Unnamed (near Mallard Bay)

Occurrence, Probably inactive

Commodities and mineralogy

Main commodities Au; Ce; Cu; La; U
Other commodities Y; Zn
Ore minerals chalcopyrite; monazite; ree minerals
Gangue minerals chlorite; clay minerals; hematite; quartz

Geographic location

Quadrangle map, 1:250,000-scale DE
Quadrangle map, 1:63,360-scale D-1
Latitude 54.7713
Longitude -132.0094
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is about 0.3 mile north of the northwest head of Stone Rock Bay, in the NW1/4 SW1/4 section 8, T. 82 S., R. 90 E.

Geologic setting

Geologic description

The only work at this prospect is a few small pits on several claims. A network of quartz-hematite veins occurs in radioactive, altered andesite(?) dikes that cut Silurian or Ordovician syenite (MacKevett, 1963; Gehrels, 1992). The dikes are largely altered to chlorite and clay minerals and are cut by late-stage calcite veinlets that lack any radioactive minerals. Maas and others (1991) speculatively identified monazite in the quartz-hematite veinlets. They collected several samples of the dikes and syenite that contained up to 132 parts per billion gold, 0.27 percent copper, 331 parts per million (ppm) zinc, 1,080 ppm uranium, 1.44 percent cerium, 0.723 percent lanthanum, and 54 ppm yttrium. A sample nearby of silicified syenite with disseminated chalcopyrite contained 229 to 402 ppb gold and 3,162 to 6,206 ppm copper.
Geologic map unit (-132.011073300095, 54.7709579894708)
Mineral deposit model U-REE-bearing dikes.
Alteration of deposit The radioactive dikes are almost completely altered to chlorite and clay minerals. Syenite nearby is silicified.

Production and reserves

Workings or exploration Only a few small prospecting pits.
Indication of production None