Altan Nar polymetallic deposit, Bayan-Öndör District, Bayanhongor Province, Mongoliai

Regional Level Types
Altan Nar polymetallic deposit	Deposit
Bayan-Öndör District	District
Bayanhongor Province	Province
Mongolia	Country

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Altan Nar Au-polymetallic deposit by the initial drill hole (TND-09), which intersected a 55-m interval from 20 m depth with 1.02 g/t Au, 12 g/t Ag, 0.26 wt % Pb, and 0.47 wt % Zn. Subsequently, an NI 43-101-compliant mineral resource for the Altan Nar deposit was defined, with 5.0 Mt of resource (measured and indicated) at 2.0 g/t Au, 14.8 g/t Ag, 0.6 wt % Zn, and 0.6 wt % Pb, and 3.4 Mt of inferred resource at 1.7 g/t Au, 7.9 g/t Ag, 0.7 wt % Zn, and 0.7 wt % Pb.
The Ag/Au values for both the Discovery zone and Union North range from ~1 to >10. The highest gold concentrations in the Discovery zone (>20 g/t Au, capped at 50 g/t Au) are for samples with >1 wt % combined Pb and Zn, whereas samples with 0.3 to 20 g/t Au contain variable Pb and Zn values. The Pb- and Zn-rich samples at Union North (>1 wt % Pb + Zn) are more abundant than in the Discovery zone, and all samples with >5 g/t Au have >1 wt % Pb + Zn. The Ag/Au ratio for the combined Discovery zone and Union North, based on the resource calculations, is ~7.5:1, with 1.2 to 1.4 wt % Pb + Zn, although some high-grade intervals have an Ag/Au ratio close to 1:1, with Pb + Zn up to several percent.
Polymetallic mineralization is hosted by the upper member of the Ulziitkhar Formation and consists of quartz-carbonate veins and multi-stage epithermal breccias, including open-spaced infillings of zoned quartz, sphalerite, and galena with minor vugs partially infilled by finely laminated chalcedony with geopetal structures, which indicate way-up directions at the time of formation.

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.

Mineral List

23 valid minerals.

Rock Types Recorded