Anugi Prospect, Fairhaven Mining District, Northwest Arctic Borough, Alaska, USAi

Regional Level Types
Anugi Prospect	Prospect
Fairhaven Mining District	Mining District
Northwest Arctic Borough	Borough
Alaska	State
USA	Country

The Anugi Prospect is mostly in the Bendeleben quadrangle with the north-northeast portion extending into the Kotzebue quadrangle. Prospect is on NANA-owned lands. The area is underlain by permafrost.
Location: The Anuyi prospect is at an elevation of about 350 feet, approximately 5 1/2 miles south of Motherwood Point. This site is in the SW1/4 of section 13, T. 7 N., R. 17 W., of the Kanteel River Meridian. The main portion of this deposit is located just to the south southwest in the Bendeleben quadrangle.
Geology: The Anuyi prospect narrow, hematite-rich gossan that trends south-southwest for a distance of approximately 1/2 mile. The gossan is hosted predominately in black, graphitic, quartz-mica schist. Hematite cobbles are common on the surface. Hematite is also found as cement in quartz breccia. The metamorphic bedrock is considered to be early Paleozoic in age and has undergone several periods of deformation. Several rock types are present. They include quartz-mica schist, quartzite, limestone, rhyolite, and possible aplitic dikes. Soil sampling and shallowing trenching indicate that the gossan has weathered in place. Soil samples contain anomalous values of lead, zinc, antimony, arsenic, silver. and occasionally gold. The following sample values are from Williams (1991, 1992). Sample T2-20, taken from Trench 2 across the gossan, contained 14,579 ppm Pb, 737 ppm Zn, 48 ppm Ag and 60 ppm Cu. Rock sample #1328 of gossan material contained 7,264 ppm Pb, 5,243 ppm Zn, 15.6 ppm Ag and 116 ppm Cu. Sample 1374, graphitic, quartz-mica schist, contained 6,469 ppm Pb, 1,597 ppm Zn, 78.2 ppm Ag and 380 ppm Cu. On the basis of soil samples having lead values greater than 500 ppm, the mineralized area extends over 9,000 feet in a south-southwest direction with a width of 500 to 2,000 feet. The surface distribution of anomalous metal values, suggests that the deposit appears to be structurally controlled along a regional north-northeast trend. Samples from drill core contain galena and sphalerite in carbonate veins, as disseminations in schist, and as small crystals of sphalerite in open fractures. A sample of black, quartz-mica schist from trench 3 had hematite alteration along small fractures. The model for Anugi is conjectural. It may be a Paleozoic strataform massive sulfide deposit remobilized during Cretaceous intrusion and/or Tertiary volcanism; or, perhaps more likely, a Cretaceous or younger structurally-controlled deposit hosted in Paleozoic rocks.
Workings: The original discovery was made during a regional stream-sediment sampling program for NANA Regional Corp. Soil sampling has been done on a 500-foot grid over an area of approximately 3 square miles. Some select areas have been sampled on 250- and 100-foot spacing. Soil, rock and pan concentrate samples have also been collected from adjacent areas. Seven trenches were dug with a backhoe and were mapped and sampled at 5-foot intervals. VLF, magnetics and gravity surveys have been run across the deposit in several areas and six core holes were completed in 1994. An airborne magnetic survey of the area was done in 1995 by Kennecott.
Age: Mid-Paleozoic; Cretaceous or younger
Alteration: Hematite and limonite

Commodities (Major) - Ag, Pb, Zn
Development Status: None
Deposit Model: A) Paleozoic, stratiform lead-zinc deposit remobilized during Cretaceous or you

Other Databases

Link to USGS - Alaska:	KZ003

Other Regions, Features and Areas containing this locality

References