Bach; Beach Group Prospect, Juneau Mining District, Juneau, Alaska, USA i
Regional Level Types
Bach; Beach Group Prospect Prospect
Juneau Mining District Mining District
Juneau City Borough
Alaska State
USA Country

Location: This prospect is at an elevation of 3,000 feet near the southeast end of a ridge west of outer Speel Arm. It is about 0.5 mile north of the center of section 3, T. 44 S., R. 71 E. of the Copper River Meridian. The location is accurate within 1/2 mile.
Geology: The Bach or Beach Group prospect is in the Coast Range plutonic-metamorphic complex which consists of high-grade schist and gneiss intruded by Cretaceous and Tertiary granodiorite (Brew and Ford, 1984). Brew and Ford (1985) describe the rocks at this prospect as mainly by tonalite, quartz diorite, and minor granodiorite. The deposit consists of a quartz vein that contains an auriferous sulfide (arsenopyrite?), in diorite (Wright and Wright, 1906). This prospect was active prior to 1905 but reconnaissance work by the U.S. Bureau of Mines in the 1980's failed to locate it (Redman and others, 1985).

Commodities (Major) - Au
Development Status: Undetermined
Deposit Model: Possibly low-sulfide Au-quartz veins (Cox and Singer, 1986; model 36a)

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.

ⓘ Gold

Mineral List

ⓘ Arsenopyrite ?

ⓘ Quartz

2 valid minerals.

Detailed Mineral List:

ⓘ Arsenopyrite ?

Formula: FeAsS

References:

(2008) Alaska Resource Data File (ARDF) Open-File Report 2008-1225. US Geological Survey

ⓘ Quartz

Formula: SiO₂

References:

(2008) Alaska Resource Data File (ARDF) Open-File Report 2008-1225. US Geological Survey

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘ	Arsenopyrite ?	2.EB.20	FeAsS
Group 4 - Oxides and Hydroxides
ⓘ	Quartz	4.DA.05	SiO₂

List of minerals for each chemical element

O	Oxygen
O	ⓘ Quartz	SiO₂
Si	Silicon
Si	ⓘ Quartz	SiO₂
S	Sulfur
S	ⓘ Arsenopyrite	FeAsS
Fe	Iron
Fe	ⓘ Arsenopyrite	FeAsS
As	Arsenic
As	ⓘ Arsenopyrite	FeAsS

Other Databases

Link to USGS - Alaska:	TR013

Other Regions, Features and Areas containing this locality

North AmericaContinent

Coast MountainsMountain Range

North America PlateTectonic Plate

Coast plutonic complexVolcanic Arc
Taku DomainDomain

This page contains all mineral locality references listed on mindat.org. 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 mindat.org 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.

References

Brew, D.A., and Ford, A.B., 1984, The northern Coast plutonic-metamorphic complex, southeastern Alaska and northwestern British Columbia, in Coonrad, W.C., and Elliott, R.L., eds., The United States Geological Survey in Alaska--Accomplishments during 1981: U.S. Geological Survey Circular 868, p. 120-124. Brew, D.A., and Ford, A.B., 1985, Preliminary reconnaissance geologic map of the Juneau, Taku River, Atlin, and part of the Skagway 1:250,000 quadrangles, southeastern Alaska: U.S. Geological Survey Open-File Report 85-395, 23 p., 2 sheets, scale 1:250,000. Redman, E.C., Roberts, W. S., Clough, A., and Kurtak, J., 1985, Preliminary mine, prospect, sample location maps and descriptions, Juneau Gold Belt area: U.S. Bureau of Mines Open-File Report 85-86, 68 p. 4 sheets. Wright, F.E., and Wright, C.W., 1906, Lode mining in southeastern Alaska: U.S. Geological Survey Bulletin 284, p. 30-54.

Quick NavTop Commodities Mineral List Other Databases Other Regions References

Mindat.org® is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Mindat® and mindat.org® are registered trademarks of the Hudson Institute of Mineralogy.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2026, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph and Ida Chau.
Content on this site may not be used to train, fine-tune, or otherwise develop artificial intelligence or machine learning models without prior written permission - see our Terms & Conditions.
To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844. doi:10.2138/am-2024-9486.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: October 21, 2026 06:46:12 Page updated: July 30, 2025 08:36:29

Go to top of page