The Wieler mine is near the head of an unnamed, south-flowing tributary to Eureka Creek. It is at an elevation of about 3210 feet, about 0.3 mile south of the center of section 4, T. 16 S., R. 17 W., Fairbanks Meridian. Mineralization extends at least from 3160 to 3260 feet elevation in the mine area. The location is accurate within 300 feet.

The Wieler mine is in a 6000-foot-long fault block along the Kantishna antiform (see DN091). The country rocks are mainly interlayered marble and locally graphitic chlorite phyllite of the Spruce Creek sequence (Bundtzen, 1981; Thornsberry, McKee, and Salisbury, 1984, fig. K-2; v. 2, occurrence 85).

The principal deposit at the Wieler mine is an up to 4-foot-thick limonitic quartz vein that strikes N 40 E and dips about 37 NW, approximately parallel to the lithologic layering and schistosity of the Spruce Creek country rocks. Lenticular, sulfide-rich masses in the vein contain abundant galena, sphalerite, polybasite, and tetrahedrite. Where initially exposed, the vein was heavily coated with azurite and malachite. The sulfide-rich part of the vein was only about 35 feet long, but it was exceptionally rich. Channel samples cut at 10-foot intervals along the vein, which ranged from 1.9 to 3 feet thick, assayed as much as 182.3 ounces of silver per ton (Seraphim, 1962, p. 11). One grab sample assayed 902.1 ounces of silver per ton, 0.73 ounce of gold per ton, and 4.1 percent copper. Morrison (1964, p. 100) also reported bonanza-grade ore from this or a nearby locality. The high-grade ore shoot was essentially mined out in 1983. A total of 156 tons of mined ore averaged 2.8 ounces of gold per ton and 65.3 ounces of silver per ton.