Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Pb; Zn
Other commodities As; Au; Cu; Sn
Ore minerals chalcopyrite; galena; pyrite; sphalerite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale KL
Quadrangle map, 1:63,360-scale A-4
Latitude 68.1989
Longitude -154.9866
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Kady deposit is about 1.6 miles northwest of the end of Kakivilik Creek near the center of section 4, T. 32., R. 17 E. Kurtak and others (1995) have several maps of the occurrence.

Geologic setting

Geologic description

The Kady deposit was found by the U.S. Geological Survey in about 1986 as a result of stream-sediment sampling (Duttweiler,1987). It was subsequently mapped and sampled by the U.S. Bureau of Mines (Kurtak and others, 1995).
The rocks at this occurrence are sandstone and minor conglomerate of the Shainin Lake Member of the Upper Devonian to Lower Mississippian Kanayut Conglomerate, that are thrust over the Ear Peak Member of the Kanayut (Kurtak and others, 1995). The rocks are intensely deformed into a series of generally east-trending folds. The fold axes trend N65E and plunge south.
The mineralization consists of a series of swarms of quartz veins and quartz-cemented breccia zones that crosscut the bedding and fold axes (Kurtak and others, 1995). There are two distinct types of veins: 1) barren quartz veins, and 2) sulfide-quartz veins with major sphalerite and galena, and lesser chalcopyrite and pyrite. The two types are spatially separated. The best concentration of sulfide veins and breccia is about 800 feet long and up to 150 feet wide, and trends north-northwest. It is bordered on the east by a zone up to 500 feet wide of barren quartz veins. Individual veins vary from a few centimeters to 30 meters wide and can be traced for up to 229 meters along strike. Most of the sulfide-bearing veins strike N40E and dip vertically. Another set which contains higher metal values strikes N40W and dips steeply south. At least 9 separate veins or mineralized zones have been identified in an area about 5,000 feet by 3,000 feet in size. Some notable sample included: 1) samples of galena from a breccia contained up to 59.8 percent lead, 0.7 percent zinc, and 745 grams of silver per tonne; 2) a chip sample across a 3-meter-wide vein contained 10 percent zinc, 0.10 percent lead, 10.8 grams of silver per tonne, and 53 parts per billion gold; 3) a continuous chip sample across a 1.7-meter-wide quartz vein contained 1.06 percent zinc, and 3.4 grams of silver per tonne; and 4) a grab sample across 6 meters of rubblecrop contained 14,560 parts per million copper, 0.24 percent lead, 2.3 percent zinc, and 5.8 grams of silver per tonne. Tin and arsenic are also reported.
Geologic map unit (-154.989475432058, 68.1984209253082)
Mineral deposit model Silver-lead-zinc-quartz veins and vein-breccias.
Age of mineralization Late Devonian or younger based on the age of the host rock. Possibly Late Jurassic to Cretaceous by analogy with other deposits in the western Brooks Range.
Alteration of deposit Not specifically noted but associated with the introduction of much quartz in the veins and breccia.

Production and reserves

Workings or exploration Only sampling and mapping by the U.S. Geological Survey and U.S. Bureau of Mines.
Indication of production None
Reserve estimates None.
Production notes None.

Additional comments

The occurrence is in the Gates of the Arctic National Park which is closed to prospecting and mining.
MAS No. 002010001