Le Blondeau

Prospect, Active?

Commodities and mineralogy

Main commodities Ag; Au
Other commodities Co
Ore minerals pyrrhotite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale SK
Quadrangle map, 1:63,360-scale B-4
Latitude 59.26
Longitude -136.24
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is about 1/4 by 1/2 mile in area. Its approximate center is at an elevation of about 1,500 feet on a sharp ridge just west of the terminus of the Le Blondeau Glacier and south of the Tsirku River. It is on the the south-central edge of the section 13, T. 30 S., R. 54 E. of the Copper River Meridian. It is shown as location 26 on sheet 1 of Still and others (1991) and and locations F70 to F72 on sheet 1 of Gilbert and others (1991).

Geologic setting

Geologic description

According to Still and others (1991), this prospect consists of irregular quartz veins up to 0.8 feet wide and 50 feet long that are exposed near the face of the retreating Le Blondeau Glacier. The veins cut bedding and are hosted in dikes and metachert. Vein samples contain up to 1.561 ppm gold, 2.4 ppm silver, and 251 ppm cobalt . The veins are probably of Cretaceous age or younger based on the age of a nearby quartz diorite to granodiorite intrusion (MacKevett and others, 1974; Gilbert, 1988).
Still and others (1991) also note that 'The snout of this (Le Blondeau) glacier is the site of some limited placer activity, including the staking of placer claims' but there is no record of any significant production.
Geologic map unit (-136.241875150165, 59.2596416010151)
Mineral deposit model There is little information but Still and others (1991) refer to polymetallic veins in dikes and adjacent metacherts (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c
Age of mineralization The age is unknown but is probably Cretaceous or younger based on the age of a nearby intrusion (MacKevett and others, 1974; Gilbert, 1988).

Production and reserves

Indication of production None

References