Unnamed Occurrence (ARDF - BC093; east of Upper Marten Lake), Petersburg Mining District, Wrangell City and Bourough, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - BC093; east of Upper Marten Lake)	- not defined -
Petersburg Mining District	Mining District
Wrangell City and Bourough	Borough
Alaska	State
USA	Country

Location: This occurrence is in a saddle at an elevation of 2,600 feet; it is about 1.1 mile east-southeast of the southeast end of Upper Marten Lake near the center of section 26, T. 64 S., R. 86 E. The location is accurate.
Geology: This occurrence was first described by Still and others (2002) in an area with little previous indication of mineralization. It is along a fault zone that strikes 330 degrees and dips 75 degrees to the northeast. The fault cuts Mesozoic and/or Paleozoic schist and paragneiss near the contact with Cretaceous diorite (Elliot and Koch, 1981). The occurrence is about 2 miles west of the Coast Range megalineament (Brew and Ford, 1978), and the 'Great Tonalite Sill' (Brew and Morrell, 1983). Quartz stringers and clay gouge are common in the fault zone. Some of the quartz stringers contain pyrite, pyrrhotite, and other sulfides. Four samples of iron-stained quartz were collected along the fault; one contained 475 parts per billion gold, 86.9 part per million (ppm) silver, and 1,218 ppm lead. Another quartz vein about 0.2 to 1 foot thick about 2 miles north of the main occurrence contains only minor pyrite and assayed 517 ppb gold.
Workings: Only a few samples collected by Still and others (2002) during a regional mineral assessment by the Bureau of Land Management.
Alteration: No information other than along a fault zone with clay gouge.
Reserves: None.

Commodities (Major) - Ag, Au, Pb
Development Status: None
Deposit Model: Gold-quartz veinlets along a regional fault.

Other Databases

Link to USGS - Alaska:	BC093

Other Regions, Features and Areas containing this locality

References