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Sillimanite from
Helen Beryl Mine (Sweepstakes Beryl; Big Tom claim; Kem claim), Fourmile, Custer District, Custer Co., South Dakota, USA

Description
Quality of samples:not specified / average specimens
Confirmation
Validity:Believed Valid
References
References:Staatz, M. H.; Page, L. R.; Norton, J. J.; Wilmarth, V. R. (1963) Exploration for beryllium at the Helen Beryl, Elkhorn, and Tin Mountain pegmatites, Custer County, South Dakota. USGS Prof. Paper 297C.
Data
Mineral Data:Click here to view Sillimanite data
Locality Data:Click here to view Helen Beryl Mine (Sweepstakes Beryl; Big Tom claim; Kem claim), Fourmile, Custer District, Custer Co., South Dakota, USA
Nearest other occurrences of Sillimanite
3.1km (1.9 miles) Red Spar Mine, Unorganized District, Custer Co., South Dakota, USA
6.6km (4.1 miles) Silver Dollar Mine, Custer District, Custer Co., South Dakota, USA
6.9km (4.3 miles) Buster lode (Buster Dike Mica Mine), Custer, Custer District, Custer Co., South Dakota, USA
7.4km (4.6 miles) Ruby Reef Claims (Ruby Reef; Ruby Reef No. 1), Custer District, Custer Co., South Dakota, USA
12.9km (8.0 miles) Victory Mine (Victory pegmatite; Victory Mica Mine; Hedman Mine), Custer, Custer District, Custer Co., South Dakota, USA
14.8km (9.2 miles) Mica King Mine (Lost Bonanza; Cook Mine), Custer District, Custer Co., South Dakota, USA
14.9km (9.3 miles) Hot Shot mine, Custer, Custer District, Custer Co., South Dakota, USA
15.0km (9.3 miles) Elkhorn Mine (Tinsley Mine), Custer, Custer District, Custer Co., South Dakota, USA
16.0km (9.9 miles) Beecher No. 3, Beecher Lode, Custer, Custer District, Custer Co., South Dakota, USA
16.0km (9.9 miles) Hofert Arcade (Victory No. 1 Prospect), Custer District, Custer Co., South Dakota, USA
16.4km (10.2 miles) Southern Black Hills Kyanite Mine, Southern Black Hills, Custer Co., South Dakota, USA
16.4km (10.2 miles) Lucky Strike (Woods Mine), Pringle, Custer District, Custer Co., South Dakota, USA
18.4km (11.4 miles) Eureka Lode Prospect (Hultz), Custer Co., South Dakota, USA
21.4km (13.3 miles) U.S. highways 16/385 & State route 87 intersection area, Oreville District, Pennington Co., South Dakota, USA
28.0km (17.4 miles) Hugo Mine, Keystone, Keystone District, Pennington Co., South Dakota, USA
241.4km (150.0 miles) Laramie Range Kyanite Occurrence, Laramie Range District, Albany Co., Wyoming, USA
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