Waterfall Creek

Prospect, Active

Commodities and mineralogy

Main commodities Zn
Other commodities Mo; Pb
Ore minerals pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale CY
Quadrangle map, 1:63,360-scale B-1
Latitude 65.38
Longitude -141.05
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Waterfall Creek prospect area encompasses about 20 square miles; the approximate center of the area is in section 29, T. 6 N., R. 32 E., of the Fairbanks Meridian. The coordinates are for the most mineralized portion of the prospect area, which trends north-northeast through the center of section 1, T. 6 N., R. 32 E., of the Fairbanks Meridian. This location is accurate to within one mile. This prospect is located within Doyon, Limited selected or conveyed land.

Geologic setting

Geologic description

The Waterfall Creek prospect is underlain by northwest-dipping, Upper Proterozoic to Lower Cambrian Tindir Group rocks (redbeds, basalt, limestone, and conglomerate), which transition northwestward into black chert, green siltstone, and quartzite (DiMarchi and others, 1993). The Waterfall Creek thrust separates the Tindir Group from a Cambrian through Permian sedimentary sequence which lies to the west. Bedding in this area generally strikes north-northeast and dips from 80SE to 55NW (DiMarchi and others, 1993).
Minor fine-grained disseminated pyrite is present in altered basalt and siltstone units. Alteration consists mostly of chloritization of basalt and oxidation of cherts and siltstones. Iron oxides are found locally, most of them in clasts of breccia which is hosted by silicified limestone or quartzite. White quartz veins and drusy quartz veinlets and vuggy fillings are also common in brecciated rocks (DiMarchi and others, 1993).
Soil and stream sediment samples taken by WGM Inc. and by ASA Inc. are anomalous in zinc in the prospect area. Weak anomalies of molybdenum and lead were also found (DiMarchi and others, 1993).
Geologic map unit (-141.052393682477, 65.37974972676)
Mineral deposit model Fault-controlled Zn?
Age of mineralization Permian or younger.
Alteration of deposit Alteration at the Waterfall Creek prospect consists of chloritization of the basalt, iron oxide in breccia clasts in silicified limestone or quartzite, and quartz veins and vug fillings (DiMarchi and others, 1993).

Production and reserves

Workings or exploration WGM Inc. conducted a soil and rock sampling program on the property in the mid-1970s, and in 1993 ASA Inc. conducted a soil and rock sampling program and geologic mapping. The property is located on Doyon, Limited selected or conveyed land.
Indication of production None

Additional comments

This prospect is located on Doyon, Limited selected or conveyed land. For more information, contact Doyon, Limited. This site is within the Yukon-Charley Rivers National Preserve.

References

MRDS Number 10307414

References

DiMarchi, J.J., Weglarz, T.B., Adams, D.D., Hubert, J.A., and West, A.W., 1993, 1993 annual report--Reconnaissance program, Doyon option lands: ASA Inc., 120 p. (Report held by Doyon, Limited, Fairbanks, Alaska.)
Reporters C.E. Cameron (ADGGS)
Last report date 4/7/2000