrite2.CB.10aCuFeS2
β“˜Molybdenite2.EA.30MoS2
β“˜Pyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
β“˜Magnetite4.BB.05Fe2+Fe3+2O4
Group 5 - Nitrates and Carbonates
β“˜Calcite5.AB.05CaCO3
Group 9 - Silicates
β“˜Epidote9.BG.05a(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Unclassified
β“˜'Garnet Group'-X3Z2(SiO4)3

List of minerals for each chemical element

HHydrogen
Hβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
CCarbon
Cβ“˜ CalciteCaCO3
OOxygen
Oβ“˜ CalciteCaCO3
Oβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Oβ“˜ MagnetiteFe2+Fe23+O4
Oβ“˜ Garnet GroupX3Z2(SiO4)3
AlAluminium
Alβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
SiSilicon
Siβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Siβ“˜ Garnet GroupX3Z2(SiO4)3
SSulfur
Sβ“˜ ChalcopyriteCuFeS2
Sβ“˜ MolybdeniteMoS2
Sβ“˜ PyriteFeS2
CaCalcium
Caβ“˜ CalciteCaCO3
Caβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
FeIron
Feβ“˜ ChalcopyriteCuFeS2
Feβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Feβ“˜ MagnetiteFe2+Fe23+O4
Feβ“˜ PyriteFeS2
CuCopper
Cuβ“˜ ChalcopyriteCuFeS2
MoMolybdenum
Moβ“˜ MolybdeniteMoS2

Other Databases

Link to USGS - Alaska:CR054

Other Regions, Features and Areas containing this locality


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References

 
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