Rambler; Challenger Prospect, Hoonah-Angoon Census Area, Alaska, USAi

Regional Level Types
Rambler; Challenger Prospect	Prospect
Hoonah-Angoon Census Area	Census Area
Alaska	State
USA	Country

The area is often snow covered. It has potential for further discovery. The Rambler vein area is in Glacier Bay National Park and Preserve.
Location: The Rambler is about 1.25 miles south of Mt. Parker on the east side of Lamplugh Glacier at an elevation of about 1500 feet. The location is accurate within 100 feet. (The Mt. Parker of Rossman, 1959, B 1058-B, pl. 4, is about 1.6 miles north of the Mt. Parker of the Mount Fairweather D-3 quadrangle used to describe this location). The occurrence is location number 23 of Cobb (1972).
Geology: The Rambler vein area crops out on the east side of Lamplugh Glacier in an area underlain principally by granodiorite of Cretaceous age that encloses subordinate inclusions of metasedimentary rock. The granodiorite is cut by mafic dikes of northeast strike (MacKevett and others, 1971, p. 64). A major fault of north-northwest strike underlies and determines the linear course of Lamplugh Glacier (Brew and others, 1978); motion on that fault could have been important in opening the Rambler and nearby veins of northeast to east strike. As mapped by Rossman (1959, B 1058-B, pl. 4), the Rambler is in a vein swarm. The Rambler vein, of nearly east strike, is as much as 3-feet thick; most other veins strike about N. 60 E., pinch and swell characteristically and are traceable for 200-feet or less. The Rambler vein is pyritic; other veins, exposed or as float, contain arsenopyrite, galena, sphalerite, and sparse free gold. Of seven samples collected in the area and reported in MacKevett and others (1971, table 11), all except one contained at least 0.015 oz/ton gold. Maximum assay was 0.263 ounce per ton gold. Sampling by the Bureau of Mines (Kimball and others, 1978, p. C231) of short narrow high grade vein segments near Rambler contained as much as 6.45 ounce per ton gold in a narrow (about 0.35 foot) vein segment. Quartz, calcite, barite and feldspars are reported as vein minerals (MacKevett and others, 1971, p. 64).
Workings: The initial discovery was made by Joe Ibach before 1940. Four claims were located in 1936.
Age: Late Cretaceous or younger.
Alteration: Narrow alteration envelopes reported by MacKevitt and others (1971).
Reserves: No reserves; several veins in swarm may have potential.

Commodities (Major) - Au; (Minor) - Ag, Pb, Zn
Development Status: No
Deposit Model: Low-sulfide gold-quartz vein (Cox and Singer, 1986; model 36a).

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Link to USGS - Alaska:	MF029

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References