| Main commodities | Ag; Pb; Zn |
|---|---|
| Ore minerals | galena; pyrite; pyrrhotite; sphalerite |
| Gangue minerals | quartz |
| Quadrangle map, 1:250,000-scale | CR |
|---|---|
| Quadrangle map, 1:63,360-scale | B-3 |
| Latitude | 55.49057 |
| Longitude | -132.98194 |
| Nearby scientific data | Find additional scientific data near this location |
| Location and accuracy | The descriptions that have been published do not provide exact locations of the several mineralized samples that define this site, but they are generally in the S1/2 section 32, T. 73 S., R. 82 E., and the N1/2 section 5, T. 74 S., R. 82 E. The coordinates are at about the center of the mineralized area. |
Geologic descriptionHedderly-Smith (1999 [Inventory]) identified several mineral occurrences in this area by following up geochemical anomalies. The country rocks are mostly metamorphosed Silurian or Ordovician andesite of the Luck Creek Breccia or Descon Formation, and the deposits probably are at or near the periphery of a small syenite stock. A rock-chip sample from a borrow pit in the southeast corner of section 32 contained 216 parts per million (ppm) lead and 2,100 ppm zinc; further examination revealed pyrite-sphalerite veinlets in silicified rhyodacite(?). In the northwest corner of section 5, brecciated rhyodacite(?) with a matrix composed of quartz with minor pyrite, pyrrhotite, sphalerite, and galena, forms a zone 20-60 feet wide; a sample contained 232 ppm lead, more than 2 percent zinc, and 2.3 ppm silver. | |
| Geologic map unit | (-132.98360411044, 55.4902233726642) |
|---|---|
| Mineral deposit model | Base and precious-metal values in quartz veinlets and breccia. |
| Age of mineralization | The deposits may be related to a small syenite stock of uncertain age. |
| Alteration of deposit | Silicification of volcanic rocks. |
| Workings or exploration | Only sampling by industry geologists. |
|---|---|
| Indication of production | None |
Additional commentsThe Sealaska Corporation has the subsurface rights to the land in the vicinity of these occurrences. | |
ReferencesHedderly-Smith, D.A., 1989, Report of the 1988 field season - Sealaska Mineral Reconnaissance Project: Sealaska Corporation, 66 p. (Unpublished report held by the Sealaska Corporation, Juneau, Alaska.)
Hedderly-Smith, D.A., 1992, Report of the 1991 field season - Sealaska Mineral Reconnaissance Project: Sealaska Corporation, 2 vols., 225 p. 23 plates. (Unpublished report held by the Sealaska Corporation, Juneau, Alaska.)
Hedderly-Smith, D.A., 1993, Report of the 1992 field season-Sealaska minerals reconnaissance project: Sealaska Corporation, 60 p. (Unpublished report held by the Sealaska Corporation, Juneau, Alaska.)
Hedderly-Smith, D.A., 1999, Inventory of metallic mineral prospects, showings and anomalies on Sealaska lands, 1988 through 1998: Sealaska Corporation, Juneau, Alaska, 217 p. (internal report held by Sealaska Corporation, Juneau, Alaska).
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| Reporters | D.J. Grybeck (Applied Geology) |
|---|---|
| Last report date | 5/1/2004 |